COVER 1B3487 - Caterpillar

Do not use the 7N3642 Cylinder Head Gasket on engines that had the former cylinder block. The result can be a failure of the cylinder head gasket and engine damage.
Chart 2 shows the parts needed to install the new cylinder block in an engine that had the former cylinder block. Since the former cylinder block is canceled, the new parts will be sent if the former cylinder block is ordered. Be sure to check the engine or machine serial number before you order the parts.
Chart 3 gives the part numbers of cylinder head assemblies for parts service on engines that have the former cylinder block. Also shown are part numbers of cylinder head assemblies for parts service on older engines that had the new style cylinder block already installed.
Procedure To Tighten Cylinder Head Bolts
The torque to tighten the cylinder head bolts on engines with the new style cylinder block is higher than for engines with the former cylinder block.
Do not tighten the nuts for the cylinder heads on engines with the former cylinder block to the new higher torque. This can cause a failure of the threads on the studs. Tighten the nuts to the torque shown in the Service Manual.
The procedure to tighten the bolts for the cylinder heads on engines with the new style cylinder block will be added to the Service Manual at a later date.
Use the procedure that follows to tighten the cylinder head bolts on engines with the new style cylinder block.
1. Tighten bolts 1 through 13 in number sequence to 75 lb ft (100 N m).2. Tighten bolts A through H in letter sequence to 210 lb ft (284 N m).3. Tighten bolts A through H in letter sequence to 420 lb ft (565 N m).4. Tighten bolts 1 through 13 in number sequence to 150 lb ft (205 N m).5. Use a torque wrench to tighten bolts 14 through 19 in number sequence to 75 10 lb ft (100 14 N m).6. Use a torque wrench to tighten bolts A through H in letter sequence to 420 lb ft (565 N m).7. Use a torque wrench to tighten bolts 1 through 13 in number sequence to 150 lb ft (205 N m).
Schematic of cylinder head bolts.