Mercruiser Big V8 Marine Engine Fastener Torque Spec’s

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454 CID / 7.4L / 502 CID / 8.2L Torque Specifications 

 

DESCRIPTION 

Lb. In.

Lb. Ft.

N.m

Alternator Brace to Alternator

192

 

9

Alternator Brace to Engine

 

30

41

Alternator to Mounting Bracket

 

35

48

Alternator Mounting Bracket

 

30

41

Camshaft Sprocket Gear

 

18

24

Carburetor

132

 

15

Connecting Rod Caps        (3/8-24 Nuts)

                                           (7/16-20 Nuts)

 

50

68

 

73

99

Coupler/Flywheel (MCM)

 

35

48

Crankcase Front Cover

120

 

14

Crankshaft Pulley

 

35

48

Cylinder Head

 

85

115

Distributor Hold Down

 

20

27

Exhaust Manifold

 

30

41

Exhaust Manifold Elbow

 

30

41

Filter Adapter (5/16-18)

 

20

27

Flywheel

 

75

100

Flywheel Drive Plate (MIE)

 

35

48

Flywheel Housing to Block

 

30

41

Flywheel Housing Cover

80

 

9

Front

Mount

Bracket

 

30

41

Fuel Pump

 

25

34

Intake Manifold

 

35

48 (See Note)

Main Bearing Cap

 

110

149

Oil Baffle Nuts

 

25

34

Oil Filter Adapter Nuts

 

40

54

Oil Pan Bolts (5/16-18)

80

 

9

Oil Pan Drain Plug

 

15

20

Oil Pump

 

70

95

Oil Pump Cover

80

 

9

Power Steering Pump Brace to Block

 

30

41

Power Steering Pump Bracket

 

30

41

Rear Mount (MCM)

 

40

54

Rear Mount (MIE)

 

50

68

Remote Oil Connector (1/2 in x 13)

 

25

34

Rocker Arm Cover

90

 

10

Rocker Arm Bolts            7.4L/454

                                         454 Magnum/502

 

40

54

 

45

61

  Note: 7.4L / 454 and 502 MPI engines, Torque intake manifold fasteners to 25-30 Lb. Ft. (34-41 N.m)

 

  454 CID / 74.L / 502 CID / 8.2L Torque Specifications  

 

DESCRIPTION

Lb. Ft. 

N.m

Remote Oil Filter Adapter Nut/Fitting

20

27

Seawater Pump Brace

30

41

Seawater Pump Bracket 

30

41 

Spark Plugs

15

20

Starter Motor

50

68

Thermostat Housing 

30

41

Torsional Damper 

40

54

Transmission To Housing 

50 

68

Water Circulating Pump

35

48 

Water Temperature Sender

20

27 

 


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