Author Topic: Mac 110 Hard to turn over  (Read 79 times)

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Offline iamgrampa

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Mac 110 Hard to turn over
« on: July 02, 2018, 06:43:26 pm »
I have a Mac 110 that was bought new in the early 1970's. After quite a bit of use it was retired in favour of a larger Husqvarna 42CC. The little Mac has always been stored cool and dry in its case. I recently decided to clean it up and get it running again. Dismantled the saw, did a nice cleanup and reassemble. The problem I am having is the saw will turn over very easily with NO spark plug, but put a plug in and I can hardly turn it over using the pull cord. The plug is the same one that came out of the saw, a NGKBM6F. This plug does not appear to use a gasket just has the bevelled seat. I have worked on many types of small engines over the years but this problem has got me baffled. Any help would be most appreciated.
Cheers

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Offline Al Smith

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Re: Mac 110 Hard to turn over
« Reply #1 on: July 02, 2018, 10:26:58 pm »
The mini's are bad about having the auto portion of the oiler fail which will hydra lock the cylinder .I've tried to rebuild  the pumps with no success ..What I did was screw the pump piston down so it does not move,block off the oil  going to the pump and just use the thumb oiler .
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Offline iamgrampa

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Re: Mac 110 Hard to turn over
« Reply #2 on: July 03, 2018, 09:25:58 am »
Thanks very much for the prompt reply. I will have a look at that. I am going to have to leave the project for a few days, leaving town for a short trip.

 

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