Huansong UTV 700 2009, Service Manual

Page: 63 / 361

GENERAL INFORMATION
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a. Turn the drive sprocket by hand and shift the transmission into top gear with the shift pedal.
b. Mount a holding tool or equivalent onto the drive sprocket. Use a wooden block and clamp to
hold the holding tool so it cannot move when the combustion chamber becomes pressurized.
c. Check that the TDC marks are still aligned as described in Step7,
If not, turn the crankshaft as required, then relock the holding tool in position.
9. Remove the radiator cap and the oil filler cap.
10. Perform a cylinder leakdown test by applying air pressure to the combustion chamber. Follow the
manufacturer’s instructions while reading the percent of leakage on the gauge. Listen for air
leaking while noting the following:
NOTE
Because of play in the transmission gears, it is unlikely the
engine will stay at TDC on the first try If the crankshaft turns,
reposition the countershaft slightly and then relock it in
position with the holding tool. After several attempts, you will
get a feel of the transmission play and know what direction the
countershaft should be turned and locked.
NOTE
If a large amount of air escapes from the exhaust pipe or
through the carburetor, the air is leaking through on open
valve, Check the index mark to make sure the engine is at
TDC on the compression stroke, If the engine is remaining at
TDC but there is still a large amount of air escaping from the
engine, the crankshaft is off one revolution. Turn the engine
360°and realign the TDC mark as described in Step 7, then
relock it as described in Step8.
a. Air leaking through the exhaust pipe indicates a leaking exhaust valve.
b. Air leaking through the carburetor indicates a leaking intake valve.
c. Air leaking through both the intake and exhaust valves indicates the engine is not set at
TDC on its compression stroke.
d. Air leaking through the coolant filler neck indicates a leaking cylinder head gasket or a
cracked cylinder head or cylinder liner.
e. Air leaking through the oil filler hole indicates the rings are not sealing properly in the
bore.
11. If the cylinder leakdown is 10 percent or higher, further service is required.
12. Disconnect the test equipment and install all the parts previously removed.