Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Fig. 49 Oil pump. V8-454
Disassembly, Inspection & Assembly
1.
Remove oil pump as described previously.
2.
Remove pump cover screws and pump cover, Figs. 47 through 49. On 6-250 and 292 engines, remove pump cover gasket.
3.
Mark gear teeth so they can be reassembled with same teeth indexing, then remove drive gear, idler gear and shaft.
4.
Remove pressure regulator valve retaining pin, pressure regulator valve and related parts.
5.
If pickup screen and pipe require replacement, mount pump in a soft-jawed vise and extract pipe from pump.
6.
Wash all parts in cleaning solvent and dry with compressed air.
7.
Inspect pump body and cover for cracks and excessive wear.
8.
Inspect pump gears for damage or excessive wear.
9.
Check drive gear shaft for looseness in pump body.
10.
Inspect inside of pump cover for wear that would allow oil to leak past the ends of the gears.
11.
Inspect pickup screen and pipe assembly for damage to screen, pipe or relief grommet.
12.
Check pressure regulator valve for proper fit in pump housing.
13.
Reverse procedure to assemble. Turn driveshaft by hand to check for smooth operation. The pump gears and body are not serviced separately.
If the pump gears or body are damaged or worn, the pump assembly should be replaced. Also, if the pickup screen was removed, it should
be replaced with a new one as loss of the press fit condition could result in an air leak and loss of oil pressure.
