7-5. Servicing Engine Lubrication And Fuel Systems
8
YStop engine and let cool.
1Oil Filter
2Oil Drain Valve
31/2 ID x 12 in Hose
4Fuel Line
5Primary Fuel Filter
6Secondary Fuel Filter
7Petcock
8Fuel Tank Sludge Drain
To change oil and filter:
Pull oil drain hose through access hole in base. Change engine oil and filter according to instructions in engine manual.
YClose valve and valve cap before ad- ding oil and running engine.
Fill crankcase with new oil to full mark on dipstick (see Section
1
3
2
To drain water from fuel system:
Open secondary fuel filter petcock and drain water into metal container. Close pet- cock when
To change fuel filters:
Install new primary fuel filter as shown.
Replace secondary fuel filter according to engine manual.
Replace fuel lines if cracked or worn.
Wipe up any spilled fuel.
YAfter servicing, start engine and check for fuel leaks.
Stop engine, tighten connections as necessary, and wipe up fuel.
4
FLOW5
4
6
7 
Tools Needed:
9/16 in
Ref. 189
To change coolant:
Change coolant according to engine manu- al.
Run engine until engine reaches normal op- erating temperature. Loosen air bleed screw to remove air from cooling system. Tighten screw.
Check coolant level in recovery tank. Add coolant if necessary.
To drain sludge from fuel tank:
Put metal container under drain, and re- move sludge drain plug. Reinstall plug when done.