Repairing water pump
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Installation note for mechanical seal:
Install mechanical seal while ”wet”, i.e. to install it, coat holding sleeve (1) and water pump shaft (2) with a
mixture of either 50 % water and 50 % cleaning spirit or 35 % to 50 % antifreeze agent as per MAN 324
and water.
Other lubricants must not be used.
Since the seal on collar (4) is coated with sealing paint, no sealing agent must be applied if the location
bore in the water pump housing is in faultless condition. If the bore shows even the slightest scores or other
minor damage, Dirko-Transparent, part no. 04.10394.9229 is to be applied to the collar.
Place seal with synthetic transport cap on shaft (2) and use installation tool to press it in until the tool con-
tacts the housing. Remove synthetic cap.
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Note: Examinations have shown that most cases of damage to the water pump can be attributed to unsuit-
able coolants. Only the antcorrosion and antifreeze agents expressly approved by MAN Nutzfahrzeuge AG
as per MAN norm 324 (see brochure ”Fuels, Lubricants, Coolants for Industrial and Marine Diesel Engi-
nes”) guarantee faultless operation.
In the event of repairs exchange water pump only if it has been found to be leaky.
For design-related reasons small quantities of coolant may permeate through the mechanical seal on the
water pump. This permeating coolant leaves a trace below the drain bore on the water pump. The water
pump need not be exchanged because of this trace of permeating coolant.
For this reason before exchanging or repairing a water pump ascertain
D whether the coolant circuit shows visible and recurrent loss of water; if so
D whether the loss of water is caused by coolant emerging from the expansion tank (e.g. overfilled) or by
other leaks on hoses, etc.
Water pumps must be exchanged only if water drips visibly while the engine is in operation or after the en-
gine has been switched off.
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