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rattling valves


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littlelo
New User

Sep 24, 2011, 2:23 PM

Post #1 of 7 (1670 views)
rattling valves Sign In

i have a 2003 mitsubishi outlander 205,000 miles i changed the headgasket and the vehicle runs well shifts well but everytime i give it gas the valves rattle loudly,could it be that i didnt change the headbolts when i put the thing back together


Hammer Time
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Sep 24, 2011, 6:34 PM

Post #2 of 7 (1641 views)
Re: rattling valves Sign In

Not changing the head bolts may cause you to have to do the job all over again but it's not causing the rattling. That sounds like an oil pressure issue. It's very risky doing the head on a car with that much mileage.



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re-tired
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Sep 24, 2011, 7:25 PM

Post #3 of 7 (1635 views)
Re: rattling valves Sign In

I sure they milled the heads during the job. This would increase the compression which may induce spark knock. Try backing up your timing a few degrees and see if it helpps.


LIFE'S SHORT GO FISH


Hammer Time
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Sep 24, 2011, 8:26 PM

Post #4 of 7 (1627 views)
Re: rattling valves Sign In

They use Crank sensors. Timing is not adjustable.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
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Sep 24, 2011, 8:38 PM

Post #5 of 7 (1623 views)
Re: rattling valves Sign In

How much they shave off the head? I believe for every .010 inch you take off, you lose a degree of valve timing on OHC engines. Of course, as RT stated you increase the compression ratio at the same time. The PCM should retard timing and make spark knock go away. Unless it is so bad, the computer can't compensate for it.

Does it rattle if you rev the engine with the transmission in park? The environment spark knock likes to reside in is higher than normal cylinder pressures when the engine is under load and/or high combustion chamber temperatures when the engine is overheating.





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(This post was edited by Discretesignals on Sep 24, 2011, 8:40 PM)


Hammer Time
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Sep 24, 2011, 8:47 PM

Post #6 of 7 (1616 views)
Re: rattling valves Sign In

I'm wondering if it even went to the machine shop at all.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Sep 25, 2011, 1:50 AM

Post #7 of 7 (1607 views)
Re: rattling valves Sign In

Man am I'm glad I only own American old cast iron!

Tom







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