LUBRICATION SYSTEM - TM-5-3895-349-14-P0396

LUBRICATION SYSTEM

SYSTEMS OPERATION

Oil for the rocker arms comes from the oil manifold

will let the oil go around the oil cooler (6) when the oil is

(3) through passages in the cylinder block. The passages

cold or if the restriction in the oil cooler is more than the

in the cylinder block are in alignment with a passage in

other parts of the system. A difference in pressure of 12

each cylinder head.

to 15 psi (0.8 to 1.1 kg/cm2) between the oil inlet and the

oil outlet will open the bypass valve.

The passage to the cylinder head on the left side is

near the front of the cylinder block. The passage to the

There are two pressure outlets in the base for the oil

cylinder head on the right side is near the rear of the

cooler. The pressure outlets are on the outlet side of the

cylinder block.

oil cooler and oil filters. The pressure outlets are for the

sending unit and switch for the oil pressure.

The passage in each cylinder head sends the oil into

an oil hole in the bottom of the mounting surface of the

Oil from the oil filters (12) goes through a passage in

bracket that holds the shaft for the rocker arms. The oil

the cylinder block to oil manifold (3). The oil manifold is in

hole is in the front bracket on the left side and in the rear

the center of the cylinder block above the camshaft and

bracket on the right side. The oil then goes up through

goes the full length of the cylinder block. Oil goes from

the bracket and into the center of the shaft for the rocker

the oil manifold to the bearings for the camshaft. There

arms. Oil goes along the center of the shaft to the

are grooves in the bore in the cylinder block around the

bearings for the rocker arms. From the rocker arms the

bearings for the camshaft.

The bearing surfaces

oil is pushed through small holes to give lubrication to the

(journals) on the camshaft get lubrication from these

valves push rods cam followers and camshaft lobes.

grooves through a hole in the bearings for the camshaft.

After the lubrication oil has done its work it will return to

Some of the oil goes around the grooves and down

the oil pan for the engine.

through a passage to a hole and groove in the top half of

the main bearing. Oil from the hole and groove gives

lubrication to the bearing surfaces (journals) of the

NOTE: On marine engines the location of the oil cooler

crankshaft for the main bearings.

for the marine gear is on top of the flywheel housing.

Oil gets into the crankshaft through holes in the

bearing surfaces (journals) for the main bearings.

Passages connect each bearing surface (journal) for the

main bearing with the bearing surface (journal) for the

connecting rod next to it. The piston pins get lubrication

from oil thrown by other parts.