Dellortoman
Hero member
- Location
- Tasmania, Australia
I also reckon Piet is on the money. Those curved gouges on the inside of the inner plate are what you'd expect to see if there was a burr on the side of a tooth impinging on the chain side plate, but only if the chain was installed the other way. So it seems to me that the chain has been removed since it was damaged, flipped over and installed with the chewed bit facing outward. If you have a look at the opposite side (underside of the chain between the two cam sprockets), it may tell you if the damage is still happening. If the other side of the chain is OK, then whatever was causing the damage has probably been removed, or may even have been in a different engine.
There are also traces of similar gouges at the left end (in Jo's photo) of the inner plate, from which we can infer that the dodgy sprocket tooth has been engaging with every roller of the chain. Therefore the offending tooth must be on the crankshaft (rather than a camshaft sprocket) because the camshaft sprockets have an even number of teeth (30) so any particular tooth will always engage in a gap with either inner or outer side plates, but not both. The crank sprocket with 15 teeth will alternate between inner and outer plates, and eventually hook up with all of them.
Do as Brett suggested and have a close look at the teeth on the crank sprocket with a good torch. Although it sounds like he buys his torches from America if he calls them flashlights.
You'll probably need to drop the cam chain out to get a good look at the sprocket. It's a bit of a fiddle to feed the new chain through without the old chain to pull it, but it's do-able.
There are also traces of similar gouges at the left end (in Jo's photo) of the inner plate, from which we can infer that the dodgy sprocket tooth has been engaging with every roller of the chain. Therefore the offending tooth must be on the crankshaft (rather than a camshaft sprocket) because the camshaft sprockets have an even number of teeth (30) so any particular tooth will always engage in a gap with either inner or outer side plates, but not both. The crank sprocket with 15 teeth will alternate between inner and outer plates, and eventually hook up with all of them.
Do as Brett suggested and have a close look at the teeth on the crank sprocket with a good torch. Although it sounds like he buys his torches from America if he calls them flashlights.
You'll probably need to drop the cam chain out to get a good look at the sprocket. It's a bit of a fiddle to feed the new chain through without the old chain to pull it, but it's do-able.
