Oil leak with sprocket cover off !!!
Moderator: rztom
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Oil leak with sprocket cover off !!!
Confused as to why this should happen. Anyone else had the same issue?
Took about six hours to notice it had shed about half an egg cup of gearbox oil with the bike on it's side stand
Hadn't drained the gearbox oil as I saw no reason to.
Looks like the oil came from the hole I've pointed to in the picture.
Doesn't appear to be any O rings or oil seals are needed for the screws
Took about six hours to notice it had shed about half an egg cup of gearbox oil with the bike on it's side stand
Hadn't drained the gearbox oil as I saw no reason to.
Looks like the oil came from the hole I've pointed to in the picture.
Doesn't appear to be any O rings or oil seals are needed for the screws
Yamaha FS1E 1975
Yamaha RD200 1976
Yamaha RD400 1977
Yamaha AS3 125cc 1978
Yamaha AS1 125cc 1979
Honda CX500
Honda MT125cc 1980
Yamaha TZ125G 1981-82
Zeger TC500cc 1983-84
Yamaha RD500LC 1985-87
Honda C90 1989
Yamaha DT175 1993
Yamaha RZV500R 2018
Yamaha RD200 1976
Yamaha RD400 1977
Yamaha AS3 125cc 1978
Yamaha AS1 125cc 1979
Honda CX500
Honda MT125cc 1980
Yamaha TZ125G 1981-82
Zeger TC500cc 1983-84
Yamaha RD500LC 1985-87
Honda C90 1989
Yamaha DT175 1993
Yamaha RZV500R 2018
Re: Oil leak with sprocket cover off !!!
You are right, the same mess happened to me. When you are working on the bike with this cover removed, just turn the screw back in place to avoid this leak.
- jackson.40
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- Location: Cambridge,UK
Re: Oil leak with sprocket cover off !!!
Very common, most people put some thread sealant on the bolt.
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- Joined: Fri Mar 24, 2017 10:08 am
- Location: United Kingdom
Re: Oil leak with sprocket cover off !!!
Thanks for the replies
Drained the oil after it leaked so not an issue now but will remember for the next time
Drained the oil after it leaked so not an issue now but will remember for the next time
Yamaha FS1E 1975
Yamaha RD200 1976
Yamaha RD400 1977
Yamaha AS3 125cc 1978
Yamaha AS1 125cc 1979
Honda CX500
Honda MT125cc 1980
Yamaha TZ125G 1981-82
Zeger TC500cc 1983-84
Yamaha RD500LC 1985-87
Honda C90 1989
Yamaha DT175 1993
Yamaha RZV500R 2018
Yamaha RD200 1976
Yamaha RD400 1977
Yamaha AS3 125cc 1978
Yamaha AS1 125cc 1979
Honda CX500
Honda MT125cc 1980
Yamaha TZ125G 1981-82
Zeger TC500cc 1983-84
Yamaha RD500LC 1985-87
Honda C90 1989
Yamaha DT175 1993
Yamaha RZV500R 2018
Re: Oil leak with sprocket cover off !!!
I just fixed this!!!! Literally fixed it Saturday, I thought I had a leaking gearshift shaft seal or sprocket seal, Bike was leaking ever so slowly, I put some crankcase sealant on it and it seems to be fine..
1985 RZv500
1984 RZ500 Hybrid
1986 RG500 Walter Wolf
1986 RG500 Skoal Bandit
1984 RZ350
1984 RZ350 Hybrid
1981 RD350LC
1981 RD350LC Hybrid
2009 CR500AF Supermoto 250X
2007 CR500AF 250X
1988 YSR50 (2)
1989 VFR750R RC30
1984 GPZ750 Turbo
1984 RZ500 Hybrid
1986 RG500 Walter Wolf
1986 RG500 Skoal Bandit
1984 RZ350
1984 RZ350 Hybrid
1981 RD350LC
1981 RD350LC Hybrid
2009 CR500AF Supermoto 250X
2007 CR500AF 250X
1988 YSR50 (2)
1989 VFR750R RC30
1984 GPZ750 Turbo
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- Posts: 336
- Joined: Fri Mar 24, 2017 10:08 am
- Location: United Kingdom
Re: Oil leak with sprocket cover off !!!
UPDATE
I'm now convinced it's because the two holes arrowed use the sprocket cover bolts to also hold on the gearbox oil cover and when the bolts are removed it lets the oil pump cover relax a little and the oil gets into the holes, hence the little bit of oil we see. What do you think?
I'm now convinced it's because the two holes arrowed use the sprocket cover bolts to also hold on the gearbox oil cover and when the bolts are removed it lets the oil pump cover relax a little and the oil gets into the holes, hence the little bit of oil we see. What do you think?
Yamaha FS1E 1975
Yamaha RD200 1976
Yamaha RD400 1977
Yamaha AS3 125cc 1978
Yamaha AS1 125cc 1979
Honda CX500
Honda MT125cc 1980
Yamaha TZ125G 1981-82
Zeger TC500cc 1983-84
Yamaha RD500LC 1985-87
Honda C90 1989
Yamaha DT175 1993
Yamaha RZV500R 2018
Yamaha RD200 1976
Yamaha RD400 1977
Yamaha AS3 125cc 1978
Yamaha AS1 125cc 1979
Honda CX500
Honda MT125cc 1980
Yamaha TZ125G 1981-82
Zeger TC500cc 1983-84
Yamaha RD500LC 1985-87
Honda C90 1989
Yamaha DT175 1993
Yamaha RZV500R 2018
Re: Oil leak with sprocket cover off !!!
I would think, .... clean that smeary mess behind your cover
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- Posts: 336
- Joined: Fri Mar 24, 2017 10:08 am
- Location: United Kingdom
Re: Oil leak with sprocket cover off !!!
That's why the covers off. Left over from the previous owners
Yamaha FS1E 1975
Yamaha RD200 1976
Yamaha RD400 1977
Yamaha AS3 125cc 1978
Yamaha AS1 125cc 1979
Honda CX500
Honda MT125cc 1980
Yamaha TZ125G 1981-82
Zeger TC500cc 1983-84
Yamaha RD500LC 1985-87
Honda C90 1989
Yamaha DT175 1993
Yamaha RZV500R 2018
Yamaha RD200 1976
Yamaha RD400 1977
Yamaha AS3 125cc 1978
Yamaha AS1 125cc 1979
Honda CX500
Honda MT125cc 1980
Yamaha TZ125G 1981-82
Zeger TC500cc 1983-84
Yamaha RD500LC 1985-87
Honda C90 1989
Yamaha DT175 1993
Yamaha RZV500R 2018
Re: Oil leak with sprocket cover off !!!
I agree with your suggestion. The oil pump cover is 'sandwiched' and uses the clamping force from one of the sprocket cover bolts.ChequeredFlagRacing wrote: ↑Mon Apr 27, 2020 12:57 pm UPDATE
I'm now convinced it's because the two holes arrowed use the sprocket cover bolts to also hold on the gearbox oil cover and when the bolts are removed it lets the oil pump cover relax a little and the oil gets into the holes, hence the little bit of oil we see. What do you think?
Your engine sure will look nice without all that goo...!
Re: Oil leak with sprocket cover off !!!
+1.
The cover will stop the leak.
The cover will stop the leak.
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- Posts: 336
- Joined: Fri Mar 24, 2017 10:08 am
- Location: United Kingdom
Re: Oil leak with sprocket cover off !!!
The goo will be gone soon.
I've had the bike since Nov 18 and just getting around to doing some jobs.
Wanted to ride it last year rather than tinker
I've had the bike since Nov 18 and just getting around to doing some jobs.
Wanted to ride it last year rather than tinker
Yamaha FS1E 1975
Yamaha RD200 1976
Yamaha RD400 1977
Yamaha AS3 125cc 1978
Yamaha AS1 125cc 1979
Honda CX500
Honda MT125cc 1980
Yamaha TZ125G 1981-82
Zeger TC500cc 1983-84
Yamaha RD500LC 1985-87
Honda C90 1989
Yamaha DT175 1993
Yamaha RZV500R 2018
Yamaha RD200 1976
Yamaha RD400 1977
Yamaha AS3 125cc 1978
Yamaha AS1 125cc 1979
Honda CX500
Honda MT125cc 1980
Yamaha TZ125G 1981-82
Zeger TC500cc 1983-84
Yamaha RD500LC 1985-87
Honda C90 1989
Yamaha DT175 1993
Yamaha RZV500R 2018
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- Posts: 336
- Joined: Fri Mar 24, 2017 10:08 am
- Location: United Kingdom
Re: Oil leak with sprocket cover off !!!
And it's goo be gone
Temp bolt put in the oil pump hole that passes when removed. Good practice for next time I have the cover off
Temp bolt put in the oil pump hole that passes when removed. Good practice for next time I have the cover off
Yamaha FS1E 1975
Yamaha RD200 1976
Yamaha RD400 1977
Yamaha AS3 125cc 1978
Yamaha AS1 125cc 1979
Honda CX500
Honda MT125cc 1980
Yamaha TZ125G 1981-82
Zeger TC500cc 1983-84
Yamaha RD500LC 1985-87
Honda C90 1989
Yamaha DT175 1993
Yamaha RZV500R 2018
Yamaha RD200 1976
Yamaha RD400 1977
Yamaha AS3 125cc 1978
Yamaha AS1 125cc 1979
Honda CX500
Honda MT125cc 1980
Yamaha TZ125G 1981-82
Zeger TC500cc 1983-84
Yamaha RD500LC 1985-87
Honda C90 1989
Yamaha DT175 1993
Yamaha RZV500R 2018
Re: Oil leak with sprocket cover off !!!
Haha I also did that
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- Posts: 80
- Joined: Sat Apr 13, 2013 4:36 am
Re: Oil leak with sprocket cover off !!!
I also have this problem : ( when sprocket cover is off , the oil pump cover leaks quite a bit ).
But not only that : It still leaks a little bit when the cover is back ,now ....
I decided to replace the pump cover paper gasket . It is NLA , but I managed to find one on Ebay .
Failing that , Yam-bits has some refabs .
To Remove the pump cover , One needs to remove the generator cover , the flywheel (using a fly-wheel puller )
then remove the generator back cover ...
I put a very thin layer of liquid gasket on both sides of the new gasket , I hope it will make it more "leak-proof" .
When looking ar the 51x workshop manual (page 101 ) , I found that the oil pump cover has a "normal" fourth bolt ,
and that the sprocket cover has no pass-through bolt (!).
The pictures were probably from a pre-production model .
For Production ,Yamaha decided to put a pass-through bolt . My guess is that they wanted to beef up the clutch mechanism .
(the clutch mechanism pushes back on the sprocket cover ).
This shows that the design process of the RD/RZ/RZV was not at all smooth but rather with a lot of backtracking .
(But we knew that already ...)
By correcting a possible problem with the clutch ,they created a leak problem with the oil pump cover .
No wonder the gasket became NLA , as a lot of people probably tried to replace it .
Operation was completed this evening . I will do the oil refill later , and see if the leak is fixed ...
But not only that : It still leaks a little bit when the cover is back ,now ....
I decided to replace the pump cover paper gasket . It is NLA , but I managed to find one on Ebay .
Failing that , Yam-bits has some refabs .
To Remove the pump cover , One needs to remove the generator cover , the flywheel (using a fly-wheel puller )
then remove the generator back cover ...
I put a very thin layer of liquid gasket on both sides of the new gasket , I hope it will make it more "leak-proof" .
When looking ar the 51x workshop manual (page 101 ) , I found that the oil pump cover has a "normal" fourth bolt ,
and that the sprocket cover has no pass-through bolt (!).
The pictures were probably from a pre-production model .
For Production ,Yamaha decided to put a pass-through bolt . My guess is that they wanted to beef up the clutch mechanism .
(the clutch mechanism pushes back on the sprocket cover ).
This shows that the design process of the RD/RZ/RZV was not at all smooth but rather with a lot of backtracking .
(But we knew that already ...)
By correcting a possible problem with the clutch ,they created a leak problem with the oil pump cover .
No wonder the gasket became NLA , as a lot of people probably tried to replace it .
Operation was completed this evening . I will do the oil refill later , and see if the leak is fixed ...