FOR MODELS: JGW, JGR AND JGJ SECTION 5 - MAINTENANCE
1/01 PAGE 5 - 15
Lube Oil Pump Chain Sprocket Replacement
1. Refer to Figure 5-9:.
2. Remove all piping from the pump. Remove fasteners from pump mounting
flange and the pump with sprocket will come free through the hole in the end
cover after the removal of the chain.
3. With a good machinist rule, measure the exact distance from the sprocket drive
face to the pump mounting flange face, in order to position the new sprocket.
Note this measurement for future reference.
4. With the oil pump on a bench, use an Allen Wrench to remove the sprocket set
screws; then, pull the sprocket from its shaft.
5. Remove the Woodruff No. 204 or square key, 3/16 x 1 inches (4.8 x 25 mm)
long, from the shaft and file the shaft to smooth out any burrs raised by the cup
point of the set screw.
6. Install a new key, a No. 204 Woodruff for 2-throw units or a square 3/16 x 1
inches (4.8 x 25 mm) long for 4 and 6-throw units, after first checking to make
sure the key will fit into the new sprocket. If the key is too thick, it can be pol-
ished with an emery cloth on a flat surface until it can easily slide into the notch.
If may also be a little high and require filing of the top edge.
7. Install a new sprocket to the original measurement between the sprocket drive
face and the pump mounting flange face. When it is in position, tighten the set
screws.
8. Install new gaskets. Before reinstalling the pump, apply an anti-seize lubricant to
the gasket surfaces. This will aid in easy removal at a later date.
9. Reinstall the pump onto the end cover. Check the alignment to crankshaft drive
sprocket, with crankshaft centered in end play, using a straight edge to within 1/
32 inch (1 mm). If not in alignment, adjust sprocket position as necessary.
FIGURE 5-8: ECCENTRIC VERNIER - CHAIN IDLER SPROCKET (SELF-ALIGNING SPROCKET) - TYPICAL
Oil O-Ring
Before
Assembly
Sprocket
Locknut
Capscrew (2)
Stat-O-Seal
Washer
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