Jeep Engine >> CYLINDER HEAD BOLT INSTALLATION CAUTION
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Jeep Engine >> CYLINDER HEAD BOLT INSTALLATION CAUTION
Cylinder Head Bolt Installation Caution On
1980-87 Chrysler 4.0 & 4.2L Engines
Chrysler (AMC Jeep) 4.2L (258 CID) engines manufactured from 1973 through 1980 use 1/2 diameter cylinder head bolts that are torqued to 105 lbs.ft. The number 11 bolt requires thread sealer to prevent external coolant leaks.
As of the 1981 production year, all 4.2L (258 CID) engine head bolts have been reduced to 7/16 in diameter. These smaller bolts should be torqued in sequence to 85 lbs.ft except for the number 11 bolt which requires only 75 lbs.ft. Again, sealer is required on the number 11 bolt to guard against external
coolant leaks.
The 4.0L (242 CID) engine introduced in 1987 and used in Jeep trucks uses the same torque pattern, but require 110 lbs.ft. of torque for all but the number 11 bolt. Torque this bolt to 100 lbs.ft. after applying a pliable sealer.
For additional information see AERA Technical Bulletin: SB 112
The AERA Technical Committee
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