1GM10 Overheating -- where's the thermostat

[robjarman]

The water pump is actually quite easy to remove. Much easier to work on for impellor etc. Just be careful the first time you hit the original bolts. There is no gasket involved, just a large rubber o ring which is re-used. Just the timing case behind - no big deal.
I always do the impelllor with the pump off. Changed the bolts to stainless - so I know the heads are good. The one behind the crankpully is awkward - but its only a 5 min job.

Stubborn hoses release easily if wrapped with kitchen roll or similar - and pour on boiling water. Leave a minute to or so and they slip off.

the manual for free is here -
http://www.motoren.ath.cx/menus/yanmar.php

Hi - can I ask - when you replace the water pump as a complete unit, how do you align its driven shaft with the drive slot in the engine?

also, that link for the manual does not work - do you have an alternative link?

cheers
Rob
Forest of Dean

 

[andsarkit]

You can rotate the engine with the starting handle until the slots line up.
There is a slightly different manual here: http://www.jeanneau-owners.com/Manuals/3GM Engine Service Manual.pdf
If you need a new pump it is half the price in USA but you will need a friend to send it as Yanmar don't allow them to ship outside their areas. That enables them to fix the prices in UK - one reason why I would not buy another Yanmar although it is a good basic engine.

 

[VicS]

Hi - can I ask - when you replace the water pump as a complete unit, how do you align its driven shaft with the drive slot in the engine?

also, that link for the manual does not work - do you have an alternative link?

cheers
Rob
Forest of Dean

The Motoren engine manuals site seems to have died/ been closed

Yanmar owners manuals and service manuals can be found on Barrus's website https://www.barrus.co.uk/divisions/marine/diesel/yanmar-marine/manual-downloads/