Measurement of Compression Pressure
1. Warm up engine.
2. Turn ignition switch OFF.
3. Release fuel pressure.
Refer to EC section (ªFuel Pressure Releaseº, ªBASIC SER-
VICE PROCEDUREº).
4. Remove all spark plugs.
lClean area around the plug with compressed air before
removing the spark plug.
5. Disconnect camshaft position sensor harness connector at
the distributor.
6. Disconnect all fuel injector harness connectors.
7. Attach a compression tester to No. 1 cylinder.
8. Depress accelerator pedal fully to keep throttle valve wide
open.
9. Crank engine and record highest gauge indication.
10. Repeat the measurement on each cylinder as shown above.
lAlways use a fully-charged battery to obtain specified
engine speed.
Compression pressure: kPa (bar, kg/cm
2, psi)/rpm
Standard
1,226 (12.26, 12.5, 178)/300
Minimum
1,030 (10.30, 10.5, 149)/300
Difference limit between cylinders
98 (0.98, 1.0, 14)/300
11. If compression in one or more cylinders is low:
a. Pour a small amount of engine oil into cylinders through
spark plug holes.
b. Retest compression.
lIf adding oil improves cylinder compression, piston
rings may be worn or damaged. If so, replace piston
rings after checking piston.
lIf pressure stays low, a valve may be sticking or seating
improperly. Inspect and repair valve and valve seat.
(Refer to SDS, EM-2049 and EM-2051.) If valve or valve
seat is damaged excessively, replace it.
lIf compression stays low in two cylinders that are next
to each other:
a. The cylinder head gasket may be leaking, or
b. Both cylinders may have valve component damage.
Inspect and repair as necessary.
12. Reconnect fuel pump fuse, all fuel injector harness
connectors, and the camshaft position sensor harness con-
nector at the distributor, and then reinstall spark plugs.
SEF215P
SEM486D
COMPRESSION PRESSUREKA24DE
EM-2010
VALVE LIFTER AND VALVE SHIM
1. Visually check contact and sliding surfaces for wear and
scratches.
2. Check diameter of valve lifter and valve lifter guide bore.
Valve lifter outer diameter:
33.960 - 33.975 mm (1.3370 - 1.3376 in)
Lifter guide bore diameter:
34.000 - 34.021 mm (1.3386 - 1.3394 in)
Valve lifter to valve lifter guide clearance:
0.025 - 0.061 mm (0.0010 - 0.0024 in)
If it exceeds the standard diameter or clearance, replace
valve lifter or cylinder head.
Assembly
1. Install valve component parts.
lAlways use new valve oil seal. Refer to ªOIL SEAL
REPLACEMENTº (EM-2021).
lBefore installing valve oil seal, install valve spring seat.
lInstall outer valve spring (uneven pitch type) with its
narrow pitch side toward cylinder head side.
lAfter installing valve component parts, tap valve stem tip
with plastic hammer to assure a proper fit.
Valve Clearance
CHECKING
Check valve clearance while engine is warm but not run-
ning.
1. Remove rocker cover and all spark plugs.
2. Set No. 1 cylinder at TDC on its compression stroke.
lAlign pointer with TDC mark on crankshaft pulley.
lCheck that valve lifters on No. 1 cylinder are loose and valve
lifters on No. 4 are tight.
If not, turn crankshaft one revolution (360É) and align as
above.
AEM410
AEM411
SEM303D
SEM638B
AEM355
CYLINDER HEADKA24DE
Inspection (Cont'd)
EM-2032
3. Check only those valves shown in the figure.
4. Using a feeler gauge, measure clearance between valve lifter
and camshaft.
lRecord any valve clearance measurements which are out of
specification. They will be used later to determine the
required replacement adjusting shim.
Valve clearance (Hot):
Intake
0.31 - 0.39 mm (0.012 - 0.015 in)
Exhaust
0.33 - 0.41 mm (0.013 - 0.016 in)
5. Turn crankshaft one revolution (360É) and align mark on
crankshaft pulley with pointer.
6. Check those valves shown in the figure.
lUse the same procedure as mentioned in step 4.
7. If all valve clearances are within specification, install the fol-
lowing parts.
lRocker cover
lAll spark plugs
ADJUSTING
Adjust valve clearance while engine is cold.
1. Turn crankshaft to position cam lobe on camshaft of valve
that must be adjusted upward.
2. Place Tool (A) around camshaft as shown in figure.
3. Rotate Tool (A) so that lifter is pushed down.
Before placing Tool (A), rotate notch toward center of cylin-
der head (See figure.), to simplify shim removal later.
CAUTION:
Be careful not to damage cam surface with Tool (A).
4. Place Tool (B) between camshaft and the edge of the valve
lifter to retain valve lifter.
CAUTION:
lTool (B) must be placed as close to camshaft bracket as
possible.
lBe careful not to damage cam surface with Tool (B).
5. Remove Tool (A).
AEM382
SEM304D
AEM383
SEM515EB
SEM516EB
CYLINDER HEADKA24DE
Valve Clearance (Cont'd)
EM-2033
