Rocker Arm; Valve Adjustment; Valve; Valve Seat - Mercury MerCruiser D2.8L D-Tronic Service Manual

SERVICE MANUAL NUMBER 22
Engine Specifications (continued)

Rocker Arm

Valve Adjustment

Valve

Valve Seat

90-860074--1 FEBRUARY 2002
Description
Journal Diameter
Bushing lnner Diameter
Maximum Clearance
Valve
Clearance
Valve
Head Diameter
Stem Diameter
Face Width
Margin (New)
Margin (After Grinding)
Face Angle (New)
Valve
Seat Angle
Seat Width
Seat Outer Diameter
Seat Height
Head SurfaceTo Seat
Valve Recession (Max.)
NOTICE
UNIT OF MEASUREMENT: mm (in.)
Exhaust
Hydraulically Controlled
Exhaust
38 (1.49)
7.93 (.3122)
2.64 - 2.99 (.1039 - .1177) 3.57 - 3.85 (.1405 - .1515)
1.73 (.068)
44 degrees 30 minutes
Exhaust
45 degrees
2.00 (.078)
39 (1.53)
7.90 (.311)
2.05 - 2.25 (.080 - .088)
0.03 (.001)
ENGINE MECHANICAL
Measurement
24.97 - 25.00 (.983 - .984)
25.021 - 25.020 (.985 - .985)
0.062 (.002)
Intake
Intake
40.9 (1.61)
7.95 (.3129)
1.82 (.071)
1.30 (.051)
29 degrees 30 minutes
Intake
30 degrees
3.25 (.127)
42 (1.653)
7.80 (.307)
2.17 - 2.37 (.085 - .093)
0.03 (.001)
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