Thread Tools Search this Thread
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

stewart is offline   Reply With Quote
Old 26 May 2009, 03:55   #2
spartacus's Avatar
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: 3,055
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.
spartacus is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 15:12.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.