Yanmar 1GM10 Water pump - leaking?

[KenMcCulloch]

I have just started to find salt deposits around the flange where the water pump bolts onto the engine block, also directly below that point. I haven't had the engine running to observe what's happening (air in the fuel lines I think, not enough time to start bleeding the thing today) but am wondering if this indicates failed seals at the back of the pump? Any Yanmar experts out there?

 

[FWB]

There is a hole under the pulley/impeller housing which drips water if the seal fails. Unfortunately it drips onto the oil pipes below and corrodes them. Best to check them too.

 

[FWB]

This may be of help Yanmar Help Forums

 

[Pye_End]

Personally I think these pumps are a bit of a pain!

You can take the whole pump off by undoing the 3 bolts. Either take it to somebody to re-new seals and possibly new shaft, or DIY.

After it happened for about the 3rd time to me began to wander if a comlete new assembly was more efficient!

Have a good look at the oil pipes. Somebody here a while ago was suggesting some rubber ones or similar - an excelent idea as the copper ones are expensive, and don't last long once the pump starts leaking.

Now have a Beta and these problems seem to have gone....

 

[mikejames]

This happens. The seals are about £10. The stainless steel water pump spindle which gets grooves where the seals rub grit in is £75. I have had to replace two in about 700 hours running around the Solent. To stop the water dripping on the oil pipes I fitted a mylar sheet between the water pump and the engine block that directs the water drips below the pipes.
I cut three small holes in it for the fixing bolts and a larger one for the shaft. I exchanged a potential damaging water drip for a slight oil seepage, because I partly lose the effect of the rubber O ring that is sealing the pump to the engine block due to the mylar sheet in the way.

It is meant to leak water there rather than back into the engine.

I have had success in sandpapering down the water pump shaft to smooth out the grooving as a stopgap when on a cruise.

I wouldnt go as far as spending thousands on a new engine when the water pump seal is the only part I have had fail and it is relatively easy to DIY fix.

 

[pampas]

Strip the pump down,if you have access to a lathe turn up a new shaft buy the seals from BSL will save a pretty penny have done several . Whilst at it make a spare shaft at the same time. /forums/images/graemlins/grin.gif

 

[KenMcCulloch]

Thanks for the advice and suggestions confirming my suspicions. Strangely reassuring to know that this is not unusual or disastrous!

 

[steve28]

the shaft also wears out due to the roller bearings failing, you can see this if the engine is started for a short period and observing the shaft spinning, it tends to almost do a figure of eight at the end !