Modifying Oil Pumps

[Mastermind]

Here's a quick how to on a Stihl MS460 oil pump. @mdavlee was the first one I saw post about these mods, so props go to Mike.

The victim......

 

[Mastermind]

The first step to drive out this roll pin.



I just leave it right here, no reason to drive it all the way out. If you're like me.....you would drop it in the floor, and it would enter a alternate universe.

 

[Mastermind]

Then use a flat screwdriver or something to twist under the control bolt, and pop it out.

 

[Mastermind]

Now see how this eccentric is offset?

 

[Mastermind]

We want to increase that offset. To do that, I use a cutoff wheel. I use a new wheel to help keep the corner crisp.

 

[Mastermind]

After......

 

[Mastermind]

What this does is increase the stroke length.....and that produces more oil flow.

Hope this helps.

 

[junkman]

Does the screw head go round and round after the mod and lose the factory stop point doing this ?

 

[Mastermind]

Does the screw head go round and round after the mod and lose the factory stop point doing this ?

No. It doesn't change the stop. I messed up a few pumps trying to get here another way.

 

[jakethesnake]

Silly question. What type lil grinder have you got there. Looks handy for other jobs that require finesse

 

[Mastermind]

Silly question. What type lil grinder have you got there. Looks handy for other jobs that require finesse

That's a Foredom H.28 handpiece.

 

[DrewUth]

Do you think most adjustable oil pumps are similar to this?

 

[Mastermind]

Do you think most adjustable oil pumps are similar to this?

I think this will work on many oil pumps.......yes.

 

[Greenthorn]

Do you think most adjustable oil pumps are similar to this?

I can tell you it works on the ms261!

 

[dall]

can we see a side view of the after please sir

 

[Mastermind]

can we see a side view of the after please sir

Too late Dallas. The oil pump is back together, and reinstalled.

 

[dall]

lol sighs was wondering how much you take off is all

 

[concretegrazer]

I can tell you it works on the ms261!

Good deal.

 

[t4driller]

Which oil pump can be swapped into a 361?? Thought I read it was a 460 pump. Or should I just try and modify mine ? Drives me nuts how stingy it is.

 

[dall]

i think the 046/460 is same design as the 361