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SQR7080 Maintenance Manual
372 Engine Mechanical System
SQR372 Engine
Maintenance Manual
Chery Automobile Co., Ltd.
Forewords
In order to help the technical servicing personnel to have correct understanding and good command of the
cute Chery Model SQR7080 vehicle, and to master the skills for fast repairs and rational maintenance, a
special edition of the "Chery QQ Technical Service Manual—372 Engine Mechanics Division" is
compiled and published.
This Manual gives a detailed description on the dismounting, installating, checks and tests, adjustments
and diagnoses, technical standards and specifications for adjustments and diagnoses of various parts and
components as well as subsystems of Chery QQ 372 engines. This Manual is published by Chery
Automobile Co., Ltd.
Any parts or sections of this Manual shall not be copied or duplicated in whatever form or by whatever
approach without the written authorization of the publisher.
The right of interpreting the Manual belongs to the Service Department of Chery Car Marketing Co. Ltd
Editors
March of 2004
3、Special tools for maintenance:
Outer appearance
Code and Name
Purpose
Mounting onto engine
Auxiliary devices for engine
dismounting and check
dismounting and checks
stand
Dismounting and
Engine dismounting and check stand
installing engine
Camshaft clockwise
Clockwise belt wheel wrench
Ｓ
belt wheel dismounting
Installing crankshaft
Spring bush pulling and removing
oil seal
device
1
Chery Automobile Co., Ltd
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Summary of Contents for Chery SQR372
- Page 1 In order to help the technical servicing personnel to have correct understanding and good command of the cute Chery Model SQR7080 vehicle, and to master the skills for fast repairs and rational maintenance, a special edition of the “Chery QQ Technical Service Manual—372 Engine Mechanics Division” is compiled and published.
- Page 2 Oil seal stand screw driver Outer appearance Code and Name Purpose Remove and install Crankshaft belt wheel fixture crankshaft belt wheel Remove and install Wrench can shaft slave gear wheel Replace throttle spacing, adjust spacing washer Chery Automobile Co., Ltd...
- Page 3 Chapter 2 Timing Blet Service 1. Configuration diagram 1 Water pump pulley 2 Timing belt cover 3 Timing belt 4 Torsion shock absorber 5 Timing pulley damper 6 Tensioner 7 Crankshaft timing pulley ※ ：Non-reusable part Unit：N·m(kg·cm) Chery Automobile Co., Ltd...
- Page 4 Remove with SST,if there are any. 图 29 Please remove with screwdriver wrench accordingly,if there is no SST at hand. Remove torsional vibriation damper (1) Prevent the gear ring from rotating with SST. (2) Remove bolt of torsional vibriation damper. Chery Automobile Co., Ltd...
- Page 5 (3) Make sure that the crankshaft timing pulley wheel mark is aligned with the mark of the oil pump. Timing mark (4) Remove the tensioner bolt, and take off the tensioner Chery Automobile Co., Ltd...
- Page 6 - Service life of belt is short,don’t pollute the belt with grease and water. You have no choice but rotate the engine clockwise after installing the belt. 2.7 Remove the crankshaft timing gear Chery Automobile Co., Ltd...
- Page 7 （２） 、Cracks of teeth roots, cracks clearing off the fabric lining layer; （３） 、Tears and wears of fabric lining layer, missing rear teeth, broken teeth, etc. Chap Tears wears Chap （４） 、Abnormal tears and wears on belt sides Drop-off Abnormal of belt core tears and wears Chery Automobile Co., Ltd...
- Page 8 Diameter of camshaft timing +0.1 φ110.7 -0.2 gear （mm） Diameter of crankshaft timing +0.7 φ54.65 -0.13 gear （mm） 2-3-4 Baffle of crankshaft timing gear Check to see if there is any deformation Standard size of crankshaft clockwisewheel： Wide 28.6mm Chery Automobile Co., Ltd...
- Page 9 Then use screws to fix the clockwise gear, with the torque of 100 ± 5N.m. (2) Make sure that the punched mark on the crankshaft clockwise pulley is aligned with the mark of the oil pump. Timing mark Timing mark （3）Install timing pulley accordingly. Clockwise Chery Automobile Co., Ltd...
- Page 10 Tighten the S/A fixing bolt of the stretcher with the specified torque of 25 ± 3N.m 4 Install the baffle of the crankshafte timing pulley [Attention] Install the baffle towars the direction shown in the right figure. Chery Automobile Co., Ltd...
- Page 11 ① Use SST to prevent the toothed ring from turning ② Then tighten bolt of torsional vibriation damper. 3、Camshaft 3-1 Configuration diagram (the dismounting and installation of the clockwise belt are to be carried out in the following procedures) Chery Automobile Co., Ltd...
- Page 12 Remove cylinder head cover assembly Remove the valve chamber cover cap bolt from two sides to the centre symmetrically. Remove valve chamber cover gasket ② 2 Routine check of valve valve clearance standard： 0.18±0.05 Valve clearing 0.25±0.05 Chery Automobile Co., Ltd...
- Page 13 Clip the camshaft tightly,use pin of SSTto insert the two pin holes of the gear;turn the gear,to keep the bite state of master and slave gear;remove the fixing bolts of slave gear. [Attention] Do not damage the surface of the camshaft. Chery Automobile Co., Ltd...
- Page 14 The air inlet camshat axial clearance is 0.1～0.170mm。 The air exhaust camshaft axial spacing is 0.1 ～ 0.173mm。 Limits for operation：0.18mm 3-4 Cleaning 1、Clear off the spark plug carbon accumulation with a metal brush. Chery Automobile Co., Ltd...
- Page 15 （5） Smear lubricating oil on the camshaft assembly, the gears and the cyliner head axial diameter section. 3 Tighten the camshaft bearing cap shown as right figure. 4 Remove the bolt for fixing the slave gear of the camshaft assembly. Chery Automobile Co., Ltd...
- Page 16 1mm thatn the end surface of the cylinder4 head. Attention ·Under the condition of use the oil seal outside repeatedly,press here with engine oil adhesive agent - The oil seal should not be pressed inclining to one side. Chery Automobile Co., Ltd...
- Page 17 [Attention] The valve number that goes beyond the benchmark value has to be recorded, and the result of measurements should be recorded as welll (1) Use a caliper to measure and adjust the thickness of the separation cushion. Chery Automobile Co., Ltd...
- Page 18 Forword lower (2) Turn the crankshaft and the bulging top of the cam presses down the valve thrusting rod. Valve lifter nick Chery Automobile Co., Ltd...
- Page 19 (1)—(9). 4. Cylinder head 4-1 Configuration diagram (Do the following operations in the procedures for the dismounting and installation of the camshaft) Chery Automobile Co., Ltd...
- Page 20 Valve spring seat Valve spring （9） （10） Iintake valve （11） Exhaust valve （12） Valve oil seal ※： Non-reusable part （13） Valve seat Unit ： N · m(kg · cm) （14） Valve guide 4-2 Dismounting 1、Removal of spark plug Chery Automobile Co., Ltd...
- Page 21 4-4 Routine checks 4-4-1 Cylinder cover 1 Use the straight knife sharp edge ruler to measure the levelness at various points as shown in the figure. Cylinder cover 0.10mm Air inlet branching pipe surface 0.10 mm Chery Automobile Co., Ltd...
- Page 22 Checks on the clearance between the throttle guiding Measure point pipe and throttle thrusting rod 1 Use a dial gauge to measure the inner diameter of the throttle guiding pipe, and use a caliper to measure the outer diameter. Chery Automobile Co., Ltd...
- Page 23 [Attention] In the process of driving in the guiding pipe into the cylinder cover, the operation should be carried out slowly until the pipe gets to the proper position. No excessive driving should be exerted. Pay attention to the specifications in the operation. Chery Automobile Co., Ltd...
- Page 24 If not, proper corrections have to be made. 3、Make conic cutting at the center of the mating position with 70 degrees toward inwards and 30 degrees outwards. Chery Automobile Co., Ltd...
- Page 25 2 Installation of IN and EX 3 Assembling of valve springs Mark Attention It is for you to distinguish the different suppliers by means of paintings on the valve spring,valve spring same engine should have same idenhtification paint marking. Chery Automobile Co., Ltd...
- Page 26 70±3.5 N.m. . ○ 1 Installation of the spark plug [Torque] 20±1Nm Attention: The tools should be placed vertically,so as not make spark plug insulator become deformed,otherwise it is easy to leak oil. Chery Automobile Co., Ltd...
- Page 27 2.Use a hand wrench to see if the turning is OK, and if it is smoothly lubricated? 5-5 Installation 1 Install the dustproof sealing stripes 2 Install the water pump principal body Tighten with a torque of 25±1.5N.m 2 Install the new O-shaped rings Chery Automobile Co., Ltd...
- Page 28 ② Oil strainer ③ Oil collector gaeket ④ Oil pump ⑤ Oil pump gasket ⑥ Rear oil seal bracket Non-reusable part 6-2 Dismounting 1 The engine being turned upside down on the dismounting frame,take off the bolts. Chery Automobile Co., Ltd...
- Page 29 [Attention] Do not make the oil pan flange section to be deformed. Remove the oil collecting filter and its flange [Attention] The filter flange is not reusable. Dismount the oil pump assembly and oil pump cushion Dismounting of oil seal stand Chery Automobile Co., Ltd...
- Page 30 2 Oil pump cover plate 3 Driven rotor 4 Drive rotor 5 Split pin 6 Relief valve spring seat 7 Relief valve spring 8 Relief valve ※： Non-reusable part 9 Crankshaft front oil sealing 10 Oil pump body Chery Automobile Co., Ltd...
- Page 31 5．Removal of the oil pump pressure relief valve spring pressure relief stand, spiral spring, oil pump pressure relief valve valve Spring seat 弹簧座 slider 卸压阀弹簧 滑块 6． Removal of the front oil seal of the crankshaft [Attention] The removed oil seals are not reusable. Chery Automobile Co., Ltd...
- Page 32 ·Use new oil seal.. Pressing ·The exposed part of the outer edge of the oil seal after Inside direction being pressed in should be less than 0.5mm. Oil sealing 油封露 出 out 5mm 5mm 以 下 Chery Automobile Co., Ltd...
- Page 33 4 The new weather seal should be put inside the oil pump cover groove. 6-5 Disintegratin and assembling of oil seal 6-5-1 Configuration diagram Non-reusable part Chery Automobile Co., Ltd...
- Page 34 [Grease] Letai 5699 [Attention] The liquid sealing silica is to be smeared to the mating sectin of the oil seal stands and cylinder body surface, with a width of 3—4mm. [Torque] 25±1.5N.m Chery Automobile Co., Ltd...
- Page 35 ·Make the assembly in 15 minutes after the application of silica front (3). Tighten in the sequence shown in the right Rear figure with the torque of 6±1N.m from the centre to front the two sides Chery Automobile Co., Ltd...
- Page 36 (4) Main bearing cover (5) Crankshaft (6) Crankshaft bush (7) Thrust washer (8) Cylinder block (9) No.1 compression ring Non-reusable part (10) No.2 compression ring (11) Oil ring (12) Piston (13) Connecting rod (14) Piston pin Chery Automobile Co., Ltd...
- Page 37 (5) Tighten bush cover according to regulated torque torque: 40±2N.m [Attention] Do not turn the crankshaft (6) Remove the bush cover, measure the maximum width of the spacing ruler [Benchmark]: 0.020-0.044 mm [Limit]: 0.07 mm Chery Automobile Co., Ltd...
- Page 38 (2) Use a caliper to measure the crankshaft axial protective clearance. If the axial clearance is above the limits, it sleeve is needed to replace the axial thrust washer or the crankshaft. [Benchmark]:0.02-0.22mm [Limit]:0.30mm Benchmark Item value Thickness of thrust +0.15 -0.25 face Chery Automobile Co., Ltd...
- Page 39 [Attention] Tighten the bolts of the crankshaft bearing cover in three times to the regulated value, in the sequence as shown in the right figure. Attention: Don’t turn crankshaft after tightening ,because of the clearance gauge. Chery Automobile Co., Ltd...
- Page 40 1. Use the old ring to clean the accumulated carbon in the ring groove. 2. Clean the accumulated carbon at various parts with detergents. [Attention] Do not use metal brush or some other hard sutstance to do the cleaning. Chery Automobile Co., Ltd...
- Page 41 (2) Use the inner diameter centi-meter to measure the positions of the piston hole diameter shown as the following figure, take the minimum value as the size of the pinhole diameter. Chery Automobile Co., Ltd...
- Page 42 Benchmark Limit (mm) (mm) Primary ring 0.25-0.40 0.65 Secondary 0.35~0.50 0.65 ring Oil ring 0.20~0.70 1.00 Chery Automobile Co., Ltd...
- Page 43 （1）Use a caliper to measure the shaft diameter , and work out the circularity and cylindricity. [Limit] 0.005mm (2)Use a caliper to measure the connecting rod diameter ,and work out the circularity and cylindricity. [Limit] 0.004mm the measuring position is shown as the figure, Chery Automobile Co., Ltd...
- Page 44 ： install the primary ring No.1 ring Open degree of every ring is shown as the illustration: No.2 ring Oil ring Ring open angle ： Down scrapeing 下刮片 No.1 ring No.2 ring Gasket Up Up scrapeing Chery Automobile Co., Ltd...
- Page 45 （5） Rotate the crankshaft after assembling, you should rotate it with ease,the torque should be less than 1Nm Attention:· The torque of crankshaft rotating should be less than 1Nm;(The torque is for installing the crankshaft only,not for installing the piston connecting rod) Chery Automobile Co., Ltd...
- Page 46 ② Tighten the left and right screw nuts alternately for a couple of times with the specified torque. [Torque]： 40±2N.m [Attention] The connecting rod and the rod bush should be bought from the same supplier. Chery Automobile Co., Ltd...
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how to achieve timing between intake and exhaust camshafts without marks