FE290 ENGINE
General Information
2000 FE290 Gasoline Vehicle Maintenance and Service Supplement Page 13-5
13
The pump (3) draws oil from the sump (1) and forces it under pressure into the crankcase passages as
shown (Figure 13-1, Page 13-6 and Figure13-2, Page 13-6). Oil can build up excess pressure in a lubrica-
tion system. To prevent build-up of excess oil pressure which could possibly force oil past the seals and
damage the engine, the pump is fitted with a pressure relief valve (8) (Figure 13-1, Page 13-6) that is made
of a ball and a spring. When the pressure increases beyond the pressure of the spring, the ball is forced off
its seat against the spring pressure and excess oil is routed back into the sump (crankcase), thus relieving
the pressure. When the pressure drops below the preset limit, the spring holds the ball against its seat to
keep the oil from draining back into the sump (crankcase). Excess oil pressure could otherwise force the oil
past seals and cause engine damage.
Figure 13-1 Cutaway View of Crankcase
Figure 13-2 Lubrication System
Figure 13-3 Lubrication System Flow Chart
3
8
2
4
4
1
5
9
9
8
11
10
12
13
3
7
2
6
(1) Oil Sump
(2) Oil Filter
Screen
(3) Oil Pump
(5) Oil Filter
(4) Camshaft
Bearing
(6) Passage
(7) Passage
(9) Tappet
(10) Crankshaft
Main Bearing
(9) Tappet
(11) Link Rod
Bearing
(12) Connecting
Rod Bearing
(13) Link Rod
Bearing
(8) Pressure
Relief Valve