Cooling System Water Pump The water pump is provided with a sealed bearing. Adjusting or greasing will not be necessary. Hose Connections Check periodically to ensure all the connections are in good order and the clips are tight. A leaking connection results in loss of coolant and thus engine efficiency. When using antifreeze in the cooling system, it is absolutely essential to have efficient connection so check these and should there be any doubt as to their serviceability, renew. Fan & Fan Belts A 6 Blade plastic fan is mounted on water pump and is driven vide fan belt by the main drive crank pulley. While the engine is in operation, the fan draws air through the radiator core. Slippage of belt on pulley can cause over heating. The Fan belts shall always be dry and free from oil or Grease. Incorrect belt tension results in its rapid wear. Crank pulley is assembled on crank shaft. Belt Adjustment To adjust belt tension, loosen the alternator on the adjustable bracket and lock the bolt in the location that gives correct belt tension (270-310 N) such that the belt can be depressed without much effort by the thumb, 0.25 to 0.4 inch.
A
Belt Removal 1. Loosen the Bolt (C). 2. Push the alternator down. 3. Ease the fan belt off the alternator pulley. 4. Ease the fan belt off the main drive pulley. 5. Slide out the belt from water pump pulley over the fan blades.
B C
D
Belt Replacement Reverse the procedure of fan belt removal stated above. Adjust the fan belt tension as previously detailed. Draining the System Two drain plugs must be opened. One is on LH side of crankcase and one on radiator bottom tank. To speed up draining, remove the radiator cap. Ensure that the drains are not clogged. Close the taps after draining is complete.
A. B. C. D.
Alternator Mounting Alternator Adjusting Bolt Adjusting Bracket
Cleaning out Dirt and Sludge Drain cooling system as directed above. Fill the cooling system with a solution of 1.0 Kg. of ordinary baking soda to 7.0 litres (1.84 US Gallons) of water. Do not replace the radiator cap. Operate the engine until the coolant is hot. Drain, flush with clean water and refill with a rust inhibitor or anti-freeze solution.
70
3600 Series PST, TIER-4 Models - 3640 & 3650
