Valve Clearance Inspection And Adjustment
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Inspect and adjust the valve clearance when the engine
is cold (Engine coolant temperature : 20°C (68°F)) and cylinder head
is installed on the cylinder block.
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In case of removing the high pressure fuel pump,
high pressure fuel pipe, delivery pipe, and injector, there may be injury
caused by leakage of the high pressure fuel. So don’t do any repair
work right after engine stops.
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1. |
Remove the cylinder head cover.
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2. |
Set No.1 cylinder to TDC/compression.
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(1) |
Turn the crankshaft pulley and align its
groove with the timing mark "T" of the lower timing chain cover.
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(2) |
Check that the TDC marks (A) of the CVVT
sprockets are in straight line on the cylinder head surface
as shown in the illustration.
If not, turn the crankshaft one revolution
(360°)
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3. |
Inspect the valve clearance.
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(1) |
Check only the valve indicated as shown.
Measure the valve clearance.
| A. |
Using a thickness gauge, measure
the clearance between the tappet and the base circle
of camshaft.
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| B. |
Record the out-of-specification valve
clearance measurements. They will be used later to determine
the required replacement adjusting tappet.
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Valve clearance
Specification
Engine coolant temperature : 20°C
[68°F]
Limit
Intake : 0.10 ~ 0.30 mm (0.0039 ~
0.0118 in.)
Exhaust : 0.20 ~ 0.40 mm (0.0079
~ 0.0157in.)
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(2) |
Turn the crankshaft pulley one revolution
(360°) and align the groove with timing mark "T" of the lower
timing chain cover.
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(3) |
Check only valves indicated as shown. Measure
the valve clearance.
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4. |
Adjust the intake and exhaust valve clearance.
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(1) |
Set the No.1 cylinder to the TDC/compression.
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(2) |
Mark the timing chains (A) on the timing
marks of the CVVT sprockets.
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(3) |
Remove the front camshaft bearing cap.
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(4) |
Turn the crankshaft pulley 15° clockwise.
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(5) |
Remove the service hole bolt(A) of the timing
chain cover.
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The bolt must not be reused once
it has been assembled.
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(6) |
Release the ratchet of the timing chain tensioner
by pulling the link down using a thin rod.
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(7) |
Remove the exhaust camshaft bearing cap and
exhaust camshaft.
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(8) |
Remove the intake camshaft bearing cap and
intake camshaft.
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When disconnect the timing chain
from the CVVT sprocket, hold the timing chain.
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(9) |
Tie down timing chain so that it doesn't
move.
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Be careful not to drop anything inside
timing chain cover.
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(10) |
Measure the thickness of the removed tappet
using a micrometer.
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(11) |
Calculate the thickness of a new tappet so
that the valve clearance comes within the specified value.
Valve clearance
[Engine coolant temperature : 20°C(68°F)]
T : Thickness of removed tappet
A : Measured valve clearance
N : Thickness of new tappet
Intake : N = T + [A - 0.20 mm (0.0079
in.)]
Exhaust : N = T + [A - 0.30 mm (0.0118
in.)]
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(12) |
Select a new tappet with a thickness as close
as possible to the calculated value.
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Shims are available in 47 size increments
of 0.015 mm (0.0006 in.) from 3.00 mm (0.11 in.) to
3.690 mm (0.1452 in.)
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(13) |
Place a new tappet on the cylinder head.
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(14) |
Hold the timing chain, and install the intake
camshaft and CVVT assembly.
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(15) |
Align the timing marks (A) on the timing
chains and CVVT sprockets.
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(16) |
Install the exhaust camshaft and CVVT assembly
after releasing the ratchet of the timing chain tensioner.
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(17) |
Install the front bearing cap.
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(18) |
Install the service hole bolt.
Tightening
torque :
11.8 ~ 14.7 N.m (1.2 ~ 1.5 kgf.m,
8.7 ~ 10.8 lb-ft)
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(19) |
Turn the crankshaft two turns in the operating
direction(clockwise), and then check that the TDC marks (A)
of the CVVT sprockets are in straight line on the cylinder head
surface.
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(20) |
Recheck the valve clearance.
Valve clearance
[Engine coolant temperature : 20°C(68°F)]
[Specification]
Intake : 0.17 ~ 0.23 mm (0.0067 ~
0.0090 in.)
Exhaust : 0.27 ~ 0.33 mm (0.0106
~ 0.0129 in.)
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Components 1. Camshaft bearing cap 2. Camshaft front bearing cap 3. Exhaust camshaft 4. Intake camshaft 5. Exhaust CVVT assembly 6. Intake CVVT assembly 7. Exhaust camshaft upper bearing 8. Exhaust camshaft ...
Components 1. Cylinder head cover 2. Gasket ...
Hyundai Santa Fe (DM): Repair procedures
Components and Components Location
Cylinder Head Cover. Components and Components Location