Water Pump; Bolt Screwing - Mitsubishi 4DQ50 Service Manual

11 WATER PUMP
If any play developed on water pump shaft or water leaking, disassemble pump in the
following procedure and service as required.
First, remove fan coupling flange with puller and take off snap ring. Then open rear
cover and take out inner components. Impeller can be pulled cut with puller.
Check unit seals and if badly worn or affected in floating seat surface or carbon worn
off, renew them.
Of new bearings, grease may come out a little, but this means nothing particularly
wrong.
12 BOLT SCREWING
1)
For screwing of main bolts, the necessary instructions were already given in
Sect. 7, "Re-screwing of Main Bolts", Chap. 3. The other bolts should be screwed
with reference to the following table.
Nominal Thread
mm
6
8 10 10 12
Pitch
mm
1
1.25 1.25 1.5 1.25
Plated
Kgm 0.9 2.1 4.3 4.0 7.4
(ft-Ib) (6.5) (15) (31) (29)
(54)
Clamping
kgm 0.7 1.4 3.0 2.8
5.2
Not plated
(ft-Ib) (5.0) (10)
(22)
(20) (38)
2) Prior to screwing the following bolts, coat their threads with oil-proof liquid
packing ("atmosit'1 for prevention of leakage.
4 lower clamp bolts on crank shaft rear end oil seal
3 lower clamp bolts on timing gear case
2 clamp bolts on flange plate to couple injection pump
2 fixing bolts on breather
3) Packil195 (gaskets) and liquid packings to be used are listed below.
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