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Registered
Join Date: Feb 2016
Location: Gothenburg - Sweden
Posts: 474
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Chain Tensioner Safety Collar
Hi All!
I've been rebuilding my 71T engine. New chain and sprockets among other things... It is a stock engine with original cams etc. I decided to go original chain tensioners as well. I have rebuilt them. Now when they're in place I was going to install safety collars on them. But I have not got enough room for them and the space required. Should I help the tensioners in some way to go out a bit further? Is that even possible? If so, how do I do it? Or is there something I've got wrong? Thanks for your help! Jörgen Forssling Gothenburg SWEDEN 
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08-23-2020, 09:42 AM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,474
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Run the motor for a while, let the chains work in and then go back and install. The guards are supposed to sit 3 or 4 mm above the top of the tensioner housing.
Bruce |
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08-23-2020, 03:41 PM
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Registered User 4'10
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Hi Jorgen,
Several years ago I was faced with the same issue in my 69E – only a mm or 2 of space between the top of the tensioner and the guards. My chain was also fairly new. I did a lot of searching on the forum and manuals, and decided to go ahead and install them that way. I’d previously had tensioner issues, and although I had just rebuilt those tensioners, I figured having less movement of the chains (because of the guards) was a lot better than ever having a tensioner go bad again. This way they act almost like a mechanical tensioner. Of course, they aren’t install & forget. You do need to periodically check and readjust them. However, having said that, I must confess that my car is still in rebuild state and that I haven’t fired up the engine yet. Good luck with yours, and let us know how it goes. Cheers, jt 
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jt - '69 911E, PCA-RMR '75-'82; Current Other: '16 BMW 328i, '18 Subaru Forester, '09 Kawi Concours 14, '85 VW Westfalia, C172, C152; Previous Notables: '89 Goldwing (RIP), '80 Suzuki 850, '64 Ducati 250, '64 Bug (wish I'd known about that #3 exhaust valve...), '59 Austin-Healey BN100-6, '59 Impala 2-door hard-top (cool!). '49 Cushman motor scooter, Grumman AA5A & AA5B |
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09-06-2020, 10:08 AM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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If you can't fit the collars, I doubt there would be enough play to skip a tooth on the sprocket if the tensoiner failed.
Follow Bruce's advice.
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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09-07-2020, 05:44 PM
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Registered
Join Date: Feb 2016
Location: Gothenburg - Sweden
Posts: 474
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I have now installed the collars. They have the proper distance from the tensioner body and the piston protrudes a millimeter or so.
I will run the engine and have a look at them after that. Thanks for all your input. //Jörgen |
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09-07-2020, 11:02 PM
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Registered
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My seemed very tight when I installed them also but I didn’t it anyway knowing the chain would stretch.
Good Luck Tony |
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09-07-2020, 11:19 PM
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My Garage
1971 Porsche 911
Baja Bug
