ANNUAL MAINTENANCE
19-3
MasterCraft recommends that your an-
nual–or 100 hour–maintenance require-
ments be performed by your MasterCraft
dealer. The staff there has the proper
equipment and technical training to best
meet your service needs.
Replace the raw water pump impeller
Change the raw water pump impeller annually. This
is extremely important! Through normal wear and tear,
the impeller usually lasts no more than one season
even under ideal conditions. If it does not function prop-
erly–and it will not when worn–it can cause serious
engine overheating and potentially void your warranty!
MasterCraft recommends that this procedure be performed by a MasterCraft service technician. If, however,
you wish to complete this function yourself, detailed instructions are included under Before Each Use, Check the
Impeller section of this manual, where documentation was provided to assist boat owners who experience over-
heating problems or who boat in “dirty” water.
Have an engine tune-up performed
A complete engine tune-up, including replacement
of the PVC valve, spark plugs, distributor cap, rotor
and ignition wires (if needed) should be performed
annually. Also, some engines require adjustments for
spark, dwell and idle. All of these functions require
special knowledge, tools and test equipment.
For this reason, MasterCraft strongly recommends
having the engine tune-up performed by your dealer.
Change transmission fluid
In order to thoroughly drain all the old transmission fluid, you will need to run the boat engine for a period of at least five
minutes. Do not run your engine without it being in water, unless you have the appropriate, professional hook-up available to
protect the engine and drive-train components. If this is not available to you and if you do not wish to run your boat in the
water and then remove it for this procedure, have your MasterCraft service technician perform this function because he has
the proper equipment to protect your engine while it runs out-of-water.
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