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Could be lazy lifters....
Posted by Kyle [Email] (more from Kyle) on Sun, 1 Dec 2002 15:12:21
In Reply to: Front engine or valve train noises, Lalo, Sat, 30 Nov 2002 23:10:22
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The hydraulic lifters (or cam followers) can make a lot of noise if they're worn or clogged.
The lifters are supposed to maintain a cusion of oil between themselves and the washer shaped valve spring reatiners (at the top of the valve stems), so that no actual contact ever occurs between the two. Worn or clogged lifters will leak out this oil cushion at idle because of inadequate oil pressure.
The result is a rhythmic ticking noise coming from just under the valve cover that will dissapear at higher RPMs.
Try stabbing the throttle for about half a second and then listen as the engine returns to idle, if the noise dissapears momentarily and then returns, the lifters are probably your problem.
If the noise is isolated to the far left (passenger) side of the valve cover, then you may have a worn timing/balance chain or worn chain guides.
Try to isolate the location of the noise under the valve cover, this will make troubleshooting much more productive.
-Kyle
'91 9000T
148,000mi
posted by 24.60.138...
Posts in this Thread:
- Front engine or valve train noises, Lalo, Sat, 30 Nov 2002 23:10:22
- Could be lazy lifters...., Kyle, Sun, 1 Dec 2002 15:12:21 <-- Viewing This Message
- Re: Front engine or valve train noises, Bill Davies, Sun, 1 Dec 2002 13:58:54
- Re: Front engine or valve train noises, Captain Eddie Bob, Sun, 1 Dec 2002 12:37:15
- Re: Front engine or valve train noises, CalAero, Sat, 30 Nov 2002 23:26:40
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