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Registered
Join Date: Oct 2003
Posts: 3,019
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Valvetrain noise question
Is there any reason why an SC would have noisy valves, even when the clearances are correctly adjusted? I am asking because I’ve set my valves twice now, thinking they were loose because of how noisy they are, and now have just had my mechanic go over them once more yet they are still noisier than I would like. They sound good when cold but once the engines warmed up they seem very loud- positively nosier than most SC’s I’ve heard. Some seem noisier than others- ie. The passenger side intake valves are louder than the driver’s side.
The culprit shouldn’t be the valve guides because they were all replaced about 40 000 miles ago & my car doesn’t consume a lot of oil- possibly 1/3 quart in 1000 miles. I’m thinking about other components like rockers & adjusting screws- do these ever wear significantly? I bought a couple of adjuster screws/ elephant’s feet to look at the things & even brand new they have noticeable play in the ball & socket at the base of the screw. Is it even possible to replace these with the engine in the car? The car runs very well- the valve noise at idle just annoys me a lot especially when I know the valve clearances are correct. Any ideas appreciated. Thanks. |
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11-06-2003, 09:29 AM
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Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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At least for the 3.2 Carrera's...there's been a number of anecdotal reports that some cars are simply noisier than others....and can't find anything wrong.
Maybe the same with some 3.0's. Would be good to know if they are relatively quiet at first ( engine just warming up)...with the noise getting louder as it gets up to temp...rather than noisy all the time. ---Wil Ferch ( rather have them a "little bit" noisier than too quiet).
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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11-06-2003, 11:17 AM
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Join Date: Sep 2003
Location: South SF Bay Area, Cali
Posts: 252
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My '78 SC seems to be noisier than I remember after I got it back from a full top-end rebuild. I've only got around 1K miles on the engine, with a tune-up after 500 miles, and there is one valve on the passenger side that is so noisy I'm tempted to pop the valve covers and check the adjustments. Overall the valves are noisy but reasonable I think.
What worries me is the unevenness of the valve noise. Of course, if they were all as noisy as that one, I'd probably be freaking out... Dan 
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'78 SC "foxy brown" '69 Datsun "qt" '91 Civic SI "the stereo" |
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11-06-2003, 10:17 PM
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Join Date: Apr 2002
Posts: 217
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valve guides that are on the way out will cause noisey valvetrains even after adjustment
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11-07-2003, 02:52 AM
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