Author Topic: FREE PORTING PISTON Dolmar 111 & 115 family  (Read 2543 times)

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Offline 660magnum

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Re: FREE PORTING PISTON
« Reply #30 on: April 18, 2013, 12:00:45 am »
When playing with the clutch on the 111i family of chainsaws, the ones with rim sprockets have two different drive set up for the worm gear. Not exactly sure when the change over date was but one ipl proclaims 12-96?

The old worm is metal and the new one plastic. The plastic one has a shadow of the end the clutch hub on the outer end.

The hub of the new style clutch drum has a counter bore that extends over the shoulder on the end of the crankshaft to engage the oil pump worm.

The old style metal worm is a interference fit on the crank and this oil pump system is full time, even when idling and the chain not running. I've had saws like this and you would not notice in normal use.

The new style oil pump drive has the plastic worm with a sintered bronze Oilite bushing inside that floats on the crankshaft and is driven by the hub of the clutch drum. This oil pump only works when the chain is spinning. Possibly a EPA thingy?
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