This a zero (-0) size timing gear for all three-piece case 356-912 engines.

Notes: Don't be confused with the "O" mark on the front of the gear which is to be aligned between punch marks on the crankshaft gear.

Gear size marking are on the rear of this gear. There must be a clearance between this gear and the crankshaft gear of 0.015 and 0.040, with the crankshaft held stationary; measure with a dial indicator.

There are five gear sizes:

• -2: PCG 105 103 22
• -1: PCG 105 103 12
• +1: PCG 105 103 32
• +2: PCG 105 103 42