A—Oil Pressure Relief Valve
B—Relief Valve Spring
C—Oil Pump
E—Oil Pump Gear
F—Lower Balancer Link
H—Oil Return Passage
I—Breather Passage
J—Upper Balancer Link
K—Crankshaft Ball Bearing
L—Connecting Rod Journal
M—Connecting Rod Passage
N—Camshaft Bearing
O—Crankshaft Main Bearing
P—Oil Pressure Switch
Q—Oil Filter
R—Pressure Oil
S—Pressure-Free Oil
T—Oil/Air Mixture

Lubricate internal engine parts.

Major Components:
• Screen
• Oil pump
• Oil pressure relief valve
• Low oil pressure switch
• Oil filter with bypass
• Internal oil passages

Theory of Operation:

A positive displacement gerotor pump is used to pressurize the lubrication system. The oil pump is driven directly off the crankshaft gear. The lubrication system is protected by an oil pressure relief valve, low oil pressure switch, and an oil filter with bypass.

The oil pump (C) draws pressure free oil (S) from the sump through screen (D). Pressure oil (R) from the pump flows through the pump outlet passage past the oil pressure relief valve (A). The oil pressure relief valve limits the oil pressure to approximately 296 kPa (43 psi) and protects the oil pump from damage if an oil passage becomes blocked. If oil pressure exceeds 296 kPa (43 psi), the relief valve opens allowing oil to return to sump. Relief valve is not adjustable.

Pressure oil from the pump outlet passage flows to the oil filter (Q). The filter contains a bypass valve which opens if the element becomes plugged to insure engine lubrication. An oil pressure switch (P) mounted in the oil filter manifold turns on a warning light if oil pressure is below 28 kPa (4 psi). Filtered pressure oil flows through a passage in the oil sump to the crankshaft main bearing (PTO side) (O) and then to the camshaft bearing (N). Drilled passages in the crankshaft distribute oil from the main bearing to the lower balancer link (F), connecting rod journal (L), upper balancer link (J), and crankshaft ball bearing (flywheel side) (K). A drilled passage (M) in the connecting rod allows oil from the connecting rod journal to lubricate the piston and cylinder. Pressure-free oil flowing out of the crankshaft ball bearing or upper balancer link also lubricates the balancer (G). A drilled passage in the top of the balancer allows oil to flow to the support shaft and balancer bushing.

The rocker arms, valves, and pushrods are lubricated by an oil/air mixture (T) and carried to the rocker arm cover through the breather passage (I). The breather passage is located directly above the upper pushrod. The oil from the oil/air mixture is separated from the air through the breather maze and flows to the bottom of the cylinder head. This oil drains back to sump through an oil return passage (H) located in the bottom of the cylinder block directly under the lower pushrod.

26. August 2021 by samuel07042012
Categories: F510-F525 | Leave a comment

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