Rocker Arm; Removal; Cleaning; Inspection - Mercury MerCruiser D2.8L D-Tronic Service Manual

SERVICE MANUAL NUMBER 22

Rocker Arm

Removal

NOTE: When servicing the rocker arms of only one cylinder, bring that cylinder to TDC
before removing rocker arms. When servicing all rocker arms, bring cylinder number 1
piston up to TDC before removing rocker arms.
1. Remove valve arm covers.
IMPORTANT: Rocker arm assemblies and push rods must be reassembled in their
original locations.
2. Remove rocker arm assemblies and push rods. Place in a numbered rack according to
their position in the engine or label the parts in order for reassembly to the original
location.

Cleaning

1. Wash all parts in cleaning solvent.
2. Dry parts with compressed air.

Inspection

1. Inspect parts for excessive wear, cracks or damage.
2. Using a micrometer, measure outside diameter of rocker arm support journals.
3. Using an inside micrometer, measure inside diameter of rocker arm bushing.
4. Replace rocker arm bushing if difference between bushing inside diameter and journal
outside diameter. is greater than 0.062 mm (.0024 in.).
90-860074--1 FEBRUARY 2002
a - Rocker Arm Support Journal Outside Diameter Measurement - 24.97-25.00 mm
(.9830 - .9842 in.)
a - Rocker Arm Bushing Inside Diameter Measurement - 25.020 - 25.021 mm
(.9850 - .9851 in.)
a
a
ENGINE MECHANICAL
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