TM 5-3805-280-24-2
Engine System Operation and Tests
105
2. Install JT016791 Adapter with O-ring (or D14550BA2
22
Adapter) in injection nozzle bore. Use JT02017 Holding
Clamp2 to hold JT01679 Adapter in position. Install
hold-down screw in clamp and tighten screw to 37 Nm
(27 lb-ft). Attach JT016822 Test Gauge (or D14547BA2)
to adapter.
NOTE: If using FKM10021 Compression Test Set, install
19.58--90.578 Adapter (A) in injection nozzle
bore with R73788 nozzle spacer (B) and two
R92352 nozzle seals (C). Use holding plate (D) to
secure. Then attach FKM10022 test gauge (E) to
adapter.
3. Push throttle lever to "STOP" position. Turn crankshaft
for 10--15 seconds with starting motor (minimum
cranking speed --150 rpm cold/200 rpm hot).
4. Compare readings from all cylinders. Compression
pressure must be within specification.
Engine Compression Pressure Test--Specification
Engine Compression Pressure:..................... 2400 kPa (24 bar) (350 psi)
Minimum
Maximum Difference Between ......................... 350 kPa (3.5 bar) (50 psi)
Cylinders
NOTE: Pressure given was taken at 183 m (600 ft) above
sea level. A 3.6 percent reduction in gauge
pressure will result for each additional 300 m
(1000 ft) rise in altitude.
All cylinders within an engine should have
approximately the same pressure. There should
be less than 340 kPa (3.4 bar) (50 psi) difference
between cylinders.
5. If pressure is much lower than shown, remove gauge
and apply oil to ring area of piston through injection
A--19.58--90.578 Adapter
nozzle bore. Do not use too much oil. Do not get oil on
B--R73788 Nozzle Spacer
the valves.
C--R92352 Nozzle Seal
D--Holding Plate
E--FKM10022 Test Gauge
1
Part of JT01674 Compression Test Set
2
Part of D14546BA Compression Test Set
Continued on next page
RG,105,JW7652
1921NOV972/3
13-499
