Oil leak from cranckcase sensor or something...

[Yoni159]

I got oil leak from sensor or something i dont know what it is its above the cranckcase.
https://imgur.com/a/0k0pq3S

[CROSSBOLT]

Pretty messy, will have to clean off really well then watch to see where it starts coming out.

[Yoni159]

I know where it comes from its comes from the black wire on the cranck case you can see i the picture on the left side you could see a black wire. But why its leaking?

[Yoni159]

Update its a stator wire.. but what can i do to stop the leak?

[scooterfan]

It doesn’t look that bad. Probably just a slight oil “sweat” at a seal which started long ago. If there is no oil dripping on the floor I would just clean everything an keep an eye on it more regularly in future.

[Yoni159]

Its not look bad because i cleaned it . But i can put a rtv glue around it?

[mousejunks]

This happens when the plastic stator connector goes brittle from heat and then oil leaks out. There is no gasket around that connector so the leak is inevitable.

You can use a gasket maker such as Permatex Black for maximum oil resistance.

[scooterfan]

The plastic stator connector is probably just a lower point at the housing and I don't think it normally gets in contact with oil. The oil is probably leaking at the crankshaft oil seal, or an engine gasket elsewhere. If so it might be better to leave the stator connector as is. If the leak is bad and you seal the connector properly I think oil might start building up inside the housing and this could cause more problems.

[Yoni159]

This happens when the plastic stator connector goes brittle from heat and then oil leaks out. There is no gasket around that connector so the leak is inevitable.

You can use a gasket maker such as Permatex Black for maximum oil resistance.

is it safe? The glue cant get inside ?

[mousejunks]

Definitely leaking from the plastic plug/insert that holds the stator wires and crankshaft position sensor. I have attached a pic that shows the plastic insert relative to the crankcase cover. There is a thin paper gasket runs all around the edge of the cover except the plastic part. There is no gasket or sealant around that area. It simply goes hard from heat and oil can leak out while the engine is running.

I wouldn't worry about to much, oil can't leak quickly since it is on the top. Clean it and apply gasket maker. If you ever take the crankcase cover off, the gasket maker will work better for the leak but the paper crankcase gasket will rip, so get a replacement beforehand.

Source: 80,000 km on a DT300i and my new DT350i is starting to show a smear from the same location.

[mousejunks]

is it safe? The glue cant get inside ?

No, once the gasket maker cures it is tough and flexible. The gap is too small for gasket maker to go inside.

[Yoni159]

Definitely leaking from the plastic plug/insert that holds the stator wires and crankshaft position sensor. I have attached a pic that shows the plastic insert relative to the crankcase cover. There is a thin paper gasket runs all around the edge of the cover except the plastic part. There is no gasket or sealant around that area. It simply goes hard from heat and oil can leak out while the engine is running.

I wouldn't worry about to much, oil can't leak quickly since it is on the top. Clean it and apply gasket maker. If you ever take the crankcase cover off, the gasket maker will work better for the leak but the paper crankcase gasket will rip, so get a replacement beforehand.

Source: 80,000 km on a DT300i and my new DT350i is starting to show a smear from the same location.

thanks for the explanation. Rtv glue works fine too?

[mousejunks]

Yes, just make sure it is suitable for engines