Repairing engine water pump
D 2866 LUE 602
47
Replacing coolant pump during repair work only in event of identified leakage
The design of the coolant pump mechanical cassette seal permits small amounts of coolant to pass
through it.
This coolant passing through results in a trace of drained coolant below the drain bore.
This trace of drained coolant does not mean that the coolant pump has to be replaced.
For this reason bevore exchanging or repairing a water pump ascertain,
D whether the cooling circuit shows visible and recurring signs of coolant loss; if yes
D whether the coolant loss is caused by spillage from the expansion tank (e.g. too full) or by other leaka-
ges from hoses, radiator etc.
Coolant pumps may only then be replaced if dripping water can clearly be seen while the engine is running
or after it has been turned off.
Installation note for mechanical seal:
Fit the mechanical seal “wet”, i.e. when fitting, coat holding sleeve à and coolant pump shaft À with a mix-
ture of 50% water and 50% cleaning spirit or 40% to 50% antifreeze as per MAN 324 and water.
Other antiseize agents must not be used.
Because the seal on collar Á is coated with sealing paint, no sealing paint needs to be applied if the loca-
ting bore in the coolant pump housing is in perfect condition.
If the bore shows even the slightest scoring or other minor damage, a sealing bead of Dirko-Transparent,
must be applied to collar Á.
Fit the seal with a plastic transportation cap onto shaft Á and use installation tool to press it in until the tool
contacts the housing. Remove the plastic cap.
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Note:
Tests have shown that most cases of damage to the coolant pump can be attributed to the use of
unsuitable coolants.
Only the anticorrosion and antifreeze agents expressly approved by MAN Nutzfahrzeuge AG as
per MAN norm 324 (see brochure “Fuels, Lubricants, Coolants for and MAN Diesel Engines”) gua-
rantee faultless operation.
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