Mercury MerCruiser D2.8L D-Tronic Service Manual page 269

SERVICE MANUAL NUMBER 22
TORQUE PROCEDURE AFTER 20-30 MINUTE BREAK-IN
Avoid component or engine failure. Cylinder heads require additional angular
torque and conventional torque application after the first 20-30 minute break-in.
1. Operate the engine at idle until water temperature reaches 70 degrees C (158
degrees F.). Then operate the engine at 2000 rpm for approximately 20-30 minutes
at normal operating temperature.
2. Let the engine cool down completely (inoperative overnight, if possible).
3. One at a time loosen each center bolt and torque as indicated in a. and b.
a. First pass:
D2.8L Center Bolts
D4.2L Center Bolts
b. Second pass:
D2.8L Center Bolts
D4.2L Center Bolts
D2.8L D-Tronic Center Bolt Torque Sequence Diagram
D4.2L D-Tronic Center Bolt Torque Sequence Diagram
90-860074--1 FEBRUARY 2002
Engine
Engine
a
1
a
14
a - Center Bolt Set
CAUTION
Sequence
3-2-1-4-5-8-9-10-7-6
11-12-13-14-10-9-8-4-3-2-1-5-6-7
Sequence
3-2-1-4-5-8-9-10-7-6
11-12-13-14-10-9-8-4-3-2-1-5-6-7
1 3
9
10
2 8
13 3 11
2 12 4
ENGINE MECHANICAL
Torque
30 NM (22 lb-ft)
30 NM (22 lb-ft)
Torque Angle
+ 120 Degrees
+ 120 Degrees
7 5
6
4
5 9
7
8
10 6
77114
77113
Page 3A-69