Engine Compression Inspection - Honda EP3 Service Manual

Cylinder Head
Engine Compression Inspection
1 . W a r m u p t h e e n g i n e t o n o r m a l o p e r a t i n g
temperature (cooling fan comes on).
2. Turn the ignition switch OFF.
3. Remove the intake manifold cover (see step 1 on
page 6-22).
4, Disconnect all four injector connectors.
5. Start the engine, and let it run until it stalls.
6 . R e m o v e t h e i o u r i g n i t i o n c o i l s ( s e e p a g e 4 - 1 8 ) .
7. Remove the four spark plugs.
8. Attach the compression gauge to the spark plug
n o t e .
6-6
V ,
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9 .
1 0 .
Open the throttle fully, then crank the engine with
the starter motor and measure the compression.
Compression Pressure
Above 930 kpa (9.5 kgf/cm', 135 psi)
Measure the compression on the remaining
cylinders,
Maximum vadation
Within 200 kPa (2.0 kgf/cm', 28 psi)
lf the compression is not within specifications,
check these items, then remeasure the
compressron.
. Damaged orworn valves and seats
. Damaged cylinder head gasket
. Damaged or worn piston rings
. Damaged orworn piston and cylinder bore
1 1 .
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