TM 5-3895-360-13 4-9.   TROUBLESHOOTING   SYMPTOM   INDEX. Problem Page Number Problem  Title Number ENGINE 1. Engine Will Not Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13 2. Engine Starts But Will Not Continue To Run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13 3. Engine Lacks Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12 4. Engine Stalls Under Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13 5. Engine is Noisy or Knocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12 6. Engine Has Poor Acceleration.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13 DRIVE MECHANISM 7. No Tamping Operation While Engine is Running . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13 Table 4-3. Direct Support Troubleshooting. PROBLEM PROBABLE CAUSE TEST   PROCEDURE/REMEDY ENGINE 1. Engine will not start. a. Engine compression is low. a. Check engine compression (see paragraph 6-5). Replace piston rings if compression is low (see paragraph 6-3). b.  Dirt  present  in  carburetor. b. Disassemble and clean carbure- tor (see paragraph 7-8). 2. Engine starts but will not con- Fuel pump is faulty or carburetor is Remove and disassemble carbure- tinue to run. dirty. tor and inspect (see paragraph 7-8). Replace fuel pump as necessary (see paragraph 7-8). 3.  Engine  lacks  power. a. Engine compression is low. a. Check engine compression (see paragraph 6-5). Replace piston rings if compression is Iow (see paragraph 6-3). b. Piston or cyiinder wall is scored. b. Check engine compression (see paragraph 6-5). Replace piston rings or cylinder if compression is low (see paragraph 6-3). 4-12