Valve Push Rods; Removal; Cleaning; Inspection - Mercury MerCruiser D2.8L D-Tronic Service Manual

SERVICE MANUAL NUMBER 22

Valve Push Rods

Removal

1. As previously outlined, remove valve covers.
IMPORTANT: Keep rocker arms, rocker arm components, valve push rod and
hydraulic lifter from each valve together as a matched set. Mark or store them so they
can be reinstalled in the same location later.
2. Remove rocker arm assemblies.
3. Lift push rod from seat in lifter cup.

Cleaning

1. Clean all parts with solvent.
2. Clean oil passages of old oil and sludge.
3. Dry parts with compressed air.

Inspection

1. Inspect all contact surfaces (spherical tips) for wear.
2. Check run-out (straightness) of each push rod.
3. Replace all damaged or worn parts.

Installation

IMPORTANT: When installing lifters and rocker arms, coat rocker arm bearing
surface, rocker arm and push rod ball and seat with engine oil.
1. Install push rods in order of removal. Ensure push rods seat in lifter socket.
2. Install rocker arm assemblies. Torque nuts to 34 Nm (25 lb-ft).
3. Install rocker arm covers using new gaskets, and new O-rings on the 6 Cylinder's
connector piece between the valve covers. Torque screws to 11.5 Nm (101 lb-in.).
90-860074--1 FEBRUARY 2002
ENGINE MECHANICAL
Page 3A-105