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TM 10-3930-638-24&P
3-4. FUEL SYSTEM TROUBLESHOOTING (cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7. ENGINE DOES NOT DEVELOP FULL POWER OR SPEED (cont)
Step 12. Disassemble fuel injection pump and check transfer pump parts for wear or damage (para 4-3b; notify
general support maintenance).
a. If transfer pump parts are worn or damaged, replace (para 4-3b).
b. If transfer pump parts check okay, proceed to step 13.
Step 13. Check fuel injection pump maximum fuel setting on test set-up (para 4-3b; notify general support
maintenance).
a. If fuel injection pump maximum fuel setting is not correct, adjust (para 4-3b).
b. If fuel injection pump maximum fuel setting is okay, proceed to step 14.
Step 14. Remove delivery valve and inspect for dirt or improper installation (para 4-3b; notify general support
maintenance).
a. If delivery valve is dirty, clean or replace it; if improperly installed, install correctly (para 4-3b).
b. If delivery valve is clean and properly installed, proceed to step 15.
Step 15. Remove cam, shoes, and rollers and inspect for wear (para 4-3b; notify general support maintenance).
a. If cam, shoes, or rollers are worn, replace (para 4-3b).
b. If cam, shoes, and rollers are okay, proceed to step 16.
Step 16. Remove plungers and inspect for burrs, corrosion or varnishes (para 4-3b; notify general support
maintenance).
a. If plungers are burred, corroded, or varnish accumulation is present, replace (para 4-3b).
b. If plungers are okay, proceed to step 17.
Step 17. Check rotor and hydraulic head assembly (in plunger area) for wear (para 4-3b; notify general support
maintenance).
a. If rotor and hydraulic head are worn in plunger area, replace (para 4-3b).
b. If rotor and hydraulic head are okay, proceed to step 18.
Step 18. Check drive shaft tang dimension (should be not less than 0.305 inch) (para 4-3b; notify general
support maintenance).
a. If drive shaft tang measures less than 0.305 inch, replace drive shaft (para 4-3b).
b. If drive shaft tang measures more than 0.305 inch, proceed to step 19.
3-17

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