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Oil Pump - put my mind at rest

 
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Mark_C



Joined: 28 Sep 2018
Posts: 20
Location: Northampton UK

PostPosted: Sun Mar 24, 2019 3:40 pm    Post subject: Oil Pump - put my mind at rest Reply with quote

My fairly recently acquired LT has spent the last few months in various pieces undergoing a winter refurb. I’ve changed the clutch, lubed the splines, overhauled the brakes, repainted most of the cycle parts, replaced breather and vacuum hoses, cleaned the throttle bodies and injectors, replaced clutch and throttle cables, new tyres, recovered the seat, master cylinder rebuild, the list goes on and on but doesn’t include an oil/water pump rebuild.

The result of all this is a fine running machine that is a pleasure to ride together with an empty bank account!

While the bike was standing over the whole winter I noticed maybe three or four drips of an oil/water emulsion form beneath the pump weep hole. However, since running the bike for about 300 miles after the refurb no more drips have appeared either over night or whilst ticking over on the main stand. There is however a very slight leak because after every ride the area immediately around the hole is just a little wet with oil. Not enough to form a drip, but still visible.

Is this normal? Do they all do that Sir? I wouldn’t normally worry much about this but next month I’m planning a 1500 mile tour of Scotland and want to put my mind at rest this is not going to suddenly let go. I will get round to rebuilding the pump eventually but ideally I need a break from spannering (and spending) on this for a while.
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Flying Duck
PsyKotic Waterfowl


Joined: 27 Jan 2005
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PostPosted: Sun Mar 24, 2019 5:41 pm    Post subject: Reply with quote

Go for a short ride to get it warmed up and immediately look at the oil sight glass when you stop. If you see frothy bubbles in there then it's coolant and you have a pump issue.
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Mark_C



Joined: 28 Sep 2018
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Location: Northampton UK

PostPosted: Mon Mar 25, 2019 1:57 pm    Post subject: Reply with quote

No frothy bubbles in the sight glass. This is what I get after each ride. Bad enough to fix yet or can I get away with this for another 1500-2000 miles??

[img]135 by Mark C, on Flickr[/img]
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Mark_C



Joined: 28 Sep 2018
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Location: Northampton UK

PostPosted: Sun Mar 31, 2019 8:26 am    Post subject: Reply with quote

Got it in bits now. Would you say this is reusable, or should I replace. They are not cheap....

[img]005 by M, on Flickr[/img]
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Scott_Anderson
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Joined: 05 Sep 2006
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PostPosted: Sun Mar 31, 2019 8:43 am    Post subject: Reply with quote

I would probably replace that.....
Have you checked with Motoworks, they may have a good used complete pump cheaper than getting 'the shaft' from BMW. ---pun intended-- lol
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Grunter
Flying Brick Rider


Joined: 30 Sep 2015
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Location: North East England

PostPosted: Sun Mar 31, 2019 8:46 am    Post subject: Parts Price Reply with quote

If you going by the prices charged by a BMW dealer then you can expect to have to take out another mortgage. However if you look at the Motorworks web site (I Located near Huddersfield in UK).

They should be able to offer you a used pump complete ready to bolt in place with a 6 month guarantee. Or a rebuilt one which is more expensive and I think has a 12 month guarantee, or the parts to do the work yourself.

Their Web Address is [b]www.motorworks.co.uk
There were slight variations over the years so an accurate description when ordering will be needed.

I have had a look and a good used one ready to bolt on with the 6 month guarantee is £95 plus post usually about£7 to £10. They may come to you in a scruffy condition but it should clean up OK. When compared to a new on at over £500 that is a bargain.
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Last edited by Grunter on Sun Mar 31, 2019 8:58 am; edited 1 time in total
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Mark_C



Joined: 28 Sep 2018
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Location: Northampton UK

PostPosted: Sun Mar 31, 2019 8:57 am    Post subject: Reply with quote

It’s about £30 for the seals but an extra £135 for a new shaft from Motorworks. They used to list a reconditioned pump for £180 but that appears to have been deleted from their website. I was hoping to get away with just the seals but with a fairly big trip looming I guess I can’t take the chance. Don’t really want to fit a used pump. I’m sure Motorworks would swap it out if it leaked, but I haven’t really got the time to do the job twice.

I’ll give them a ring tomorrow.
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Grunter
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Joined: 30 Sep 2015
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PostPosted: Sun Mar 31, 2019 9:08 am    Post subject: Buying used from M/works Reply with quote

I think buying used from them is relatively risk free. I have had a good number of items from them over the years and none have proved to be anything else than 'as described', by which I mean they are good.


What I have bought over the years - as used, are 2 x Hall sensors (different bikes) used master Cylinder and 2 used front brake callipers for a K1100LT I sold last year.

My latest acquisition was a 32/10 ratio final drive for one of my K75 bikes and apart, as I mentioned before, it did arrive very dirty, it is in really good condition. The seals don't leak and the drive is silent (unlike the one it replaced.) I will have no hesitation taking it to Switzerland again this year. (£150 for the drive compared to close on £400 for a rebuilt one is a no-brainer.
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Mark_C



Joined: 28 Sep 2018
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Location: Northampton UK

PostPosted: Sun Mar 31, 2019 2:21 pm    Post subject: Reply with quote

Polished it up with some Autosol and things look a little better. There is no corrosion in the area where the oil seal runs so I think I'll take a punt and try just renewing the seals.

[img]007 by M, on Flickr[/img]

There is a slight nick in the housing mainly in the "gap" between the oil and water seals. Hopefully this won't be a problem.

[img]009 by M, on Flickr[/img]
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Mark_C



Joined: 28 Sep 2018
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PostPosted: Fri Apr 05, 2019 2:49 am    Post subject: Reply with quote

Ok I fitted new seals but when I put the pump back on the block and filled with oil, oil started to run out of the weep hole before even starting the bike!

Pulled the pump again and removed the shaft and it’s obvious what has happened. On installing the shaft, the oil seal has come unseated and is now sitting in the air space between the two seal positions. The seal is the correct way around.

I’m waiting for new seals to arrive so I can have another go.

The shaft must have pushed the oil seal out of place as the shaft went through. I saw on the YouTube videos to lube the seal before drifting in which I did. I think this might have been the problem. Think I’ll drift the next one in dry and then lube it liberally before pushing the shaft through. I’m also going to slide the shaft just past the oil seal and then try and hold it in the air space whilst I drift the water seal in place. I’ll then bring the shaft through all the way using the impeller bolt as before. That way I can see what’s happening to the oil seal as the shaft goes through.

Any other suggestions (apart from buying a new pump - can’t afford one!)
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Mike d
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Joined: 19 Feb 2010
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PostPosted: Fri Apr 05, 2019 12:42 pm    Post subject: Reply with quote

When you put the shaft in did you use a bolt and spacer or did you just drift it in. If the latter there is a high chance that you have damaged the ceramic water seal.

Mike
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Mark_C



Joined: 28 Sep 2018
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Location: Northampton UK

PostPosted: Fri Apr 05, 2019 3:14 pm    Post subject: Reply with quote

Bolt and spacer method. Hopefully bits will arrive tomorrow for attempt number two
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Mark_C



Joined: 28 Sep 2018
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Location: Northampton UK

PostPosted: Tue Apr 09, 2019 2:57 am    Post subject: Reply with quote

Attempt number two seems to have worked. Oil seal installed dry and then shaft pushed through and held flush with the oil seal whilst then drifting in the water seal. Finally shaft pulled through the water seal with the bolt and spacer method.

Started the bike on the ramp and ran until hot and all now dry as a bone. Just need to refit the plastics and take it for a long ride to be absolutely sure.
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Mark_C



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PostPosted: Sun Apr 14, 2019 4:41 am    Post subject: Reply with quote

300 miles in, and pump is completely leak free. Think I can call that job done.
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