Question about McCulloch 16 Inch Gas Chain Saw MCC1635AK

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Tightening the chain

Bought a 18 inch Mac 3818 used from a friend chain is loose not sure how to replace or tighten. Also need to know fuel mixture.

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Fuel ratio is 40:1 using modern chain saw oil--not any petroleum base oil like boat motor oil. Be sure to premix fuel and oil in it's own container and to shake vigorously just before filling the saw each time. To remove the chain, loosen the chain adjustment screw several turns CCW, release the chain brake, and remove the side nuts that hold the rear chain cover. The cover will just pull off, then the bar can be pulled rearward somewhat and the chain worked off of the bar. Remove the bar by pulling it outward. Clean the entire area where the bar and chain fit to the engine, then clean the bar oil ports that run from the larger holes out to the chain groove on each side of the bar. Start the engine with bar/chain removed--oil should ooze out of the side port where the bar fits to. If ok, and the chain appears to be relatively unworn, refit everything in the reverse order of removal, making sure that the chain teeth cut toward you on the bottom run, and the chain adjustment tang drops into one of the large oil holes when replacing the cover. Tighten the mounting nuts only finger tight, and adjust the chain screw CW until the chain ceases to droop from the lower side of the bar, yet not so tight that it can't be turned by hand. Tighten the mounting nuts firmly and recheck the chain tension. If ok, and the engine runs well, start the machine and hold the bar tip near some cardboard while running at speed for several moments--it should throw off a thin line of oil onto the cardboard. Use common chain/bar oil available from home centers, hardware stores and saw dealers. Make sure the chain is properly file sharpened. Hope this helps!

Posted on Jun 05, 2010

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