Crankshaft timing pinion - will it or won't it?
Posted: Mon Nov 30, 2020 2:57 pm
Hello, folks.
I'm in the process of rebuilding a 1955 16MS that has been 'converted' to trials trim. I bought it simply to use for the odd green-lane jaunt rather than anything serious. It was bought as a non-runner though has obviously had some brass chucked at it - brand new monobloc carb, a rather nice stainless exhaust, new chain etc etc, but I dont think it has been run since much of that was spent. Whilst coming across quite a few jobs that need doing to get it as I want it I am completely stripping the engine (as well as everything else in due course).
One task needing attention is to repair a crack around the oil outlet pipe - due to the usual overtightening by some cack-handed gorilla - I am at the point where I'm separating the crankcases and a possible stumbling block is whether the timing pinion (017195) will actually pass through the timing side bush. I'm pretty sure that on my 61 G80 it did, but that was 25+ plus years ago when I did that engine!
With this one, whilst it looks as though it should and the cases come apart so far - allowing the pinion to go about 1/8th inch through the bush - everything then goes solid and I don't want to force it naturally. If the pinion does have to come off it would mean buying a 50 quid puller as the only puller I have won't give it enough beans to pop the taper, or I run a Dremel disc down it and split it off. As this is likely to be the last AMC engine I work on (I have two other 500 singles and two twins) it seems that 25-30 quid on a new pinion is financially more tempting than a puller
Any other suggestions would be appreciated - the oil pump plunger is already out of the engine.
Steve
I'm in the process of rebuilding a 1955 16MS that has been 'converted' to trials trim. I bought it simply to use for the odd green-lane jaunt rather than anything serious. It was bought as a non-runner though has obviously had some brass chucked at it - brand new monobloc carb, a rather nice stainless exhaust, new chain etc etc, but I dont think it has been run since much of that was spent. Whilst coming across quite a few jobs that need doing to get it as I want it I am completely stripping the engine (as well as everything else in due course).
One task needing attention is to repair a crack around the oil outlet pipe - due to the usual overtightening by some cack-handed gorilla - I am at the point where I'm separating the crankcases and a possible stumbling block is whether the timing pinion (017195) will actually pass through the timing side bush. I'm pretty sure that on my 61 G80 it did, but that was 25+ plus years ago when I did that engine!
With this one, whilst it looks as though it should and the cases come apart so far - allowing the pinion to go about 1/8th inch through the bush - everything then goes solid and I don't want to force it naturally. If the pinion does have to come off it would mean buying a 50 quid puller as the only puller I have won't give it enough beans to pop the taper, or I run a Dremel disc down it and split it off. As this is likely to be the last AMC engine I work on (I have two other 500 singles and two twins) it seems that 25-30 quid on a new pinion is financially more tempting than a puller
Any other suggestions would be appreciated - the oil pump plunger is already out of the engine.
Steve