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DT400 Oil leak

  • Andy_C
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DT400 Oil leak was created by Andy_C

While waiting for some spares to arrive, the DT has been sat on it's side stand, and I notice that it has been dropping oil.

Pretty sure it is not from the gearbok sprocket oil seal - it looks like it may be comming from the clutch actuator as there is a doplet of oil in the operating arm.

Not been able to find any detailed diagrams, but I assume that the actuator shaft that runs up from the bottom of the engine probably has an oil seal along the way, can someone confirm if this is the case, and whether it can be replaced without stripping the engine.

It is not a big leak just enough to make the underside of the cases oily and drip a little on the grouund.

Thanks.
Yam DT 400 C, Kawasaki H2B, Royal Enfield Himalayan, Triumph 865 Speedmaster - many, many more in my lifetime.....
05 Oct 2022 08:03 #1

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  • AirborneSilva
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Replied by AirborneSilva on topic DT400 Oil leak

Yes it is a seal, I had to replace one on my 76 DT400, not a hard job and no you don't have to split the case. The service manual has the directions on how to do the job.
1976 DT400C
1981 DT175H
1972 DT2 250
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05 Oct 2022 08:54 #2

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  • Andy_C
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Replied by Andy_C on topic DT400 Oil leak

Good to know it is not a difficult job to do - I have looked at the service manual, page 19 shows the exploded diagram, page 18 has the instructions.

I assume that the oil seal is located where the shaft enters the cases - do I need to drain out the gearbox oil before I change the seal?

Need to keep asking as I have not had the bike long so dont know my way around them that well.

Thanks.
Yam DT 400 C, Kawasaki H2B, Royal Enfield Himalayan, Triumph 865 Speedmaster - many, many more in my lifetime.....
05 Oct 2022 09:20 #3

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  • AirborneSilva
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Replied by AirborneSilva on topic DT400 Oil leak

It's been a few years but I'm thinking that if it's leaking oil then yes you will need to drain first, I'm sure I did.
1976 DT400C
1981 DT175H
1972 DT2 250
05 Oct 2022 10:20 #4

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  • Andy_C
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Replied by Andy_C on topic DT400 Oil leak

No problem to drain the oil so had just as well do it.

Been thinking I had just as well replace the gearbox sprocket oil seal and gearshaft oil seal if both can be done without splitting the cases - looks like you can with the gearbox sprocket. not so sure with gearshaft.

No idea how long the bike had been layed up before I go it, so the sprocket may well have rusted and damaged the seal so probably worth taking a look as I hate oil leaks no matter how small.
Yam DT 400 C, Kawasaki H2B, Royal Enfield Himalayan, Triumph 865 Speedmaster - many, many more in my lifetime.....
05 Oct 2022 10:49 #5

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