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Chery QQ Service Manual
Mechanical Part of SQR 472Engine
17 2.7.1 Measure the camshaft with micrometer caliper. If it is below to the specified limit, replace with a new one. Camshaft journal Unit: mm EF Type Item ZL, RL GL, GS, ZS IN φ23.0 -0.02 -0.033
Standard value EX φ23.0 -0.02 -0.033
IN φ22.9 Limit: 0.10 EX φ22.9 2.7.2 Inspection of camshaft axial clearance (1) Replace the camshaft when the axial clearance value measured with dial gauge exceeds the standard value.The axial clearance of intake camshaft is 0.1~0.170mm. The axial clearance of exhaust camshaft is 0.1~ 0.173mm. Limit: 0.18mm.
2.7.3 Inspect the clearance of the engaging tooth of camshaft (1) Install the camshaft into the cylinder head. (2) Confirm the mark forwards on the bearing cap as well as the axle number, and then tighten the bolts. (3) Measure the clearance of engaging tooth of the intake camshaft with dia indicator. Notice: ·Measure at 4 points on the circle of the piston ·Turn the intake camshaft with special tools. the driving gear of the camshaft match with each other. Inspect the clearance of the engaging tooth of camshaft: Item Standard value Limit Single tootj 0.04-0.13 0.30
3. Installation 3.1 Under the circumstance that special tools are used: 3.1.1 Fix the 2 holes (φ6) of the camshaft gear assembly with special tool. 3.1.2 Rotate the driven gear to the right with special tool and tally the mark hole of driven gear with that of camshaft driving gear, or their marking way complies with each other, fix the driven gear with bolts.(Thread: M5; Thread pitch: 0.8)
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