Kohler COMMAND PRO CS10, Руководство по обслуживанию

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3.4
Section 3
Troubleshooting
Kohler Part No. 25 761 05-S is a relatively simple,
inexpensive leakdown tester for small engines. The
tester includes a quick disconnect for attaching the
adapter hose and a holding tool.
Test the cylinder leakdown as follows:
1. Run engine for 3-5 minutes to warm it up.
2. Remove spark plug and air filter from engine.
3. Rotate crankshaft until piston (of cylinder being
tested) is at top dead center (TDC) of the
compression stroke. You will need to hold engine
in this position while testing.
a. If the PTO end of the crankshaft is accessible,
the holding tool supplied with the tester can be
used. Loosen the holding tool screws and
expand the opening. Slide the tool onto the
crankshaft as close as possible to the PTO
face of the crankcase. If the slot in the tool can
be aligned with one of the holes on the PTO
face, find a bolt of appropriate length and
thread size. Insert the bolt through the slot,
and thread it into the selected hole, to prevent
the tool from moving. Tighten the screws to
lock the holding tool onto the crankshaft. If a
PTO face hole is not accessible, tighten the
screws to lock the holding tool onto the
crankshaft. Insert the end of a 3/8" breaker bar
into the slot, so the handle of the breaker bar
is perpendicular to the crankshaft.
Leakdown Test Results
Air escaping from crankcase breather .......................................... Defective rings or worn cylinder walls.
Air escaping from exhaust system ................................................ Defective exhaust valve.
Air escaping from carburetor ........................................................ Defective intake valve.
Gauge reading in “low” (green) zone ............................................ Piston rings and cylinder in good condition.
Gauge reading in “moderate” (yellow) zone .................................. Engine is still usable, but there is some wear
present. Customer should start planning for
overhaul or replacement.
Gauge reading in “high” (red) zone ............................................... Rings and/or cylinder have considerable wear.
Engine should be reconditioned or replaced.
b. If the flywheel end of the engine is more
accessible, you can use a breaker bar and
socket on the flywheel nut/screw or a flywheel
holding tool to hold it in position. When using
these methods, you will need an assistant to
hold it during the test.
c. If the engine is mounted in a piece of
equipment, you may be able to hold it by
clamping or wedging a driven component. Just
be certain the engine cannot rotate off of TDC
in either direction.
4. Install the adapter into the spark plug hole, but do
not attach it to the tester at this time.
5. Connect an adequate air source (70-100 psi) to
the tester.
6. Turn the regulator knob in the increase
(clockwise) direction until the gauge needle is in
the yellow “set” area at the low end of the scale.
7. Connect tester quick-disconnect to the adapter.
Note the gauge reading and listen for escaping air
at the carburetor intake, exhaust outlet, and
crankcase breather.
8. Check your test results against the table below: