Makita Dolmar DCS460 Repair Manual page 25

11 CYLINDER / PISTON
NOTE: If there is a leak into the oil tank, it will
not be possible to fully identify the leak. If
pressure remains steady in the crankcase
after shutting off the oil line hole, for example
with a rubber stopper (see 05 OIL PUMP), it is
an indication that there is a defect in the
crankcase gasket to the oil tank.
1
Vacuum test
Since the radial gasket ring can also fail at
negative pressure, a vacuum must be
established in the crankcase to test the radial
ring.
Seal off the intake and exhaust sides as
described above.
Connect the over/underpressure pump to the
2 3
connection on the sealing plate 3.
Move the piston to top dead centre.
Set up a negative pressure of max. 0.3 bar
(4,35 psi).
If the pressure does not rise to more than 0.3
bar (4,35 psi) within 20 seconds, the radial
ring is OK. If the pressure continues to rise,
the radial ring will have to be replaced.
Remove the flywheel and if necessary the
generator.
Place the 13 mm radial ring puller
(944.500.871) over the shaft and turn it firmly
into the radial ring. When screwing in the
spindle it is supported against the shaft and
pulls the radial ring out.
Note: The radial ring of the combination
bearing is available as a single part
(962.900.065)
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