| Maintenance question [message #112636] |
Fri, 21 January 2011 21:48  |
thorndike
Messages: 406
Registered: January 2011
Location: Conifer, Colorado
Karma: 0
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Senior Member |
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Hello folks,
I am looking at a coach ('76) that has a spotless interior. I have been reviewing the maintenance records and have noticed that every 4 years or so, the manifolds were resurfaced and had a new gasket installed. Eventually, the records show that the manifolds were too thin to resurface and just had a gasket installed.
I can't figure out what would cause the manifold gaskets to be replaced so often. Any thoughts?
Bob
EDIT: Had the wrong coach in mind when I wrote this. The coach is a '76 with a side wet bath with twins in the back.
Robert Peesel
1976 Royale 26'
Side Dry Bath
Conifer, Colorado
[Updated on: Fri, 21 January 2011 22:35] Report message to a moderator |
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| Re: [GMCnet] Maintenance question [message #112639 is a reply to message #112636] |
Fri, 21 January 2011 22:00  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Same bad manifold. Won't hold a gasket due to not enough material on the
manifold itself, or the head is uneven (very likely). The fix could be as
simple as remflex exhaust gaskets for manifolds, or remove the head(s) and
resurface them as well. The manifold bolts need to be retightened after
original heating and cooling cycle following gasket replacement in any case
except for remflex. They have a very specific torque proceedure. I assume
that the engine is a 403 unless it has been changed. If the manifold is bad
and the heads are good, Thorley headers are a possibility also.
Jim Hupy
Salem, Or
78 GMC Royale 403
On Fri, Jan 21, 2011 at 7:48 PM, Robert Peesel <thorndike@pldsllc.com>wrote:
>
>
> Hello folks,
>
> I am looking at a coach ('78 Royale) that has a spotless interior. I have
> been reviewing the maintenance records and have noticed that every 4 years
> or so, the manifolds were resurfaced and had a new gasket installed.
> Eventually, the records show that the manifolds were too thin to resurface
> and just had a gasket installed.
>
> I can't figure out what would cause the manifold gaskets to be replaced so
> often. Any thoughts?
>
> Bob
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
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>
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