Section IV. UNIT TROUBLESHOOTING PROCEDURE

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Table 4-1. Unit Preventive Maintenance Checks and Services Semiannual Schedule-cont.

TM-5-2010-205-14 Propelling Unit Outboard NSN 2010-01-251-2227 Manual

ENGINE

TM 5-2010-205-14

Section IV. UNIT TROUBLESHOOTING PROCEDURE

4-9. GENERAL.

a. The table in this section lists the common malfunctions which you may find during operation or maintenance of

the propelling unit or its components. You should perform the test or inspection and corrective maintenance in the order

listed.

b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a

malfunction is not listed or it is not corrected by the listed correct actions, notify your supervisor.

Malfunction

Test or Inspection

Corrective Action

ENGINE

1. Engine Exhaust is Black or Grey.

Check for improperly timed or positioned injectors.

Check air cleaner for restrictions.

2. Engine Exhaust is Blue.

STEP 1. Remove air box covers one at a time with engine running at idle speed. Look for too much lubrication oil.

If oil is excessive, notify Direct Support Maintenance.

STEP 2. Perform a cylinder compression check on all cylinders. If compression is low in any or all cylinders, notify

Direct Support Maintenance. If compression is normal, proceed to Step 3.

STEP 3. Check for worn or defective valve guides or seals. If valve guides or seals are worn or defective, notify

Direct Support Maintenance. If valve guides or seals are not worn or defective, proceed to Step 4.

STEP 4. Remove air inlet housing and with engine running at 1/2 throttle and at idle, use a flashlight and inspect for

oil leaking past blower seals. If oil is leaking past seals, replace blower.

3. Engine Exhaust is White.

Check for misfiring cylinders.

If cylinder is misfiring, notify Direct Support Maintenance.

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