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Engine Description
The oil pump housing and oil pump gear chambers are machined in the interior of the
accessory case. The oil pump drive gear shaft bore is machined in-line with the camshaft;
the driven gear shaft rests in the bore directly above the drive shaft.
2-3.5.2. Oil Sump
The oil sump assembly is fabricated from a milled aluminum upper body welded to the
shaped sheet metal lower sump section. The upper section features a rib-reinforced
crankcase mounting flange and a boss for the pressed oil gauge rod and extension tube
assembly. The lower oil sump body is fitted with a threaded drain plug boss with safety
wire provisions. The oil gauge rod is marked in quarts to the full mark and features a
locking lever with compression seal.
2-3.5.3. Oil Pressure Relief Valve
A machined, threaded boss is located on the lower right side of the accessory case for
installation of a non-adjustable oil pressure relief valve. Its passages are connected to the
oil pump outlet passage. This valve opens when the oil pump pressure exceeds the
specified operating limit and directs oil back to the oil sump.
2-18
Figure 2-13. Oil Pump
O-200-D & X Series Engine Installation and Operation Manual
3 January 2017
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