Magnum - Twin Cylinder Torque Values & Sequences for Fasteners

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Magnum - Twin Cylinder Torque Values & Sequences for Fasteners

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Model (Horsepower)		MV16 (16) M18 & MV18 (18) M20 & MV20 (20)
Connecting Rods¹^,²	New	140 in. lbs.
Connecting Rods¹^,²	Used	100 in. lbs.
Spark Plugs		10-15 ft. lbs.
Cylinder Head¹
Flywheel⁵	Screw¹	40 ft. lbs.
Flywheel⁵	Fan	115 in. lbs.
Manifold Screw/Nut		150 in. lbs.
Non Metallic Fuel Pump Mounting Screws		37-45 in. lbs.
Ignition Module		32 in. lbs.
Oil Filter		Snug Plus 1/2 Turn ( 50/80 in. lbs.)
Remote Oil Filter	Lines	65-80 in. lbs.
	Oil Line Flared Nuts	100-120 in. lbs.
	Adapter	125 in. lbs.
	Adapter Fittings	90-130 in. lbs.
	Cover Plate	125 in. lbs.

¹Lubricate fastener threads with engine oil.
²DO NOT overtorque
⁵Flywheel and crankshaft tapers must be clean and dry.

NEW - Component directly from stock.
USED - Component that was in a running engine.

Crankcase: Twin Cylinder Engines

#2 Side Crankcase Half Exterior

#2 Side Crankcase Half Interior

Bolt No.	Torque
1-4	260 in. lbs.
5-6	200 in. lbs.
Torque remaining bolts in most expedient sequence to	200 in. lbs.

Oil Pan (MV16, MV18, MV20)

150 in. lbs.

NOTE: Do not use gasket on MV oil pans.

Cylinder Barrel (All)

Apply sealant to crankcase.*
Preliminary Torque - 100 in. lbs.
Final Torque - 200 in. lbs.
(Engines with 5/16-18 studs)
Final Torque - 360 in. lbs.
(Engines with 3/8-16 studs)

Closure Plate (M18 & M20)150 in. lbs.

*Use a gasket or sealant as
necessary: When reinstalling a
closure plate or cylinder barrels
originally installed with a gasket, use
a new gasket. When reinstalling a
closure plate or cylinder barrels
originally installed with sealant, use
new sealant. When installing a
service replacement closure plate or
cylinder barrels, use new sealant.