PLATE 3580749 - Caterpillar

To Adjust the Driving Belt
M2Fan and dynamo or alternator belt tension should be adjusted so that it is possible to depress the belt, approximately 3/8 in (10 mm). This should be checked between crankshaft and water pump pulleys (high position water pump) or between crankshaft and dynamo or alternator pulleys (low position water pump) see Fig. M.2.Correct tension of the fan and dynamo or alternator belt should be maintained by periodical checking and adjustment as given in Section C.Belt adjustment is obtained by altering the position of the dynamo or alternator with an adjustable link. When a new belt is fitted it is advisable to recheck the adjustment after a short running period. For those engines which have twin fan belts fitted, they should not be renewed individually but in pairs.To Remove and Refit Water Pump-High Position Type
1. Remove fan belt.2. Remove fan.3. Disconnect connections to water pump.4. Remove pump.5. Refit pump in reverse sequence. Reset fan belt tension.To Remove and Refit Water Pump-Low Position Type
1. Remove fan belt.2. Remove fan.3. Disconnect connections to water pump.4. Remove dynamo or alternator and bracket.
M35. Unscrew and remove nut and washer from stud at top of water pump. Unscrew four setscrews securing pump to cylinder block. Withdraw pump from engine (Fig. M.3).
M46. To remove pump rear body from cylinder block, take out remaining setscrew, which passes through rear body only. Withdraw body from its location (Fig. M.4).7. Refit pump rear body and water pump in reverse sequence.8. Tension fan belt. With later pumps which are secured directly to the cylinder block, the lower fixing setscrew and corresponding drilled boss on the water pump body has been deleted and the joint and cylinder block modified accordingly. The later type water pump is interchangeable with its predecessor providing the later joint is used and the lower setscrew discarded.To Dismantle the Water Pump-Both Types
M51. Remove the nut and spring washer (earlier engines may have self locking nut and plain washer) securing the water pump pulley and withdraw the pulley from the shaft (Fig. M.5), also the driving key.2. Press water pump shaft, complete with impeller, out of the body from the front.3. Press impeller from the shaft.4. Remove water seal from the shaft.5. Remove bearing retaining circlip from front of body.6. Press out the two bearings and distance piece.7. Remove front grease seal, seal retainer and flange. With some water pumps, the seal, retainer and flange has been deleted and the length of the distance piece increased accordingly.Inspection
1. Examine body for cracks, damage or corrosion.2. Examine drive shaft for wear ensuring inner diameter of the bearings are a perfect fit on the shaft. The shaft should be renewed if the inner races rotate on it.3. Remove rust and scale from impeller and inspect for cracks or damage. Examine impeller hub sealing face for excessive wear or scoring.4. Examine water seal for damage.5. Inspect bearings for pitting, corrosion or wear.To Re-Assemble the Water Pump-Both Types
1. Press rear bearing onto the shaft, fit distance piece and