Toro 51643 - Engine - Cleaning After Disassembly

Engine Disassembly (cont’d)
Figure 98
10. Remove the two snap rings retaining the piston pin
in the piston.
11. Carefully push out the piston pin and lift the piston
from the connecting rod. The connecting rod
cannot be removed from the crankshaft. Note the
position of the dot on the head of the piston.
Reinstall the piston with the dot in the same
direction.
See Figure 99
Figure 99
NOTE: Before removing the piston rings, note
how they are installed. The hemispherically
notched ends of the rings match the locating pins
in the ring grooves.
See Figure 100.
12.
Use finger pressure to remove the piston rings
from the piston.
RINGS
KNOCK PINS
Figure 100
Engine Cleaning After Disassembly
1. Clean all parts in appropriate solvents according
to the solvent manufacturer’s recommendations.
2. Inspect all parts for wear and damage. Make
3. Remove carbon from cylinder combustion
chamber, exhaust port and piston. Carbon can be
removed with a non-marring scraper. Be careful
not
to damage the cylinder’s chrome plated bore.
See Figure
101
certain that moving parts will move freely.
Figure
101
4. Decarbonize the muffler. Use a scraping tool to
5. If the spark plug is to be reused, clean the spark
6. Clean the air filter element in soap and water.
Moisten the air filter element with clean,
light-weight engine oil before installation.
remove the carbon.
Plug.
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