Table 5-2. Direct Support Troubleshooting-continued -706880683

TM 5-4210-233-14&P-1

Table 5-2. Direct Support Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ENGINE - Continued

LOW OIL PRESSURE - Continued

Step 2. Inspect oil pressure regulator valve for clogging or damage.

Remove and clean oil pressure regulator valve (see para 6-45).

Inspect valve, valve seat, and valve spring for damage (see para 6-45).

Replace damaged parts (see para 6-45).

Step 3. Inspect oil pressure relief valve for clogging or damage.

Remove and clean oil pressure relief valve (see para 6-45).

Inspect valve, valve seat, and valve spring for damage (see para 6-45).

Replace damaged parts (see para 6-45).

Step 4. Inspect oil pump for damaged parts.

Remove and clean oil pump (see para 6-46).

Inspect oil pump for worn, scored, or damaged parts (see para 6-46).

Replace worn or damaged parts (see para 6-46).

HIGH OIL CONSUMPTION

Step 1. Check if oil breather tube assemblies are clogged or damaged.

Remove and clean breather tube assembly (see para 4-140).

Step 2. Check for low air box pressure. Air box pressure, with zero exhaust back pressure, should

be 1.1 in. (27.9 mm) mercury at 1200 rpm, 3.8 in. (96.5 mm) mercury at 1800 rpm, and 5.0 in.

(127 mm) mercury at 2100 rpm.

If pressure is low, do Steps 3 and 4.

Step 3. Check if blower-to-block gasket is damaged (see para 5-21).

Replace damaged gasket (see para 5-21).

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