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Join Date: May 2003
Location: San Diego, CA
Posts: 191
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Make sure to check your intermediate shaft alignment
Or something like that.. I just took an engine I bought for parts apart. The smaller gears to drive the chains are toast. This one has no teeth left, the other is so pointy it feels like I could cut my finder on it. How does this happen?
  Couldn't find the teeth anywhere in the case. Hopefully they didn't find their way into the oil pump. Jesse 76 911S |
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03-19-2009, 07:48 PM
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Join Date: May 2003
Posts: 3,346
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Mechanical tensioners maybe? Maybe someone put new chains on worn sprokets or the engine just has too many miles on it.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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03-19-2009, 07:52 PM
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Location: Nash County, NC.
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There was someone the other day that the cam gear was wrong face out and there was no alignment done on building the engine. I have to admit,I never saw one that bad.
Bruce |
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03-20-2009, 01:27 AM
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Location: San Diego, CA
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It also looks like the chain was rubbing on the side of the main gear. I wonder if its possible to be that far out of alignment? If it is that would explain such a catastrophic failure.
The engine looks pretty clean otherwise, probably a recent rebuilt. They tried to use red locktite to seal the case and heads and there was so much it nearly clogged some of the oil passages. - Jesse 76 911S |
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03-20-2009, 07:50 AM
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My guess is that old chains were used. As chains wear they get longer as each individual pin and hole wears. If you put an old chain on new bike gears you get the same thing with the sprockets wearing very quickly. As far as the uneven part, the comment about the mis-installed gear on cam shaft sounds reasonable. Did you happen to notice the alignment of the gears when took them off?
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
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03-20-2009, 09:59 AM
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Join Date: Jun 2003
Location: Camarillo, Ca.
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Damage to the gear happened when the sprocket failed. the chain was no longer aligned and contacted the gear.
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Aaron.  F.S. 1965 Solex engine w carbs/cleanerBurnham Performance https://www.instagram.com/burnhamperformance/ |
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03-20-2009, 11:09 AM
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Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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cam gears on wrong.
i wonder what kind of racket that made? had t be audible. surprised it did not break the chain hitting on the gear like that and for that long. i would not trust the oil pump.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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03-23-2009, 08:41 AM
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1969 Porsche 911E 2.0 E
