Engine >> DEFECTIVE CYL HEAD BOLTS ON SOME AMC 4.2L ENGINES
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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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