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Old January 9th 06, 03:46 AM posted to alt.autos.gm,rec.autos.tech
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Default S10 2.2 lifter noise?


"Bob Urz" > wrote in message
...
>
>
> sdlomi2 wrote:
>
>> "BOB URZ" > wrote in message
>> ...
>>
>>>I had previously posted last year on the problems i had with my
>>>96 2.2 Chevy S10. To recap, the tensioner on the cam chain broke
>>>and allowed the chain to jump time. I took the head off and found
>>>8 bent valves. I had the head into a machine shop, had it cleaned,
>>>decked, and 8 new valves and seals put in it. I had someone else
>>>put the head back on at the time. The truck started and ran OK
>>>after all this.
>>>
>>>Now, here's my issue. At About 3000 RPM+ or so i hear what appears to be
>>>lifter noise from the engine. I cannot really detect
>>>it at lower RPM's. And i can raise the throttle in park to this point
>>>and hear the noise also.
>>>
>>>So, my question now is what this noise could be? I did not remember
>>>hearing it before all this happened. My thoughts are maybe:
>>>A lifter mount not properly screwed down? Bent push rods maybe?
>>>I know this engine had piston slap issues and i heard them before
>>>this happened. But it really does not seem to be the same noise.
>>>Any thoughts? What would be the result of a bent push rod?
>>>
>>>
>>>Bob

>>
>>
>> Get a mech to listen & check for rod-bearing noise. s

> Its coming from the top end. I know what pre detonation noise is
> and its not that. And its peaky like a resonance only above a certain
> RPM. It almost sounds like something loose sympathetically vibrating,
> but i a fairly sure its somehow valve train related. Ir does not have
> that lower sound of lower end rod/bearing noise.
>
> Back to the original questions:
> If the push rods were slightly bent, what kinds of symptoms or noise
> If the rocker arm nuts were slightly loose?


I think if any of these conditions exist, there would be valve lifter
noise, and it seems as if it would be loudest when oil pressure was
lowest--at idle? Don't believe it'd be loudest at 3k rpm, as oil pressure
should be relatively high there. s


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