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Join Date: Aug 2020
Posts: 66
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Chain Tensioner Stud
I'm in the process of putting my engine back together after addressing some leaks at the cam boxes and thrust plates (and everywhere else). After timing the cams I put my Carrera tensioner in the left chain box and went to torque the 8mm nut to 25nm and sure enough, the stud started to pull. My boxes are magnesium, engine is a '74 2.7.
Is my only solution to replace the box? I've been contemplating a time-sert, but it feels wrong since it supports the tensioner. It kills me to have to break everything down again and start over...not to mention the cost of new boxes. Any help advice is appreciated! 
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10-16-2022, 08:36 AM
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Join Date: Oct 2001
Location: San Carlos, CA US
Posts: 5,521
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Timesert is fine for that application. Although, you SHOULD have and might now need to seal up the back of that hole with JB weld so that it does not leak through the back. That might make you pull the timing box off the engine again. However, it is doable with the engine in the car, assisted with some well-timed four letter words.
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10-16-2022, 09:00 AM
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JBWeld chain box repair..........
Just remove the left side chain housing and inspect it. Most likely you will need to clean it and apply some JBWeld to keep the stud in place and prevent oil leakage. There are several spots at the backside of the chain boxes that need to be sealed. If you did not apply fresh JBWeld to the other chain housing, it would be wise and prudent to apply to the right side too. BTW, there are several locations on your engine that need epoxy sealant during a rebuild. This is the right time to fix them.
Tony Last edited by boyt911sc; 10-16-2022 at 09:47 AM.. |
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10-16-2022, 09:39 AM
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Join Date: Aug 2020
Posts: 66
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Thanks for the replies. I absolutely put fresh JB Weld on the back of the boxes, oil galley plugs, and oil cooler area. I’ve replaced every seal I can and had to fix a bunch of stripped threads.
Do you think a time-sert with thread sealant (not locker) would do the job of stopping leaks? Just curious. I’ll probably pull the box and do it right anyway. |
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10-16-2022, 09:47 AM
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Join Date: Feb 2009
Posts: 1,006
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Loctite the insert and stud, it won’t leak.
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10-16-2022, 11:41 AM
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Quote:
Ivan
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1985 911 with original 501 708 miles...807 421 km "The difference between genius and stupidity is that, genius has its limits". Albert Einstein. |
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10-16-2022, 11:58 AM
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