Generac Power Systems GTH990 User Manual

2-2
SECTION 2: IGNITION
ground stud on engine and re-check. If ignition now has spark, check
wire harness for pinched wires, broken insulation or bad diode (if
equipped). If there is no spark, proceed to Removing Ignition Coil
section.
REMOVING AND INSTALLING WIRE HARNESS:
1. Remove spark plug leads.
2. Remove intake manifold and cover intake ports with a shop
towel.
3. Remove rotating screen and blower housing.
4. Disconnect stop switch wire(s) at ignition coil(s).
5. Reverse order of above to install new wire harness.
REMOVING IGNITION COILS:
The condition of the ignition coils can be accurately diagnosed
using a spark tester (Generac P/N 0C5969) as described in
"TROUBLESHOOTING" Section 1.
1. Remove spark plug leads.
2. Remove intake manifold and cover intake ports with a shop
towel.
3. Remove rotating screen and blower housing.
4. Disconnect ground wire(s) at ignition coil(s).
5. Remove ignition coil screws and remove ignition coil(s). See
Figure 2-5.
Note: The flywheel does not need to be removed to service ignition
except to check the flywheel key.
Figure 2-5. Removing Ignition coil
INSTALL IGNITION COILS:
1. Turn flywheel so magnet is away from ignition coil.
2. Install ground wire onto tab terminal on ignition coil.
Note: Make sure wires are routed over ignition coil mounting posts
and away from flywheel.
3. Assemble ignition coil to engine, Figure 2-6.
a. Mounting holes in ignition coil are slotted. Push ignition coil
away from flywheel as far as possible and tighten screws.
4. Repeat for second ignition coil.
5. See Adjust Ignition Coil Air Gap.
DIODE (BUILT INTO COIL)
DIODE BUILT IN HARNESS
ON OLDER MODELS
IGNITION GROUND WIRE
DIODE (BUILT INTO COIL)
SPARK PLUG
SPARK PLUG
GROUND
WIRE
HARNESS
Figure 2-4. Engine Wiring Harness

Generac Power Systems GTH990 Specifications

General

Brand	Generac Power Systems
Model	GTH990
Category	Engine
Language	English