Front sprocket oil seal failure.

Oil seal failure.

I am repairing my bike but am totally baffled as to how the oil seal just went all of a sudden.

What would cause the oil seal behind the sprocket to just let go? it only lets oil out then the engine runs.

I don't want to change the seal for it to happen again, I'd rather fix the cause,

How do I replace the seal properly and what should I check whilst doing it?

Any ideas?

Originally Posted by sv_rory

Oil seal failure.

I am repairing my bike but am totally baffled as to how the oil seal just went all of a sudden.

What would cause the oil seal behind the sprocket to just let go? it only lets oil out then the engine runs.

I don't want to change the seal for it to happen again, I'd rather fix the cause,

How do I replace the seal properly and what should I check whilst doing it?

Any ideas?

have you been undoing the sprocket nut with 6ft bar in the past,as this will have stressed the shaft bearing and seal and may have even bent the shaft

[dizzyblonde]

Check your chain tension. Thoroughly. When on GM2 my sv kept losing oil when on the run. It had a new chain but had been sat a while. We adjusted it before I went on the trip, but when I got back found that half the chain had the correct slack and half the chain was as tight as hell. What it was doing was popping the seal slightly on the tight half and dripping oil a fair bit over 100 miles. Slackened chain off, and it stopped the leak, no problems since.

Sprocket seal is a few quid, round circle thing with a bit of rubber on it. I bought one just in case, never used it.

It's a rarity it happens, but I have proof it does. The rubber if made to kink a little allows oil out as it unseats itself. Slack off, pops back in to correct position.

[muzikill]

Is it seeping from the outside or the inside of the seal?

Originally Posted by dizzyblonde

Check your chain tension. Thoroughly. When on GM2 my sv kept losing oil when on the run. It had a new chain but had been sat a while. We adjusted it before I went on the trip, but when I got back found that half the chain had the correct slack and half the chain was as tight as hell. What it was doing was popping the seal slightly on the tight half and dripping oil a fair bit over 100 miles. Slackened chain off, and it stopped the leak, no problems since.

Sprocket seal is a few quid, round circle thing with a bit of rubber on it. I bought one just in case, never used it.

It's a rarity it happens, but I have proof it does. The rubber if made to kink a little allows oil out as it unseats itself. Slack off, pops back in to correct position.

the thing people dont realize is how much a shaft will move under pressure,if the shaft did not bend it would break,but because the seal is near the bearing this movement is very small and in your case did not apear to do any long term harm,but normally this will shorten the bearing and seal life,( just seen the above post) if it was leaking from the outer edge of the seal then the bearing was moving in the case and that is very bad thing to happen and the amount of stress put on the cases would normally damage the cases,

[muzikill]

When I fitted a new seal in that area during my rebuild I was told to smear some liquid gasket I had on the outer edge of the seal this would help keep it from moving and prevent leaking from the movement in that area. I realised it was good advice due to the fact that the hole where the seal goes in has no designed groove in the casing that would keep the seal in and it has been factory painted all the way in. Anyone who has replaced it will have noticed how easy and loose it goes in.

This advice came from the sv mechanic in the suzuki garage when they realised the part I had ordered.

[dizzyblonde]

GM2 was in 2009, nowt wrong with my bike, shaft, cases, gears or anything else. No harm whatsoever.

Looking for the simple explanations can sometimes be brilliant, saves a big headache. It's not always doom and gloom.

Originally Posted by muzikill

When I fitted a new seal in that area during my rebuild I was told to smear some liquid gasket I had on the outer edge of the seal this would help keep it from moving and prevent leaking from the movement in that area.

This advice came from the sv mechanic in the suzuki garage when they realised the part I had ordered.

its good practice to put some(a smear) liquid gasket round the seal when fitting,but this is not because the seal moves as its a inteference fit,but just to make sure there is no chance of leak,if the seal moves then some thing is causing this

[yorkie_chris]

Seal will leak if nut comes loose

what torque setting should the sprocket nut be tightened to?