Water Pump - Check, Removal, And Installation - Yamaha TDM850 User Manual

UNREGISTERED VERSION OF PICTURE-DESK 1
7.4a Radiator mounting bolts (arrowed) -
1991 to 1995 TDM models
the radiator away from the machine, noting
how it fits (see illustrations).
5 On TDM models, if required, unscrew the
bolts securing the radiator stay to the frame
and remove the stay.
6 If necessary, remove the cooling fan (see
Section 4) from the radiator.
7 If required, remove the stone guard from
the radiator. Check the stone guard and the
radiator for signs of damage and clear any dirt
or debris that might obstruct air flow and
inhibit cooling. If the radiator fins are badly
damaged or broken the radiator must be
renewed. Also check the rubber mounting
grommets, and renew them if necessary.
Installation
8 Installation is the reverse of removal, noting
the following.
a) Make sure the various collars and
grommets are correctly installed with the
mounting bolts.
b) Make sure that the fan wiring is correctly
connected.
c) Ensure the coolant hoses are in good
condition (see Chapter 1), and are
securely retained by their clamps, using
new ones if necessary.
d) On completion refill the cooling system as
described in Chapter 1.
8.5 Slacken the clamp (arrowed) and
detach the hose
ONREGISTERED VERSION OF PICTURE-DESK 1
7.4b Radiator mounting bolts (arrowed) -
1996-on TDM models and all TRX models
(TRX shown)
8 Water pump - check,
removal, and installation
Check
1 The water pump is located on the right-
hand side of the engine. Visually check the
area around the pump for signs of leakage.
2 To prevent leakage of water from the
cooling system into the lubrication system
and vice versa, two seals are fitted on the
pump shaft. On the underside of the pump
body there is a drainage hole (see illustration
8.12a). If either seal fails, this hole should
allow the coolant or oil to escape and prevent
the oil and coolant mixing.
3 If there is any leakage from the drainage
hole, remove the pump and renew it -
individual components (except O-rings and
bolts) are not available.
Removal
4 Drain the coolant (see Chapter 1). Place a
suitable container below the water pump to
catch any residue as the water pump is
removed. On XTZ models, remove the
exhaust system (see Chapter 4). Also unscrew
the bolts securing the right-hand frame
downtube section and remove it.
5 Slacken the clamp securing the coolant
hose to the pump cover and detach the hose
(see illustration).
8.6 Water pump mounting bolts (A), cover
bolts (A) and (B)
Cooling system 3*7
7.4c Radiator mounting bolts (arrowed) -
XTZ models. Note how the rubber damper
locates in the bracket (A)
6 Unscrew the bolts securing the pump to the
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crankcase (see illustration). Carefully draw
the pump from the crankcase, noting how it
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fits. It may be necessary to lever it out to
overcome the O-rings on the pump body and
on the joint pipe between the top of the pump
housing and the union on the cylinder block.
Caution: A shim is fitted on the pump shaft
between the circlip and the drive gear. The
shim will probably stick to the gear,
however great care must be taken as it is
possible for the shim to slip down into the
engine as the shaft is withdrawn from the
gear.
Remove the O-ring from the rear of the pump
body and from the joint pipe and discard them
as new ones must be used. Note the position
of each bolt as their lengths differ.
7 Unscrew the remaining bolts securing the
pump cover and remove the cover (see
illustration 8.6). Discard the cover O-ring as a
new one must be used.
8 Wiggle the water pump impeller back-and-
forth and in-and-out. If there is excessive
movement the pump must be renewed.
Rotate the impeller and check that it turns
smoothly and freely. Also check for corrosion
or a build-up of scale in the pump body and
clean or renew the pump as necessary.
9 To remove the pump drive gear, first
remove the front balancer shaft (see Chapter
2). Slide the gear out of its bore in the
crankcase and lift it out, noting how it fits (see
illustration).
8.9 Water pump drive gear (arrowed)
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