Westinghouse WGen12000DF, Service Manual

Westinghouse Outdoor Power Equipment, LLC | 27

MAINTENANCE

SHORT TERM STORAGE

•  Allow the generator to cool a minimum of 30 minutes 

before storage.  

•  If operating on propane, turn the propane tank valve 

to the fully closed position and disconnect the LPG/

propane hose from the generator and propane tank. 

•  Replace all protective covers on the generator control 

panel. 

•  Wipe the generator with a moist cloth. Clean any debris 

from the muffler cooling vents.   

•  Store the generator in a well-ventilated, dry location 

away from sparks, open flames, pilot lights, heat, and 

other sources of ignition such as areas with a spark-

producing electric motor or where power tools are 

operated. 

•  Do not store the generator, gasoline, or propane tanks 

near furnaces, water heaters, or any other appliances 

that produce heat or have automatic ignitions.

•  With the engine and exhaust system cool and all 

surfaces dry, cover the generator to keep out dust. Do 

not use a plastic sheet as a dust cover. Non-porous 

materials trap moisture and promote rust and corrosion. 

LONG TERM STORAGE

Even properly stabilized fuel can leave residue and cause 

corrosion if left long term. If storing the generator for over 

six months, drain the fuel tank.  

DRAINING THE FUEL TANK

If storing the generator for longer than six months, drain 

the fuel tank to prevent fuel separation, deterioration, and 

deposits in the fuel system. 

1. 

Unscrew the fuel tank cap. Remove the fuel screen filter 

by slightly compressing it while removing it from the 

tank. 

2. 

Using a commercially available gasoline hand pump 

(not included), siphon the gasoline from the fuel tank 

into an approved gasoline container. DO NOT use an 

electric pump.  

OR 

Disconnect the fuel line from the bottom of the fuel tank 

and allow the fuel to drain into an approved gasoline 

container. Reinstall the fuel line. 

3. 

Reinstall the fuel screen filter and the fuel tank cap. 

4. 

Start the generator and allow it to run until the generator 

engine stops. 

5. 

Push the battery switch to the OFF position. 

6. 

Disconnect the battery.  

VALVE CLEARANCE

NOTICE

Checking and adjusting valve clearance must be done 

when the engine is cold.

Perform this procedure on both cylinders. 

1. 

Remove the rocker arm cover and carefully remove 

the gasket. If the gasket is torn or damaged, it must be 

replaced.

2. 

Remove the spark plug so the engine can be rotated 

more easily.

3. 

Rotate the engine to Top Dead Center (TDC) by 

momentarily pushing the Start button. Looking through 

the spark plug hole, the piston should be at the top (both 

valves are closed).

4. 

Both the rocker arms should be loose at TDC on the 

compression stroke. If they are not, rotate the engine 

360°.

5. 

Insert a feeler gauge between the rocker arm and the 

valve stem to measure valve clearance.

Intake Valve

Exhaust Valve

Valve Clearance

0.0031 – 0.0047 in 

(0.08 – 0.12 mm)

0.0051 – 0.0067 in 

(0.13 – 0.17 mm)

Torque

8-12 N•m

8-12 N•m

6. 

If an adjustment is necessary, hold the rocker arm pivot 

and loosen the pivot adjusting nut.

7. 

Turn  the  rocker  arm  pivot  to  obtain  the  specified 

clearance. Hold the rocker arm pivot and re-tighten the 

pivot adjusting nut to the specified torque.

Torque: 106 inch-pound (12 N•m)
8. 

Perform this procedure for the other valve.

9. 

Install the gasket, rocker arm cover, and spark plug.