Final Drive leaking from plastic capped nut?

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Final Drive leaking from plastic capped nut?

Post by Pete1163 » Fri Aug 09, 2019 9:57 pm

I have a 2006 Ural tourist. It has been for the most part leak free. However today after riding it to the grocery store when I walked out I noticed that there was a leak on the rear final drive. I already wiped everything off from the area of the leak but it was definitely from this nut that has this weird plastic cap on it. The cap felt loose and easily came off. Is this normal? How do I prevent this location from leaking? Any suggestions?
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Re: Final Drive leaking from plastic capped nut?

Post by Pete1163 » Fri Aug 09, 2019 10:05 pm

With plastic cap off
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Re: Final Drive leaking from plastic capped nut?

Post by S 854 » Fri Aug 09, 2019 11:46 pm

That’s your FD dipstick... use a (19mm?) wrench to loosen it then pull it out... they usually weep if’n you overfill the FD by more than 2 or 3 drops...(yes, they’re that particular)

I just put 4 oz of gear oil in and call it good...

Also, make sure your back brake isn’t dragging... that’ll heat up the FD and cause weeping...
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Re: Final Drive leaking from plastic capped nut?

Post by RC20 » Sat Aug 10, 2019 1:36 am

Did they have a combo Dipstick Vent Cap in that era ?

If so its better than the new ones as it will vent high not low (mine has trapped water in it)

If its the vent then it indicates the FD is overfull or hot. Unscrew the nut and check the dipstick.
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Re: Final Drive leaking from plastic capped nut?

Post by Pete1163 » Sat Aug 10, 2019 7:32 pm

So do the new bikes not have a vent? If I needed to replace it would I try to get a vent or no vent?
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Re: Final Drive leaking from plastic capped nut?

Post by S 854 » Sat Aug 10, 2019 11:00 pm

I wouldn’t get a new one... this ones obviously doing it’s job (venting)...

It’s the amount of gear lube that’s the problem (or a dragging brake shoe... can you put your fingers on the rear brake drum without burning them... warm is ok)...

I’d start by draining the FD ... let it drain for awhile... then put precisely 4 oz of your favorite gear lube in... if you’re still weeping after that you may need to go another step...
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Re: Final Drive leaking from plastic capped nut?

Post by windmill » Sat Aug 10, 2019 11:59 pm

Pete1163 wrote:
Sat Aug 10, 2019 7:32 pm
So do the new bikes not have a vent? If I needed to replace it would I try to get a vent or no vent?
They do, just relocated to the case.

The dipstik vent is a little more prone to letting vapor out, and water in than the new style vent, but that can be addressed by threading or JB welding a hose nipple in place of the cap, and running it up under the seat.
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Re: Final Drive leaking from plastic capped nut?

Post by URAL CT » Sun Aug 11, 2019 2:11 pm

What S854 said...let it drain a while! I used to add just 3.5 oz cuz it'd spew some oil if I added 4.5 oz per the manual. Then I discovered that if I let the FD oil drain overnight, I can add 4.5 oz.of FD oil as the manual says...nooo problem. BTW...I do not use the dipstick level, I add the recommended volume of oil per the manual at oil change. I check the dipstick level after adding 4.5 oz & keep a mental note of the level at that time. So far I've not added FD oil till the next oil change. Make sure to check for leaks at the drain plug. In the past I've managed to damage 7 FDs, then I started paying attention to oil leakage. I've done away with the 2WD driveshaft since I do not go off-road any longer. I also keep the speed between 55 to 60 mph. If you wanna go faster get another motorcycle. I have a 2007 Patrol...dunno if the newer Urals are able to maintain faster speeds. I manage to get 130,000 kms on the original motor before it gave up the ghost...killed 7 FDs along that journey. Replaced the motor and now have over 100,000 kms on it without any FD drama. I finally found out how to drive a Ural :mrgreen: . BTW, I've driven the lower 46 of the US mainland with the first motor, still have Florida & So. Carolina to go. Hey Rougaroo...may be heading ur way soon :lol: Met a lot of great Ural folks along the way. Beautiful country and wonderful people.
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Re: Final Drive leaking from plastic capped nut?

Post by Desantnik-VDV » Sun Aug 11, 2019 2:33 pm

I would also measure that old drained oil volume to make right assumptions.
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Re: Final Drive leaking from plastic capped nut?

Post by RC20 » Sun Aug 11, 2019 5:14 pm

So do the new bikes not have a vent? If I needed to replace it would I try to get a vent or no vent?
No, the new FD has a vent but its about 1/3 down the casing.

In my case I think my venting was due to water vapor getting pulled into the FD during a rainstorm after a long fairly hot run of 9 hours or so withi only short breaks. . The trapped vapor gets hot and pushed oil fumes up through the vent.

Will see, I have purged it and new gear lube and will see.

In your case less likely though possible and you want to feel the FD after 10 miles running. Warm to very warm is normal, hot is not.
Last edited by RC20 on Wed Aug 14, 2019 12:21 am, edited 1 time in total.
Fear No Gravel
Formerly Owned: ( various rides on others)
Honda 90
2 x CB750K (one a true Japan Model flown to Hawaii by a P3 Orion Sub Patrol Aircraft!)
1 x CB700 SC ala Shaft Drive Nighthawk S (RC20 is the actual in house production Model)
1 x R80GS (ok to start with, learned to love it for what it was)
1 x CB450K

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Re: Final Drive leaking from plastic capped nut?

Post by Pete1163 » Tue Aug 13, 2019 11:26 pm

So I took a look at the dipstick reading and regardless of if I screwed it in or not, it was over filled by the previous owner. So it looks like it was just venting some excess gear oil. I went out for another ride and it didn't vent again. Regardless, I plan on draining in, flushing it out with some Red Line RED42504 20W-50 Motorcycle Oil and then topping it off with 4.5 ounces of Red Line 58204 Heavy ShockProof Gear Oil that I am waiting to be delivered. Based on other threads on this forum, I think this are the proper things to change the gear lube with. Thanks for all of the great feedback.
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Re: Final Drive leaking from plastic capped nut?

Post by RC20 » Wed Aug 14, 2019 12:24 am

Rather than waste good oil, use diesel. It has lubricity enough at idle. Get it up on the stand and spin the rear for a couple of minutes with diesel in the FD.

Filling I had the same issue, it boiled out during a 10 mile run. the 2014 (I believe) and newer have a different FD. Doesn't matter, fill to the bottom of the dipstick not part way.

I took it home and no more had blown out. With too much lube it gets warmer as well,.
Fear No Gravel
Formerly Owned: ( various rides on others)
Honda 90
2 x CB750K (one a true Japan Model flown to Hawaii by a P3 Orion Sub Patrol Aircraft!)
1 x CB700 SC ala Shaft Drive Nighthawk S (RC20 is the actual in house production Model)
1 x R80GS (ok to start with, learned to love it for what it was)
1 x CB450K

Current:
1 x 2019 cT Terracotta

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Re: Final Drive leaking from plastic capped nut?

Post by vetsurginc » Wed Aug 14, 2019 10:41 pm

windmill wrote:
Sat Aug 10, 2019 11:59 pm
Pete1163 wrote:
Sat Aug 10, 2019 7:32 pm
So do the new bikes not have a vent? If I needed to replace it would I try to get a vent or no vent?
They do, just relocated to the case.

The dipstik vent is a little more prone to letting vapor out, and water in than the new style vent, but that can be addressed by threading or JB welding a hose nipple in place of the cap, and running it up under the seat.
+1 on that. Use a brass nipple fitting and ran a hose up under the seat with a a small filter on the end. Keep the dipstick in the boot. Now I can fill to the recommended amount and never have a spill, and no water entry.
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Re: Final Drive leaking from plastic capped nut?

Post by windmill » Thu Aug 15, 2019 9:51 am

In case some folks don't know. the correct way to measure oil level with the dipstick is, WITH THE DIPSTICK SCREWED IN, not resting on top like one normally would.
Barry

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Re: Final Drive leaking from plastic capped nut?

Post by Peter Pan » Thu Aug 15, 2019 10:32 am

one note. The change from didstick with breather to seperate breather and closed dipstick was made between years 2012 and 2013. I have had final drives of both years and may say that the 2012 throws the oil through the breathing dip stick. My solution is useing felt or cigarette filter for to restrict the breathing hole. That helped well on all breathers. Final drive, gear box and others in other machines. Nearly no water gets in, but vapor can go out.
On the 2012 final drive I added a felt equipped breather at the 2013 position and good bye oil wheep.
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