Engine Maintenance; Adjust Valve Lash - Rheem GEN20AD-E Operator's Manual

Engine Maintenance

WARNING Unintentional sparking could cause fire or electric
shock resulting in death or serious injury.
WHEN ADJUSTING OR MAKING REPAIRS TO YOUR GENERATOR
Disconnect the spark plug wire from the spark plug and place
the wire where it cannot contact spark plug.
WHEN TESTING FOR ENGINE SPARK
Use approved spark plug tester.
DO NOT check for spark with spark plug removed.
When all engine servicing is complete, replace 15 Amp fuse
in control board and reset exercise timer.

Adjust Valve Lash

1. Valve lash adjustment must be performed on a COLD
engine
2. Remove both spark plugs to ease manual rotation of
engine crankshaft.
3. Access to rotate the engine by hand is available by:
a. Removing the engine intake screen in the battery
compartment such that the crankshaft nut is accessible.
Care must be taken when reassembling this screen
using the self tapping screws as over-torqueing will
strip out the partition material.
b. OR remove the front alternator outlet air scoop by
removing the four screws that secure it. The crankshaft
may be rotated via the aluminum alternator fan. Care
should be taken not to damage the fan, and to reinstall
the alternator outlet air scoop in the proper orientation.
4. Set the No. 1 cylinder at ¼" (6mm) past Top Dead
Center (TDC) on the compression stroke.
5. Using a feeler gage (A), measure the valve clearance.
6. The proper valve clearance is .005" (0.13mm) for both
the intake and exhaust.
7. Adjust the clearance by loosening the lock nut (B), then
turn the adjusting screw (C).
8. Once the clearance is properly set, hold the adjusting
screw while torqueing the lock nut to 70 in-lbs (8Nm)
9. Repeat for cylinder No. 2
A
fa fa
the pro the p
(6mm) pas (6mm) past
pression s pression stro
, measure t , measure t valve cleara lve cleara
ce is .0 ce is " (0.13mm) (0.13mm both both
ng the loc ng th nut (B B ), then nut ( ), th
d the adjust d the adjus
0 in-lbs 0 in-
B
C
Engine Oil
The engine is filled with synthetic oil (API SJ/CF 5W-30).
This allows for system operation in the widest range of
temperature and climate conditions.
We recommend the use of Briggs & Stratton Warranty
Certified oils for best performance. Other high-quality
detergent oils are acceptable if classified for service SJ or
higher. DO NOT use special additives.
Outdoor temperatures determine the proper oil viscosity for
the engine. Use the chart to select the best viscosity for the
outdoor temperature range expected.
NOTICE Synthetic oil meeting ILSAC GF-2, API
certification mark and API service symbol with "SJ/
CF ENERGY CONSERVING" or higher, is an
acceptable oil at all temperatures. Use of synthetic
oil does not alter required oil change intervals.
* Below 40°F (4°C) the use of SAE 30 will result in hard starting. elow 40°F (4°C low 40°F (4
** Above 80°F (27°C) the use of 10W30 may cause increased oil ** * Above 80° Above
consu consum consumption. Check oil level more frequently.
Changing Engine Oil and Oil Filter
Open roof and remove front panel to access the oil filter and
to add engine oil.
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