TB-9-2300-378-14
M48 & M60 SERIES VEHICLES
TECHNICAL BULLETIN; AIR INDUCTION SYSTEM MAINTENANCE
SEPTEMBER 1985
TB-9-2300-378-14 - Page 136 of 296
TB 9-2300-378-14
Table 6-3. Improved Clean Air Induction System Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
VEHICLE EXHAUST DUST EJECTOR SYSTEM (VEDES)
1.
AIR CLEANER FILTER ELEMENTS REQUIRE CLEANING TOO OFTEN, ACCOMPANIED
BY:
A.
EXCESSIVELY DIRTY ELEMENT
Step 1.
Inspect exhaust protector cap for free action or damage. Repair or replace
as necessary.
Step 2.
Inspect precleaned and dust scavenge sections of air cleaner through
inspection holes for plugging from dust, mud, or snow. Clean out as
required.
Step 3.
Inspect scavenge tubes and hoses for loose clamps, holes, or cracks.
a. Tighten or replace clamps as required (para. 6-16a).
b.
Replace tubes or hoses as required (para. 6-16a).
Step 4.
Inspect check valve for free action.
Replace as necessary (para. 6-16 b).
B.
LOW POWER AND EXCESSIVE BLACK EXHAUST SMOKE
Step 1.
Inspect air intake at turret bulkhead for clogging or restriction. Clean out
as necessary.
Step 2.
Inspect air cleaner intake hose for collapsed condition. Replace as
necessary (para. 6-9).
Step 3.
Inspect engine intake manifold for leaks.
Notify direct support to repair or
replace.
2.
SOOT AND/OR MOISTURE ON FILTER ELEMENT AND/OR DARK COLORED WATER OR
MUD IN SCAVENGE TUBE OR CHECK VALVE.
Step 1.
Inspect exhaust protector cap for free action or damage. Repair or replace
as necessary (TM 20-1).
Step 2.
Inspect check valve for free action.
Replace as necessary (para. 6-16b).
3.
HIGH FILTER CLOG INDICATOR READING DURING HEAVY SNOW OPERATION
ACCOMPANIED BY LOW POWER AND EXCESSIVE BLACK EXHAUST SMOKE
Inspect for heavy snow or ice accumulations in air cleaner filter compartment and
precleaned dust scavenge sections.
4.
NO FILTER CLOG INDICATOR READING ACCOMPANIED BY LOW POWER AND
EXCESSIVE BLACK EXHAUST SMOKE.
Step 1.
Inspect and clean filter.
Step 2.
Start engine and look for reduction in exhaust smoke.
Step 3.
If a reduction in exhaust smoke occurs replace filter clog indicator; if not
notify direct support maintenance.
5.
ENGINE REVERSAL: VEHICLE HAS STALLED AND ROLLED BACKWARD DOWN AN
INCLINE WITH TRANSMISSION IN A FORWARD GEAR
Inspect insides of both air cleaner filter elements.
Replace element if charring, soot, fuel,
or burn holes are found inside, or if element seals show signs of excessive heat (para. 6-15).
6-14
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