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Old 11-04-2005, 08:01 PM   #1
fastlane
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^^Nomo - 04 GT Stang now

Default HELP>>>>>Broken Intake Cam bolt...3rd time in 6 months

Just as the title says...I have gone through the ordeal of having the bolt that secures the passenger side intake cam sprocket break. This in turn usually causes the cam sprocket to be chewed. I have replaced all of the cam bolts, and both passenger intake and exhast cam sprockets twice now. The last time was just about a month ago. The first time this happened, I was running a stock 2.0L block but about 2 months ago, I rebuilt the motor using a 2.5L STi shortblock. I had the heads reworked at the same time. About 2-3 weeks after the rebuild, the bolt broke for a second time. the car was down for 2 weeks while I waited for parts to show up....now, the car is dead again in a department store's parking lot where it will sit until I can get a trailer over there tomorrow.

Does anyone have any idea of what could cause a cam sprocket bolt to break? They have all broken at the same spot, right at the first thread line in the cam.

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Old 11-05-2005, 12:38 AM   #2
RobSub
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Mechanical vibrations caused by an imbalance.
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Old 11-05-2005, 08:26 AM   #3
fastlane
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That is about the same conclusion as what I have come up with. I thought it might possibly be some binding issue but I figured that would cause the tming to jump...I hope I don't need to go buy cams..ugh.
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Old 11-05-2005, 12:42 PM   #4
jmussetter
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could the timing belt tension be to tight and is causing a binding/breaking issue? I though you were breaking them while removing them for the rebuild, since this is a hard one to get off, but if it's breaking while driving, then that IS strange...

-jason
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Old 11-07-2005, 04:15 PM   #5
fastlane
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The 3 bolts I have broken have all been while driving. They have all happened at low load and low rpm. The cam sprocket shows a lot of wear on the edge closest to the head/block, almost like the belt is sliding off and tweaking the pulley.

The engine is on its way out of the car right now. I will be checking the cam for trueness shortly. The endplay seems to be negligable.
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Old 03-04-2008, 06:12 PM   #6
vids
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Hi, did you ever find out what happened?
This just happened to my motor too, so I am very curious! Will be glad to not have this happen again...
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Old 03-05-2008, 04:33 AM   #7
vids
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Or has anyone else found out why this could happen?
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