Mercury MerCruiser D2.8L D-Tronic Service Manual page 261

SERVICE MANUAL NUMBER 22
24. AFTER COMPLETE ENGINE ASSEMBLY AND INSTALLATION, follow these
additional cylinder head angular torque instructions:
a. Operate engine at idle until water temperature reaches 70° C (158° F) and then
b. Remove valve covers.
c. Retorque the cylinder head bolts, as follows:
d. Install valve covers.
Avoid component or engine failure. Cylinder heads require additional angular
torque and conventional torque application after the first 100 hours or first
operating season, whichever occurs first.
25. AFTER 100 HOURS, OR THE FIRST OPERATING SEASON, WHICHEVER OCCURS
FIRST, follow instructions a. - d.:
a. Remove valve covers.
b. In torque sequence and without loosening, tighten the 14mm (center) cylinder head
c. In sequence and without loosening, torque the 12mm (side) cylinder head bolts
d. Install valve covers.
90-860074--1 FEBRUARY 2002
operate engine at 2000 rpm for approximately 20-30 minutes at operating
temperatures. Let the engine cool down completely (inoperative overnight, if
possible).
(1.) n torque sequence, and operating on only one bolt at a time, loosen each 14 mm
(center) bolt and then retorque to 30 N·m (22 lb-ft). Continue by tightening the
bolt through an angle of 65 Degrees and then through ANOTHER 65 Degrees
(130 Degrees total).
(2.) In sequence and without loosening, check torque on port and starboard 12 mm
(side) bolts to be 90 N·m (66 lb-ft)
bolts through an angle of 15 degrees.
through an angle of 15 degrees.
CAUTION
ENGINE MECHANICAL
Page 3A-61