McCulloch MAC 140 - Muffler or Spark Arrester and Exhaust Port

cooling fins must be kept clean or the engine will become
overheated during cutting operations. Cooling fins are easily
cleaned after removing the starter cover and the muffler.
1. Remove the starter cover and clean out the openings. Use
a small wooden scraper to remove dirt and sawdust
packe into the mesh. Use a soft bristle brush to finish .'
cleaning the cover. Make sure the starter shaft turns
fr~ely and easily. ®
2. Scrape all dirt, grass, wood chips, etc. from the cooling
fins on the cylinder head. Use a thin scraper or a stiff
brush.~ :
3. Clean the vanes on the flywheel and the other parts of the
engine that became visible when the starter cover was
removed.
4. When re-installing the starter cover, pull the starter rope
slowly so the starter can engage the flywheel properly.
MUFFLER OR SPARK ARRESTER AND EXHAUST PORT
Periodically it is advisable to remove, clean and inspect the
spark arrester or muffler. At the same time, any carbon
should be removed from the exhaust port. Operating the saw
with a dirty or defective spark arrester can lead to damage to
the engine. Never run the engine without a spark arrester or
muffler.
1. Remove the muffler or cover and spark arrester screen if
utilized.
2. Clean away all carbon deposits with a scraper blade, wire
brush, or by washing with a good solvent. Replace any
broken or damaged element.
3. While the muffler or spark arrester is removed from the
saw, examine the exhaust port for evidence of carbon
around the port. Clean the port as follows:
A. Pull the starter rope slowly until the piston covers the
port completely.
B. Use a wooden scraper and clean in and around the
port. Do not use any metal or sharp-edged tool that
might slip and scratch the piston or rings. ®
C. After cleaning, turn the saw exhaust side down and
blow loose particles away with compressed air. Protect
your eyes during the operation.
15