Proheat X45–School Bus - Manual (Page 70)

5-13 SECTION 5. TROUBLESHOOTING & REPAIR
Ignition System
Check: Ignition Coil and Electrode Gap
a) Electrode cleanliness.
b) Electrode positioning for proper gap.
Test Procedure — Ignition System and Electrode Spark Inspection:
a) Inspect high tension lead between the coil and the electrode.
Ensure that there is a proper connection at both the coil
(positive and negative terminals) and at the electrode.
If the high tension lead is cut or damaged, replace.
b) Remove three (3) bolts from the fan end and open up heater.
c) Check the electrode for carbon buildup and clean as required.
d) Check electrode gap as per Figure 5-13.
e) Reinstall fan end and torque three (3) bolts to 75±5 in/lbs
(8.5±0.5 Nm).
WARNING
The PROHEAT chassis is grounded to
the PCM as shown in Figure 5-14.
Ensure that the ground is securely
connected. Failure to ensure a
proper ground may result in
electrical shock.
Figure 5-13 Electrode Gap Detail
COMBUSTOR
TUBE
ELECTRODE
1/4" - 9/32"
Figure 5-14 PROHEAT Ground Boss
CHASSIS GROUND BOSS
GROUND WIRE
FROM PCM