154.138.251.335 (DE18-05928-002) | C.W. PUMP ASSY. (HT C.W. PUMP)

BRAND:

CYM was established in 1956 and is a wholly-owned subsidiary of CSSC. Specializing in the design and production of marine diesel engine bearings and bushings, intake and exhaust valves and valve seats, water and oil pumps, and camshafts. She is MAN China OEM and Daihatsu China OEM, and her products are sold in Germany and other European and American markets and Japanese markets.

DESCRIPTION:

The cooling water pumps are a spiral type. The pumps are installed at the front of the engine, and are driven by the auxiliary machine driving gear at the front end of the crankshaft.

FEATURE:

The item is strictly produced in accordance with Daihatsu Japan original technical standard and drawings. The performance of it is the same as Daihatsu Japan genuine part, and also, it is able to be exchanged with Daihatsu Japan genuine part.

PRECAUTIONS:

1.1.   The screw of the impeller mounting nut for normal rotation engine is threaded as "lefthanded" screw. Therefore, be careful of the direction when loosening or tightening the nut and screw.

1.2.   In case that the clearance is over the replacement limit, replace the parts, of which wearing degree is larger. Excessive wear may degrade the pump efficiency.

1.3.   Replace the bearing at the time of the periodical inspection of every 8,000 to 12,000 hrs. (every 2 to 3 years) with a new one, even when there is no particular abnormality on it.

1.4.   To tighten the impeller nut (b) and the pump gear nut (h), apply the lubrication oil to the nuts, and then tighten the nuts with the specified torque.

1.5.   When tightening the pump gear nut (h), fix the gear and then tighten the nut so that the load (reaction) cannot be applied to the impeller.

1.6.   Cautions when assembling pump gear and the pump, must be requested to use the special tightening nut tool.

1.7.   Cautions when assembling the cooling water pump:

         1) Be minded to perform the assembling in such a manner that the lubricating oil inlet of the bearing case faces straight upward (the notched mark "O" facing straight upward), when the pump is mounted on the engine.

         2) Replace the oil seal, mechanical seal, packing, folded washer, O-ring, etc. with new ones.

         3) Be careful not to assemble the oil seal in the wrong direction.

         4) Mark the direction of the washer claw on the impeller (refer to Fig. 1).

         5) Tighten the impeller nut with the specified torque using a torque wrench. When tightening the impeller nut, check that the folded washer does not turn together with the nut.

         6) Before fitting the pump body, turn the impeller with your hand, and check that the impeller can rotate smoothly and there is a play (0.1 to 0.7 mm) in the axial direction. Also check that deflection is 0.05 mm or less on the outer surface of the impeller (refer to Fig. 2).

1.8.   Caution in handling mechanical seal:

         1) Do not use any greases.

         2) Do not apply any oils to the sliding surface. If oil or foreign material is on the sliding surface, wipe it off the sliding surface using clean cloth moistened with alcohol or acetone.

         3) Apply a thin coat of turbine oil #32, or equivalent oil, to the inner surface of the mechanical seal and the shaft, and then fit the mechanical seal.

         4) Leave the mechanical seal as it is for 30 minutes or more.

1.9.   If the flange surfaces cannot be fitted tightly due to the distortion of piping, correct the distortion of the piping before connecting. If the distorted piping is forcibly connected, the pump bearing may be damaged.