Mk.3 timing plug accuracy?

The plug and slot in the crank should be in the right place but the timing plates are notorious (they're slotted) and even the primary chaincase although dowelled together, isn't dowelled to the crankcase so there is the possibility of a slight variation.

Head off and a degree disc on the timing side is the only real way to check the accuracy of the plate. That said, with current fuel variations we may all be doing it wrong anyway !

Previously charles_claxton wrote:

Does anbody know if the crankcase timing hole is subject to variation?

I'm fitting a new ignition unit, and thought I'd use that as the 'fully advanced' setting.... BUT: The timing mark on the primary side shows 32 degrees when the hole lines up? (Not 28 as it should be)

Has anyone else tried and got different results?

I know I should have checked the accuracy of both by doing a TDC check when the head was off, but hindsight is a wonderful thing and short cuts are so enticing!

The ignition timing degree scale in the primmarey chain case cover is just a bit of bent metal atached with two screws which can be easerly moved or bent. I would realign to the crankshaft alignment. Most accurate method dial gauge and degree disc, but as all engines vary I would use the crankshaft timing and the adjust to engine running if needed.