Am I Missing Something ?

[TOM]

I'm trying to remove the water pump off my 4JH4TE Yanmar 75hp {its leaking at the seal end} .I'm at a loss as the bottom left and right hand screws can not come off as there is not enough clearence between it and the engine mount. It appears that the water pump was put on then the engine mount . I have attached a pic i loosened the screw so you can see how it butts up against the engine mount,it is the same on the other side!! The green stuff is where the pump as been leaking . I know there are a few forum members with the same motor or anyone else who has exsperienced the same problem.

www.byamee.com

[Hydra]

TOM, I have no experience with Yanmar engines. However, I have had a leak on the seawater pump on my Nanni engine. The leak was between the shaft coming from the engine and the gasket around it.

There was no need to remove the whole pump: the gasket was held by a circular spring (known as a "Circlip" here), accessible from the inside of the pump. I just had to buy the special pliers to remove the spring.

Alain

[TOM]

Originally Posted by Hydra

TOM, I have no experience with Yanmar engines. However, I have had a leak on the seawater pump on my Nanni engine. The leak was between the shaft coming from the engine and the gasket around it.

There was no need to remove the whole pump: the gasket was held by a circular spring (known as a "Circlip" here), accessible from the inside of the pump. I just had to buy the special pliers to remove the spring.

Alain

Thanks Hydea,

Mine is not a pulley driven pump and requires the pump to be pulled off before the seals can be replaced. I have since managed to do this but not without proping up the back of the motor and removing the engine mount first ....The guys who design these motors have scant regard for repair or servicing!

www.byamee.com

[delmarrey]

What is normally done in this situation is to remove the bolts that you can first. Then while pulling on the pump, back out the other ones as the pump comes loose. Reinstalling would be just the opposite making sure you don't cross thread the bolts going in.

It's bad engineering, which I have found on Yanmar in several places.

Enjoy!