Fayat Group Bomag MPH 122-2, Operating & Maintenance Instructions, Page: 157 / 198

Every 1000 operating hours
BOMAG 157 MPH 122-2
6.47 Checking the crankcase
pressure
!
Caution
Excessive pressure in the crankcase can
cause lubrication oil leaks on all seals.
This may be caused by a not correctly func-
tioning crankcase ventilation.
Moreover, too high crankcase pressure can
also cause damage to the exhaust turbocharg-
er and the complete engine.
l
Pull out the oil dipstick .
Fig. 318
l
Connect the U-pipe pressure gauge (1) (Fig.
317) to the oil dipstick opening using hose and
hose clamps.
l
Make sure that the connection is tightly
sealed!
l
Fill half of the U-pipe pressure gauge with wa-
ter.
l
Fasten the U-pipe pressure gauge at a quiet
location (e.g. on the wall).
l
Run the engine up to operating temperature.
l
Run the engine at high idle or under full load.
l
Read the pressure on the fine measurement or
U-pipe pressure gauge.
!
Caution
If the pressure exceeds the permissible crank-
case pressure you should perform trouble-
shooting and rectify the fault.
Nominal value
high idle speed: max. 20 mm water col-
umn
full load: max. 50 mm water col-
umn