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Registered
Join Date: Sep 2000
Location: Roseville, CA
Posts: 85
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Knocking Noise
I have a definite knocking noise coming from what sound like the #1 cylinder intake side valve cover. It has been there for about 1.5 months. At first I thought it might be loose valves so I did a valve adjustment and check all the head studs (they all seemed ok). After I was done with the valve job there was really no change in the noise. But now it seems to have gotten louder. Any one have any ideas. BTW it does not sound like it is coming from the tensioner area, but I could be wrong (I have the pressure fed tensioners). My car is a 79' sc. Thanks.
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12-27-2001, 03:51 PM
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Registered
Join Date: Nov 2001
Location: Naperville IL
Posts: 54
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I am interested as well. I have a slight knock from the same area. I also have a 79sc. Curious.
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BryanM 1979 911SC Targa |
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12-27-2001, 04:39 PM
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Join Date: Sep 2000
Location: Roseville, CA
Posts: 85
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No one has any ideas?
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12-28-2001, 12:52 PM
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Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Well, I suppose the #1 intake rocker shaft could have worked loose ... but I would have thought you checked for that when you did the valves ...
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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12-28-2001, 01:13 PM
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Black and Blue
Join Date: Jul 2000
Location: Austin, TX USA - Ya'll
Posts: 2,552
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I have the same knock...curious to hear some input...
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Kemo 1978 911 SC Non-Sunroof Coupe, two tone Primer Black and SWEPCO Blue, Currently serving as a Track Whore 1981 911 SC Sunroof Coupe, Pacific Blue Project, Future Daily Driver |
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12-28-2001, 02:07 PM
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Senior Member
Join Date: Jan 2001
Location: Left Coast, Canada
Posts: 4,572
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Knockin' guys...
Take a long screwdriver or metal rod, put it to your ear, and probe around with the motor running. Don't get your tie caught in the fan  Listen in various places for the "knock". Tensioners, ramps, chains ???? Leave no noise un-checked.
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'81 SC Coupe "Blue Bomber" "Keep your eyes on the road, and your hands upon the wheel."- J.D.M. |
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12-28-2001, 03:56 PM
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Registered
Join Date: Sep 2000
Location: Roseville, CA
Posts: 85
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Already tried the screwdriver trick (actually a torque wrench it was longer; same effect). I tried both the chain tensioner and the passenger intake valve cover. The noise was much louder from the valve cover. Its funny that no one has noticed this knocking on their cars before and that they are all pre 1980. I wonder if has to do with the poor oil pickup in these cars. Maybe something was starved of oil.
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12-28-2001, 04:55 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,431
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sometimes a worn wrist pin bushing, or even a rod knock sounds like it's coming from the head area. pull the plug wire off and see if the sound lessens or stops.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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12-28-2001, 05:12 PM
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