TM 9-2320-387-24-l
REFERENCE INFORMATION
COMPRESSION / MECHANICAL
- -I
BAlTERY
STEIICE-R
1. Start Test 67, Battery Voltage.
2. Displayed reading is in volts. Batteries should
be 23-25.5 volts. Batteries voltage will drop
when glow plugs turn on.
STARTER AVERAGE CURRENT
STEIICE-R TEST 71
a peak of over 400
amps.
I
d
The starter circuit tests begin on page 2-247.
Internal engine problems (tight main or rod bearings
for example) or drivetrain problems could still cause
the engine to crank slowly even if the starter and
battery circuits are OK.
0 11
. .
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:
WARNING
Be sure to disconnect fuel
solenoid (wire 54A) to prevent
accidental starting. Failure
to do so may result in injury to
personnel or damage to equipment.
A breaker bar and socket placed on the crankshaft
pulley can be used to try to turn the crankshaft.
The
crankshaft pulley is located directly under the
engine cooling fan. It can be reached from under
the HMMWV.
If the engine won’t turn. remove the glow plugs and
try again. If the engine turns now, try cranking it and
look for fuel at the eight glow plug holes. If you see
fuel at any of the holes, the engine may have had
hydrostatic lock. Crank the engine for about 15
seconds to clear the fuel, re-install the glow plugs
and try to start the engine. If it still won’t crank, notify
DS maintenance (chapter 14).
STARTER FIRST PEAK CURRENT
STUICE-R TEST 72
1. Dtsconnect wire 54A at injection pump to
prevent starting.
2. Disconnect glow plugs controller and fan
solenoid.
3. Start Test 72. Current First Peak.
4. Wait for the GO message. Crank the engine.
5. Result is displayed in amps. Starter first peak
should be over 400 amps.
BAlTERY INTERNAL RESISTANCE
STEIICE-R TEST 73
1. Disconnect wire 54A at injection pump to
prevent starting.
2. Disconnect glow plugs controller and fan
solenoid.
3. Start Test 73. Battery Internal Resistance.
4. Wait for the GO message. Crank the engine.
5. Result is displayed in milliohms. Battery
resistance should be 25 milliohms max.
STARTER CIRCUIT RESISTANCE
STEIICE-R TEST 74
1. Disconnect wire 54A at injection pump to
prevent starting.
2. Disconnect glow plugs controller and fan
solenoid.
3. Start Test 74, Starter Circuit Resistance.
4. Wait for the GO message. Crank the engine.
5. Result is displayed in milliohms. Starter circuit
resistance should be 25 milliohms max.
2-153
