Usage:
3100 And 3200 Series Engines
Description of Change: A new cylinder head gasket is used on all 3200 Series Engines and remanufactured 3100 and 3208 Engines. The new gasket has a solid steel core with a rubber bead around liquid passages. The rubber bead provides improved sealing against leaks. The metal wrap over the combustion fire ring has a reduced width which increases the unit load (clamping force) on the fire ring. This provides an improved combustion seal. The torque recommendation for the cylinder head bolts has not changed.
Adaptable As: The new 4W45 Cylinder Head Gasket is a direct replacement for all former cylinder head gaskets in all applications for these engines. The new gasket is in effect as shown in the following chart.
NOTE: A different cylinder head bolt torque must be used on earlier and later engines. See Cylinder Head Bolt Torque Information.
Cylinder Head Bolt Torque Information
All 3100 and earlier 3200 Series Engines used cylinder head bolts with a torque specification of 130 N·m (95 lb ft).
These earlier head bolts can be identified by six dash marks on the bolt head. See Illustration 1.
Later 3204 and 3208 Engines use stronger cylinder head bolts with a higher torque specification. These bolts can be identified by seven dash marks on the bolt head. See Illustration 1.
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The higher cylinder head bolt torque may be earlier engines ONLY if the bolts are replaced with the later higher strength bolts (seven dash marks on the bolt head). If the earlier bolts are tightened to the later torque specification, they may yield (stretch) and lose their clamping force.
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Illustration 1. Bolt Head Identification.
Before installing the cylinder head bolts put engine oil on the threads. Tighten the bolts as shown in Illustration 2 and the Head Bolt Chart.
Illustration 2. Cylinder Head Bolt Tightening Sequence.