Century V6-260 4.3L DSL (1984)
Crankshaft Main Bearing: Technical Service Bulletins
Diesel Engine - Main Bearing Cap to Block Bolts
Bulletin
84-6-15
Date
Jan. '84
Ref. No.
84-090-6
SUBJECT:
MAIN BEARING CAP TO BLOCK BOLTS
MODELS AFFECTED: 1982-1984 V-6 DIESEL
There are two different length main bearing cap-to-block bolts being used in production. An engine will have only one length cap bolt; there is no mixing
of bolt types. Bolt length is measured from the bottom of the bolt head to the end of the threaded part of the bolt.
One type of cap bolt is 100 mm (3-15/16") long. It is used on engines that have main bearing caps that have their location in the engine cast into the cap,
i.e., 3 = number three main bearing cap.
BEARING CAP-TO-BLOCK BOLTS
The other type of cap bolt is 110 mm (4-11/32") long. It is used on engines that have main bearing caps that have their location in the engine identified
by the number of raised ribs cast into the cap. See Illustration.
Using a long bolt where a shorter length is required will cause the bolt to bottom out before the bolt is contacting the main bearing cap. Using a shorter
main bearing cap bolt than required will reduce the amount of thread engagement. This will cause the block threads to strip.
