Checks And Adjustments; Compression Test - Volvo Penta TD520GE Workshop Manual

Checks and adjustments

30
Checks and adjustments

Compression test

(21002)
Special tools:
Adapter for compression testing .................. 999 8694
Compression gauge .................................... 998 8539
The injectors have been removed, the
valve clearance has been checked.
1. Fit adapter 999 8694.
2. Use the existing injector yoke.
Tighten the screw to ........................... 19 ±2 Nm
(14 ±1.5 lbf ft).
3. Connect the compression tester, 998 8539.
Turn the engine over with the starter motor. Com-
pression: 3-3.8 MPa (435-551 psi).
NOTE! Make sure that the fuel control rod is in the no
fuel position (stop position).
The measured compression depends on the engine
speed during the measuring process and the ambient
air pressure.
It is difficult to give an exact limit value due to the
ambient air pressure. We recommend that the com-
pression test is to compare the cylinders of the en-
gine. If the pressure difference is greater than 15%
the cylinder in question should be dismantled
to determine the cause.
NOTE! Refit the injector with a new copper gasket and
tighten to 19 ±2 Nm (14
Fit the new fuel delivery pipe and tighten in two stages
5 Nm and 25 +3.5 Nm (19
0
IMPORTANT! All delivery pipes must be
tightened with the same tightening torque.
Tighten the rocker cover to 11 ±1 Nm (6.6 ±0.7 lbf
ft).
NOTE! The fuel leakage lines must always be re-
placed if removed.
Group 20
±1.5 lbf ft).
+2.5 lbf ft).
0