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6. CYLINDER HEAD/VALVES
SCHEMATIC DRAWING
DOWNTOWN 300i
6-1
6. CYLINDER HEAD/VALVES
SERVICE INFORMATION
GENERAL INSTRUCTIONS
DOWNTOWN 300i
•
The cylinder head can be serviced with the engine installed in the frame. Coolant in the radiator
and water hoses must be drained.
•
When assembling, apply molybdenum disulfide grease or engine oil to the valve guide movable
parts and valve arm sliding surfaces for initial lubrication.
•
The valve rocker arms are lubricated by engine oil through the engine oil passages. Clean and
unclog the oil passages before assembling the cylinder head.
•
After disassembly, clean the removed parts and dry them with compressed air before inspection.
•
After removal, mark and arrange the removed parts in order. When assembling, install them in
the reverse order of removal.
SPECIFICATIONS
Item
Valve clearance (cold)
Standard (mm)
0.10
0.10
16 kg/cm²
34.2987
34.1721
10.00�½�10.015
10.00�½�10.015
9.972�½�9.987
9.972�½�9.987
1.2
1.2
4.990�½�4.975
4.970�½�4.955
5.00�½�5.012
5.00�½�5.012
0.010�½�0.037
0.030�½�0.057
IN
EX
Cylinder head compression pressure
Camshaft cam height
Valve rocker arm I.D.
Valve rocker arm shaft
O.D.
Valve seat width
Valve stem O.D.
Valve guide I.D.
Valve stem-to-guide
clearance
TORQUE VALUES
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
SPECIAL TOOL
Valve spring compressor
E063
6-2
6. CYLINDER HEAD/VALVES
TROUBLESHOOTING
DOWNTOWN 300i
•
The poor cylinder head operation can be diagnosed by a compression test or by tracing engine
top-end noises.
Poor performance at idle speed
•
Compression too low
Compression too low
•
Incorrect valve clearance adjustment
•
Burned or bend valves
•
Incorrect valve timing
•
Broken valve spring
•
Poor valve and seat contact
•
Leaking cylinder head gasket
•
Warped or cracked cylinder head
•
Poorly installed spark plug
Compression too high
•
Excessive carbon build-up in combustion
chamber
White smoke from exhaust muffler
•
Worn valve stem or valve guide
•
Damaged valve stem oil seal
Abnormal noise
•
Incorrect valve clearance adjustment
•
Sticking valve or broken valve spring
•
Damaged or worn camshaft
•
Worn cam chain tensioner
•
Worn camshaft and rocker arm
6-3
6. CYLINDER HEAD/VALVES
Remove four nuts attaching to the cylinder
head.
Remove two bolts attaching to the camshaft
gear.
Remove the camshaft gear from the cam
chain.
DOWNTOWN 300i
Nuts
＊
•
Diagonally
loosen the cylinder head
cap nuts in 2 or 3 times.
Bolts
Remove the set plate located beside the
rocker arm shaft.
Set Plate
6-5
6. CYLINDER HEAD/VALVES
Remove the rocker arm with bolt as shown.
DOWNTOWN 300i
Rocker Arm
CAMSHAFT INSPECTION
Check each cam lobe for wear or damage.
Check each camshaft bearing for play or
damage. Replace the camshaft assembly
with a new one if the bearings are noisy or
have excessive play.
Rocker Arm
＊
If
the surface of rocker arm is worn,
check each cam lobe for wear or
damage.
Camshaft
Bolt
CYLINDER HEAD REMOVAL
Remove the muffler.
Remove the throttle body.
Drain the coolant from the radiator and water
hose, then remove the thermostat water
hose.
Remove the camshaft.
Remove the Temp/Map Sensor and intake
manifold.
Remove the bolt attaching the thermostat
housing and the thermostat housing.
Remove the cylinder head.
Thermostat
6-6

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