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912 ignition sprocket chafing the engine


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What the hell is going on over here? The sprocket is loose but the bolt doesn’t move. The washer below the bolt is loose. You can turn the shaft about 20 degrees, even though the sprocet is held in place by the timing belt.

Help!

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Please detail how you found it.  Did the engine stop running?  I assume you're not trying to start it!  I imagine you're looking at sprocket failure, and probably damage to your oil pump shaft.  Do not even think of turning the key.

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British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland.  And Shitfaced Silly Sod to Sweden.

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49 minutes ago, Sparky said:

Please detail how you found it.  Did the engine stop running?  I assume you're not trying to start it!  I imagine you're looking at sprocket failure, and probably damage to your oil pump shaft.  Do not even think of turning the key.

Had trouble starting the car and when it started, it had an intermittent jerk while driving, that felt like it was ignition related. Noticed that the distributor cover had come loose. After putting it back on car started normally, but now my friend, who was observing the start in the engine bay, noticed a tapping sound coming from the front of the engine. After a while we noticed the chafing ignition sprocket and shut off the engine.

I remember hearing a similiar sound previously. I assumed it was the hydraulic tappets, but of course I should have remebered that the engine does not have them. I added oil and the sound went away.

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Do not start the engine.  That sprocket must be removed for investigation, but first I'd manually turn the engine to ensure cam timing hasn't slipped with resultant engine damage.  You'll need a new sprocket, possibly repair/renewal of the oil pump/distributor drive, and of course a new cambelt. 

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British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland.  And Shitfaced Silly Sod to Sweden.

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8 minutes ago, Sparky said:

Do not start the engine.  That sprocket must be removed for investigation, but first I'd manually turn the engine to ensure cam timing hasn't slipped with resultant engine damage.  You'll need a new sprocket, possibly repair/renewal of the oil pump/distributor drive, and of course a new cambelt. 

Thank you for your advice. We checked the timing and it was still correct. The cam markings lined up perfectly at the TDC. 

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