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Cam Gear Crack

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Old May 30, 2009 | 03:48 PM
  #1  
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Default Cam Gear Crack

While checking the tension on the timing belt I noticed a crack in the cam gear.
Conventional wisdom says not to drive the car until the repair is made.
What do you think?
Car is an 84S auto and located in Pittsburgh. I was planning on going to SITM next weekend but maybe not.

TIA........
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Old May 30, 2009 | 03:53 PM
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We think you are a very smart person to not to drive till its fixed, hhehe. Although your engine is a non-interference engine I am sure there will be some serious external damage if the cam gear lets go.
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Old May 30, 2009 | 03:56 PM
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These gears have a finish on them, kind of a thick coating of some kind and that may be just the finish that is cracked as in it could flake away and reveal the metal surface below is not cracked...but even if I'm right I don't know if that means you could trust it.
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Old May 30, 2009 | 05:10 PM
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Originally Posted by Giovanni
We think you are a very smart person to not to drive till its fixed, hhehe. Although your engine is a non-interference engine I am sure there will be some serious external damage if the cam gear lets go.
Yea, like breaking the end off of a cam.
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Old May 30, 2009 | 06:31 PM
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Now this is a crack :
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gear.jpg (29.6 KB, 80 views)
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Old May 30, 2009 | 07:10 PM
  #6  
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I would think that with a cracked gear there must be something else in the valve train thats causing excessive vibration
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Old May 30, 2009 | 07:16 PM
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Warped cam tower? Belt rollers out of whack [I can attest to this one]?

Originally Posted by Mrmerlin
I would think that with a cracked gear there must be something else in the valve train thats causing excessive vibration
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Old May 31, 2009 | 05:26 AM
  #8  
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You COULD have that fixed in time for SITM -- I'd say order all of the parts you might need, do the work, then return whatever you don't need. Most vendors are OK with this(ask first anyway). It's only a few hour's work on an early car, assuming the 928 gods smile on your water pump bolts and none snap.
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Old May 31, 2009 | 06:14 AM
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Looking at the rear of the tooth it is missing a piece..possible it has picked up and tagged something in its travels...definetely looks likeits all over for that one.
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Old May 31, 2009 | 07:47 AM
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Originally Posted by oz928s4
Looking at the rear of the tooth it is missing a piece..possible it has picked up and tagged something in its travels...definetely looks likeits all over for that one.
Isn't that the timing notch?

I agree that you shouldn't drive it. You got lucky by noticing it before it let you know in another way, I wouldn't tempt fate.
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Old May 31, 2009 | 10:24 AM
  #11  
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Hi Mike, yes that is the timing notch which is why I noticed it.
And Dave A, parts are coming in on tuesday, which is the last day I can work on it due to other commitments. Having only assisted on a T/B W/P job before I will not press the issue and try to make SITM and possibly screw myself even more.
Thanks all for the comments
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Old May 31, 2009 | 01:58 PM
  #12  
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Originally Posted by Grey Wolf
Hi Mike, yes that is the timing notch which is why I noticed it.
And Dave A, parts are coming in on tuesday, which is the last day I can work on it due to other commitments. Having only assisted on a T/B W/P job before I will not press the issue and try to make SITM and possibly screw myself even more.
Thanks all for the comments
Indeed, that belt doesn't look very good, from the pictures. There is quite a bit of "checking" and rubber buildup. I'd think you are doing the correct thing, by not pressing the issue.
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