| Re: [GMCnet] Power loss Engine rattle [message #230589] |
Wed, 20 November 2013 22:58  |
rallymaster
Messages: 662
Registered: February 2004
Location: North Plains, ORYGUN
Karma: -4
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Senior Member |
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That makes how many engines with bent or broken pushrods in the last 6
months???
And why?
RonC
On Wed, 20 Nov 2013 21:55:48 -0600 Bob de Kruyff <NEXT2POOL@AOL.COM>
writes:
>
>
> Keith V wrote on Wed, 20 November 2013 20:46
> > well we found two bent pushrods on #5
> > They are bent so bad they won't come out.
> >
> > When the push rods are spun they hit sheetmetal, like the engine
> still has the turkey tray. It was suposedly rebuilt.
> >
> > Do the heads have to come off to R&R the pushrods?
> >
> > Should the lifters be inspected or anything?
> >
> > So it looks like the intake has to come off.
>
> The big question is why they bent and both on the same cylinder. You
> can probably get them out whith the manifold off, in fact you could
> possibly force them out even with the manifold on, but you'll
> probably miss what caused it. If you remove the heads you can check
> out the valves. Are the rocker arms free on that cylinder?
> --
> Bob de Kruyff
> 78 Eleganza
> Chandler, AZ
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Ron & Linda Clark
1978 Eleganza II
North Plains, ORYGUN
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Ron & Linda Clark
North Plains, ORYGUN
78 Eleganza II
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| Re: [GMCnet] Power loss Engine rattle [message #230596 is a reply to message #230589] |
Thu, 21 November 2013 00:23  |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Senior Member |
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I think it's because the fuel does not last very long in storage anymore, and the GMCs are rarely daily drivers. The components of the fuels are also cleaning out the film on the tank walls and then we send that through the induction system after the coach sits for 3 months or more between trips. Also, these engines and valve guides were made to use leaded fuel, which was a great lubricant for valve seats AND guides. But the kids have to play in the streets next to the exhaust pipes and the rest of us don't really need to be snorkeling that stuff into our bodies either. There are some fuel additives to help, but they get expensive at 10 MPG.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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