Mercury MerCruiser D2.8L D-Tronic Service Manual page 253

SERVICE MANUAL NUMBER 22
CYLINDER HEAD STUDS
IMPORTANT: All long cylinder head studs are not the same length. Some studs are
longer than others and are used for attaching accessories. These studs must be in
the correct location before exhaust manifold is installed.
When replacing cylinder heads, remove studs and install in new head in same location.
Head gasket thickness is very important on diesel engines. If head gaskets are too
thin, the pistons will hit the valves or heads, causing severe damage. All head
gaskets on one engine must be the same thickness or exhaust manifold and water
manifold will not fit correctly.
When cylinder heads are removed for service but pistons and cylinder liners are not
disturbed, use the same thickness gaskets that were removed. Refer to Head Gasket
Identification.
Refer to Determining Head Gasket Thickness during a complete engine rebuild or when
pistons and liners are being replaced.
90-860074--1 FEBRUARY 2002
a - Long Cylinder Head Studs (Lengths Vary)
a
CAUTION
ENGINE MECHANICAL
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