Hisun HS700UTV-4, Руководство по обслуживанию

Страница: 61 / 388

GENERAL INFORMATION
- 48 -
2. Remove the air filter assembly Open and secure the throttle so it is at its wide-open position.
3. Remove the spark plug.
4. Install the threaded hose adapter from the leak down kit. Then install the leak down gauge
onto the hose.
5. Remove the ignition timing hole cap from the left crankcase cover.
6. Remove the crankshaft hole cap from the right crankcase cover.
NOTE
Because the following test is performed with the cylinder
head cover installed on the engine, the camshaft lobes
cannot be viewed to ensure that the engine is positioned at
TDC on its compression stroke. To determine when the
engine is approaching TDC on its compression stroke, or
whether it is 360°off. Observe the following two indicators
to predict engine position. First, when aligning the index
marks in Step7, listen for pressure building inside the
combustion chamber. Indicating that the piston is moving
to TDC on its compression stroke. Second, view the gauge
on the leak down tester when turning the engine. As the
piston moves toward TDC on its compression stroke,
compression building inside the combustion chamber may
cause the gauge needle to move slightly. If the crankshaft is
360°off, these indicators will not be present.
NOTE
The decompress or mechanism will click loudly once
during each crankshaft revolution. This is normal.
7. Use hex socket on the primary drive gear mounting bolt and turn the crankshaft clockwise
and align the TDC mark on the flywheel with the index mark on the left crankcase cover
Remove the hex socket from the primary drive gear.
8. Perform the following to lock the transmission so the engine remains at TDC on its
compression stroke when performing the leak down test:
WARNING
Do not attempt to lock the engine by trying to use a
tool to hold the Allen bolt on the end of the crankshaft.
Once the combustion chamber becomes pressurized,
any crankshaft movement can throw the tool away
from the engine under considerable force, attempting
to hole the tool can cause serious injury. Engine
damage may also occur to the crankshaft or right
crankcase cover. Lock the engine as described in this
procedure.