TM 9-2350-256-20-1
UNIT MAINTENANCE
RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
NSN 2350-00-122-6826, EIC AQA
OIL COOLING SYSTEM TROUBLESHOOTING PROCEDURE
INITIAL SETUP:
Tools and Special Tools
References (cont.)
Tool kit, general mechanic's (item 59, WP 0490 00)
Cleaner, oil cooler (item 138, WP 0488 00)
Gage, pressure (item 156, WP 0488 00)
WP 0171 00
Personnel Required
WP 0342 00
Mechanics (2)
WP 0345 00
References
TM 9-2350-256-10
Troubleshooting Procedure
Oil Cooling System
Symptom
Oil cooling system malfunctioning.
Malfunction
Low engine oil pressure, engine oil temperature normal. Do steps 1 thru 4.
High engine oil pressure, engine oil temperature normal. Do steps 1 thru 5.
Engine oil consumption excessive.
Do step 6.
High engine oil temperature. Do steps 7 thru 11.
CORRECTIVE ACTION
1.
Check to see that proper grade of oil for prevailing temperature is used in engine. If improper grade
was used, refill with proper grade of oil (refer to TM 9-2350-256-10).
2.
Check main engine crank case for proper oil level. Refer to TM 9-2350-256-10 instructions on
checking engine oil level. Check that oil is not diluted. Drain and refill if oil is diluted (refer to TM
9-2350-256-10).
3.
Remove left- and center-front air inlet grilles (see WP 0342 00) and open side air inlet grille doors.
Inspect oil lines for evidence of leaking. Tighten or replace any lines or connections that are leaking.
Check oil drain valve plug (see WP 0104 00). If valve plug is loose, tighten and recheck oil pressure. If
oil pressure is low, do to step 4. If oil pressure is high, go to step 5.
CAUTION
Be sure to use the proper pressure gage for the pressure range to be tested.
4.
Remove left- and center-front air inlet grilles (see WP 0342 00) if they have not already been removed.
Remove main engine oil pressure switch (see WP 0171 00) and install pressure gage (item 156, WP
0488 00). If pressure gage reads 4070 psi (276483 kPa) at 2400 rpm and engine oil pressure gage
0024 00-1
