Volvo Penta D2-55 Workshop Manual

22
Design and function
Reduction valve
The lubricating oil pressure is limited by a reduction
valve. The valve is located in the lubricating system
just before the oil filter. The valve opens with high
pressure and allows the oil to flow back into the sump.
Crankcase breather
To prevent over-pressure and to separate fuel vapor,
water vapor and other gaseous combustion products,
the engine is fitted with closed crankcase ventilation.
Oil filter
The filter is a full flow filter, which means that all the
oil is filtered before it is forced out into the lubrication
system.
The filter element consists of folded filter paper.
There is a bypass valve (A) at the base of the filter,
which opens and allows oil to flow past the filter if the
filter insert should become blocked.
A
D2-55A/B/C
D2-75A

Volvo Penta D2-55 Specifications

General

Engine Type	Diesel
Number of Cylinders	4
Power Output	55 hp
Aspiration	Naturally aspirated
Alternator	115 A
Fuel System	Direct injection
Bore x Stroke	84 mm x 100 mm
Cooling System	Freshwater cooling with heat exchanger
Width	523 mm
Displacement	2.2 l (134 cu in)