Service manual

181 CID (3.0L) 4 CYLINDER GM ENGINE
SERVICE MANUAL NUMBER 26
90-861329--1 MARCH 1999 Page 3A-35
Oil Pump
The oil pump consists of two gears and a pressure regulator valve enclosed in a two-piece
housing. Oil pump is driven by distributor shaft which is driven by a helical gear on camshaft.
Removal
1. Remove oil pan as previously outlined.
2. Remove gasket carefully as the one-piece gasket for the oil pan may be reused if still
pliable and not cracked, torn, etc.
3. Remove oil pump.
76234
a
a-Oil Pump
Disassembly
1. Remove pump cover.
IMPORTANT: Mark gear teeth for reassembly with same teeth indexing.
2. Remove idler gear and drive gear from pump body.
3. Remove retaining pin, spring, and pressure regulator valve from pump cover.
IMPORTANT: Do not remove pickup screen and pipe assembly, unless replacement
is necessary. Loss of press fit condition could result in an air leak and loss of oil pres-
sure.
IMPORTANT: Do not disturb pickup screen on pipe. This is serviced as an assembly.
4. If pickup screen and pipe assembly requires replacement, mount pump in a soft-jawed
vise and extract pipe from pump.
Index