4-dvigatel.html
4. Engine Specifications
|
Below the parameters used at performance of procedures described in the present Chapter are specified. Detailed standard data it is possible to receive HUNDRED Mercedes-Benzs at firm car repair shops. Separate characteristics are provided also in the text of Head and in case of obligation of their performance are allocated with a bold print. |
|
Below the values typical for all engines of considered series are listed only. |
Petrol models
General parameters
Engine type |
|
V-shaped, 6-cylinder, DOHC, with water cooling, a chain drive of GRM and microprocessor management |
|
V-shaped, 8-cylinder, DOHC, with water cooling, a chain drive of GRM and microprocessor management |
Model range of application |
|
112.945 |
|
113.962 |
|
113.982 |
Engine displacement, l |
М112 |
3.2 |
М113 |
|
|
5.0 |
|
5.5 |
Number of valves on the cylinder |
3 |
Extent of compression |
10.0:1 |
Pressure of a compression, atm |
|
12 ÷ 14 |
|
9.0 |
- The maximum admissible difference in indications between cylinders
|
1.5 |
Operating procedure of cylinders |
|
1-5-3-6-2-4 |
|
1-5-4-8-6-3-7-2 |
Klapannye gaps |
Automatic adjustment, - hydrojacks |
Head of cylinders
Molding
Classification of laying of heads of cylinders for engines
Obozna-
cheniye двига
tel
|
Volume цилинд
ditch, l
|
Diameter tsilind-
ditch (C), mm
|
Marking heads (А/В)
|
|
112.945
|
3.2
|
92.00
|
And
1120160320/0420
|
|
113.962
|
5.0
|
97.00
|
And
1130100220/0320
|
113.982
|
5.5
|
Data are absent
|
Data are absent
|
Data are absent
|
Sizes of bolts of fastening of a head of cylinders
Carving |
М11 |
Length (L), mm |
|
141.5 |
- Limiting admissible value
|
144.5 |
Directing plugs of valves
The scheme of landing of directing plugs of valves
Directing plugs of valves
Diameter of a nest under landing of the directing plug of the valve, mm |
|
12.500 ÷ 12.511 |
- Standard size I (dark blue)
|
12.520 ÷ 12.531 |
|
12.700 ÷ 12.711 |
|
13.100 ÷ 13.111 |
External diameter of the directing plug of the valve, mm |
|
12.540 ÷ 12.551 |
- Standard size I (dark blue)
|
12.560 ÷ 12.571 |
|
12.740 ÷ 12.751 |
|
13.140 ÷ 13.151 |
Length of the directing plug of the valve, mm |
|
50 |
Geometrical characteristics of the directing plug, mm
|
And 14.3 ± 0.2 |
Details of installation and geometrical parameters of klapanny saddles (engines of series 112 and 113)
Saddles of valves
|
Engines of series 112 and 113
|
Geometrical parameters of valves (see сопр. illustration)
|
D, mm
|
М112 |
|
36 ± 0.1 |
|
41 ± 0.1 |
М113 |
|
|
38 ± 0.1 |
|
43 ± 0.1 |
With (for the new valve), mm
|
|
1.2 |
|
1.6 |
And, mm
|
|
6.975 |
|
6.970 |
In, mm
|
М112 |
|
119.40 ± 0.2 |
|
122.25 ± 0.2 |
М113 |
|
119.10 ± 0.2 |
|
121.80 ± 0.2 |
Block of cylinders
Case
Diameter of cylinders, mm
|
М112
|
Standard size |
|
89.900 ÷ 89.915 |
|
89.950 ÷ 89.965 |
Repair size |
90.150 ÷ 90.165 |
М113
|
Standard size |
|
97.000 ÷ 97.015 |
|
97.050 ÷ 97.065 |
Repair size |
97.250 ÷ 97.265 |
Cranked shaft
The sizes of bolts of fastening of covers of shatunny bearings (see сопр. illustration)
|
Carving |
М8x1 |
Length, mm |
|
47 |
- Limiting admissible value
|
47.6 |
Designations of persistent half rings of a cranked shaft
Block cylinders
|
Pin of a cranked shaft
|
Persistent half rings
|
Size of the axial люфта shaft, mm
|
Obozn.
|
Inscription
|
Obozn.
|
Brands - rovka
|
Code
|
N
|
O
|
N
|
Warranty and digital code
|
0,10 ÷ 0,266
|
Code
|
N1
|
1
|
N1
|
Warranty and digital code
|
0,10 ÷ 0,266
|
Balancing shaft (series 112)
Limiting admissible length of a bolt of fastening of a counterbalance, mm |
50.7 |
Shatunno-porshnevye assemblies
Diameter of pistons, mm |
М112 |
Standard size |
|
89.872 ÷ 89.902 |
|
89.872 ÷ 89.902 |
Repair size |
90.122 ÷ 90.152 |
М113 |
Standard size |
|
96.972 ÷ 97.000 |
|
97.022 ÷ 97.050 |
Repair size |
97.222 ÷ 97.250 |
Maximum admissible size люфта pistons, mm |
0.043 |
Size radial люфта shatunny bearings (new bearings), mm |
0.026 ÷ 0.054 |
Axial люфт rods
Color marking of the loose leaf
|
Size of an axial rod, mm
|
Top loose leaves (rods)
|
Bottom loose leaves (covers)
|
The yellow
|
The yellow
|
0,026 ÷ 0,054
|
The dark blue
|
The red
|
0,026 ÷ 0,054
|
The red
|
The dark blue
|
0,026 ÷ 0,054
|
Sizes of piston rings, mm
|
Kompressionnye of a ring
|
М112 |
83.2x1.5x3.1 |
М113 |
|
|
97.0x1.2x3.5 |
|
97.0x1.5x3.1 |
Maslosjemnoye ring |
М112 |
83.2x3.5x3.5 |
М113 |
|
|
97.0x1.5x4.0 |
|
97.0x3.5x3.5 |
Efforts of a tightening of carving connections, Nanometer
Drain stopper of the pallet of a case of the engine (М14) |
30/32 |
Cover of a casing of the oil filter |
25 |
Self-cut bolt of fastening of a natyazhitel to a cover of a drive of GRM |
|
35 |
|
25 |
Bolts of fastening of a damper of a natyazhitel of a belt |
drive of auxiliary units |
|
25 |
|
35 |
Bolts of fastening of a natyazhitel |
25 |
Shtutserny knot of connection of a submitting gasoline pipe line to the fuel highway |
38 |
Flange connection of a reception pipe of system of production of the fulfilled gases with a final collector |
20 |
Bolts of fastening of a starter to an engine case |
42 |
Bolts of fastening of pillows of forward support to a stretcher |
35 |
Bolts М8 of fastening of the hydrotransformer to a driving disk |
42 |
Bolts of fastening of AT to the engine |
|
40 |
|
- |
Knots of fastening of hydraulic lines to the steering pump |
Pressure head line |
|
- |
|
45 |
Returnable line |
2 |
Screws of fastening of the To/in compressor to a basic arm |
20 |
Bolts of fastening of a cover of a drive of GRMK to the block and head of cylinders |
20 |
Bolt М8x78 of fastening of a directing pulley of a belt of a drive To/in and auxiliary агрегатовк to a cover of a drive of GRM |
68 |
Bolts of fastening of the water pump |
|
|
|
14 |
|
10 |
|
|
35 |
|
25 |
|
10 |
Fastening of a pulley of a drive of the water pump |
10 |
Bolts of fastening of a casing of the thermostat (М6) |
10 |
Bolts of fastening of the steering pump |
|
|
35 |
|
20 |
|
25 |
Bolts of fastening of the inlet pipeline to heads of cylinders (М8) |
20 |
Natyazhitel of a chain in a cover of a drive of GRM |
80 |
Bolt of fastening of asterisks of camshafts (М12x45) |
|
50 |
|
To hold on on a corner 90 ° |
The sensor of the Hall of a camshaft in a head of cylinders |
8 |
Bolts of fastening of bridges of bearings of camshafts to головкамxилиндров |
|
|
|
15 |
|
- |
|
|
|
10 |
|
To hold on on a corner 90 ° |
Bolts of fastening of asterisks of camshafts (М12x45) |
|
50 |
|
To hold on on a corner 90 ° |
Bolts of fastening of a head of cylinders |
- To the engine block (internal TORX)
|
|
10 |
|
30 |
|
To hold on on a corner 90 ° |
|
To hold on on a corner 90 ° |
- To a cover of a drive of GRM
|
20 |
Bolts of fastening of covers of heads of cylinders |
10 |
Nut of fastening of a connecting tube to the EGR valve |
40 |
Flange connection of a reception pipe of system of production of the fulfilled gases with a final collector |
20 |
Nuts of fastening of a final collector |
16 |
Bolts of fastening of a face cover of the engine |
10 |
Central bolt of fastening of a damper of krutilny fluctuations |
|
200 |
|
To hold on on a corner 95 ° |
Bolts of fastening of a driving disk to a cranked shaft |
|
45 |
|
To hold on on a corner 90 ° |
Bolts of fastening of covers of radical bearings |
|
|
|
|
20 |
|
To hold on on a corner 90 ° |
|
30 |
|
|
|
30 |
|
To hold on on a corner 90 ° |
Bolts of fastening of covers of the bottom heads of rods |
|
5 |
|
25 |
|
To hold on on a corner 90 ° |
Bolt М7x16.5 of fastening of a lock plate to a balancing shaft (М112) |
15 |
Bolt of fastening of a counterbalance to a balancing shaft (М112) |
|
20 |
|
To hold on on a corner 90 ° |
Bolts/nut of fastening of a pillow of a back support of a suspension bracket of the power unit |
|
35 |
|
35 |
Nuts of fastening of a cross-section beam to a car frame |
35 |
Bolts of fastening of the left and right lateral support of a suspension bracket of the power unit to an engine case |
|
20 |
|
To hold on on a corner 90 ° |
Bolts of fastening of pillows of forward support of a suspension bracket of the power unit |
|
35 |
|
65 |
Cover of a casing of the oil filter |
25 |
Bolts of fastening of a casing of assembly of the oil filter |
70 |
Fastening of the liquid heat exchanger of the oil filter |
11 |
Drain stopper of the pallet of a case (М14) |
30 |
Self-cut bolts of fastening of the bottom section of the pallet of a case to the top |
|
14 |
|
10 |
Bolts of fastening of the top section of the pallet of a case to the block of cylinders |
|
9 |
|
20 |
Bolts of fastening of the sensor of level of oil |
to the top section of the pallet of a case |
10 |
Bolts of fastening of masloraspylitel |
15 |
Bolts of fastening of the oil pump (М8x30) |
20 |
Diesel models
|
Below the values typical for all engines of considered series are listed only. |
General parameters
Engine type |
|
Ryadny (R), 5-cylinder, DOHC, turbirovanny, with water cooling, a chain drive of GRM |
|
V-shaped, 8-cylinder, DOHC, turbirovanny, with water cooling, a chain drive of GRM |
Model range of application |
|
612.965 |
|
628.962 |
Engine displacement, l |
|
2.7 |
|
4.0 |
Number of valves on the cylinder |
4 |
Pressure of a compression, atm |
|
29 ÷ 35 |
- Minimum admissible value (approximately)
|
18 |
The maximum admissible difference in indications between cylinders |
3.0 |
Operating procedure of cylinders |
|
1-2-4-5-3 |
|
1-5-4-8-6-3-7-2 |
Klapannye gaps |
Are not regulated, since hydrojacks are applied |
Head of cylinders
М612
Molding
Sizes of bolts of fastening of a head of cylinders
Carving |
М12 |
Length, mm |
- Except М612.990
|
|
102 |
- Limiting admissible value
|
104 |
- М612.990
|
|
107 |
- Limiting admissible value
|
- |
Details of installation of valves in a head of cylinders (series 612 engines)
Full height of a head of cylinders, mm |
Nominal rate |
126.85 ÷ 127.15 |
Limiting admissible value |
- |
Saddles of valves
Boring of saddles of valves (series 612 engines)
Geometrical characteristics of a saddle of the valve |
All valves |
|
45 ° (-30') |
|
1.0 ÷ 1.5 |
|
30 ° (± 15') |
|
0.9 ÷ 1.1 |
Maximum admissible ovality, mm |
0.03 |
Valves
Diameter of a plate (D), mm |
|
30.1 ÷ 30.3 |
|
28.3 ÷ 28.5 |
Height of a cylindrical part (corbel) of a plate (h), mm |
|
1.7 ÷ 1.9 |
Tilt angle of a working facet (a) |
|
45 ° (+15') |
Diameter of a core (D1), mm |
|
6.960 ÷ 6.975 |
|
6.955 ÷ 6.970 |
Superficial reinforcing of a saddle |
|
No |
Sodium filling |
|
No |
Length of the valve (L), mm |
|
104.7 ÷ 104.9 |
|
104.5 ÷ 104.9 |
Identification marking of a plate |
|
Е 611 01 |
|
And 611 01 05 |
Distance from an end face of a core of the valve to the basis of the bearing of a camshaft (T), mm |
|
17.1 ÷ 17.9 |
Landing of the new valve at a new saddle (and), mm |
|
1.1 ÷ 1.5 |
|
1.0 ÷ 1.4 |
Series 628
Molding
Sizes of bolts of fastening of a head of cylinders
Carving |
М12 |
Length, mm |
|
201.5 |
- Limiting admissible value
|
203 |
Block of cylinders
Series 612
Flywheel
Limiting size of cross-section palpation of a gear wreath, mm |
0.4 |
Diameter of the aligning plug of a gear wreath, mm |
276.05 (± 0.05) |
Case
Diameter of beds of radical bearings, mm |
62.500 ÷ 62.519 |
Width of a bed of the persistent bearing, mm |
19.979 ÷ 20.000 |
Limiting admissible size of an ovality / konusnost of beds of radical bearings, mm |
0.02 |
Cranked shaft
Sizes of bolts of fastening of covers of radical bearings |
Carving |
М11 |
Length (L), mm |
|
61.8 ÷ 62.2 |
- Limiting admissible value
|
63.8 |
Sizes люфтов a cranked shaft in radical bearings, mm |
- Radial люфт
|
|
0.03 ÷ 0.05 |
- Limiting admissible value
|
0.08 |
- Axial люфт
|
|
0.10 ÷ 0.25 |
- Limiting admissible value
|
0.3 |
Loose leaves of radical bearings
Thickness of loose leaves of radical bearings (the top and bottom loose leaves), mm |
Standard size (Ø 58.00 mm) |
- Dark blue marking (code 52)
|
2.255 ÷ 2.260 |
|
2.260 ÷ 2.265 |
|
2.265 ÷ 2.270 |
|
2.270 ÷ 2.275 |
|
2.275 ÷ 2.280 |
Shatunno-porshnevye assemblies
Size of a vystupaniye of the piston (and) in a new case, mm |
0.38 ÷ 0.62 |
Size lateral люфта piston rings, mm |
|
0.12 ÷ 0.16 |
|
0.05 ÷ 0.09 |
|
0.03 ÷ 0.07 |
Size of gaps in locks of piston rings, mm |
|
0.22 ÷ 0.42 |
|
0.20 ÷ 0.40 |
|
0.20 ÷ 0.40 |
Bolts of fastening of the bottom heads of rods |
- Diameter of a carving part
|
8x1 |
- Length (L) (see сопр. illustration), mm
|
|
47 ± 0.3 |
- Limiting admissible value
|
48 |
Sizes of rods |
Distance between centers the shatunny bearing and an opening under landing of a piston finger (L), mm |
148.970 ÷ 149.030 |
Width of heads of a rod (In and b), mm |
21.940 ÷ 22.000 |
Internal diameter of the bottom head of a rod (D1), mm |
51.600 ÷ 51.614 |
Limiting admissible sizes of ovality and konusnost of a bed of a shatunnogopodshipnik, mm |
0.02 |
Limiting admissible size of twisting of a rod at length more than 100 mm |
0.100 |
Limiting admissible size of violation of coaxiality of heads of a rod, mm |
0.045 |
Internal diameter of the plug top головкишатуна (d), mm |
30.018 ÷ 30.024 |
Base diameter of the plug of the top head of a rod (d1), mm |
32.500 ÷ 32.525 |
Size люфта landings of a porshnevogopalets in a rod, mm |
0.018 ÷ 0.024 |
Limiting admissible difference of scales of shatunny assemblies, g |
2 |
Series 628
Case
Diameter of beds of radical bearings, mm |
Base value |
74.500 ÷ 74.519 |
- Code 52 (first stage, dark blue)
|
74.500 ÷ 74.506 |
- Code 54 (second stage, yellow)
|
74.506 ÷ 74.512 |
- Code 52 (third stage, red)
|
74.512 ÷ 74.519 |
Width of a bed of the persistent bearing, mm |
25.29 ÷ 25.50 |
Limiting admissible size of ovality / конусности beds of radical bearings, mm |
0.02 |
Cranked shaft
Sizes of bolts of fastening of the bottom section of a case (bridge of covers of radical bearings) |
Carving |
М11 |
Length (L), mm |
|
|
113 |
- Limiting admissible value
|
115 |
|
|
135 |
- Limiting admissible value
|
137 |
Sizes люфтов a cranked shaft in radical bearings, mm |
|
|
0.03 ÷ 0.05 |
- Limiting admissible value
|
0.08 |
|
|
0.10 ÷ 0.25 |
- Limiting admissible value
|
0.3 |
Loose leaves of radical bearings
Thickness of loose leaves of radical bearings (the top and bottom loose leaves), mm |
Standard size (Ø 70.00 mm) |
- Dark blue marking (code 52)
|
2.252 ÷ 2.257 |
|
2.257 ÷ 2.262 |
|
2.262 ÷ 2.267 |
|
2.267 ÷ 2.272 |
|
2.272 ÷ 2.277 |
Shatunno-porshnevye assemblies
Bolts of fastening of the bottom heads of rods |
Carving |
8x1 |
Length (L) (see сопр. illustration), mm |
|
47 |
- Limiting admissible value
|
48 |
Size lateral люфта piston rings, mm |
|
0.12 ÷ 0.16 |
|
0.065 ÷ 0.110 |
|
0.03 ÷ 0.07 |
Size of gaps in locks of piston rings, mm |
|
0.40 ÷ 0.55 |
|
0.25 ÷ 0.50 |
|
0.20 ÷ 0.40 |
Efforts of a tightening of carving connections, Nanometer
All engines
|
Cover of a casing of the oil filter |
25 |
Bolt of fastening of the fuel filter to the air distributor |
|
14 |
|
9 |
Screw of a coupling collar of fastening of the fuel filter (М612) |
9 |
Series 612
|
Screws of fastening of the finishing panel of a cover of a head of cylinders |
10 |
Screws of fastening of the finishing panel of the air distributor |
10 |
Bolts of a basic arm of a sleeve of distribution of air of pressurization |
20 |
Knots of fastening of the pressure head line of the steering pump |
|
- |
|
45 |
Hollow bolt of shtutserny connection of the maslootvodyashchy line to a radiator |
30 |
Bolts of fastening of the To/in compressor to a cover of a drive of GRM |
20 |
Fastening bolts to the AT engine |
|
40 |
|
- |
Bolts of fastening of a forward cover of a head of cylinders |
14 |
Bolts of fastening of a head of cylinders to a cover of a drive of GRM (М8) |
20 |
Bolts of fastening of a cover of a drive of GRM to an engine case |
|
- |
|
20 |
Bolts of fastening of the pallet of a case |
|
|
9 |
|
20 |
|
- |
- To a cover of a drive of GRM (М6)
|
9 |
|
9 |
Drain stopper of the pallet of a case (М14) |
30 |
Central bolt of a damper of krutilny fluctuations |
|
|
200 |
|
To hold on on a corner 90 ° |
|
|
325 |
|
To hold on on a corner 90 ° |
Bolts of fastening of the To/in compressor to a cover of a drive of GRM |
20 |
Bolts of fastening of covers of bearings of camshafts to a head of cylinders |
9 |
Bolt of fastening of an asterisk of a final camshaft |
18 |
Bolt of fastening of an intermediate asterisk of TNVD |
40 |
Bolt of fastening of a natyazhitel of a gas-distributing chain to a cover of a drive of GRM |
80 |
Bolts of fastening of a head of cylinders |
|
20 |
|
|
|
60 |
|
To hold on on a corner 90 ° |
|
To hold on on a corner 90 ° |
TNVD pressure head line nut / fuel distributive highway |
20 |
Knot of connection of the forward catalytic converter to a turbokompressor |
30 |
Bolt of fastening of the line of removal of oil of a turbokompressor |
9 |
Bolts of fastening of a basic arm to a turbokompressor |
30 |
Bolts of a distributive sleeve of a path of pressurization of air |
|
- |
|
16 |
Collars of an air path |
3 |
Bolt of fastening of a basic arm to a distributive sleeve of a path of pressurization of air |
20 |
Bolt of fastening of a basic arm to an assembly bracket of the engine |
40 |
Bolts of fastening of the electromotor of shutdown of inlet port to a sleeve of distribution of air of a path of pressurization |
9 |
Nuts of fastening of a final collector on a head of cylinders |
30 |
Bolts of fastening of a back face cover of the engine |
9 |
Bolts of fastening of a flywheel / a driving disk to a cranked shaft |
|
45 |
|
To hold on on a corner 90 ° |
Cover of a casing of the oil filter |
25 |
Fastening of the liquid heat exchanger of the oil filter |
15 |
Bolts of fastening of the pallet of a case |
|
|
9 |
|
20 |
|
- |
|
40 |
- To a cover of a drive of GRM (М6)
|
9 |
Bolts of fastening of the sensor of level of oil to the case pallet |
14 |
Bolts of fastening of the oil pump |
18 |
Bolts of fastening of covers of the bottom heads of rods (shatunny bearings) |
|
5 |
|
25 |
|
To hold on on a corner 90 ° |
Bolts of fastening of covers of radical bearings of a cranked shaft (М11) |
|
55 |
|
To hold on on a corner 90 ° |
Series 628
|
Natyazhitel of a drive belt вспомогательныхагрегатов in an engine case |
30 |
Knot of connection of the forward catalytic converter to a turbokompressor |
15 |
Bolts of fastening of the hydrotransformer to a driving disk (М8) |
42 |
Cap nuts / hollow bolts of shtutserny lines of a path of cooling of ATF |
35 |
Knots of fastening of the pressure head line of the steering pump |
|
- |
|
45 |
Hollow bolt of shtutserny connection of the maslootvodyashchy line to a radiator |
30 |
Bolt of fastening of the refrigerator line to the To/in compressor |
20 |
Fastening bolts to the AT engine |
|
40 |
|
- |
Bolts of fastening of a forward cover of a head of cylinders |
14 |
Pins of riveted links of a gas-distributing chain (rough value) |
28 |
Bolts of fastening of covers of bearings of camshafts to a head of cylinders |
9 |
Bolt of fastening of an asterisk of a final camshaft |
18 |
Bolt of fastening of an intermediate asterisk of TNVD |
40 |
Bolt of fastening of a natyazhitel of a gas-distributing chain to a cover of a drive of GRM |
80 |
Bolts of fastening of a cover of a centrifuge to an engine case |
8 |
Bolts of fastening of heads of cylinders |
- To a cover of a drive of GRM (М8)
|
20 |
|
|
20 |
|
60 |
|
To hold on on a corner 90 ° |
|
To hold on on a corner 90 ° |
|
To hold on on a corner 90 ° |
Bolt of fastening of the line of removal of oil to a turbokompressor |
9 |
Bolts of fastening of a basic arm to a turbokompressor |
30 |
Nuts of fastening of a final collector on a head of cylinders |
30 |
Bolts of fastening of a back face cover of the engine |
9 |
Drain stopper of the pallet of a case (М14) |
32 |
Bolts of fastening of the pallet of a case |
|
|
19 |
|
20 |
|
- |
|
40 |
- To a cover of a drive of GRM (М6)
|
9 |
Bolts of fastening of the top section of the pallet of a case to the block of the engine (М6) |
8 |
Central bolt of a damper of krutilny fluctuations |
|
275 |
|
To hold on on a corner 90 ° |
Bolts of fastening of a 2-section flywheel / a driving disk to a cranked shaft |
|
45 |
|
To hold on on a corner 90 ° |
Cover of a casing of the oil filter |
25 |
Fastening of the liquid heat exchanger of the oil filter |
15 |
Fastening of the ventilating line to the left inlet pipeline |
11 |
Self-cut bolts of fastening of the bottom section of the pallet of a case to the top |
|
12 |
|
8 |
Bolts of fastening of the oil pump (TORX) |
8 |
Fastening screws to assembly of the oil pump of a cover with an oil tube |
10 |
Nut of fastening of a forward support to an arm |
110 |
Bolts of fastening of covers of the bottom heads of rods (shatunny bearings) |
|
5 |
|
25 |
|
To hold on on a corner 90 ° |
Bolts of fastening of the bottom section of a case |
|
8.5 |
|
20 |
|
|
20 |
|
50 |
|
To hold on on a corner 90 ° |
|
To hold on on a corner 90 ° |
|
|