Hello all. I’ve discovered the wonderful world of stationary engines recently and have a Petter A1 and a Lister D petrol engines. I’m having a hell of a time getting the Lister to run. I noticed today that the valve timing seems to be incorrect..that’s if a book I have is correct. The inlet valve opened at approx 12 degrees after TDC. The book says that the inlet valve should open at 12 degrees before TDC and the exhaust valve should open 44 degrees before BDC.

Is this correct, does anyone know please? I’ve set the crank to TDC and got the cam of the push rod assembly pointing upwards between the two feet of the cam followers....all done correctly...but the inlet valve opens at 12 degrees AFTER TDC.

Thanks for any help