| AMC Engine >> DEFECTIVE CYL HEAD BOLTS ON SOME AMC 4.2L ENGINES |
Defective Cylinder Head Bolts On
Chrysler (AMC) 2.46L and 4.2L Engines
Some bolts used on the spark plug side of the cylinder head in AMC 2.46L, 4 cylinder and 4.2L, 6 cylinder engines, were improperly hardened and may break under the bolt head or in the bolt thread area. The engines with suspect bolts are coded as follows:
4 cyl. -- 310U06 thru 310U14 (5 bolts)
6 cyl. -- 310C06 thru 310C14 (7 bolts)
NOTE: The engine code is stamped on a machined surface on the distributor side of the block.
Be sure to follow the bolt tightening sequence and torque specifications below when replacing bolts. Whenever a broken bolt is found, all the bolts on the spark plug side of the head should be replaced with new bolts (No. 400 6593).
The AERA Technical Committee
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