Installing seal in waterpump

[tjandoverguy]

I have a Yanmar 3gm30 f
I am looking for help on installing seal in water pump
I tried putting the seal in hot water but that didn't help
Any advice

[Sailmonkey]

Have you ever installed a lip seal before?

If not, watch some you tube vids, and get ready to find the proper socket to hit gently with a hammer or rock or similar.

[sailorboy1]

Hell you have the pump out, just take it to a machine shop and have them press it in properly.

"hit ..... with a rock" LOL so Stone Age :-)

[Attikos]

I gently tap mine into place with a suitably sized socket and a soft mallet after putting a little silicone grease on it to help it go in. None ever has taken damage from it.

[EmeraldCoastSailor]

I made a wood jig with a hole saw so that I could tap the pump apart. Thanks for the reminder as it is time for me to change my seals. I didn't get to them soon enough and lost a pump a year and half ago.

[DotDun]

Use some impeller lubricant and push it in place. The spring goes towards the water/impeller.

[ullar]

Originally Posted by EmeraldCoastSailor

I made a wood jig with a hole saw so that I could tap the pump apart. Thanks for the reminder as it is time for me to change my seals. I didn't get to them soon enough and lost a pump a year and half ago.

How did you loose that pump? What happened?

[thunderhoof]

I have a Volvo Penta so not sure about the Yanmars but a leaking seal lets salt water into the shaft ball bearings. I pressed the entire shaft apart and replaced 2 seals and 2 bearings.

[SeaSon]

If you can't get it over the shaft end, take a deep breath and relax.

Find a socket with an outer dimension slightly larger than the shaft. Heat the seal gently and force it onto the socket using your vise or board/hammer, chair leg, what ever. Wait 20 minutes or so for the seal to relax to the new dimension. Slide the seal off the socket directly onto the shaft and seat it before it settles back to its original size. Pvc pipe is a nice shaft seal tamper downer.

[belizesailor]

Originally Posted by Attikos

I gently tap mine into place with a suitably sized socket and a soft mallet after putting a little silicone grease on it to help it go in. None ever has taken damage from it.

This^. water pump">Raw water pump seals normally go in easily. They are just a standard lip seal and do not need to be pressed in.

Just keep them true with a properly sized pusher (socket, pvc pipe, wood jig...) and tamp them gently.

Old seals can be pulled out with a pick.

[belizesailor]

Originally Posted by thunderhoof

I have a Volvo Penta so not sure about the Yanmars but a leaking seal lets salt water into the shaft ball bearings. I pressed the entire shaft apart and replaced 2 seals and 2 bearings.

From the pic also looks like a Johnson pump similar to the one used on Volvos. Regardelss, basic anatomy (seals, bearings, shaft, weep hole...) is the same on all sea water pumps I know of.

[ballvalve]

if the shaft is worn like mine was then new seal may not fix it. I replaced the seal with a double lipped seal so the seal lip is now further down the shaft. that was about 3 years back still no leaks.

[belizesailor]

Originally Posted by ballvalve

if the shaft is worn like mine was then new seal may not fix it. I replaced the seal with a double lipped seal so the seal lip is now further down the shaft. that was about 3 years back still no leaks.

Another option is to sleeve the shaft:

http://www.skf.com/us/products/seals...eve/index.html

New shaft for a raw water pump is not that expensive or hard to replace, but sleeving can save lots of time and money on other types of shafts...like sail drive shafts ($$!).