Download SMALL ENGINES 2

Two items must be carefully fitted when replacing the flywheel. First, the flywheel keyway must
fit over the crankshaft key. Second, the cam-like extension located inside the flywheel opposite
the keyway must fit into the notch in the edge of the saucer-shaped unit mounted behind the
crankshaft key. This saucer-shaped unit rotates to open and close the points, while the key drives the flywheel. Even though it may take a few tries to accomplish, the engine will not run
unless both are properly in place.
Afterwards, replace the flywheel nut, use the bracing tool to prevent the flywheel from turning,
and torque the nut down to the specifications listed in the engine manual.
Step S
Begin completing the reassembly by reattaching the flywheel nut cover, the pullstart mechanism, the main shroud, and the recoil. Then inspect the carburetor gasket, and place
it or a new gasket, as required, in position over the carburetor port in the cylinder. Remount the
carburetor and tighten it down, then reconnect the fuel line to the crankcase. Inspect the spark
plug and substitute a new one if necessary. Gap the plug according to the engine's specifications
with a feeler gauge, and use a spark plug socket to screw it into the cylinder head just firm.
Reattach the spark plug wire, and the reassembly is complete.
Review
Ask students to explain why reassembly must be performed in the sequence listed. Review the
four rules listed in the introduction, and the cautions given in the steps above.
Check Your Knowledge
1.
Why is the gasket seal between the cylinder and the crankcase especially critical?
2.
Describe the correct way to tighten down a cylinder head. Why would you torque the head
again after operating the engine?
3.
What two items must be carefully fitted when reattaching the flywheel? What will be the
effect on the engine if this is not done?
4.
What parts should be lubricated during reassembly? Why?
Small Englnes 2; Teacher's Gulde