| Broken Engine 02-06-10 [message #73058] |
Sat, 06 February 2010 12:40  |
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WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
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To keep things in order I am making a new thread. I hope that will keep eveyone on same page with this thing. I have read all of your comments. Thank you, each and every one of you, for the posts.
I am getting the requested pictures today. Even pictures of Mondello block offs. I will post them on our blog, but I am also going to put some on the GMC Photo Site. I think these are GMC related so they should be there also. Jim K. sent me an aluminum intake for the new engine. I will be cleaning the tappet covers and oil pan today for new paint. As the photo showed, there was basically no baffle in the alum. Holley valve covers.
Any questions please let me know via email or this net. Emails should have something GMC related in the titles so I don't let them slip through.
Thanks,
Dan
3 In Stainless Exhaust Headers
One Ton All Discs/Reaction Arm
355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
Holley EFI/10 Tire Air Monitoring System
Solarized Coach/Upgraded Windows
Satelite TV/On Demand Hot Water/3Way Refer
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| Re: Broken Engine 02-06-10 [message #73079 is a reply to message #73058] |
Sat, 06 February 2010 16:35  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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I'll send an email also but please take pictures of the #1 cylinder valves.
Ken
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Broken Engine 02-06-10 [message #73085 is a reply to message #73058] |
Sat, 06 February 2010 17:13 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
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Dan, is it possible that something came loose from the TB injector and got sucked into the cyl.? that could cause all the damage starting from the top side: breaking the ring land and then the ring and then the ring groove...
Fred V
'77 Royale RB 455
P'cola, Fl
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| Re: [GMCnet] Broken Engine 02-06-10 [message #73180 is a reply to message #73096] |
Sun, 07 February 2010 14:55 |
UziYaH
Messages: 282
Registered: July 2007
Location: 10-O-C
Karma: 0
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Does anyone have an idea what caused the oil pressure to drop? Could it have been metal fragments chewing up the bearings?
Howard Nylander
Royale Class of ‘78’, “Rocinante”
Greeneville, Tn.
--- On Sat, 2/6/10, Matt Colie <mcolie@chartermi.net> wrote:
From: Matt Colie <mcolie@chartermi.net>
Subject: Re: [GMCnet] Broken Engine 02-06-10
To: gmclist@temp.gmcnet.org
Date: Saturday, February 6, 2010, 7:12 PM
fred v wrote on Sat, 06 February 2010 18:13
> Dan, is it possible that something came loose from the TB injector and got sucked into the cyl.? that could cause all the damage starting from the top side: breaking the ring land and then the ring and then the ring groove...
Fred,
This is damage that I have seen from other top ring failures. If it were ingested material that broke out the top ring land there would probably be visible damage to the cylinder head right next to or to the exhaust valve. I don't see any in ..985.
Matt
--
Matt & Mary Colie
'73 Glacier 23 Chaumiere (say show-me-air)
SE Michigan
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GMCnet mailing list
List Information and Subscription Options:
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Howard Nylander
Royale Class of "78" "Rocinate"
E-10-o-C
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| Re: [GMCnet] Broken Engine 02-06-10 [message #73201 is a reply to message #73180] |
Sun, 07 February 2010 16:20 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Howard,
Matt Collie posted a long post that covered this, here's a link to another
thread regarding this subject:
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&th=10415&start=0&rid=0
Scroll down to Matt Collies post, he discusses the possible reasons for the
loss of oil pressure.
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Howard Nylander
Sent: Monday, 8 February 2010 7:55 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Broken Engine 02-06-10
Does anyone have an idea what caused the oil pressure to drop? Could it have
been metal fragments chewing up the bearings?
Howard Nylander
Royale Class of 78, Rocinante
Greeneville, Tn.
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GMCnet mailing list
List Information and Subscription Options:
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Broken Engine 02-06-10 [message #73209 is a reply to message #73201] |
Sun, 07 February 2010 17:31 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| Robert Mueller wrote on Sun, 07 February 2010 17:20 |
Howard,
Matt Colie posted a long post that covered this, here's a link to another thread regarding this subject:
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&th=10415&start=0&rid=0
Scroll down to Matt Colies post, he discusses the possible reasons for the loss of oil pressure.
Regards,
Rob Mueller
On Behalf Of Howard Nylander
Sent: Monday, 8 February 2010 7:55 AM
Does anyone have an idea what caused the oil pressure to drop? Could it have been metal fragments chewing up the bearings?
Howard Nylander
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Rob,
Thank You for pointing Howard to my explanation.
Howard,
After you read what I already wrote, here is some clarification. (You can't be the only person wondering, but you were the first to ask.)
Dan posted a nice picture of his metal flake oil pan. That means there was metallic debris for the lube oil pump to suck in.
What most people do not understand about positive displacement pumps (gear and such pumps) as are used in lubrication and hydraulic systems is that fit of the internal components must be very precise or the performance will suffer. The volume pumped is not very high, and any loss of effectiveness or efficiency will immediately effect both the maximum available discharge pressure and the output flow.
There is also a certainty that some of the debris could foul the pressure relief valve internal to the pump assembly.
Either of those two can and will cause an immediate and significant loss of lube oil pressure.
Though there is possible bearing damage, this is not a given as there is the chance that much of the debris got trapped in the filter.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Broken Engine 02-06-10 [message #73279 is a reply to message #73276] |
Mon, 08 February 2010 13:58 |
Smitty52
Messages: 181
Registered: July 2007
Karma: 0
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Senior Member |
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Dan,
Are there plans to run in your new engine on the stand before putting it in the coach? Do they run them long enough to seat in the new cam and lifters or just long enough to make sure they work correctly? Not being familiar with the break in for an Olds engine (can it really be any different?) all I know is that when I run in a "new" AMC engine, I run it at 2000rpm for a little over 20 minutes as a break in for the cam. Is that what Miguel does on the stand? Just curious.
Thanks
Wayne
Wayne and Lisa,
Bolton Landing, NY,
Patriot Guard Rider,
Standing for those who stood for us.
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Dan could it be possible after watching BURN OUT that you tried it. Just wondering.Jack