STANDARD TROUBLESHOOTING PRACTICES

TM 9-2835-255-34

HOW TO USE TROUBLESHOOTING CONTINUED

STANDARD TROUBLESHOOTING PRACTICES:

The following steps need to be performed each time you are doing a troubleshooting procedure. These stan-

dard practices will improve the accuracy of fault isolation and help prevent damage to the engine or test

equipment.

Debris taken from engine oil system strainer screens and magnetic chip collectors must be inspected

carefully. Carbon debris can be mistaken for metal chips because the carbon is also slightly magnetic

allowing it to stick to magnetic chip collects. To identify carbon, simply crush the debris between the fin-

gers. If the debris crumbles, it is carbon. The presence of carbon in the oil system is normal and not cause

for rejecting a component.

Any time a connector is disconnected, it should be checked for cleanliness and broken, bent, or pushed

in pins. If you find missing or damaged pins, repair or replace connector or harness as required.

Ensure electrical connectors are fully mated. Hand tighten connectors whenever possible and only use

plastic jaw pliers as a last resort. There are three types of locking mechanisms for engine electrical con-

nectors. When connecting threaded connectors, if connector has alignment indicator mark, tighten con-

nector until washer alines with indicator mark. If there is no indicator mark, ensure that connector is fully

mated by turning connector until a metal-to-metal bottoming is felt. Wiggle harness slightly while turn-

ing connector to ensure that connector is fully mated. When connecting bayonet type connectors, turn

connector until an audible click is heard.

Always look for obvious damage to harnesses and all surrounding components while checking for loose

electrical connectors or making harness disconnects. Remember to connect all cables and harnesses

that were disconnected in order to get at the connector being checked. Replace all harnesses where

outer shield is damaged to the extent that inner conductors are visible.

Make sure all test connectors are covered with provided metal caps whenever testing is not being per-

formed.

3-3

Change 6