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Pulled Head Stud???
i am ready to jump... maybe someone can talk me off the ledge.
i have a 1980 3.0 SC with dilavar studs. i know they stink and are prone to break, but that's how the motor came. i recently had my valves done by a pro who presumable checked the torque on the studs before putting covers back on. i am hearing the classic PLAB-PLAB-PLAB when the car is running that gets faster with rpms... there is no rattle which might imply a broken stud... car runs and pulls just fine... there is no blow-by or oil any where near any of the mating surfaces on any cylinder... it seems to be loudest on one side closest to the timing chains... i guess my questions are: is there any obvious signs of a pulled/broken stud other than the sound? what horrible things can happen to my motor if it is driven... even to the mechanic? some posters on this page write about driving around happily with several broken studs. is it different if it's a pulled stud? any help would be greeat. i am freaking out. thank you. |
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06-08-2007, 04:29 PM
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The 3.0 is known for breaking the Dilivar studs - not pulling them.
Don't assume that your mechanic will check the head studs when doing a valve adjustment. I can't think of anything that would cause this sound after doing a valve job - unless your mechanic had to remove part of the exhaust to get to them, and now you have an exhaust leak. This would be my guess as to what's making the noise.
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Rex 1975 911s and 2012 Range Rover Sport HSE 1995 BMW R1100RS, 1948 Harley FL |
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06-08-2007, 04:41 PM
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thanks walter... so your suggesting it may be coming from the manifold? should i put a wrench on the nuts and see if one's loose? i'd ask the mechanic but hes away in costa rica
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06-08-2007, 04:56 PM
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Usually, exhaust leaks are because the gasket was damaged. That doesn't mean it's not just loose. How about getting under the car with hunk of tubing, and using the tubing as a stethiscope, to try and find the noise.
It's also possible that your time was up, and you have a broken head stud - not necessarily the fault of your mechanic. It's probably going to happen some time.
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Rex 1975 911s and 2012 Range Rover Sport HSE 1995 BMW R1100RS, 1948 Harley FL |
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06-08-2007, 05:07 PM
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Thiis is another excuse to do your own valve adjustment so you can check your own head studs
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Porsche 2005 GT3, 2006 997S with bore-scoring Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS Disposable Car: BMW 530xiT, 2008 Mini Cooper S Two-wheel art: Ducati 907IE, Ducati 851 |
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06-08-2007, 06:38 PM
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thanks guys.. appreciate the insights.
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06-08-2007, 07:04 PM
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what about damage to the motor? not asking for guarantees, but how dangerous is driving with a head stud issue?
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06-08-2007, 07:06 PM
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If it's leaking from the junction you should start to notice oil showing up there. If there is a leak and you continue to run the engine you'll begin to erode the junction between the cylinder and the head. I small amount of erosion will not be hard to fix. You have the heads resurfaced and the cylinder tops resurfaced by a competent machine shop.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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06-08-2007, 07:11 PM
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thank you. i dont see any leaks at all... yet.
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06-08-2007, 07:20 PM
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1975 Porsche 911s
