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Quote:
https://youtube.com/shorts/WjcJrKGx88s?feature=share Here’s a video of the noise with engine fully warmed up. This was after 3 valve adjustments |
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03-09-2023, 05:27 PM
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PCA Member since 1988
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That's pretty loud. Not a "tick," but a hammering. You have at least one valve way out of spec, or like Ivan suggested, possibly a broken spring. You will have to pull off all the rocker covers and inspect. It looks like you have at least one of the top valve covers off. What have you found out so far?
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners. Cars are for driving. If you want art, get something you can hang on the wall! Last edited by PeteKz; 03-09-2023 at 09:36 PM.. |
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03-09-2023, 09:28 PM
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Registered
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yup broken spring use a screwdriver to locate which valve is the culprit(use a screwdriver as a stethoscope.handle in your fist and the other end touch the top of the valve cover) and stop running the engine asap .Remove the cover upper and lower 123 side (you know that) drain the oil prior(save it)
I can actually do it with my hand to see which one it is, using my tool for adjusting the valves.You should not be able whatsoever to push on the valve .If yes that is the spring. Once you locate the valve there is a tool which can be used to replace the spring locally without tearing the engine apart. And of course if you have small tinny mirror -used if you can see?Most of the times the larger spring is broken. You do not want to ended up like this -engine i just finished...  tool i use to compress the valve if need it  tools you need to replace the springs,one for the intake and the other for exhaust side.Somebody could lend it to you..You also need a compressor to run air into the chamber with compression check tool hose.In order for the valve to stay in place. 
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1985 911 with original 502 191 miles...808 198 km "The difference between genius and stupidity is that, genius has its limits". Albert Einstein. Last edited by proporsche; 03-10-2023 at 10:17 AM.. |
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03-09-2023, 10:39 PM
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New-ish 911SC Targa Owner
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Broken valve springs must be pretty common with these flat sixes. I had one I didn't even notice until rebuild time.
The air pressure tip Ivan suggested to keep the valve closed while you remove the retainer/springs/keepers does work. I've also seen people insert a rope into the sparkplug hole until it takes up all the space to prevent the valve from falling in. |
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03-10-2023, 03:14 AM
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1972 Porsche 911T
Jeanine
