I am about to check my 1948 MK IV engine which is the 1 1/2 litre. There are discrepancies in the Instruction Book and Service Manual I have so I need clarification what are correct for this engine size and year:
Timing: 5 or 10• TDC
SPARK PLUG GAP 0.020 or 0.025”
Distributor points gap 0.010 or 0.012”
Tappet gap 0.012” on inlet and exhaust or 0.015” on inlet and 0.018” on exhaust.
Can anyone identify the inlet and exhaust tappet positions for this engine as the Manuals don’t say. Picture just says item 3 is Exhaust and 4 Inlet, and I know cylinder 1 is towards the bulkhead - the Block drawing shows what I assume are 4 round inlet ports and 3 square exhaust ports.