Mechanical Seal Question - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 27 (permalink) Old 10-31-2017, 12:03 AM Thread Starter
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Mechanical Seal Question

So I've taken it upon myself to replace my mechanical seal due to leaking from the weep hole, and ran into some issues.

https://drive.google.com/file/d/0B1L...w?usp=drivesdk

So as I was cleaning out what was behind the seal, this ring started to make its way out... What exactly is it? I cannot seem to find it in the diagrams, and according to the TOC manual, the immediate thing behind the seal is a ball bearing?

Also, the water pump shaft seems to be moving up and down a bit in place, is this normal? It does not move in or out of the engine block however.

I am also seeing some seals sold with a ring, and some sold as just the seal. What is the white ring that is sold with this seal?

http://static.damnlol.com/pics/994/9...da05ce0b30.jpg

Anything else I should be aware of in this process?
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post #2 of 27 (permalink) Old 10-31-2017, 12:49 AM
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Haven't dealt with this seal myself, so I can't offer much. I do know that the play in the shaft is normal, saw it on mine and MTB confirms his was the same way.

You might look for Andrew Roth on youtube, he has a complete engine rebuild in a series of videos. No doubt he has info on the water pump there.

Couldn't view the second link, just got an error notice. (edit: actually neither link worked for me) Are you sure the piece behind there isn't part of the seal? Everyone that's replaced it has reported having to rip it to pieces to get it all removed. There's a chance you might find some pics or info in some older threads.

Google Search: https://www.google.com/search?q=vn75...hanical%20seal

Google Images: https://www.google.com/search?q=vn75...ZcAfAQ_AUICygC

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Last edited by Spockster; 10-31-2017 at 01:10 AM.
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post #3 of 27 (permalink) Old 10-31-2017, 12:57 AM
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Post #9 in the link below is from Andrew, and there's a pic of a ring and another piece....

https://www.vn750.com/forum/31-engine...w-its-not.html

See if those are the same parts you're seeing.

Video link from the same page, it's Andrew's rebuild video dealing with the seal:


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Last edited by Spockster; 10-31-2017 at 01:11 AM.
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post #4 of 27 (permalink) Old 10-31-2017, 12:45 PM Thread Starter
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I took out the part he got out at the 1:35 mark, then cleaned out behind it. Doesn't seem to have any other seals or o-rings in the video....maybe it's just the dexcool buildup? I know it was absolutely disgusting in there with the clay-ish buildup.
Should also mention, the 9mm ring that goes on the impeller shaft was either not there, or melted... it was all black sludge where it should have been....
It's the part he had to take out with the dykes that gets destroyed in the process I think...I know mine did and I know the replacement seal comes with it....

https://www.vn750.com/forum/31-engine...-argument.html

The second post has the photo showing, it has a second piece which is the white and black ring... I believe it goes on the impeller? I did not see such ring behind the seal after ripping it out.

I think I will put it back together and see what ends up happening, but the fact that the seal gets sold as either one or 2 parts got me slightly weirded me out...

The TOC manual also says nothing about the black and white ring in the mechanical seal replacement...

Last edited by SergheiS; 10-31-2017 at 12:50 PM.
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post #5 of 27 (permalink) Old 11-01-2017, 11:55 AM
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Hi ,The main seal with the spring is prised out of the engine case off the shaft. The white ring fixes to the impeller, you have to prise that out too and install a new seal behind it at same time. Be aware there is a sealed bearing behind the spring seal and this can rust up solid and cause problems .

Vn 750 A2 1986 rebuilt engine, crank shaft, half casing,shell bearings,con rods,rear cylinder head,oil pump,water pump ,(had ceased bearing rusted up),tie bar upgrade,clutch basket drilled,front cylinder cam chains,toc springs,stator,shaved, rectifier,agm battery,solenoid ,starter motor (used) re-spray ongoing.
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post #6 of 27 (permalink) Old 11-01-2017, 08:47 PM Thread Starter
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Quote:
Originally Posted by JETHRO View Post
Hi ,The main seal with the spring is prised out of the engine case off the shaft. The white ring fixes to the impeller, you have to prise that out too and install a new seal behind it at same time. Be aware there is a sealed bearing behind the spring seal and this rust up solid and cause problems .
Does the seal on the impeller absolutely have to be replaced? The part I ordered didn't come with it, it is only the mechanical seal.

Speaking of, what is the best way to drive the new seal in? Just hammer with a 28mm socket?
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post #7 of 27 (permalink) Old 11-02-2017, 07:40 AM
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Hi , If the seal on impeller looks good then there's no reason to replace it ,I guess that's why you can buy one half.As for the new seal, Yes drive in with suitable size socket, You will notice there is a blue seal around edge of new part, as engine warms up this will create complete seal.

Vn 750 A2 1986 rebuilt engine, crank shaft, half casing,shell bearings,con rods,rear cylinder head,oil pump,water pump ,(had ceased bearing rusted up),tie bar upgrade,clutch basket drilled,front cylinder cam chains,toc springs,stator,shaved, rectifier,agm battery,solenoid ,starter motor (used) re-spray ongoing.
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post #8 of 27 (permalink) Old 11-02-2017, 11:58 AM Thread Starter
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Quote:
Originally Posted by JETHRO View Post
Hi , If the seal on impeller looks good then there's no reason to replace it ,I guess that's why you can buy one half.As for the new seal, Yes drive in with suitable size socket, You will notice there is a blue seal around edge of new part, as engine warms up this will create complete seal.
I guess one seal it is...

Also, no chance anyone has the torque specs for the impeller nut and the cover? I saw one torque spec list on this forum but wasn't sure which one was for the cover.
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post #9 of 27 (permalink) Old 11-02-2017, 06:24 PM Thread Starter
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https://photos.app.goo.gl/xKxNZKaTgRYKQtzn2

....so it looks like I can see some of the ball bearings....is this normal? Because I'm debating to just risk putting it back together seeing how it does.....


....... I also broke the new seal trying to install it.... Guess I'm waiting on a new one.... Any tips, or any special tool I should use for this? I couldn't get it to go in straight....

Last edited by SergheiS; 11-02-2017 at 07:07 PM.
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post #10 of 27 (permalink) Old 11-02-2017, 10:28 PM Thread Starter
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Update: So the local Kawasaki dealer did have a seal in stock, got a new one there, slowly reinstalled it, assuming successfully...

I reassembled the cover using blue RTV as the gasket. I have to tap new bolt holes for the exhaust, but otherwise, I guess let's see what happens once I can get it going again... Because that bearing did indeed look worn out....

Last edited by SergheiS; 11-03-2017 at 12:18 AM.
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