TM-9-2320-272-24-3

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 3 OF 4

JUNE 1998

TM-9-2320-272-24-3 - Page 118 of 799

TM 9-2320-272-24-3

4-63. WATER PUMP (M939/A1) MAINTENANCE (Contd)

NOTE

l

This table provides the minimum, maximum, and worn

serviceability standards for the water pump assembly. The wear

limits indicate the point to which a part or parts may be worn

before replacement is required.

l

An asterisk (*) in the wear limits column indicates the part or

parts must be replaced or repaired when worn beyond the

dimensions specified in the “size and fit of new parts” column.

Table 4-8. Repair and Replacement Standards for Water Pump.

REF.

SIZE AND FIT

WEAR

NO.

POINT OF MEASUREMENT

OF NEW PARTS

LIMITS

WATER PUMP BODY

1

Housing bearing bore

2.4408-2.4414 in.

2.4494 in.

(61.996-62.012 mm)

(62.215 mm)

2

Housing bore (impeller end)

1.5000-1.5200 in.

*

water pump body (I.D.)

(38.100-38.608 mm)

Minimum press fit between shaft and

0.001 in.

impeller

(0.03 mm)

3

Drive pulley bore inside diameter (I.D.)

0.663-0.6673 in.

*

(16.84-16.949 mm)

Minimum press fit between shaft and pulley

0.001 in.

(0.03 mm)

SHAFT

4

Shaft diameter (O.D.)

0.6262-0.6267 in.

*

Impeller end

(15.905-15.918 mm)

5

Shaft diameter (O.D.)

0.6262-0.6267 in.

*

Seal seat location

(15.905-15.918 mm)

6

Shaft diameter (O.D.)

0.9843-0.9847 in.

*

Inner bearing

(25.001-25.011 mm)

7

Shaft diameter (O.D.)

0.9843-0.9847 in.

*

Outer bearing

(25.001-25.011 mm)

8

Shaft diameter (O.D.)

0.6693-0.6696 in.

*

Pulley end

(17.002-17.007 mm)

IMPELLER

9

Impeller bore inside diameter (I.D.)

0.624-0.625 in.

*

(15.85-15.88 mm)

10

Impeller vane to pump body clearance

0.020-0.040 in.

*

(cast iron)

(0.51-1.02 mm)

4-382