Hyundai Accent: Inspection
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1. |
Inspect for flatness.
Using a precision straight edge and feeler gauge,
measure the surface the contacting the cylinder block and the manifolds
for warpage.
Flatness of cylinder
head gasket surface
Standard :
Less than 0.05mm (0.0020in) for total area
Less than 0.02mm (0.0008in) for a section
of 100mm (3.9370in) X 100mm (3.9370in)
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2. |
Inspect for cracks.
Check the combustion chamber, intake ports, exhaust
ports and cylinder block surface for cracks. If cracked, replace the
cylinder head.
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Valve And Valve Spring
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1. |
Inspect the valve stems and valve guides.
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(1) |
Using a caliper gauge, measure the inner
diameter of valve guide.
Valve guide
inner diameter :
5.500 ~ 5.512mm (0.2165 ~ 0.2170in)
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(2) |
Using a micrometer, measure the outer diameter
of valve stem.
Valve stem
outer diameter
Intake : 5.465 ~ 5.480mm (0.2152
~ 0.2157in)
Exhaust : 5.458 ~ 5.470mm (0.2149
~ 0.2154in)
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(3) |
Subtract the valve stem outer diameter measurement
from the valve guide inner diameter measurement.
Valve stem-
to-guide clearance
Intake : 0.020 ~ 0.047mm (0.0008
~ 0.0019in)
Exhaust : 0.030 ~ 0.054mm (0.0012
~ 0.0021in)
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If the clearance is greater than specification,
replace the valve or the cylinder head.
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2. |
Inspect the valves.
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(1) |
Check the valve is ground to the correct
valve face angle.
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(2) |
Check that the surface of valve for wear.
If the valve face is worn, replace the valve.
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(3) |
Check the valve head margin thickness.
If the margin thickness is less than minimum,
replace the valve.
Margin
Standard
Intake : 1.10mm (0.0433in)
Exhaust : 1.26mm (0.0496in)
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(4) |
Check the length of valve.
Valve length
Standard
Intake : 93.15mm (3.6673 in)
Exhaust : 92.60mm (3.6457 in)
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(5) |
Check the surface of valve stem tip for wear.
If the valve stem tip is worn, replace the
valve.
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3. |
Inspect the valve seats.
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(1) |
Check the valve seat for evidence of overheating
and improper contact with the valve face. If the valve seat
is worn, replace the cylinder head.
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(2) |
Check the valve guide for wear. If the valve
guide is worn, replace the cylinder head.
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4. |
Inspect the valve springs.
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(1) |
Using a steel square, measure the out-of-square
of valve spring.
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(2) |
Using a vernier calipers, measure the free
length of valve spring.
Valve spring
Standard
Free height : 45.1mm (1.7756in)
Out of square : Less than 1.5°
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Camshaft
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1. |
Inspect the cam height.
Using a micrometer, measure the cam height.
Cam height
Intake : 44.15mm (1.7382in)
Exhaust : 43.55mm (1.7146in)
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If the cam lobe height is less than specified, replace
the camshaft.
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2. |
Check the cranshaft journal for wear.
If the journal is worn excessively, replace the camshaft.
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3. |
Inspect the camshaft journal clearance.
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(1) |
Clean the bearing caps and camshaft journals.
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(2) |
Place the camshafts on the cylinder head.
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(3) |
Lay a strip of plastigage across each of
the camshaft journal.
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(4) |
Install the bearing caps and tighten the
bolts with specified torque.
Tightening
torque
1st step
M6 bolt :
5.9 N.m (0.6 kgf.m, 4.3 lb-ft)
M8 bolt :
9.8 N.m (1.0 kgf.m, 7.2 lb-ft)
2nd step
M6 bolts :
11.8 ~ 12.7N.m (1.2 ~ 1.3kgf.m, 8.7
~ 9.4lb-ft)
M8 bolts :
18.6 ~ 22.6N.m (1.9 ~ 2.3kgf.m, 13.7
~ 16.6lb-ft)
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Do not turn the camshaft.
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(5) |
Remove the bearing caps.
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(6) |
Measure the plastigage at its widest point.
Bearing
oil clearance
Standard : 0.027 ~ 0.058mm (0.0011
~ 0.0023in)
Limit : 0.1mm ( 0.0039in)
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If the oil clearance is greater than specified,
replace the camshaft. If necessary, replace the bearing caps
and cylinder head as a set.
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4. |
Inspect the camshaft end play.
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(1) |
Install the camshafts.
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(2) |
Using a dial indicator, measure the end play
while moving the camshaft back and forth.
Camshaft
end play
Standard : 0.1 ~ 0.2mm (0.0039 ~
0.0079in)
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If the end play is greater than specified,
replace the camshaft. If necessary, replace the bearing caps
and cylinder head as a set.
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(3) |
Remove the camshafts.
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Continuous Variable Valve Timing (CVVT) Assembly
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1. |
Inspect the Continuous variable valve timing (CVVT)
assembly.
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(1) |
Fix the Continuous variable valve timing
(CVVT ) with its camshaft in a vice.
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(2) |
Check that the CVVT assembly will not turn.
If it is not turned, it is in normal condition.
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(3) |
Apply vinyl tape to all the parts except
the one hole.
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(4) |
Using an air gun, apply the pressure, 147.10kpa
(1.5kg/cm², 21.33psi) in the hole. This makes the lock pin in
maximum retarded state released.
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• |
Wrap around it with a shop
rag, because the oil can splash out..
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• |
After releasing the pin,
you can turn the CVVT assembly for advance by
hand.
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If there was too much air
leakage, the pin can not be released.
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(5) |
Under the condition of 3), turn the CVVT
assembly to the advance angle side with your hand.
Depending on the air pressure, the CVVT assembly
will turn to the advance side.
Also, if the air pressure that wasapplied
was insufficient because of the air leakage from the port, the
lock pin may not release properly.
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(6) |
Except the position where the lock pin meets
at the maximum delay angle, let the CVVT assembly turn back
and forth and check the movable range and that there is no interference.
Standard
: Movable smoothly in the
range about 25°
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(7) |
Turn the CVVT assembly with your hand counterclockwise
and lock it at the maximum delay angle position.
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Identify MLA(Mechanical lash adjuster), valves, valve
springs as they are removed so that each item can be reinstalled in
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Thoroughly clean all parts to be assembled.
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...
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Disassembly
Reassembly