Great explanation Gordon!
Daniel,
This is a common thing whenever you pull the distributor or the oil pump.
I didn't want to give advice as I've never pulled apart a Roadster motor, but
from Gordon's explanation, it's the same setup as L series engines, and I do
have a ton of experience on those. Having gone through this scenario myself
it sounds like it slipped a drive gear tooth. One of the major rules of
thumb whenever pulling apart any motor is memorizing all details of how it
existed before you disassemble it. In this case the direction/angle the oil
pump drive shaft slotted end as it mates to the distributor drive end. When
pulling the oil pump, I always mark the direction/angle onto the block itself
to remind me where it should be pointing when at TDC. Normally, swapping the
distributor is much easier (if you don't pull the oil pump) as the oil pump
shaft stays set and the driveshaft keyways are offset, meaning the
distributor can really only go back on one way.
Also, I think I mentioned this to you before...make sure you have it set at
TDC on the COMPRESSION stroke. Both intake and exhaust valves should be
closed. The lobes on the cam will be pointing upward or slighly sideways.
The engine will have 4 times where the timing mark on the crank will be
pointing at zero. If you've lined up the mark on the wrong stroke, nothing
you do with the pump/distrib. will make a difference.
Good luck!
Stan Wada
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