oil on the good foot

[speedlimit85]

Well, it's leaking again on the good foot -left side. What can I do better? different permatex? let it cure longer? clean the oil residue with more than break cleaner?

[bikerphil]

Hopefully it was just the O-ring. Yes, an impact gun will make life sooooo much easier for alternator rotor removal.

[speedlimit85]

Replaced the o-ring. May have stopped the leak, time will tell...

Really should replace the cover gasket now...

I can borrow an impact wrench if needed.

[speedlimit85]

That is very clear and helpful. I got the o-ring from a local dealer with the part number. I will replace the o-ring first, but it is probably the seal so I'm getting ready.

[bikerphil]

The o ring goes on the plug under the right side cover. Pull the plug straight out with a pliers. It is a super special size o ring unlike the one on the left side.



Yes, the 32x45x8 double lip is correct, better order an extra one just in case.

As for removing the rotor, first remove the bolt that holds the rotor on. Then take the 16mm bolt and thread it into the threads on the rotor. Put a little oil on the threads first. Tighten the bolt down until the rotor pops off. When re-installing the rotor, just tighten it down to spec (47 ft-lb) with the original bolt.

BTW, do not remove the 3 center bolts on the alternator cover, just the 5 around the outer edge. Also, do not run the engine with the alternator cover off. It is the only thing holding that plug in, otherwise the oil pressure will shoot the plug across the shop and there will be oil everywhere.

[speedlimit85]

I got the o-ring. Where does it go? The other side has a bolt below the cover.

Do you replace the seal with an OEM part or 32x45x8 with a double lip from oringsandmore.com ?

And how do you use the bolt?

[bikerphil]

Yep, here is the Yamaha o ring part #...

https://www.partshark.com/oemparts/p...3361-00/o-ring
It's #46 on the parts fiche...

https://www.partshark.com/oemparts/a...70da/crankcase

[speedlimit85]

Woah. That's a lot. I will try the o-ring first.

[bikerphil]

Oil on the bad foot? The seal for the right side is a different size as you know. You will need a 16MM 1.5 pitch bolt at least 50 MM long to remove the alternator rotor. An impact gun makes it a snap, otherwise you will have to somehow hold the rotor from spinning with a large strong screwdriver. On this seal when installing, the seal can only be driven in far enough so it is flush with the outside of the case. One half of the case is deeper than the other so it will end up crooked if you try to send it all the way home. After you get the old seal out and look in there you will see what I mean. It helps to have an extra seal on hand just in case you drive it too far because you will ruin it trying to get it out.

BTW, the right side has an o ring plug that could also be the cause of the leak.

[speedlimit85]

Oil on the other foot? I think the other side has oil seeping out. Is the right side easier or harder to do? I already have the seal.

[bikerphil]

Looks good, better not leak this time.

[speedlimit85]

and left it overnight

[bikerphil]

I see why these are double lipped. They're sealing against the crankshaft twice.

That's what I thought too, until I hammered the seal in and realized the outer lip didn't do anything, it was too far out to hit the crankshaft.

[speedlimit85]

I see why these are double lipped. They're sealing against the crankshaft twice.

[speedlimit85]

Already removed the seal. I will install a new one as best I can.