Firstly having taken the old sprockets and chain off the extent of the wear was really visible. The Crankshaft sprocket was unbelievably worn, I thought the teeth tips had broken off but having looked at the part they have just worn and bent. The camshaft sprocket was a bit worn but nowhere near as bad.
|Crankshaft sprockets old and new, the teeth on the old one have worn and bent over severely.|
|Camshaft Sprocket nowhere near as worn although the teeth are a bit hooked.|
|BMW Mini wheel bolt screwed into the plug hole of No 1 cylinder.|
|Timing Disc and pointer arrangement to find TDC|
The camshaft sprocket was then fitted without a chain and the sprocket alignment checked with a straight edge, all was still in alignment.
The camshaft sprocket was then rotated until both valves of No 1 cylinder were just opening/closing with the same clearance, AKA the rocking point. This is how the valves should be at TDC for correct timing.
The sprocket was then carefully removed without altering the camshaft position and refitted with the chain. A bit of trial and error to align the camshaft bolt holes by trying different tooth positions and alternative bolt holes and all was aligned. Camshaft bolts were then fitted and a check that the crank was still at TDC and the valves at rocking point. Once confirmed that the timing was set I scribed some timing marks to make the job easier if it ever has to come apart again.
|New Sprockets and timing chain fitted, valves timed and new timing marks scribed.|