Compression Pressure Inspection |
If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure. |
1. |
Warm up engine to normal operating temperature(80~95°C(176-203°F)). |
2. |
Disconnect the LH/RH ignition coil connectors (A) and then remove the ignition coils. |
3. |
Remove the spark plugs.
Using a 16mm plug wrench, remove the 8 spark plugs. |
4. |
Check cylinder compression pressure.
(1) |
Insert a compression gauge into the spark plug hole. |
(2) |
Fully open the throttle. |
(3) |
Crank the engine over 7 times to measure compression pressure.
Always use a fully charged battery to obtain engine speed of 250 rpm or more. |
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(4) |
Repeat step 1) though 3) for each cylinder.
This measurement must be done in as short a time as possible. |
Compression pressure :
1,078kPa (11.0kg/cmx, 156psi)
Minimum pressure :
931kPa (9.5kg/cmx, 135psi)
Difference between each cylinder :
98kPa (1.0kg/cmx, 14psi) or less
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(5) |
If the cylinder compression in 1 or more cylinders is low,
pour a small amount of engine oil into the cylinder through the spark
plug hole and repeat step 1) through 3) for cylinders with low
compression.
A. |
If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged. |
B. |
If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage past the gasket. |
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5. |
Reinstall the spark plugs.
Tightening torque :
14.7 ~ 24.5 N.m (1.5 ~ 2.5 kgf.m, 10.8 ~ 18.1 lb-ft)
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6. |
Install the ignition coils and ignition connectors. |
Specifications
DescriptionSpecificationsLimitGeneralTypeV-type, DOHCNumber of cylinders8Bore96mm (3.7795in)Stroke87mm (3.4252in)Total displacement5.038 cc (307.3 cu.in)Compression ratio11.5 : 1Fi ...
Troubleshooting
SymptomSuspect areaRemedyEngine misfire with abnormal internal lower engine noises.Worn crankshaft bearings.Loose or damaged engine drive plate.Replace the crankshaft and bearings ...