Checking Compression - Man D 2866 LE 401 Repair Manual

Fig. 1
D Check valve clearance and adjust, if necessary,
see page 84
D Let engine warm up
D Remove all fuel injectors, see page 30
D For compression guideline values, see publica-
tion "Engineering S Data S Setting values"
Start with 1st cylinder (water pump end). Insert
new seal, screw on test connection of compression
recorder with union nut and tighten with pin
spanner.
Fig. 2
Insert test sheet into compression recorder. Screw
compression recorder for diesel engines on to test
connection.
Turn engine over with starter until needle deflection
of compression recorder stops, at the same time
holding adjusting lever of injection pump in stop
position.
Connect up compression recorder with test con-
nection to the next cylinder, and check all cylinders
as described above.
Fig. 3
Depending on the compression recorder design,
the engine can also be started directly by the com-
pression recorder. For this purpose the electrical
connections on the starter electromagnetic switch
(terminals 50 and 30) are to be accordingly
connected up.
Fig. 4
Compare the values measured and remove com-
pression recorder and test connection. Apply
"Never Seeze" to contact faces on fuel injectors.
Screw in fuel injectors with nozzle and new seal.
Screw on union nut and tighten to specified torque
(see "Engineering S Data S Setting values").
Connect up injection lines and leakage fuel return
lines.

Checking compression

1
3378
2
3381
3
3382
4
3383
97