Page 160 - 05. Subyek Teknik Mesin - Automobile Mechanical and Electrical Systems Automotive Technology Vehicle Maintenance and Repair (Vehicle Maintenance Repr Nv2) by Tom Denton

2
144 Automobile mechanical and electrical systems

Figure 2.125 Oil fi lters

Figure 2.126 Oil circuits: 1, full fl ow (bottom left bypass fl ow); 2, sump; 3, pump; 4, fi lter;
5, main gallery; 6, main bearings; 7, big ends; 8, camshaft

extra fi lter is also used that stops very fi ne particles. The most common type has
a folded, resin-impregnated paper element. Pumping oil through it removes all
but smallest solids from the oil.
Most engines use a full-fl ow system to fi lter all of the oil after it leaves the
pump ( Fig. 2.126 ). The most popular method is to pump the oil into a canister
containing a cylindrical fi lter. From the inner walls of the canister, the oil fl ows
Key fact through the fi lter and out from the centre to the main oil gallery. Full-fl ow fi ltration
Most engines use a full-fl ow system works well provided the fi lter is renewed at regular intervals. If it is left in service
to fi lter all of the oil after it leaves the too long it may become blocked. When this happens the build-up of pressure
pump. inside the fi lter forces open a spring-loaded relief valve in the housing and the
oil bypasses the fi lter. This valve prevents engine failure, but the engine will be
lubricated with dirty oil until the fi lter is renewed. This is better than no oil!