CYLINDER HEAD GP 9Y3640 - Caterpillar

Liner Projection And Machining The Block And/Or Head
Do NOT adjust the liner projection above the block if it measures in the range of 0.03 to 0.15 mm (.0013 to .0069 in). ALSO, make sure that the differences between all four measurements at any one cylinder do not exceed 0.05 mm (.002 in). AND, the difference between the average projection of two liners next to each other must not exceed 0.05 mm (.002 in). These specifications are in the Service Manual for these engines.
Wear or erosion under the liner flange will require use of stainless steel inserts. See the following list of insert part numbers and corresponding thicknesses. The head and/or block surfaces may have been damaged if the engine was operated extensively after a head gasket failure.
9L5855 0.76 mm (.030 in)9L5856 0.89 mm (.035 in)9L5857 1.02 mm (.040 in)9L5858 1.14 mm (.045 in)The maximum amount of material that can be machined from the top deck of the block is controlled by the minimum dimension from the crankshaft centerline to the top deck on the block. This minimum is 383.10 mm (15.083 in), and is also in the Guideline for Reusable Parts SEBF8076. Use the 6V7840 Deck Checking Tool Group to measure this dimension. Special Instruction SEHS8187 explains the use of this device.
There is also a minimum allowable thickness for the head. This is 98.89 mm (3.893 in), and limits the amount of material that can be taken off the bottom of the head.
The cylinder head bolt torque is 250 17 N m (185 13 lb ft). Follow the bolt tightening sequence in the Service Manual.