Overhauling The Sea-Water Pump - Volvo Penta MD6A Workshop Manual

Overhauling the sea-water pump

45. Remove the cover (6 bolts). Replace the impeller
with the help of two screwdrivers or similar tools.
IMPORTANT! Protect the edges on the pump
body. See Fig. below. Lever out the impeller with
the screwdrivers so far that the bolt becomes vi-
sible.
46. Unscrew the bolt and pull the impeller off the
shaft. If the sealing rings also have to be repla-
ced, the shaft can be pulled out entirely together
with the impeller, after which the bolt can be rele-
ased.
47. Remove the sealing rings 2 and the 0-ring 1
(earlier engines), and clean the pump body and
shaft. (IMPORTANT! The pump must be
removed from the engine.) Check to make sure
there is no burr on the shaft. NOTE! A new 0-ring
must not be fitted.
48. Fit new sealing rings. IMPORTANT! Turn the
sealing rings so that they are in their proper
position and make sure that they do not block
the drain hole in the pump body Grease the shaft
and carefully fit it into the body. Screw it through
the sealing rings but make sure the rings are not
damaged when doing so. Place the shaft so far
into the housing that the bolt hole is outside: Fit
the impeller and screw in the bolt. Then carefully
push in the impeller until it bottoms. Place a new
gasket on the cover and tighten up with the 6
bolts.
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