Small oil leak on crankcase

[sambuca125]

Hi everyone,
I had an accident near 3 months ago and now I've healed enough physically I'm taking a closer look at the smaller damages to my bike. The main damages were repaired at a workshop after the accident but there are a couple of small issues still.

One of the bolts holding the crankcase in place has been forced slightly by the impact and its seal has been broken. Very little oil comes out, at most a small bubbling when the engine's been revved a few times, but I can feel pressured air puffing out of it. Is this a significant problem, or can it be let be? The bike seems to operate fine but I'm no mechanic, I don't know how a small pressure release could affect the engine's performance.

Many thanks!

[Ice Burger]

A leaky crankcase is definitely worth fixing. It holds onto the oil which is the lifeblood of the motor and transmission.

Whatever bike you have, put in a google search for crankcase gasket specific to your bike and whether it's the left hand side or RHS of the crankcase.

I say undo all the bolts, replace the damaged one and put in a new gasket, that should stop it leaking.

[Fisty]

Replace the bolt and the seal, it's not rocket science.
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[Riejufixing]

[sambuca125]

To everyone who's replied, here's a video of the leak.

As you can see the bolt won't be that easy to get off, but I'll find a way if need be. By seal, I just mean the opening is no longer sealed by the bolt. But as I said, the actual oil leakage is next to nothing (and even less since I took this video as I've shifted the bolt slightly). My main concern is the air leak...

You guys think anything actually needs replacing? I don't think the gasket is damaged. Maybe just a case of taking apart and putting together again?

Thanks all

Edit: pretty sure that video didnt work so heres a pic too.

[Riejufixing]

Can't see the video, but I have sound (a bit like a steam engine).

What bike is it? Where's the "air puffing from"?

[Nobby the Bastard]

That case looks cracked.


Edit: Actually on looking at it on a big screen that bolt looks bent and is recessed into the casing.

Thats why iot's almost impossible to get a socket on it.
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[sambuca125]

[stinkwheel]

Bolt looks bent, cover looks cracked through the lug. Should just be the alternator under there though, shouldn't be pressurised, I wouldn't expect air movement in that area.

Might just need a new bolt, the apparent crack could also be a casting flaw.
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[sambuca125]

[Riejufixing]

[Riejufixing]

[Riejufixing]

[sambuca125]

If there's no leak from the crankcase gasket you could do that, perhaps using plain washers and some silicone sealant, but it's a frightful bodge [/quote]

At this point the whole bike is a bit of a bodge
but if it works, it works. What you said here is about the best I can do at the moment. Taking it apart should give me a better idea of the damage. I don't think the flange has been recessed into the casing; it was impossible to get a socket on before the damage too, but the coating on the crankcase is cracked and it could be cracked all the way through like you guys said. Bolt could be bent.

Basically the bolt has been dislodged and has left a small gap in its shaft where the oil and air are coming from, as the flange isn't totally flush with the casing.

[MCN]

[Easy-X]

How much is a replacement side cover, gaskets + new set of bolts? Assuming the main crank case isn't damaged as well.
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