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Valve gear

Drive verhneraspolozhennyh (SOHC and DOHC) camshafts is carried out single-row (motors M 102 and M 123) or double row (motors M 110 and M 115) chain.

Circuit voltage is regulated hydraulic tensioner with locking.

Cover camshaft drive of an aluminum alloy.

Timing

Calculation of the valve timing is a zero-gap estimated valves and valve lift of 2 mm.

In parentheses are the values after a run of 20000 km.

Option mm	Engine model
	M 115,938	M 102,920, 102,939 M	M 102,980, M 102.982	M 115,954
Starting opening of the intake valve before TDC of the intake stroke ahead	14.0	11.0 (12.0)	11.0 (12.0)	14.0
The closure of the intake valve after bottom dead center of the compression stroke with delay	20.0	17.0 (18.0)	17.0 (18.0)	27.0
Starting opening the exhaust valve before BDC stroke ahead	22.0	32.0 (31.0)	32.0 (31.0)	36.5
Closing the outlet valve after TDC exhaust stroke with delay	12.0	13.0 (12.0)	13.0 (12.0)	18.50
Marking camshaft	5	12	23	13
Option mm	M 123,920, 123,921 M	M 110,923	M 110,984, 110,988 M
Starting opening of the intake valve before TDC of the intake stroke ahead	15.0	7.0	7.0
The closure of the intake valve after bottom dead center of the compression stroke with delay	21.0	21.0	21.0
Starting opening the exhaust valve before BDC stroke ahead	21.0	30.0	30.0
Closing the outlet valve after TDC exhaust stroke with delay	11.0	12.0	12.0
Marking camshaft	02	right: 57 Left: 25	71 67

Camshafts

Five- (motors M 102 and M 115) or semioporny (motors M 110 and M 123), a hollow camshaft. The front end of the shaft is closed bolt sprocket and the rear - steel plug. The oil in the channel of the shaft passes through the groove and the hole back support and provides lubrication of the support shaft. At the end of the flange on the shaft sprocket stamped digital label.

Features camshafts

Pulling the supply chain can be compensated by moving the camshaft sprocket.

Characteristic	Value
Permissible radial runout necks of a camshaft, mm	0,025-0,030
Clean the surface of the support bearing of the camshaft, m	0,003

Offset camshaft sprocket, mm	Amendment
0.7	6 ?�
0.9	8
eleven	9,5 ?�
13	11,5 ?�

The gaps in the mechanism of the valve on the cold and hot engine intake and exhaust valves are shown in the table. On engines with hydraulic compensation of valve clearance valve clearances are not regulated.

Bearing supports are not heat treated. 1st pillar of the motor M 110 is not ground, set her sleeve.

Option mm	Engine model
	M 115,938	M 102,920, 102,939 M	M 102,980, M 102.982	M 115,954
On the cold engine
for intake valves	0.10	0.15	0.15	0.10
exhaust valves	0.20	0.20	0.20	0.20
On a warm engine (t ?� oil 45-75 ?� C)
for intake valves	0.15	0.30	0.30	0.15
Option mm	M 123,920, 123,921 M	M 110,923	M 110,984, 110,988 M
On the cold engine
for intake valves	0.10	0.10	0.10
exhaust valves	0.20	0.25	0.25
On a warm engine (t ?� oil 45-75 ?� C)
for intake valves	0.15	0.15	0.15

Features camshafts

Option mm	Engine model
	M 115,938	M 102,920, 102,939 M	M 102,980, M 102.982	M 115,954
Prop 1
The diameter of the shaft journal
nominal	34,959-34,975	31,934-31,950		34,959-34,975
1st oversize	34,859-34,875	*		34,859-34,875
2nd oversize	34,709-34,725	32,434-32,450		34,709-34,725
The diameter of the bearing hole
nominal	35,000-35,016	32,000-32,025		35,000-35,016
1st oversize	34,900-34,916	*		34,900-34,916
2nd oversize	34,750-34,766	32,500-32,525		34,750-34,766
Supports 2 and 3
The diameter of the shaft journal
nominal	48,959-48,975	-	-	48,959-48,975
1st oversize	48,859-48,875	-	-	48,859-48,875
2nd oversize	48,709-48,725	-	-	48,709-48,725
The diameter of the bearing hole
nominal	49,000-49,016	-	-	49,000-49,016
1st oversize	48,900-48,916	-	-	48,900-48,916
2nd oversize	48,750-48,766	-	-	48,750-48,766
Prop 4
The diameter of the shaft journal
nominal	-	-	-	-
1st oversize	-	-	-	-
2nd oversize	-	-	-	-
The diameter of the bearing hole
nominal	-	-	-	-
1st oversize	-	-	-	-
2nd oversize	-	-	-	-
Prop 5
The diameter of the shaft journal
nominal	-	-	-	-
1st oversize	-	-	-	-
2nd oversize	-	-	-	-
The diameter of the bearing hole
nominal	-	-	-	-
1st oversize	-	-	-	-
2nd oversize	-	-	-	-
Prop 6
The diameter of the shaft journal
nominal	-	-	-	-
1st oversize	-	-	-	-
2nd oversize	-	-	-	-
The diameter of the bearing hole
nominal	-	-	-	-
1st oversize	-	-	-	-
2nd oversize	-	-	-	-
Prop 7
The diameter of the shaft journal
nominal	-	-	-	-
1st oversize	-	-	-	-
2nd oversize	-	-	-	-
The diameter of the bearing hole
nominal	-	-	-	-
1st oversize	-	-	-	-
2nd oversize	-	-	-	-
Option mm	M 123,920, 123,921 M	M 110,923	M 110,984, 110,988 M
Prop 1
The diameter of the shaft journal
nominal	34,93-34,95	23,98-23,99
1st oversize	34,83-34,85	*
2nd oversize	34,68-34,70	*
The diameter of the bearing hole
nominal	35,00-35,02	38,00-38,02 *
1st oversize	34,90-34,92	*
2nd oversize	34,75-34,77	*
Supports 2 and 3
The diameter of the shaft journal
nominal	48,93-48,95	49,93-49,94
1st oversize	48,83-48,85	49,68-49,70
2nd oversize	48,68-48,70	49,43-49,45
The diameter of the bearing hole
nominal	49,00-49,02	50,05-50,07
1st oversize	48,90-48,92	49,80-49,82
2nd oversize	48,75-48,77	49,55-49,57
Prop 4
The diameter of the shaft journal
nominal	49,93-49,95	49,93-49,95
1st oversize	49,83-49,85	49,68-49,70
2nd oversize	49,69-49,70	49,43-49,45
The diameter of the bearing hole
nominal	50,00-50,02	50,00-50,02
1st oversize	49,90-49,92	49,75-49,77
2nd oversize	49,75-49,77	49,50-49,52
Prop 5
The diameter of the shaft journal
nominal	-	51,42-51,44
1st oversize	-	51,17-51,19
2nd oversize	-	50,92-50,94
The diameter of the bearing hole
nominal	-	51,50-51,52
1st oversize	-	51,25-51,27
2nd oversize	-	51,00-51,02
Prop 6
The diameter of the shaft journal
nominal	-	52,92-52,94
1st oversize	-	52,67-52,69
2nd oversize	-	52,47-52,49
The diameter of the bearing hole
nominal	-	53,00-53,02
1st oversize	-	52,75-52,77
2nd oversize	-	52,50-52,52
Prop 7
The diameter of the shaft journal
nominal	-	53,92-53,94
1st oversize	-	53,67-53,69
2nd oversize	-	53,43-53,45
The diameter of the bearing hole
nominal	-	54,00-54,02
1st oversize	-	53,75-53,77
2nd oversize	-	53,50-53,52

* 1st sleeve bearing has an outer diameter of 37,93-37,95 mm and an inner diameter of 24,00-24,01 mm.

The hydraulic tensioner

The piston pusher by the pressure of oil in the lubricating system of the engine and the interior of the spring constantly acts on the tensioner shoe.

Characteristic	Value
The diameter of the oil feed hole, mm	eleven
Maslovypusknogo diameter hole mm	12