MerCruiser Cylinder head 4cyl 3.0L 140hp 1990-97 14098820 936-810840 OMC Volvo Exhaust Boots One is good one is

One is good one is bad

Induction Manifold: 13545A 1 814033-C1

This Plate Mounts to Part #: 64164A 2

Upper Roller Bearing: 31-43013A 1

MerCruiser Cylinder head 4cyl 3.0L 140hp 1990-97 14098820 936-810840 OMC Volvo Exhaust Boots One is good one isItem Details MerCruiser Part Number 936 810840 Used from 1990 1999? or maybe just 1990 1997 on MerCruiser & OMC GM 140hp 4cyl 3. 0L engines using the 1 piece oil seal Just check the stamped part number This is for engines with a 1 piece rear main seal. which they switched over to in 1990 but may have been found on some earlier 2 piece setups as well. GM part # 14098820 14098620 as I see in some references Just make sure yours has the same stamped part