Geely JL481Q, Руководство пользователя, Страница: 57 / 198

7 Check axial clearance of camshaft (Fig. 102);
a) Assemble the camshaft;
b) Use dial gauge to measure axial clearance while moving the
camshaft forwards and backwards;
Standard axial clearance:
Intake: 0.030-0.085mm;
Exhaust: 0.035-0.090mm;
Maximum axial clearance: 0.11mm.
If axial clearance is larger than the maximum value, replace
camshaft, replace the entire set of bearing cap and cylinder head
if necessary.
8 Check backlash of the camshaft gear
a) Mount the camshaft, but without the exhaust cam
auxiliary gear.
b) Use dial gauge to measure backlash (Fig. 103):
Standard backlash: 0.020-0.200mm;
Maximum backlash: 0.30mm.
If the backlash exceeds maximum value, replace the camshaft.
10. Check valve tappet and tappet pore diameter
(1) Use inside micrometer to measure tappet pore diameter of
cylinder head (Fig. 104).
Tappet pore diameter: 31.000-31.025mm.
(2) Use micrometer to measure tappet diameter (Fig.
105). Tappet diameter: 30.966-30.976mm
(3) Calculate oil clearance
Subtract measured tappet diameter from measured tappet pore
diameter.
Standard oil clearance: 0.015-0.055mm
Maximum oil clearance: 0.07mm.
If oil clearance is larger than the maximum value, replace tappet.
Replace cylinder head if necessary.
11. Check planeness of junction surface of intake
manifold and exhaust manifold. Use precision
ruler and feeler gauge to measure planeness of
the surface contacting with cylinder head (Fig.
106).
Planeness of intake manifold plane: 0.080mm.
Planeness of exhaust manifold plane: 0.080mm.
Fig. 102 Check axial clearance of camshaft
Fig. 103 Use dial gauge to measure backlash
Fig. 104 Check and measure valve tappet pore diameter
Fig. 105 Check and measure the diameter of valve tappet
12. Check cylinder head bolt
When outer diameter is less than the minimum value, replace
cylinder head bolt (Fig. 107):
Standard outer diameter: ?8.575 ± 0.03mm.
Minimum outer diameter: ?8.47mm.
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