Farymann Diesel 15D Series, Workshop Manual

Page: 58 / 76

III. ENGINE REPAIR
59
Figure 1 Figure 2
A gear pump (2) sucks the oil from the oil sump (1) and pumps it through the oilfilter
(3) to the main bearing (5) and to the conrod bearing.
Piston, piston pin, cylinder liner and rocker arms are splash lubricated. When oil
pressure rise above 4,5 bar (63 PSI) the oil pressure relief valve (4) opens and the oil
flows back into the oil sump partly.
All
Farymann
engines require heavy duty lubrication oils of at least CC, preferably CD
quality (API service classification).
For correct viscosity and oil change intervalls refer to operation manual. At least once
a year crankcase should be flushed to remove all dirt and abrasions that may be in the
crankcase.
Oil pressure testing
The oil pressure depends mostly on the bearing play (see section III.2). Before oil
presure make sure that oil level is topped up and correct viscosity is used.
Remove the oil channel plug screw (Figure 2) and connect gauge adaptor and oil
pressure gauge.
The oil pressure at idle speed should be at least 0.5 bar (7 PSI). At full load (2850 rpm
and 100°C/220°F oil temperature) it should be at least 1.8. bar (23 PSI).
If oil pressure is too low, check first if the oil has the correct viscosity (according to the
ambient temperature) and if the pressure relief valve is working before further
dismantling of the engine.