Two different oil seals on ms 039 help please

[Vintage Engine Repairs]

Hi guys,


I got these for my 039 rebuild, clearly they are different to the original.

original is on the right,
New is on left.


I have heard somewhere that it depends if you plan on replacing them when the engine pan is on or off.

does it make any difference? I have the pan off if it does...

I’m guessing either way they will work, but I am keen to understand why / how it makes a difference

thanks in advance.

 

[HarleyT]

Here.
Page 55.
You will love this guide,
save it.

 

[Vintage Engine Repairs]

Fantastic mate. Seeing as my dealer ordered these ones which are designed to not need to split the case and I have the saw apart, so long as the ring on the seal sits outwards, it will still work assembling it with the case halves apart I’m guessing?

 

[HarleyT]

Never gave it much thought.
I would imagine that using those, you will be fine.

 

[Vintage Engine Repairs]

Never gave it much thought.
I would imagine that using those, you will be fine.

Thanks mate, I’ll give it a go interesting the way they are installed in reverse!

 

[HarleyT]

Here...

Same as 039...

 

[Vintage Engine Repairs]

Here...

Same as 039...

You’re fantastic Harley, thanks mate. I have the 039 manual, but the 390 manual is much clearer. Thanks!

 

[Vintage Engine Repairs]

Just a little bump in case anyone has anything to add before I fit these seals soft seals in a few hours.

 

[SteveSr]

Just a little bump in case anyone has anything to add before I fit these seals soft seals in a few hours.

Yea, be sure to use a high temp fully curing sealant like Dirko HT when you put the engine back together. Non-curing, non gap filling products like Motoseal will leak! Although you won't find this out until you have everything back together and are pressure testing the saw!

 

[Vintage Engine Repairs]

Yea, be sure to use a high temp fully curing sealant like Dirko HT when you put the engine back together. Non-curing, non gap filling products like Motoseal will leak! Although you won't find this out until you have everything back together and are pressure testing the saw!

Thanks yep I do exactly that I was just curious if anyone had experienced the soft seals