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Re: [GMCnet] Found engine knock [message #250174]

Tue, 20 May 2014 00:52

<rallymaster

Messages: 361
Registered: May 2014

Karma: 2

Senior Member

Hmmm, is that 4 broken or bent pushrods in the last few months?
How many does it take to be an epidemic?

RonC

On Mon, 19 May 2014 21:41:52 -0600 Jerry Sitzlar
writes:
> My guess is a bent/stuck/warped valve with the push rod being the
> weakest link when something had to give, it may have broke. Just a
> guess. :(
> --
> Jerry Sitzlar....77 Eleganza II .....Lenoir City, TN
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Ron & Linda Clark
1978 Eleganza II
North Plains, ORYGUN

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Re: [GMCnet] Found engine knock [message #250190 is a reply to message #250174]

Tue, 20 May 2014 12:16

roy1

Messages: 2126
Registered: July 2004
Location: Minden nevada

Karma: 6

Senior Member

What could be causing them too bend? Are they original push rods and not an inferior substitute ? Are the springs stiffer then stock? I doubt you are experience ing valve float at the low rpm we run. Does the engine backfire badly before they bend? Are the rockers and stanchions stock? Did you check the lifter preload to be sure there is no binding? Higher strength push rods can be bought from places like Summit but the stock ones should be fine. Just a few things I can think of that could cause a bent push rod besides sticking valves.

Roy Keen Minden,NV 76 X Glenbrook

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