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hipdoc's Avatar
Join Date: Sep 2007
Location: Fresno, CA
Posts: 158

I just finish rebuilding (replaced 2 broken studs) my 1980 911SC engine and it started and ran great. The 3rd time I started it (several days later) there was a loud clanking noise on the driver's side of the engine. Fearing I jumped timing I dropped the engine but the carrera tensioners and timing was intact and when I manually turned the engine over it was fine (no signs the pistons were hitting the valves). Got the engine back in and it started and ran fine again but days later it that the clanking sound on the Left side of the engine was there again. I changed my starter but no difference. I ended up allowing the car to run and that clanking sound went away. Could it be no oil getting to a rockers? Help.

Last edited by hipdoc; 09-14-2016 at 09:19 AM..
Old 09-14-2016, 09:15 AM
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Registered User
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 7,360
I would be more inclined to be looking at the tensioner. Chain rattle at about 2000.
If a rocker fell out, it would stay clanking
Old 09-14-2016, 10:15 AM
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tharbert's Avatar
Join Date: Jun 2008
Location: So. Illinois
Posts: 1,737
We've discussed tensioners recently and even talked about failure modes and possible causes. They can apparently be bad right out of the box or as maybe you're experiencing, a gradual or episodic failure. I'm betting if you look inside your left chain box, you'll find a collapsed or mushy tensioner. I'd also poke around for a loose chain ramp too for giggles.

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Old 09-14-2016, 01:36 PM
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