5_108.bk Page 227 Thursday, October 4, 2001 11:45 AM
REPAIR INSTRUCTIONS Cylinder Head Installation
INSTALLATION
DESCRIPTION
Ensure that the cylinder heads are in acceptable condition. Refer to the cylinder head inspection procedures in “CYLINDER HEAD OVERHAUL” on page 157.
Each cylinder head is a one-piece casting covering three cylinders and securely held to the top of the cylinder block by special-head bolts. The inlet and exhaust valves and fuel injection nozzles are located in the cylinder heads. Valve seat inserts and valve guides are replaceable. Cast-iron sleeves pass through the coolant cavity of the cylinder head at the center of each cylinder. The fuel injection nozzle holder assemblies are installed in these sleeves. The sleeve design and installation provides effective cooling for the fuel injection nozzles, valves and cylinder head. This sleeve also provides a sealed passage for the nozzle return-to-tank fuel, which passes from the nozzle sleeve chamber into a drilled fuel return passage in the cylinder head and back to the fuel tank. The air inlet, coolant and exhaust manifolds are secured to the cylinder heads. The fuel inlet lines also enter the engine at the cylinder heads.
All M-E7 head gaskets are precoated and do not require any type of additional sealing compound. Refer to Figure 302. 1. Place the head gaskets in position on the locating pins in the cylinder block deck. 2. Place a fire ring carefully in position on top of each cylinder sleeve.
Check that the design of the fire ring used is the correct match for the cylinder sleeves installed. 3. Position the completely assembled cylinder heads on the cylinder block. Locate the heads into the guide pins in the cylinder block.
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