Home » Public Forums » GMCnet » Re: [GMCnet] Transmission vacuum modulator leaking?
| Re: [GMCnet] Question [message #327496 is a reply to message #327464] |
Tue, 26 December 2017 08:25   |
GMC.LES
Messages: 505
Registered: April 2014
Karma: -2
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Gordon,
Did you try contacting Marcus?
I recall that he may of had a set of heads available, fully rebuilt, just needing re-assembly. He may have sold them though. Worth a try if you need them.
Les Burt
Montreal
'75 Eleganza 26'
> On Dec 24, 2017, at 7:56 PM, Matt Colie wrote:
>
> gibsongo wrote on Sun, 24 December 2017 13:31
>> Mike, thanks for the offer but I have to get this taken care of sooner rather than later. So far I haven't gotten any nasty notes through the
>> door, but a visit from the local constabulary informing me of my violation of municipal regulations can't be too far off.... Matt - my guestimate
>> diagnosis matches yours - I missed your string from this summer about the same subject but found it doing a search of this site on cylinder heads.
>> What did you end up doing finally - engine out or just the heads? And what did you end up finding?
>>
>> I've found a garage with big bays about 40 miles away that will accommodate me, and am booked in on January 3rd. I've got my fingers crossed
>> hoping for a head gasket problem rather than a cracked head. Just in case I've been looking around for "J" heads, but haven't located any so far.
>> Hopefully I won't need them.......
>>
>> Merry Christmas to you all!
>
> Gordon,
>
> I don't have mine open yet. There were other demands on my time and after talking to Dave Lenzi I decided to pull the front frame out the front. I
> have enough room to do that. I could have pulled it out the top. As with a 23, that is not so tough. But the refit of the front dress sounds a
> whole lot like a "ship in a bottle" that I don't have the patience for. I did manage to acquire access to both a pair of G and a pair of J heads.
> (They were still bolted to engines. Part of my hold up.) Both of which look good to a visual inspection. (My visual inspections are pretty good, but
> can't beat magnetic particle.) I am hoping to pull the frame out just after the new year.
>
> Keep us posted..
>
> 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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| Re: [GMCnet] Question [message #327516 is a reply to message #327496] |
Tue, 26 December 2017 21:43 |
gibsongo
Messages: 116
Registered: October 2012
Location: Montreal West, Quebec, Ca...
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Les
Marcus??? Memory failing because of advancing age, but is this the guy in Rochester you referred me to about a year ago. If so, I did meet with him, bought two gas tanks from him that we removed from a coach parked in a field, as well as a set of Alcoas.
Really nice guy and I really appreciated the referral - if I have it right, please let me know and I will be in touch with him right away....
Much thanks
Gordon
Gordon Gibson
1976 23" Norris Upfit
Montreal West, Quebec, Canada
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| Re: [GMCnet] Question [message #327517 is a reply to message #327516] |
Tue, 26 December 2017 22:30 |
GMC.LES
Messages: 505
Registered: April 2014
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Gordon,
Yes. Marcus McGee in Rochester.
I have no idea what he has remaining in engine parts now. I do know that a while back he did have some heads, cranks, Rods, etc. Most of it had been cleaned, magnafluxed, and reworked, ready to re-assemble. He had some of it listed on eBay, but I can't recall what sold. Might be worth the phone call to check.
Les Burt
Montreal
'75 Eleganza 26'
> On Dec 26, 2017, at 10:43 PM, Gordon Gibson wrote:
>
> Les
>
> Marcus??? Memory failing because of advancing age, but is this the guy in Rochester you referred me to about a year ago. If so, I did meet with
> him, bought two gas tanks from him that we removed from a coach parked in a field, as well as a set of Alcoas.
>
> Really nice guy and I really appreciated the referral - if I have it right, please let me know and I will be in touch with him right away....
>
> Much thanks
>
> Gordon
> --
> Gordon Gibson
> 1976 23" Norris Upfit
> Montreal West, Quebec, Canada
>
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| Re: [GMCnet] Transmission vacuum modulator leaking? [message #329189 is a reply to message #326961] |
Thu, 15 February 2018 20:12 |
gibsongo
Messages: 116
Registered: October 2012
Location: Montreal West, Quebec, Ca...
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So the verdict is in - hairline crack in the left cylinder head (#3) between the intake and exhaust valves. I guess the big question is why? Engine rebuilt 10,000 km ago (new rings , bearings, timing chain, etc., heads done but not magnafluxed) Really sweet running mill, burned less than a 1 quart of oil over the 10K km. I did experience a stuck thermostat at 2,500 KM, but thought I caught it quick enough before the digital temp reading exceeded 225....and it ran without a hiccup for 7,500 km afterwards,
Matt mentioned short cycles in cold weather, and it was below 0 centigrade when I started it up and saw a puff of white smoke for the first time. But I'd done a bunch of driving in Northern Alberta at the 5,000 KM mark in -10C with no problems - driving another 5,000 problem-free kms after that. And surely lots of Toronados got driven to the grocery store in the dead of winter....
Frank Borrmann has some J heads. We are going to magnaflux one before doing the machining just in case, as well as doing the same for my "good" head and my manifold before reassembling just to be safe.
If anyone has ideas on what should NOT be done to avoid a repeat, I'd love to hear them.
Gordon Gibson
1976 23" Norris Upfit
Montreal West, Quebec, Canada
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| Re: [GMCnet] Transmission vacuum modulator leaking? [message #329192 is a reply to message #329189] |
Thu, 15 February 2018 21:13 |
James Hupy
Messages: 6806
Registered: May 2010
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Don't use 40 year old heat cycled castings. This stuff is ageing out.
Careful inspection and Magnaflux are your friends. Cautious torque
procedure all help. Luck figures in there, too I think.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Feb 15, 2018 6:12 PM, "Gordon Gibson" wrote:
> So the verdict is in - hairline crack in the left cylinder head (#3)
> between the intake and exhaust valves. I guess the big question is why?
> Engine
> rebuilt 10,000 km ago (new rings , bearings, timing chain, etc., heads
> done but not magnafluxed) Really sweet running mill, burned less than a 1
> quart of oil over the 10K km. I did experience a stuck thermostat at
> 2,500 KM, but thought I caught it quick enough before the digital temp
> reading
> exceeded 225....and it ran without a hiccup for 7,500 km afterwards,
>
> Matt mentioned short cycles in cold weather, and it was below 0 centigrade
> when I started it up and saw a puff of white smoke for the first time. But
> I'd done a bunch of driving in Northern Alberta at the 5,000 KM mark in
> -10C with no problems - driving another 5,000 problem-free kms after that.
> And surely lots of Toronados got driven to the grocery store in the dead
> of winter....
>
> Frank Borrmann has some J heads. We are going to magnaflux one before
> doing the machining just in case, as well as doing the same for my "good"
> head
> and my manifold before reassembling just to be safe.
>
> If anyone has ideas on what should NOT be done to avoid a repeat, I'd
> love to hear them.
> --
> Gordon Gibson
> 1976 23" Norris Upfit
> Montreal West, Quebec, Canada
>
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| Re: [GMCnet] Transmission vacuum modulator leaking? [message #329221 is a reply to message #326961] |
Fri, 16 February 2018 20:54 |
gibsongo
Messages: 116
Registered: October 2012
Location: Montreal West, Quebec, Ca...
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James - proper torque certainly makes good sense, but I'm not sure I understand the comment about avoiding heat-cycled castings. Any used head is going to have experienced lots of "heat up to operating temp. - cool down" cycles. Are you suggesting using new aluminum heads? Does anyone have experience - positive or negative - with these?
Gordon Gibson
1976 23" Norris Upfit
Montreal West, Quebec, Canada
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| Re: [GMCnet] Transmission vacuum modulator leaking? [message #329222 is a reply to message #329221] |
Fri, 16 February 2018 21:18 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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No I was just stating what should be obvious. These engines are 40 years
old, they have been "rode hard and put away wet" to coin an old phrase. If
you have a choice and know the history of the heads you intend to use, then
the fewer heat/cool cycles they have experienced, the better for you. All
we can do is the best we can. No guarantee about cracks, the previous
history of the heads is largely unknown.
Jim Hupy
On Feb 16, 2018 6:55 PM, "Gordon Gibson" wrote:
> James - proper torque certainly makes good sense, but I'm not sure I
> understand the comment about avoiding heat-cycled castings. Any used head
> is
> going to have experienced lots of "heat up to operating temp. - cool down"
> cycles. Are you suggesting using new aluminum heads? Does anyone have
> experience - positive or negative - with these?
> --
> Gordon Gibson
> 1976 23" Norris Upfit
> Montreal West, Quebec, Canada
>
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