TM-5-3805-254-14-P-2

TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)

TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)

JUNE 1980

TM-5-3805-254-14-P-2 - Page 497 of 894

TRUCK SERVICE MANUAL

FUEL SYSTEM

PT (type D) Injector Trouble Shooting The following list

of problems is of importance when trouble shooting PT

(type D) injectors:

Check 1 - Unable To Get Correct Plunger To Cup

Alignment

Cause

Defective or dirty cup.

Improper assembly techniques.

Defective plunger.

Defective barrel face surfaces.

Damaged retainer cup seating shoulder or threads.

Improper interpretation of cup alignment.

Check 2 - Defective Barrel To Adapter Seal

Cause

Gasket, when required, torn or creased at time of

assembly.

Adapter or barrel face damaged.

Roll pins or spiral pins damaged, preventing barrel and

gasket from seating properly.

Check 3 - Fuel Leaking Around Retainer

Cause

Barrel cracked.

Leaking barrel plugs.

Defective barrel to cup seal.

Check 4 - Plunger Sticks Or Scuffed

Cause

Cup to plunger misalignment.

(c) Close the hydraulic valve while the load cell is

clamped in position and turn the timing wheel

slowly by hand.

(d) If the load cell indicates more than 50 lbs.

[22.7

kg] increase above the clamping load, the cam

and/or shaft and/or cam follower must be

replaced.

Correction

Test cup spray pattern on ST-668.

Clean, inspect and

repair.

Assemble with correct tools and procedure.

Clean and inspect.

Clean, inspect and repair.

If damaged areas cannot be cleaned up, replace part.

Check cup to plunger alignment.

Correction

Install new gasket each time barrel is removed from

adapter on 5/16 inch [7.94 mm] type injectors.

All 3/8

inch [9.52 mm] type injectors built after January, 1969 do

not require gasket.

Lap surface.

Inspect and replace if interference occurs.

Correction

Inspect and replace with barrel plunger assembly.

Stake plugs with punch.

Lap surface.

Correction

Assemble correctly.

492