Inspection - Mercury MerCruiser D2.8L D-Tronic Service Manual

ENGINE MECHANICAL

Inspection

1. Measure camshaft shaft run-out.
2. Measure lobe lift. If lobe lift is less than specified limit, the camshaft must be replaced.
3. Measure camshaft journal dimensions.
4. Inspect camshaft bearings. Replace as needed. Refer to Camshaft Bearings.
5. Inspect valve lifters and push rods. Replace if needed.
IMPORTANT: Camshaft gear is a press-fit on shaft. If removal is needed, upon reassembly
gear must be heated in an oven to 180-200 degrees C (360-390 degrees F.) and pressed
on the shaft. After installing proper thrust plate and positioning the key, press the gear
until gear is tight against shoulder.
6. Measure clearance between thrust plate and camshaft. Camshaft assembly Clearance
should be 0.030-0.095 mm (.0012-.0037 in.). Wear limit is 0.200 mm (.0078 in.).
If measured value exceeds specification inspect thrust plate thickness at four opposite
points. Replace plate if less than specified at any point.
Page 3A-98
a - Measurement: Greater Than 3.95-4.05 mm (.1555-.1594 in.)
b - Thickness Dimension At Four Opposite Points
b
SERVICE MANUAL NUMBER 22
a
70357
90-860074--1 FEBRUARY 2002