Apr. 2007
2
-23
DSC48
3.2 SERVICE SPECIFICATIONS
3.2.1 ENGINE BODY
A. CYLINDER HEAD
* Variance of compression pressure among cylinders should be 10% or less.
B. VALVES
C. VALVE TIMING
Item Factory specifi cation Allowable limit
Cylinder head surface fl atness
-
0.05 mm / 100 mm
0.002 in. / 3.94 in.
Top clearance 0.75 ~ 0.9 mm
0.0295 ~ 0.0354 in.
-
Cylinder head gasket thickness Free 1.3 ~ 1.5 mm
0.0512 ~ 0.0591 in.
-
Tightened 1.15 ~ 1.25 mm
0.0453 ~ 0.0492 in.
-
Compression pressure
(When cranking with starting motor)
3.24 ~ 3.73 MPa
33 ~ 38 kgf/cm
2
469 ~ 540 psi
2.55 MPa
26 kgf/cm
2
370 psi
Item Factory specifi cation Allowable limit
Valve clearance (cold) IN. 0.25 mm 0.010 in. -
EX. 0.30 mm 0.012 in. -
Valve seat angle IN. 1.047 rad 60° -
EX. 0.785 rad 45° -
Valve face angle IN. 1.047 rad 60° -
EX. 0.785 rad 45° -
Valve recessing 0.2 ~ 0.5 mm
0.0079 ~ 0.0197 in.
-
Clearance between valve stem and valve guide 0.040 ~ 0.070 mm
0.00157 in. ~ 0.00276 in.
0.10 mm
0.0039 in.
Valve stem O.D. 7.960 ~ 7.975 mm
0.31339 ~ 0.31398 in.
-
Valve guide I.D. 8.015 ~ 8.030 mm
0.31555 ~ 0.31614 in.
-
Item Factory specifi cation Allowable limit
Inlet valve Open 0.140 rad 8° before T.D.C. -
Close 0.611 rad 35° after B.D.C. -
Exhaust valve Open 0.785 rad 45° before B.D.C. -
Close 0.140 rad 8° after T.D.C. -
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