Oil weep behind water pump

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Wombat
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Oil weep behind water pump

Post by Wombat » Tue May 12, 2009 8:37 am

Anyone had a problem with that? Mine has a bit of an oil mist around the back of it, but it doesn't seem to be weeping. Expensive fix or just leave it 'til there's a stain on the garage floor?

Bob
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Re: Oil weep behind water pump

Post by idl1975 » Tue May 12, 2009 8:37 am

Wombat wrote:Anyone had a problem with that? Mine has a bit of an oil mist around the back of it, but it doesn't seem to be weeping. Expensive fix or just leave it 'til there's a stain on the garage floor?

Bob
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Re: Oil weep behind water pump

Post by Wombat » Tue May 12, 2009 8:41 am

Not yet. I'll post one up in the next day or 2. When I get 5 mins :lol:

Bob
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Re: Oil weep behind water pump

Post by Wombat » Thu May 14, 2009 7:04 am

According to the Haynes manual, a quite common problem.

anyway gonna book it in for it's 72,000km service soon, so I'll get this fixed and the oil changed in the forks to improve the damping. Thank god for KRudd's $$$$ present =D>

Bob
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Re: Oil weep behind water pump

Post by Wombat » Mon Jun 29, 2009 7:06 am

Bike's in at the shop at the moment getting it's 72,000km service. The oil leak is from a seal on the water pump body. Apparently with age, the seal shrinks and pops out of the groove its 'sposed to sit in causing the leak. Of course YAMAHA in its infinite wisdom makes the seal in an odd size, that you can't get aftermarket readily, and therefore have to buy the whole pump body (at $350AUD a pop and OF COURSE there's none in the country, and it's a 2 - 3 week wait :roll: )

My mechanic said that one guy has had this problem before on a courier TDM900 and the mechanic refitted the seal, stretched back to size and super glued it in place and got 6 months day in- day out courier work use out of it before it started to leak again (I'm figuring that a courier does at least 250kms per day or at least 1000km per week, so we're looking at probably 26,000kms before it leaks again). Will save my pennies and buy a new one in a few months to be ready and waiting.

Everything else, 'cept the rear tyre is ok (he reckons 1500 more kms - Sportec M3 [-X )

If I didn't need the bike to get to work each day, I'd just wait for the new part.

Bob
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Re: Oil weep behind water pump

Post by Mincehead » Mon Jun 29, 2009 3:57 pm

O yea,I`m familier with Yamaha`s ridiculous seal issues on water pumps.
I repaired my MuZ Skorpion/SZR660 water pump seal with a ceramic faced seal from a rotary pump specialist(they are standard sizes)and beefed up the sealing capacities of the spring loaded ceramic and lip seal with a suitably sized o-ring on the shaft,`inboard` of the lip.
Job done and was a ten quid pack of lager and my time!
Saved me over 170 quid for a water pump assembly. :wink:
Good luck with your `running` repair,I`m sure it`ll work if you`re careful with it.
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Re: Oil weep behind water pump

Post by Wombat » Fri Jul 03, 2009 12:19 am

Well....................the repair last half a day before it started to leak oil again. And at a much faster rate than before. Rang the mechanic up and told him and he said that of the half dozen similar cases he's dealt with, mine was the first one to fail straight away (Typical) :cry:

Gonna clean it up and try and get thru "rego" (MOT) today as it's due in 3 weeks. Order the new water pump on Monday and wait for it to come on the boat from Japan :cry: Looks like I'll be cycling to work for the next few weeks. Lucky I've got the Tour de France to inspire me :lol:

To say I'm pissed off is an understatement!

Bob
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Re: Oil weep behind water pump

Post by Wombat » Thu Jul 16, 2009 10:49 am

ThF ......about time.......new water pump unit turned up today so bike is going back in next week to get this all fixed. Also getting the front forks pulled apart and new oil. Ever since I got the bike back from the last service the front end feels a bit loose and jangly in the spring dept. Could just need a looking at and new oil hopefully. Otherwise be on the lookout for an R1 front end. Do any of the later R6 USD set ups fit?

Bob
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Re: Oil weep behind water pump

Post by Wombat » Fri Jul 24, 2009 7:55 am

All fixed, no leaks.

Bob
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Re: Oil weep behind water pump

Post by Wombat » Mon Jul 27, 2009 2:45 am

A few days down the track and still no leaks, so I'm happy. Even fixed the rattly front end too. Mechanic put new oil in the forks and I bumped the spring preload up to the 3rd ring groove from the top. Seems to be more compliant now. Slight prob with the front discs though, they seem to be dragging ever so much, slightly warm when no front brakes applied (slightly warmer than they should be.) My front end must be slightly skewiff 'cos I've always found that I've had to shim the front calipers, and the rear one to mention it? Obviously when they put the forks back together they didn't reshim it, plus I can see the pistons are a bit on the grubby side, so obviously need a clean. Have to search up Honk's thread on servicing brakes.

Bob
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Re: Oil weep behind water pump

Post by Tarwetijger » Mon Jul 27, 2009 12:13 pm

Good thing there is no leak anymore, but too bad the expensive way is apperently the only one to go. :|

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Re: Oil weep behind water pump

Post by arnoldlayne » Tue Oct 16, 2012 10:03 pm

Dead thread revival:

Just had rebuild my water pump to fix a minor coolant drip from the weep hole on my TRX850 . As mentioned above Yamaha doesnt list the mechanical seal as a separate part for the TRX, they suggest the whole pump at ~$350. :shock:

I think its an oversight in the parts manual as there is, no need to buy the whole pump. :wink: Yamaha part number 11H-12438-00 is the correct 'water-side' mechanical seal and fits perfectly, these are readily available on the aftermarket for around $40. Be very careful fitting them as the seal faces are extremely delicate.

For oil leaks, the body oil seal is just an O-ring, but it is an odd size. Any hydraulics shop should be able to help if you take the pump body and old o-ring in with you. Remember to get an oil-safe material (NBR, Nitrile, Viton etc.). There is a shaft oil seal that sits between the 'water side' mechanical seal and the bearing. This seal doesn't come with the 11H-12438-00 kit, lucky mine was in good nick. if you need one, perhaps a hydraulics shop could help?

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Re: Oil weep behind water pump

Post by buzzboi » Tue Nov 26, 2013 1:05 pm

Ok... coming to this thread a bit late, but hoping someone is still keeping an eye on it. (Looking at you particularly Arnold...)

I seem to have developed a coolant leak around the water pump, it pools just under the pump assembly under pressure... does anyone have any tips on how to isolate where exactly my issue may be? Anyway to confirm either the 14 O-rings (in the parts manual) or the 7 O-ring, or the bearing seal which obviously isn't listed.

If it is the mechanical seal, is that under the impeller bearing that we're talking about? (excuse the questions, but I'm trying to figure it out without pulling the bike to bits first, and the manual pics aren't very clear...) If so, that means either a whole new unit, or a complete rebuild (I'm guessing)... does anyone have a part number for that bearing too? If I'm going to the trouble of removing the bearing to replace a seal I'd rather replace the bearing too..

Is there anything else I need to consider to do a rebuild on it?

Thanks for your help guys.
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Re: Oil weep behind water pump

Post by krawiec00 » Sat Aug 28, 2021 8:00 pm

Good day,

Reviving the old thread but it felt like it's a suitable place to post this.

I recently decided to take care of the coolant weep from the water pump area. My understanding was I can either get a whole new water pump assembly or just get all the o-rings and the infamous mechanical seal and replace those myself.
Being cheap and mechanically ambitious I decided to go with the second option. Got the parts, drained the system, removed the water pump, got all the new o-rings installed, and then, the disaster struck!

I can't get the mechanical seal out from the housing, it just won't budge.' So far I was highly unsuccessful using any destructive method I know... And I'm really doing my best not to damage the bearing. Getting the other half of the seal from the impeller is another challenge I'll need to face.
Any tips on how to tackle all that?

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Re: Oil weep behind water pump

Post by Harsh850 » Thu Sep 23, 2021 3:04 pm

krawiec00 wrote:Good day,
I can't get the mechanical seal out from the housing, it just won't budge.' So far I was highly unsuccessful using any destructive method I know... And I'm really doing my best not to damage the bearing. Getting the other half of the seal from the impeller is another challenge I'll need to face.
Any tips on how to tackle all that?
The bearing can be gently removed by hitting from the shaft side using a screwdriver and a small hammer. Then you obtain a seal and can replace it with an aftermarket one. The waterside seal with spring is so specific that I decided to keep it as is, just reinforced it with some sealant (I'm preferring "Voctor Reinz").

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