Petter AVA series 2

I am currently restoring a Petter designed diesel but built by Kirloskar in
India that has the same specifications as the Petter AVA Series 2 engine
(twin cylinder 12 bhp)
I would appreciate if someone could kindly let me have the tappet clearances
plus the spill timing degrees before TDC. The only mark on the flywheel is
that for TDC. The engine will be operating at 1500 rpm driving an
alternator - 10 kva 3 phase 380/220 volts.
I only have the parts manual from semidiesel and unfortunately it does not
have the details I require.
Any help, including torque settings, will be greatfully appreciated.
Charles