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Manual Generac QT08054KNANA Generator

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Manual

5.4L & 6.8L IGNITION DESCRIPTION

This single-fire Ignition is intended to operate with

a 10-cylinder, 6.8L engine and an 8-cylinder, 5.4L

engine.

The 6.8L engine uses a 40-1 crank sensor, a mag-

pickup CAM sensor and individual coil-on-plug coils

for each spark-plug.

The 5.4L engine uses a 36-1 crank sensor, a mag-

pick-up CAM sensor and individual coil-on-plug coils

for each spark-plug.

With a single-fire ignition, each high-voltage coil out-

put is connected to one spark plug resulting in that

spark plug being fired only during the compression

cycle.

Engine Timing versus Engine Speed for the 6.8L

engine is:

RPM NG/LP Engine Timing (BTDC)

1800 rpm 22 degrees

3600 rpm 24 degrees

Engine Timing versus Engine Speed for the 5.4L

engine is:

RPM NG/LP Engine Timing (BTDC)

1800 rpm 26 degrees

3600 rpm 26 degrees

IGNITION POWER-UP INPUT ("56 LINE 

INPUT")

When battery voltage is applied to this input the igni-

tion will power-up. For the ignition to power itself

down, battery voltage must be removed from this

input.

IGNITION ENABLE ("14 LINE INPUT") 

This input must be connected to the +12V battery for

the ignition to turn-on the coils. If this input is con-

nected to battery ground the ignition will stop firing

the coils and will power down within approximately

2 seconds. In the event that an ignition fault has

occurred, however, the ignition will wait 60 seconds

before powering down. This allows time to view the

diagnostic LED located on the ignition board.

NOTE:

The ignition cover does not need to be removed to

see the LED.

IGNITION SHUTDOWN ON LOSS OF CRANK 

OR CAM SIGNALS

The ignition will stop firing the coils immediately fol-

lowing the loss of the crank signal. The ignition will

stop firing the coils after approx. 3 seconds following

the loss of the cam signal.

DIAGNOSTIC BLINK PATTERNS (RED LED 

LOCATED ON THE IGNITION CONTROL

BOARD)

During normal ignition operation the RED LED

flashes at a 0.5 sec ON and a 0.5 sec OFF rate. This

is considered one (1) blink.

LED Fault Code with Priority as shown:

1. No Crank Signal: LED blinks 2 times, is OFF for

3.0 seconds and then repeats

2. No CAM Signal: LED blinks 3 times, is OFF for

3.0 seconds and then repeats

Only one fault is displayed at a time. If multiple faults

exist then the highest priority fault must be resolved

prior to a lower priority fault being displayed. In the

event that an ignition fault has occurred the ignition

will wait 60 seconds before powering down.

NOTE:

The ignition cover does not need to be removed to

see the LED.

6-3

Stationary Emergency Generator

Specifications

GenSpec025 Rev. A 10/08

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