Modifying the Stihl 084 oil pump for increased flow

[huskihl]

If my explanation doesn't make sense or is too complicated, please tell me and I'll try and clarify!!

We need moar pics of the disassembled oil pump plz. And better instructions

 

[markds2]

We need moar pics of the disassembled oil pump plz. And better instructions

I'll do my best Kev. Luckily I do have a spare pump that's not in a saw...

 

[huskihl]

I'll do my best Kev. Luckily I do have a spare pump that's not in a saw...

Boooo.

Didn’t realize you had another pump lol. Don’t need more pics. Just teasing ya.

 

[Woodslasher]

Boooo.

Didn’t realize you had another pump lol. Don’t need more pics. Just teasing ya.

You're supposed to tell him that after he does the more advanced write up with better pics.

 

[Scotty Overkill]

Well here I am in my basement chainsaw bunker finally tearing into this 084AV for its long awaited overhaul (I've been gathering up parts here, there and EVERYWHERE for over a year now), I'm pissing around taking the oil pump apart and do a search and BAM....this post comes up instantly.





Great thread Mark, I'll be sure to do this mod on my pump when I put it all back together! Now that I've resurrected this thread, does anyone have this drive gear and metal tang assembly laying around they'd sell me? The gear has chunks out of it and the metal tang is in 4 pieces (should be one piece)! This poor saw musta been through a war.....



Any help with the parts above would be the teets, boys. And Happy New Year!!

 

[Mastermind]

Well here I am in my basement chainsaw bunker finally tearing into this 084AV for its long awaited overhaul (I've been gathering up parts here, there and EVERYWHERE for over a year now), I'm pissing around taking the oil pump apart and do a search and BAM....this post comes up instantly.

View attachment 360004

View attachment 360005

Great thread Mark, I'll be sure to do this mod on my pump when I put it all back together! Now that I've resurrected this thread, does anyone have this drive gear and metal tang assembly laying around they'd sell me? The gear has chunks out of it and the metal tang is in 4 pieces (should be one piece)! This poor saw musta been through a war.....

View attachment 360006

Any help with the parts above would be the teets, boys. And Happy New Year!!

That oil pump drive is a tough one to find buddy.

You can use an 088 drive, and clutch drum. Not as strong, but at least you can use it.

 

[markds2]

Well here I am in my basement chainsaw bunker finally tearing into this 084AV for its long awaited overhaul (I've been gathering up parts here, there and EVERYWHERE for over a year now), I'm pissing around taking the oil pump apart and do a search and BAM....this post comes up instantly.

View attachment 360004

View attachment 360005

Great thread Mark, I'll be sure to do this mod on my pump when I put it all back together! Now that I've resurrected this thread, does anyone have this drive gear and metal tang assembly laying around they'd sell me? The gear has chunks out of it and the metal tang is in 4 pieces (should be one piece)! This poor saw musta been through a war.....

View attachment 360006

Any help with the parts above would be the teets, boys. And Happy New Year!!

Hello Scotty, I believe I may have a spare drive as pictured at home (I need to check though). I'm away traveling until the end of the week and will check when I get home. As Randy says, my own 084 I upgraded to the 088 style (you need to replace the clutch drum as well).

 

[markds2]

I'm also looking for a good genuine OEM 084 cylinder for a saw I have sitting I'm my attic, if anyone has one laying around!

 

[Scotty Overkill]

That oil pump drive is a tough one to find buddy.

You can use an 088 drive, and clutch drum. Not as strong, but at least you can use it.

Thank you sir, I did some reading on doing that swap and that may be what I end up doing.

Happy New Year, buddy!

 

[Scotty Overkill]

Hello Scotty, I believe I may have a spare drive as pictured at home (I need to check though). I'm away traveling until the end of the week and will check when I get home. As Randy says, my own 084 I upgraded to the 088 style (you need to replace the clutch drum as well).

That would be sweet, Mark! LMK if you find it, no big hurry as this saw is a project for rainy and snowy days. I'm gonna get the bottom end back together once it's done in the ultra sonic cleaner snd star tinkering around with the cylinder.

I'll keep an eye open for a cylinder.....

Whats a safe squish for these bigger cc saws? This is the first I've had one of these big boys apart this far....lol

 

[Scotty Overkill]

And Mark, just for clarification, if the little manual oiler plunger has an OAL of 25.90mm, we are to take only .08mm off of the forked end, leaving the finished OAL at 25.82mm? Just making sure before I wreck this thing.....

Where the red arrow is pointedI...

 

[Scotty Overkill]

And one last question....what size is that little o-ring on the white plastic plunger cap at the back of the oiler? Looks to be about a 13.35MM ID × 1MM thickness....

 

[Mastermind]

Whats a safe squish for these bigger cc saws?

.025

 

[Scotty Overkill]

.025

Thankya boss

 

[markds2]

And Mark, just for clarification, if the little manual oiler plunger has an OAL of 25.90mm, we are to take only .08mm off of the forked end, leaving the finished OAL at 25.82mm? Just making sure before I wreck this thing.....

Where the red arrow is pointedI...

View attachment 360030

You need to take .8mm off so take it down to 25.1mm and yes you are correct, grind the ends of the 'fork' where your red arrow is pointed.

 

[markds2]

And one last question....what size is that little o-ring on the white plastic plunger cap at the back of the oiler? Looks to be about a 13.35MM ID × 1MM thickness....

Scotty, Media CAT tells me it is a 13 x 1mm o'ring, part number 9645 945 1300

 

[Scotty Overkill]

You need to take .8mm off so take it down to 25.1mm and yes you are correct, grind the ends of the 'fork' where your red arrow is pointed.

That's pretty much exactly what I did.

 

[Scotty Overkill]

Scotty, Media CAT tells me it is a 13 x 1mm o'ring, part number 9645 945 1300

Yes sir I got that also after a search. Thanks for your help Mark! Saved me some grief with oiling issues, I'm sure. I also took all the dry, cracked, stiff crunchy housing material off the aux oiler cable and oiled it good, I'm going to put a piece of small diameter heat shrink tubing over it to "reseal" it so it keeps some of the dirt at bay. LMK if yiu happen to find those oil oiler parts, if not I'm probably just gonna get the updated spur gear and an 088/880 sprocket.