Author Topic: Pro Mac 610 oil tank repair  (Read 1327 times)

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Offline Bad Xmpl

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Pro Mac 610 oil tank repair
« on: May 13, 2014, 06:30:39 am »
Hey Saw Guys! Good to find this forum!  I've had this old Mac since new in about 77 or so.... Back then I took it to a shop to have it worked on (don't remember what it needed) but when I got it back the oil tank leaked.  It still does but now I have the time to fix it.  Has anyone done this? It's my understanding that the cases have to be split. (GREAT design idea!! LOL)  If anyone could give me a few pointers I'd sure appreciate it!

BTW, I've cut many years worth of firewood with this old thing and it's always started (a little more resistant than any Stihl I've ever owned) but has run hard; still runs hard and still has the original air screen on it. (needs one NOW, tho....) Not bad for a 37 YO saw. 

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Offline fordfairlane78

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Re: Pro Mac 610 oil tank repair
« Reply #1 on: May 17, 2014, 05:19:02 am »
I have not removed an oil tank on a pm610 but have done a bearcat? Which I believe is a newer 55cc version of this design so it should be similar.  If it's the same you won't have to split the case but a lot of disassembling is required.  I used permatex gasket maker to reseal the one I did.  If you have been lucky enough to not have the oiler feed line break, which was the problem with this one, definitely replace the line while you have it apart as they are impossible, at least to me, to change while the tank is intact.

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Offline Bad Xmpl

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Re: Pro Mac 610 oil tank repair
« Reply #2 on: May 17, 2014, 09:06:33 am »
Thanks FF!  I muddled through it already. You're right.  A lot of disassembly but no case splitting.  My Permatex #1 had gotten old so (being impatient) I used Hylomar.  So far so good.  The guy who did it first (30 some years ago) used a regular silicone caulk.  No wonder it leaked from that day forward.  I did commit one "faux paus" though.... I used a hammer to tap/loosen one of the rear "skid plate" screws loose.  Broke the casting at the rear on one side.  Never having seen it I didn't know how thin and weak it was.  Oh, well....  saw starts and runs even better now; can't help but wonder if air was leaking under the carb a tiny bit.  Thanks again! Hopefully this post may help prevent some other newbie from making the same mistake.

Lucky

Offline Bad Xmpl

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Re: Pro Mac 610 oil tank repair
« Reply #3 on: May 22, 2014, 01:56:39 pm »
OK... just in case someone takes my previous suggestion on using Hylomar for an oil tank seal, DON'T.  It did seal for a few days, but then dumped a load of oil. SOOO....  back inside with some Permatex #1 and a "do-over".  Sheesh.


Offline Al Smith

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Re: Pro Mac 610 oil tank repair
« Reply #4 on: May 26, 2014, 03:34:29 am »
Probabley what would work is Loctite 5900 RTV .This is the standard of the world for new engine assembley from Kia  to Rolls Royce .

However the surfaces to be sealed will need to be completely clean of any oil residue before it would work properly .

Offline Bad Xmpl

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Re: Pro Mac 610 oil tank repair
« Reply #5 on: May 27, 2014, 10:58:48 am »
Well, I'm back inside this again; Main problem: no bar oil.  Small hole in the top of the pickup tube. I know it would be kinda 'fudging' but can I just shorten the tube?  It IS decades old, but still flexible. I must have dinged it assembling the tank. OR....  Any suggestions as to what kind of 'hose' to use.  Seems a bit more "plasticy" than vacuum line.  Maybe some small fuel line? Whatchall think?  I hope to solve the tank leak when i back out of this.  Permatex swears their #1 or #2 will work fine in much more extreme environments than this...  I just don't want to spend the 50 bucks for the Loctite.
I would in a heartbeat if I was WORKING this saw, but it's now just more of a "principle" thing. 
Thanks for answers so far!!


Offline Bad Xmpl

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Re: Pro Mac 610 oil tank repair
« Reply #6 on: May 27, 2014, 12:02:02 pm »
OK... I gotta be the most impatient member on this site.  I don't have time to wait for an answer. I DO have time to do stuff twice, though.   ::)

I found some plastic "fuel line" and used that for oil pickup.  Cleaned all mating surfaces with acetone and re-assembled using Permatex #2.  I'll wait a few hrs (24) as suggested before filling with oil, but suspect I'm not gonna see the inside of this thing for a long time. Unless the plastic line melts in a couple days.  By then someone will have provided me with the correct stuff to use.  And I can do this all over again. 

As Paul Harvey used to say:  Hehhhh-heh.


Offline Al Smith

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Re: Pro Mac 610 oil tank repair
« Reply #7 on: May 27, 2014, 10:33:58 pm »
Quite frankly I've never fiddled with the oil lines on a 610 .I own two and have worked on dozens but never on an oiling issue other than a funky oil pump .

Offline fordfairlane78

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Re: Pro Mac 610 oil tank repair
« Reply #8 on: May 28, 2014, 06:14:37 am »
I used tygon on the timberbears I have fixed.  Maybe the older 610's used something tougher than the newer timberbears but I have had to replace the lines on 2 of these. Both I used tygon line & both I used permatex gasket maker. So far no complaints.
Trapped in time, surrounded by evil, low on gas

 

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