Engine Cooling: Thermostat

Thermostat opens at 178-185°F (81-85°C).

TIGHTENING SPECIFICATIONS

Application

Ft. Lbs. (N.m)

Cylinder Head Bolts

Step 1

14 (20)

Step 2

36 (50)

Step 3

⁽¹⁾ 61 (85)

Main Bearing Carrier

10 mm Bolt

Step 1

14 (20)

Step 2

29-33 (40-45)

12 mm Bolt

Step 1

14 (20)

Step 2

29 (40)

Step 3

44-47 (60-65)

Connecting Rod Nuts

42-46 (58-63)

Camshaft Housing

33 (45)

Flywheel

69-73 (95-100)

Front Pulley

181-188 (250-260)

Camshaft Pulley

33 (45)

Oil Pump

Step 1

11 (15)

Step 2

14-16 (20-22)

Spark Plugs

18-22 (25-30)

Oil Drain Plug

44 (60)

⁽¹⁾	From engine Nos. M28/15-81C and M28/16-81C 639B, tighten to 65 ft. lbs. (90 N.m). Further tightening is unnecessary. On all other engines, allow to stand for 30 minutes after setting Step 3 torque, then loosen 1/4 turn each. Retighten to 61 ft. lbs. (85 N.m).