Home » Public Forums » GMCnet » Can I shoot the PPO?
| Can I shoot the PPO? [message #340940] |
Tue, 12 February 2019 10:55  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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I can't blame Neil, he always had Miguel fix whatever, and the fixes hold. But, his PO was a case. I'm still finding stuff. Removing the lunched engine has shown me many more. Once I lift it out, there's at least two days of cleanup and removal of not needed wires and brackets and chit. Then I'm gonna spray it down with Simple Green - since mineral spirits seem to be a nono any more - and hose it off. At least then future forays underneath won't be quite so oily/greasy as they are now.
I've another for the engine gurus though, since this is the first one I managed to shut down still running - albeit sans oil pressure and a nasty increasing metallic knock. I cleaned out the accessories yesterday, and now I find a quarter inch of end play on the crankshaft. I cut the oil filter open, it had copper chaff in the inside fold of the pleats, not a great amount. No steel or aluminum. So I figure the copper is a failed or failing bearing. But - a) where di all that endplay come from; and b) did it increase to the point it failed a rod bearing which then came apart? Disassembly may be revealing but iff'n it isn't, why did the thing fail?
Inquiring minds wonder
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Can I shoot the PPO? [message #340944 is a reply to message #340940] |
Tue, 12 February 2019 14:41  |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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When my thrust bearing failed I attributed it to an extremely hard shifting transmisson while upshifting after climbing a steep grade.I had manny go thru the trans and remove the nasty shift kit and kick down solenoid while I had the engine apart.
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] Can I shoot the PPO? [message #340947 is a reply to message #340945] |
Tue, 12 February 2019 16:37 |
gmc-email-list
Messages: 124
Registered: February 2019
Karma: 2
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Which effectively neutralizes the popular "ballooning torque converter"
myth. When I burned up two thrust bearings in the Cad500's, I did a lot of
research trying to find a rational cause. If there's any truth to the
"ballooning" myth, it's not an expanding TC, but a "flying balloon". That
is, if the difference in the effective area on the front of the TC is about
1-1/2 sq.in. greater than that on the rear, then a 100 psi hydraulic
pressure can create a 150 lbf forward on the crankshaft. Somewhere, IIRC,
I saw that the Chevy big block is designed to withstand 280 lbf -- I've
never seen even a guess for any other engine.
Knowing that the Cad500 is/was popular with air boaters, I got in touch
with an air boat builder. He said that most get away with direct drive
without any upgrade, but he adds a brass thrust washer to the #1 main. He
offered to send the material to upgrade mine, but I declined -- it SHOULD
NOT be necessary.
Since I never found a reason for the failure in my completely rebuilt
Cad500 or the immediate failure after the repair, I gave up on the whole
thing -- I replaced the engine, the torque converter and the transmission.
After about 50,000 miles on the "refreshed" engine, I've had no more
trouble. I tend to blame the torque converter (rebuilt by a local, 50
years in business, company), but I never had them tear down and inspect
it. Manny rebuilt the transmission during one of his visits and found
nothing suspicious in it.
So, I'm of no help in figuring out why thrust bearings fail.
Ken H.
On Tue, Feb 12, 2019 at 5:18 PM James Hupy via Gmclist <
gmclist@list.gmcnet.org> wrote:
> My transmission guy calls B.S. on thrust transmitted through the torque
> converter. There is at least a 1/2" of movement possible back and forth on
> the lugs of the converter.
> Jim Hupy
>
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| Re: [GMCnet] Can I shoot the PPO? [message #340957 is a reply to message #340947] |
Tue, 12 February 2019 23:00 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Thrust bearing failure can be caused by:
1) Improper or warped flex plate
2) Improper torque converter for application
3) Accessories on front of engine not aligned properly or wrong pulleys used
4) Distorted connecting rods
5) constant pressure on clutch in manual transmission scenarios
I'm sure there are other pathways to thrust bearing failure, these are just the varieties I have come across.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: Can I shoot the PPO? [message #340991 is a reply to message #340940] |
Wed, 13 February 2019 17:00 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Well, the A/C belt was broken and caught between the fan and fan pulley. I don't see that as causing such havoc. The back two belts were fine. It's ready to lift out now anyways. Alls I need is a couple of cousins to help me left the trolley beam in place. No way can I one - hand it. Once in, I think I can one - hand the engine.
More surprises as I go. Mights well to fix all of them while there's room and access.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Can I shoot the PPO? [message #340996 is a reply to message #340991] |
Wed, 13 February 2019 17:38 |
gmc-email-list
Messages: 124
Registered: February 2019
Karma: 2
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I have broken 2 sets of belts on the same water pump. Both of them I shut
down really quickly and replaced the belts alongside the road. Months
later, the water pump bearings failed just driving down a straight freeway.
Did the previous belt failures and tangles cause the bearings to fail, or
was it just the thousands of miles of use, normal wear and tear? I cannot
really say. But, a spare water pump on board would have saved me the cost
of a tow and Judy's birthday spent overnight in a tow truck yard. Still
paying for that one. (Grin)
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Wed, Feb 13, 2019, 3:12 PM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org wrote:
> Well, the A/C belt was broken and caught between the fan and fan pulley.
> I don't see that as causing such havoc. The back two belts were fine. It's
> ready to lift out now anyways. Alls I need is a couple of cousins to help
> me left the trolley beam in place. No way can I one - hand it. Once in, I
> think I can one - hand the engine.
>
> More surprises as I go. Mights well to fix all of them while there's room
> and access.
>
> --johnny
>
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me
> in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| was can I shoot the PPO, now top swap [message #341125 is a reply to message #340940] |
Tue, 19 February 2019 09:56 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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I got the trolley set up - Tom Sawyered a cousin - and now I have to tighten the trolley runner enough to hold the chain fall hook up so the engine will clear. Chuck has a tall chain fall, and my little one hasn't sufficient capacity. So, I took the nut off one end for my pattern. Lowe's - who give me ten off - is in the process of dumping Kobalt in favor of Craftsman. Which I assume the bought. Anyway nothing that big. Tractor Supply will have it but offers no discount. So I stopped at Freight, Harbor. For 90 bux they have a kit of four combination wrenches, one of which will fit. Three of which I have no current or projected use for. But, their next to biggest adjustable wrench at 20 bux fits it. So, I got a BIG adjustable wrench now. Soon as it stops raining, out she comes.
Someone - Emery maybe?- said you can come out the top without removing the interior fittings between the hatch and the door. I'd admire to see it done, but since I just blew in nearly two Large on reupholstery, I'll leave the stuff in my shop till the new engine is in.
And I have a wonder for the experienced. I'm putting veneer flooring in below the steps - snap together. Can I leave the carpet under it for sound deadening? It isn't wrinkled or torn, merely scurvy from many years of stains. Y&all's thoughts?
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
[Updated on: Tue, 19 February 2019 09:58] Report message to a moderator |
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| Re: [GMCnet] was can I shoot the PPO, now top swap [message #341126 is a reply to message #341125] |
Tue, 19 February 2019 10:42 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Johnny,
Not only do I figure the carpet is too thick for a veneer's pad, probably
causing joint cracks, but I'd hate to have the carpet in there, get wet,
mildew on top of all that old dirt, and begin to STINK!
JMHO,
Ken H.
On Tue, Feb 19, 2019 at 11:03 AM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I got the trolley set up - Tom Sawyered a cousin - and now I have to
> tighten the trolley runner enough to hold the chain fall hook up so the
> engine
> will clear. Chuck has a tall chain fall, and my little one hjasn't
> sufficient capacity. So, I took the nut off one end for my pattern.
> Lowe's - who
> give me ten off - is in the process of dumping Kobalt in favor of
> Craftsman. Which I assume the bought. Anyway nothing that big. Tractor
> Supply
> will have it but offers no discount. So I stopped at Freight, Harbor.
> For 90 bux they have a kit of four combination wrenches, one of which will
> fit. Three of which I have no current or projected use for. But, their
> next to biggest adjustable wrench at 30 bux fits it. So, I got a BIG
> adjustible wrench now. Soon as it stops raining, out she comes.
> Someone - Emery maybe?- said you can come out the top without removing the
> interior fittings between the hatch and the door. I'd admire to see it
> done, but since I just blew in nearly two Large on reupholstery, I'll
> leave the stuff in my shop till the new engine is in.
> And I have a wonder for the experienced. I'm putting veneer flooring in
> below the steps - snap together. Can I leave the carpet under it for spund
> deadening? It isn't wrinkled or torn, merely scurvy from many years of
> stains. Y&all's thoughts?
>
> --johnny
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me
> in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] was can I shoot the PPO, now top swap [message #341128 is a reply to message #341126] |
Tue, 19 February 2019 11:11 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Remove the carpeting. You new floor would flex on it and eventually self-destruct. Paint your wooden floor with Kiltz before you install the new floor.
On removing the engine, remove the driver and passenger seat. Really makes it easier.
See you in Tallashaee.
Tom
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] was can I shoot the PPO, now top swap [message #341132 is a reply to message #341128] |
Tue, 19 February 2019 11:49 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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When I removed my engine with a trolley I did not remove the front seats, nor the dinette seats nor the couch. I draped plastic sheets over everything to keep any grease or dirt off and also laid sheets over the carpet.
I had plenty of room for the engine and saved a lot of time by not having to remove furniture.
I did purchase an engine load leveler from Harbor Freight which fits on the engine and attaches to the lift chain. https://m.harborfreight.com/3-4-quarter-ton-capacity-heavy-duty-load-leveler-67441.html
This allows one to tilt the engine and makes it easier to pull it up through the box opening. I had borrowed the trolley from the GMC Mountaires so I donated the leveler attachment to the club when I was done with it.
I see that you recommended using Kiltz paint. It is actually Kilz, readily available at Home Depot and about any paint store. It is a latex based primer meant to seal stains and odors. When my daughter pulled up smelly carpet in a used house they bought they discovered cat urine under carpet in every room with carpet. Bedrooms, bathrooms and even the living room. Kilz did kill the odor as advertised.
Emery Stora
77 Kingsley
Frederick, CO
> On Feb 19, 2019, at 10:11 AM, Thomas Phipps via Gmclist wrote:
>
> Remove the carpeting. You new floor would flex on it and eventually self-destruct. Paint your wooden floor with Kiltz before you install the new
> floor.
> On removing the engine, remove the driver and passenger seat. Really makes it easier.
> See you in Tallashaee.
> Tom
> --
> 2012 Phoenix Cruiser
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| Re: [GMCnet] Can I shoot the PPO? [message #341145 is a reply to message #341144] |
Wed, 20 February 2019 00:14 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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There are thrust bearings now that allow oil to weep out and avoid keeping
oil there to get so hot it cannot cushion.
I have diagrams if your interested.
Problem is that most machine shops think they know it all.
On Tue, Feb 19, 2019 at 8:02 PM Larry via Gmclist
wrote:
> IMO, many of the thrust failures are a result of improper install of the
> half shells of the thrust mains during a rebuild. It may not seem like it
> but there is often a little slop between the main thrust shells and the
> block main were the shells sit. You must place the shells in the block and
> the
> main bearing caps. Then set the crank in the block mains. Put the main
> caps on and finger tighten the bolts. pull the thrust main bearing bolts to
> a
> light tug...maybe 10ft lbs or so. Then take a dead blow hammer (Do NOT use
> a steel hammer for this) and strike the rear of the crank several times.
> This will shove the two caps (the one in the block and the one in the
> thrust main cap) forward so that the two half shells of the thrust are
> aligned
> with each other. Then tighten the bolts to specified torque. If you don't
> do this, you run the risk that if the half shells are not perfectly flush
> with each other, when the crank moves forward (as it naturally will
> because of the .002 to .012 spec'd clearance) the crank thrust surface
> will only
> be contact one of the half shells, starting the wear process. Once started
> the worn particles will quickly take out the thrust. JWIT
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
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> Unsubscribe or Change List Options:
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Can I shoot the PPO? [message #341147 is a reply to message #341144] |
Wed, 20 February 2019 05:32 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Larry,
Misalignment of the thrust main bearings was DEFINITELY not the reason for
either of the two failures I had in quick succession. I was aware of that
necessity, and very careful to satisfy it.
Ken H.
On Tue, Feb 19, 2019 at 11:02 PM Larry via Gmclist
wrote:
> IMO, many of the thrust failures are a result of improper install of the
> half shells of the thrust mains during a rebuild. It may not seem like it
> but there is often a little slop between the main thrust shells and the
> block main were the shells sit. You must place the shells in the block and
> the
> main bearing caps. Then set the crank in the block mains. Put the main
> caps on and finger tighten the bolts. pull the thrust main bearing bolts to
> a
> light tug...maybe 10ft lbs or so. Then take a dead blow hammer (Do NOT use
> a steel hammer for this) and strike the rear of the crank several times.
> This will shove the two caps (the one in the block and the one in the
> thrust main cap) forward so that the two half shells of the thrust are
> aligned
> with each other. Then tighten the bolts to specified torque. If you don't
> do this, you run the risk that if the half shells are not perfectly flush
> with each other, when the crank moves forward (as it naturally will
> because of the .002 to .012 spec'd clearance) the crank thrust surface
> will only
> be contact one of the half shells, starting the wear process. Once started
> the worn particles will quickly take out the thrust. JWIT
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Can I shoot the PPO? [message #341149 is a reply to message #341147] |
Wed, 20 February 2019 06:49 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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OH Ken,
Hope you don't think I was critical of your build. You and I talked about this and I know that you did this procedure right. I posted the comment to make others aware of the potential problem. Sorry for the implication. Surely not intended.
Ken Henderson wrote on Wed, 20 February 2019 05:32Larry,
Misalignment of the thrust main bearings was DEFINITELY not the reason for
either of the two failures I had in quick succession. I was aware of that
necessity, and very careful to satisfy it.
Ken H.
On Tue, Feb 19, 2019 at 11:02 PM Larry via Gmclist
wrote:
> IMO, many of the thrust failures are a result of improper install of the
> half shells of the thrust mains during a rebuild. It may not seem like it
> but there is often a little slop between the main thrust shells and the
> block main were the shells sit. You must place the shells in the block and
> the
> main bearing caps. Then set the crank in the block mains. Put the main
> caps on and finger tighten the bolts. pull the thrust main bearing bolts to
> a
> light tug...maybe 10ft lbs or so. Then take a dead blow hammer (Do NOT use
> a steel hammer for this) and strike the rear of the crank several times.
> This will shove the two caps (the one in the block and the one in the
> thrust main cap) forward so that the two half shells of the thrust are
> aligned
> with each other. Then tighten the bolts to specified torque. If you don't
> do this, you run the risk that if the half shells are not perfectly flush
> with each other, when the crank moves forward (as it naturally will
> because of the .002 to .012 spec'd clearance) the crank thrust surface
> will only
> be contact one of the half shells, starting the wear process. Once started
> the worn particles will quickly take out the thrust. JWIT
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Can I shoot the PPO? [message #341152 is a reply to message #341149] |
Wed, 20 February 2019 07:57 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Larry,
No, I didn't take your posting personally at all -- I just wanted to be
sure everyone understands that there are still other -- often unknown --
reasons for the failures.
Ken H.
On Wed, Feb 20, 2019 at 8:04 AM Larry via Gmclist
wrote:
> OH Ken,
> Hope you don't think I was critical of your build. You and I talked about
> this and I know that you did this procedure right. I posted the comment to
> make others aware of the potential problem. Sorry for the implication.
> Surely not intended.
>
>
> Ken Henderson wrote on Wed, 20 February 2019 05:32
>> Larry,
>>
>> Misalignment of the thrust main bearings was DEFINITELY not the reason
> for
>> either of the two failures I had in quick succession. I was aware of
> that
>> necessity, and very careful to satisfy it.
>>
>> Ken H.
>>
>> On Tue, Feb 19, 2019 at 11:02 PM Larry via Gmclist
>> wrote:
>>
>>> IMO, many of the thrust failures are a result of improper install of
> the
>>> half shells of the thrust mains during a rebuild. It may not seem
> like it
>>> but there is often a little slop between the main thrust shells and
> the
>>> block main were the shells sit. You must place the shells in the
> block and
>>> the
>>> main bearing caps. Then set the crank in the block mains. Put the main
>>> caps on and finger tighten the bolts. pull the thrust main bearing
> bolts to
>>> a
>>> light tug...maybe 10ft lbs or so. Then take a dead blow hammer (Do
> NOT use
>>> a steel hammer for this) and strike the rear of the crank several
> times.
>>> This will shove the two caps (the one in the block and the one in the
>>> thrust main cap) forward so that the two half shells of the thrust are
>>> aligned
>>> with each other. Then tighten the bolts to specified torque. If you
> don't
>>> do this, you run the risk that if the half shells are not perfectly
> flush
>>> with each other, when the crank moves forward (as it naturally will
>>> because of the .002 to .012 spec'd clearance) the crank thrust
> surface
>>> will only
>>> be contact one of the half shells, starting the wear process. Once
> started
>>> the worn particles will quickly take out the thrust. JWIT
>>> --
>>> Larry
>>> 78 Royale w/500 Caddy
>>> Menomonie, WI.
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> GMCnet mailing list
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Thrust Bearing "Can I shoot the PPO?" [message #341154 is a reply to message #341151] |
Wed, 20 February 2019 08:46 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Also the surfaces are ramped so oil film will build up as the crank rotates.
Lot of tests were conducted on this by main bearing Mfg co as they were
aware of this problem.I experienced it 4 times back in 1990's and learned a
lot as well in2000 when we started replacing 20-30 engines a year at our
shop.
Crank grinders as a rule do not touch the thrust bearing area as they do
not have the tooling to do it correctly and polish that surface to a mirror
like finish.
On Wed, Feb 20, 2019 at 6:19 AM Matt Colie via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Because I missed a number, I ended up buying several sets of main
> bearings. (Good story, but you have to buy the beer to hear it.) Two of
> the sets
> had the Dick Paterson recommended improved oil groves. One set did not.
> So, this is something that should be checked at assembly.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
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Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Thrust Bearing "Can I shoot the PPO?" [message #341156 is a reply to message #341154] |
Wed, 20 February 2019 09:40 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
|
Senior Member |
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I really hate to get involved in the great thrust debate. I kinda agree
with most of the viewpoints. But, those damn failures continue. I was
taught the thrust bearing settling procedure very early on in my career.
Engine failures from excessive thrust really started to rear their ugly
heads with high revving small block chev engines with heavy duty clutches
and 4 speed transmissions. All that end play is not a good thing. But,
Automatic transmissions with torque converters eliminated the thrust loads.
So, we need to look for other causes. Assembly accounts for some
failures, POOR BEARING MANUFACTURE IS VERY HIGH ON MY LIST OF SUSPICIONS.
No start up lube, or wrong lube on assembly is also high on my list, as is
poor break-in procedures. Lack of zinc and phosphorus additives in modern
oils is ALWAYS stated as a cause by engine builders like S and J.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Wed, Feb 20, 2019, 7:17 AM Jim Kanomata via Gmclist <
gmclist@list.gmcnet.org wrote:
> Also the surfaces are ramped so oil film will build up as the crank
> rotates.
> Lot of tests were conducted on this by main bearing Mfg co as they were
> aware of this problem.I experienced it 4 times back in 1990's and learned a
> lot as well in2000 when we started replacing 20-30 engines a year at our
> shop.
> Crank grinders as a rule do not touch the thrust bearing area as they do
> not have the tooling to do it correctly and polish that surface to a mirror
> like finish.
>
> On Wed, Feb 20, 2019 at 6:19 AM Matt Colie via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> Because I missed a number, I ended up buying several sets of main
>> bearings. (Good story, but you have to buy the beer to hear it.) Two of
>> the sets
>> had the Dick Paterson recommended improved oil groves. One set did not.
>> So, this is something that should be checked at assembly.
>>
>> Matt
>> --
>> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
>> Electronically Controlled Quiet Engine Cooling Fan
>> OE Rear Drum Brakes with Applied Control Arms
>> SE Michigan - Twixt A2 and Detroit
>>
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> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
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> Unsubscribe or Change List Options:
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