Maintaining The Spark Plugs; Valve Clearance Adjustment; Check Valve Clearance; Adjust Valve Clearance - Generac Power Systems 15 kW EcoGen Owner's Manual

Maintaining the Spark Plugs

Check and replace the spark plugs as necessary.
WARNING
Electrical shock. Do not disconnect spark
plug wires with engine running. Doing so
could result in death or serious injury.
WARNING
Moving Parts. Avoid AVR fan housing for one
hour after generator shutdown. Fan operates
even if fuse is removed. Rotating fan blades
could result in death or serious injury.
WARNING
Electric shock. AVR maintains electrical
charge after generator shutdown. Wait five
minutes before AVR removal. Failure to do
so could result in death or serious injury.
1. With the generator shut down, lift the lid and
remove the front panel.
2. See "A" in Figure
AVR filter housing from back panel.
3. Remove spark plug cables from spark plug terminals.
4. Clean the area around the base of the spark plugs
to keep dirt and debris out of the engine.
5. Remove the spark plugs and check the condition.
Install new plugs if the old spark plugs are worn or
if reuse is questionable.
6. Clean the spark plugs by scraping or washing with
a wire brush and commercial solvent. Do not blast
the spark plugs to clean.
7. See Figure 4-14. Check spark plug gap using a
wire feeler gauge. Replace the spark plug if the
gap is not within specification as provided in
Section 2 — Specifications.
Figure 4-14. Checking Spark Plug Gap
8. Reattach spark plug cables to spark plug terminals.
9. Install AVR filter housing.
10. Install front panel and lower the generator lid.
Owner's Manual for 60 Hz EcoGen™ Generator
(000140)
(000222)
(000223)
4-12. Remove screw to release
000211

Valve Clearance Adjustment

Check the valve clearance after the first 25 hours of
operation, then after 500 hour intervals. Adjust if
necessary.
Important: Please contact an Independent Authorized
Service Dealer for service assistance. This is a very
important step in prolonging engine life.

Check Valve Clearance

1. The engine should be cool before checking.
Adjustment is not needed if valve clearance is
within the specification
Specifications.
2. Remove spark plug wires and position wires away
from plugs.
3. Remove spark plugs.
4. Make sure the piston is at top dead center (TDC) of
its compression stroke (both valves closed). To get
the piston at TDC, remove the intake screen at the
front of the engine to gain access to the flywheel
nut. Use a large socket and socket wrench to
rotate the nut and hence the engine in a clockwise
direction. While watching the piston through the
spark plug hole. The piston should move up and
down. The piston is at TDC when it is at its highest
point of travel.

Adjust Valve Clearance

A
D
Figure 4-15. Valve Clearance Adjustment
See Figure 4-15:
1. The engine should be cool before adjustment.
2. Remove spark plug wires and position wires away
from plugs.
3. Remove spark plugs.
4. Remove the four screws attaching the valve cover.
Remove and discard gasket.
5. Loosen the rocker jam nut (A) using a 10mm Allen
or 13mm Allen wrench.
Maintenance
in Section 2 —
C
000602
27