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Old 05-13-2005, 02:44 PM   #1
fastlane
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Default Anyone ever have a Intake Cam bolt snap off while driving????

Last night, I was out driving when my car just died...it turned over but was making an awful sound from the timing belt cover area. The time interval leading upto the engine dying was uneventful and no weird sounds emanted from the engine compartment.

Anyway, after finally getting the car back to my house and pulling off the valve cover and timing cover, the only thing I found wrong was the bolt that holds the passenger side intake cam sprocket to the cam shaft was twisted in half. The cam still spins a full revolution without any unordinary binding, other than the obvious tension caused by the valves opening. Without the cam sprocket in place, the engine turns freely and everything seems to be in order...

So, it looks like I might be about ready to source some new cams and such. I just wanted to see if anyone else has had a similar experience.
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Old 05-13-2005, 08:24 PM   #2
ncarn8
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so the bold that holds the cam sprocket on sheared off? that is way odd. Never heard of that. What was causing the noise? the sprocket was still held on wy the keyway and tension, are you sure your valves are still closing properly?
im not sure im 100% clear on exactly what you mean
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Old 05-14-2005, 08:36 PM   #3
fastlane
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The intake cam sprocket was still being turned by the timing belt and chewed up the plastic backing cover, but the intake cam was not turning. We drilled and easy outted the old bolt and replaced the broken parts and all is well again. Just a very odd experience.....btw, the sprocket bolt had signs of rust at the shearing point. It looked like it maybe had a hairline fracture from the factory and 102K miles of beating finally took its toll.
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Old 05-14-2005, 08:54 PM   #4
eastcoastbumps
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Did you buy the car new? I ask because the bumper beam doesn't protect the intake cam gear from impact in a minor front end collision. My car was in an accident and the timing belt cover was cracked and the belt skipped a few teeth.
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Old 05-14-2005, 09:42 PM   #5
subbyspeed
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i'd do a leakdown on that.. good possibility that the valves are bent.
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Old 05-16-2005, 10:58 AM   #6
fastlane
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I bought the car new and it has never been in an accident...also, I did do a leakdown test and everything is fine. There was no valve to piston interference.
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Old 05-16-2005, 05:18 PM   #7
subbyspeed
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sweet! quite lucky my friend!
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