Buick Engine >> CRANKSHAFT IDENTIFICATION (3300 BUICK)
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Buick Engine >> CRANKSHAFT IDENTIFICATION (3300 BUICK)
Crankshaft Identification On
GM 3.3L 3300 Buick Engines
The AERA Technical Committee advises caution when replacing the crankshaft on GM 3.3L engines. Currently there are two different crankshaft designs and with four different casting numbers used in this engine. While it is acceptable to interchange certain crankshaft castings, do not cross year and design designations.
The first design crankshaft uses a two-piece rear main seal while the second design incorporates a one-piece full-circle seal. Each crankshaft design uses a unique seal surface dimension prohibiting interchange.
The easiest way to identify the different crankshaft castings is to count the number of flywheel retaining bolt holes: one has six (6), the other eight (8). The chart below list additional differences on GM 3.3L crankshafts:
Years Used Casting #S Rear Seal Rear Bolt Flange
Dimmension
1989-90 1235413, 694 2.656 six (6) bolt holes
1991-93 817*, 4817 3.228 eight (8) bolt holes
*Note: DO NOT CONFUSE THIS CASTING # WITH THE 1985-87 GM 2.8L
CRANKSHAFT, IT HAS THE SAME CASTING #.
The AERA Technical Committee
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