With the engine stopped vrescheyte fan by hand and make sure that it rotates uniformly and silently.
Replace coupling fan if she does not resist rotation or running noise.
A viscous clutch
Cross-section of viscous fan clutch
1 - clutch housing (secondary part) 2 - a leading disk (primary part) 3 - shaft flange 4 - consolidation 5 - the needle bearing 6 - cooling fins 7 - the oil scraper 8 - a spring
9 - thrust finger 10 - bimetallic plate 11 - a cover holder 12 - Spacer 13 - the incident hole 14 - the valve lever 15 - tank 16 - working chamber
PERFORMANCE ORDER
Warm up the engine to normal operating temperature and maintain his speed from 4000 to 4500 rev / min. Do not cover the radiator, otherwise the clutch is not to react to changes in temperature.
With the thermometer (temperature gauge), make sure that the heating of the engine to 90-95 ?� C the fan speed increases by about 1000 rev / min. When properly operated clutch it will be noticeable to the ear. Faulty clutch must be replaced.