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 TM 9-2815-220-24
ENGINE CRANKS TOO SLOW
THIS WORK PACKAGE COVERS:
Troubleshooting Table and Diagnostic Tests
INITIAL SETUP:
Tools:
Personnel Required
General mechanic's tool kit (item 121, WP 0176)
Track Vehicle Repairer (2) 63H10
Equipment Conditions:
Engine installed in vehicle or ground hop.
MALFUNCTION 1:
Cranking speed too slow for starting: (below 90 rpm).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Batteries partially discharged.
(1) Check battery condition:
PROCEDURE
OBSERVATION
ANALYSIS
Indicator (Battery/Generator) Preliminary Check
Master switch "OFF".
Indicator needle at extreme left (no
Indicator satisfactory.
voltage indicated).
Indicator needle at any position other than
Indicator defective.
extreme left.
Indicator satisfactory.
Turn master switch
Indicator needle moves into "yellow" area
"ON".
(indicating battery voltage) with panel
lights on.
Indicator needle does not move from
Indicator defective.
extreme left position with panel lights on.
Battery Preliminary Check
Turn master switch
Indicator needle in "yellow" area.
Battery charge
"ON".
satisfactory.
Indicator needle in left "red" area.
Batteries discharged.
Indicator needle in "green" area.
Batteries overcharged.
Indicator needle at extreme left position.
Batteries dead or cables
disconnected or
corroded.
PROBABLE CAUSE
CORRECTIVE ACTION
b. Incorrect seasonal grade of oil. Applies in
(1) Drain and refill with proper oil (refer to
cold weather.
pertinent vehicle lubrication order).
END OF WORK PACKAGE
WP 0007 00-1 (2 blank)
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