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Old 24 May 2009, 13:42   #1
Country: UK - Scotland
Town: millport isle of cum
Boat name: megank
Make: selva
Length: 4m +
Engine: selva 35hp
Join Date: Oct 2008
Posts: 3
mariner impellor

hi guys just bought a mariner 30 hp modelma 30 al which is a2004 engine it has not been used for over a year starts ok but not pumping water could anybody give me advice on changing impellor ie where it is bit of a greenhorn with outboards

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Old 26 May 2009, 03:55   #2
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Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,392
1/ Make sure the engine is in neutral.

2/ Undo gear selector shift linkage.

3/ Now remove the bolts holding the gearbox to the mid-section. Normally there is a hidden bolt under the zinc sacrificial anode.

4/ Gearbox should now drop down. It may need a little gentle persuasion (use a rubber mallet) and knock gently around the anti-cavitation plate to free it.

5/ The waterpump normally has a plastic cover held in place with 4 bolts. Remove the bolts and the cover.

6/ Now pull the old impeller off the drive-shaft. Note: there will be a crescent shaped metal dowel pin that locates in the impeller to stop it rotating on the driveshaft.

7/ Inspect the condition of the metal faceplate. If it's corroded or pitted - then replace. Check water-passages under the faceplate and clean if neccesary.

8/ Clean driveshaft. Lightly grease the impeller (Castrol marine grease) and slide it down the driveshaft - and engage it with the metal dowel pin.

9/ Lightly grease waterpump housing. You may require a new gasket - if it's torn. Lightly grease this too.

10/ Important: Rotate the driveshaft clockwise so that the blades of the impeller fit in the waterpump housing while pressing it into final position.

11/ Bolt waterpump down, reconnect gear shift linkage and lower gearbox to mid-section.

12/ Check the gears select properly in forward and reverse.

13/ Check thermostat housing and clean thermostat and housing (sometimes the thermostat can seize and housing gets build up of salt) - if used in salt water environment.

14/ Use strimmer wire and clean the tell-tale hole.

15/ Test engine with muffs.
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