McCulloch Mini and Small CC Chainsaw's

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I don't know how reliable those oil pumps are,but just by looking at them they seem to be quite cheaply made.Also,I don't know if they can be serviced,like taken apart & cleaned,or a diaphragm replaced.I can look into it if you need any further help.

Thanks Edju
Yes, the oil pumps aren't the most sturdy things ever made. I took the pump apart once before when it wasn't oiling. I found out it was missing the o-ring. I replaced it, and after that, it oiled fine... And then it didn't.

I still haven't had time to look at it yet, but I will.
And thanks for the offer. If I need some more help or ideas, I will definitely ask.

M
 
I'd like to make a running saw from these 2 Macs but it's clear to me how interchangeable the parts are. One is an "MS1635" made in Taiwan in the 2000's???
The other, I believe, is a factory refurb 3516, made in Mexico. The 3516 is anti-vibe, the 1635 isn't. It says "35cc" on the clutch cover and has an EPA sticker that says 38cc.
I've got it in my head that a 3516 means it is 35cc with a 16" bar - is there any truth in that or am I smoking something?
Perhaps MS1635 could be the same deal except the other way around?
 
I've got it in my head that a 3516 means it is 35cc with a 16" bar - is there any truth in that or am I smoking something?
Perhaps MS1635 could be the same deal except the other way around?
You are correct on both accounts. The bizarre thing is that the EPA stickers state "38cc engine" on both saws. I have no idea what was going on at McCulloch at that time, haha.
 
Well now, about that Eager Beaver... The saw cleaned up real nice.
I tried getting some decent pictures of the saw. Here it is sitting on some scrap wood at the "proving ground".

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This was a fun project. Other than a good cleaning, it needed very little to get running again.

M
Looks great! I have one of those saws in HORRIBLE condition, missing parts and mostly broken, but I've salvaged some usable parts.
 
"I have no idea what was going on at McCulloch at that time, "

Seems a lot of folks at McCulloch knew no more then than you do now...

Mark
It's too bad they weren't able to find a way to stay in business, but it seems like those heritage US manufacturers just couldn't do it. Poulan, Homelite, so on, continue on in name only....
 
I've about come to the end of my rope with the E.B.2.1 not oiling.I went to the hardware store the other day & got an O ring for the base of the pump.All they had was one that was 7/8 in.in diameter which I don't believe was the right size.I'm not buying 100 of them from McMaster Carr either.I got the new pump parts from Mark today (yes,the USPS delivered packages today - Sun.).I've got one more thing to try,then I put the yellow devil in a box & maybe take it out in 5 yrs.if I'm still alive.
 
I've about come to the end of my rope with the E.B.2.1 not oiling.I went to the hardware store the other day & got an O ring for the base of the pump.All they had was one that was 7/8 in.in diameter which I don't believe was the right size.I'm not buying 100 of them from McMaster Carr either.I got the new pump parts from Mark today (yes,the USPS delivered packages today - Sun.).I've got one more thing to try,then I put the yellow devil in a box & maybe take it out in 5 yrs.if I'm still alive.

020 o-ring is 7/8 ID -- 1" OD .
021, which I believe is what Minis use was 15/16 ID -- 1" 1/16 OD. (or was it 022?)
I think that these saws share the same o-ring size for the pump base.

Edju, I don't if this helps you, but here is a break down for the inner workings of the 300 series oiler.
It is the same one that Heimannm posted, but is not from a microfiche. (I hope he doesn't mind.)
Again, I don't know if this would help, but there is a very, very short section in the 300 SM that has a run down of the oil system. Have you seen it?


300 Oil System Diagram V2.jpg

M
 
Manic84,I pretty much know the oil pump inside & out,that's what's baffling me.In theory the pump should work,but it doesn't.When I tried a dummy line into the top of the tank,I could see the oil being drawn from the tank through the line,but the piston & other internals were missing.Now that I have the new parts I can re-try to see if the existing line may have a hairline crack.The only other alternative to putting it away in a box as a time capsule is to take it out back for target practice.
 
It looks like the only thing that could prevent oil from getting to the bar pad would be if the check valve to the tank wasn't working. Is it possible to confirm it doesn't allow backflow from the pump to the tank line?
 
It looks like the only thing that could prevent oil from getting to the bar pad would be if the check valve to the tank wasn't working. Is it possible to confirm it doesn't allow backflow from the pump to the tank line?
I said a few posts back that I didn't think the tank was venting.Where is the vent on the oil tank & how do I unplug it?I thought the tank vented through the oil cap?
 
I said a few posts back that I didn't think the tank was venting.Where is the vent on the oil tank & how do I unplug it?I thought the tank vented through the oil cap?
Easiest way to rule that out is try pumping the manual oiler with the cap off.
I'm not sure about an Eager Beaver, but a Mini Mac has a vented cap (on OLD models) or on the later ones I honestly don't know. The fuel tanks are vented with, I kid you not, a pinhole in the top of the tank covered by a piece of felt.
You said you now have a new pump from Mark with all the internals? If you disconnect the rubber line from the bar pad, does oil come out of the line?
 
Family photo of my current collection of small Macs in running order. From left to right: Mini Mac 6, Mini Mac 25, Mini Mac 30, Mini Mac 35, Super Pro 40. Walbro MDC carbs in all of them except the SP40, which has a Zama. 3 saws with chain brakes, and 2 for living dangerously.

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If you asked which of these saws had any special importance to me, it's the banged-up oily MM30. It was my first saw and ONLY personally owned saw for the better part of 15 years. I used that Mini Mac 30 for everything from trimming, breaking ATV trails, to cutting stumps lower to the ground (which wasn't easy with the original 12" bar!).
Ol' dirty thirty has been on many adventures with me, and the carb has never been apart.

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