Vanguard BIG BLOCK M540000 - Oil Guard Oil Supply Pump - Removal; Oil Pump - Horizontal Shaft Engines - Assembly; Oil Pump - Horizontal Shaft Engines - Disassembly; Oil Pump - Vertical Shaft Engines - Assembly

Oil Pump- Horizontal Shaft Engines - Disassembly
The following procedure applies to horizontal shaft engines.
1. Remove 2 fasteners (A Figure 134) to release oil pump
(B) from crankcase cover (C) .
134
2. Remove o-rings (D) from screws and discard.
Oil Pump - Horizontal Shaft Engines - Assembly
1. Install the oil pump (B, Figure 134) onto the crankcase
cover with new O-rings and seals.
2. Install new O-rings(D) onto the2 oil pump fasteners.
3. Start by hand the 2 oil pump fasteners. Tighten to 90 lb-
in (10.2 Nm).
Oil Pump- Vertical Shaft Engines - Disassembly
The following procedure applies to vertical shaft engines.
1. Remove 4 fasteners (A, Figure 135) to release cover (B)
from crankcase cover (C).
135
2. Remove o-ring (D) from crankcase cover groove. Discard
O-ring.
3. Remove oil intake filter (E) from crankcase cover.
4. Remove 3 fasteners (F) to release oil pump (G) from
crankcase cover.
Oil Pump - Vertical Shaft Engines - Assembly
1. Install the oil pump (G, Figure 135) onto the crankcase
cover, aligning the 3 fastener holes.
2. Start by hand the 3 oil pump fasteners(F).Tighten to 90
lb-in (10.2 Nm).
3. Install the oil intake filter (E) onto the crankcase cover.
4. Install new o-ring (D) into crankcase cover groove.
5. Install the cover (B) onto the crankcase cover.
6. Start by hand the 4 cover fasteners. Tighten to 90 lb-in
(10.2 Nm).
Optional Oil Guard System - Disassembly
Oil Guard Oil Supply Pump - Removal
Remove the oil supply pump from the crankcase cover as
follows:
107