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top end engine knock!!!


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Posted

hey guys

i started my lumina for first time all winter today, its been in underground storage all winter long. im a little concerned though. im hearing a knock coming from the vavle train, only when you rev the engine up. Sounds similiar to the knock a rod bearing would make only its definetly coming from the front bank valvetrain.

 

im curious about cam bearings in the dual ohc engines. Are they a common problem?? difficult to change??? any info or ideas on what may be the problem would be greatly appreciated. thanks

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Posted

hey guys

i started my lumina for first time all winter today, its been in underground storage all winter long. im a little concerned though. im hearing a knock coming from the vavle train, only when you rev the engine up. Sounds similiar to the knock a rod bearing would make only its definetly coming from the front bank valvetrain.

 

im curious about cam bearings in the dual ohc engines. Are they a common problem?? difficult to change??? any info or ideas on what may be the problem would be greatly appreciated. thanks

If it sat all winter, the oil is probbaly right all in the pan, everything would be unlubed. How long did you let it run for? Shouldn't be a knock, moreso a tick.

  • 1 year later...
Posted

I just started haveing this same problem with mine only i have been driving it pretty much everyday

 

it is over due for an oil change though but could that cause this problem?

Posted

Resolone isnt an additive its more of a detergent designed specifically to quiet valvetrain noise.

 

 

Posted

I'd let it warm up to operating temp and see if the noise goes away. One of the lifters has probably lost its prime.

 

Whereabouts are you in Kitchener?

Posted

and i have let it run up to temp and it still makes the noise but only when i step on the gas

Posted

Any Auto parts store its about $6.00 a a quart follow the instructions on the bottle.

 

 

 

 

Posted

and i have let it run up to temp and it still makes the noise but only when i step on the gas

 

I was responding to the original thread question.

Posted

drain the oil, put in 5 quarts 5w30 synthetic and a bottle of CD2 valvetrain noise stuff. Patgizz swears by royal purple, I'm a fan of syntec.

Posted

they changed formula, i read it doesnt hold up as well as it used to, been a while since I read up on it.

Posted

Remove the serpentine belt, this will isolate w/pump,power strg pump, etc. and listen for any change. Could be a something other than engine noise. Good luck

 

Joel

Posted

the sound is comming from the opposite side of the engine its on the drivers side front bank of the heads

 

least that what it sounds like

Posted

You can spend all day guessing what the noise is. You can try many many weight oils and that may not even cure the problem. I suggest you go into the engine and find out whats causing it.

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