Mercedes M-Class W163

since 1997 of release

Repair and car operation



Mercedes W163
+ Mercedes-Benz Cars of a class M (W163)
+ Governing bodies and receptions of safe operation
+ Current leaving and service
+ Engine
+ Systems of cooling, heating and air conditioner
+ the Power supply system and production of the fulfilled gases
+ Systems of electric equipment of the engine
- Manual box of gear shifting
   Adjustment of a drive of switching of RKPP 717.461
   Removal and installation of the lever of switching of RKPP 717.461
   Features of a design of a shtokovo-trosovy drive of switching of RKPP 716.644
   Removal and installation of the lever of switching of RKPP 716.644
   Removal and RKPP installation
+ Avtomaticheckaya transmission
+ Transmission line
+ Brake and auxiliary systems
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
Тактические рюкзаки



Manual box of gear shifting

Specifications

Type and RKPP designation

Models 163.136 (ML 230) 6-step, 716.644 (SG-S370/6.1)
Models 163.113 (ML 270 of CDI) 5-step, 717.461 (GL_7b/29_B_5)
Type and volume of transmission oil See. Specifications to Head the Current leaving and service
Transfer relations

РКПП 716.644

  • 1st transfer
5.01
  • 2nd transfer
2.83
  • 3rd transfer
1.78
  • 4th transfer
1.25
  • 5th transfer
1.00
  • 6th transfer
0.82
  • Reverse gear
4.56
  • РКПП 717.461
Data are not provided
Efforts of a tightening of carving connections, Nanometer

РКПП 716.644

Bolts of fastening of RKPP to the engine 40
Drain stopper of the pallet of a case of RKPP 60
Stopper of a jellied opening 50
Nuts/bolts of fastening of a back cross-section beam of the power unit to a body 40
Nut/bolt of fastening of a back pillow of a support of a suspension bracket of the power unit to transmission 40
Самоконтрящиеся bolts of fastening of a forward camshaft to a target shaft of a transfer case 40
РКПП 717.461
Carving pin of a rod of switching 12
Bolts of fastening of RKPP to the engine
Bolts of fastening of transmission to the engine

М10x40

  • With a galvanic covering of yellow color
55
  • With a synthetic covering of Dacromet/chromeplated
40
М10x90
  • With a galvanic covering of yellow color
45
  • With a synthetic covering of Dacromet/chromeplated
40
Bolts of fastening of a casing of the adapter to RKPP case 20

At the expense of the energy allocated at combustion in cylinders of an air and fuel mix a cranked shaft of the engine the torque, thus frequency of its rotation develops lies within rather narrow range. The majority of modern engines of an OHV design develop the maximum torque at turns about 2500 in a minute. At increase in frequency of rotation of the engine the size of its torque decreases to 4500 rpm so that the further increase in capacity is not obviously possible any more. Engines with the top arrangement of a camshaft (OHC) are capable to develop considerably a bigger torque, however in much narrower range of frequencies of rotation.

Use in the transmission line of such component as the transmission allows to regulate relationship between turns of the engine and speed of rotation of driving wheels of the car, providing rather high efficiency of return of the power unit practically in any service conditions of the car.

Smoothness of transfer of a torque from a cranked shaft to primary shaft of a manual box of gear shifting (RKPP) is provided by coupling assembly, the design and which principle of action are disassembled in Head the Transmission line of the real Management. Consecutive gear shifting in the course of change of speed of movement of the car is provided at the expense of use in a transmission of a multistage reducer. The transfer relations of each of five/six steps of RKPP provide maximum efficiency of transfer of capacity developed by the engine to driving wheels of a vehicle at various speeds of movement.

On two of the all-wheel drive Mercedes-Benz models of the M-class considered in the real Management besides automatic transmissions (see. Head Avtomaticheckaya transmission) manual transmissions (RKPP) of one of two types can be used: 717.461 (ML 230) and 716.644 (ML 270 of CDI). Both boxes have the standard design used on the majority of Mercedes cars with a classical back drive (series 717.4 and 716.6).

Transformed RKPP developed by the engine in reducer a torque acts in film since the back end of the main shaft and is transferred to an entrance shaft of the transfer case which is carrying out its further distribution between forward and back by leading bridges of the car. Detailed information on a design and a principle of functioning of a transfer case is provided in Head the Transmission line of the real Management.

In both transmissions synchronization of all of five (717.4) / six (716.6) steps of switching of all forward transfers is provided.

It is meaningful to give a little attention to features of functioning of more modern six-step RKPP.

Boxes of a series 716.6 belong to the class completely synchronized 2-вальных of 6-step check points with one reverse gear, received wide application both on rear-wheel, and on the all-wheel drive cars equipped both with petrol, and diesel engines.

General view of RKPP 716.6

1 — Primary shaft of a check point
2 — the Synchronizing ring of 5/6 transfers
3 — the Shaft
4 — the Loose leaf of the bearing of a backing

5 — an inclusion Cam
6 — an inclusion Axis
7 — the Flange of connection with the driveshaft

RKPP 7.6.6 design

1 — the Entrance shaft
2 — the Main shaft
3 — the Intermediate shaft
4 — the Forward case
5 — the Back case
6 — Vyzhimnoye the coupling device
7 — Mnogokonusny the synchronizer of switching 1/2
8 — Mnogokonusny the synchronizer of switching 3/4
9 — the Gear wheel of the 1st transfer

10 — the Gear wheel of the 2nd transfer
11 — the Gear wheel of the 3rd transfer
12 — the Gear wheel of the 4th transfer
13 — the Gear wheel of the 5th transfer
14 — the Gear wheel of the 6th transfer
15 — the Gear wheel of a reverse gear
16 — the Central rod of switching
17 — the Module of internal switching
18 — the Intermediate gear wheel of a reverse gear

Competent use of the 6th transfer allows to achieve essential economy of fuel consumption at the expense of decrease in working turns of the engine. In view of design features 6-step transmissions have bigger weight, than 5-step.

The box perceives a torque from the engine by means of usual coupling of the dry type equipped with the automatic jack of wear. The case of RKPP has a tight design and refuels transmission oil not needing replacement.

Accuracy and ease of switchings having a short course is reached by the following features of a design:

  • Application of a shtokovo-trosovy drive of switching with the central rod fixed in needle bearings;
  • Use of mnogokonusny synchronizers of switchings of the 1st, 2nd, 3rd and 4th transfers;
  • Complete synchronization of a reverse gear.

Assemblies with shaft are located with Reduktornye between two bearing planes. The third bearing plane used in earlier 5-step boxes in this design is eliminated.

The two-section separate case is made of an easy alloy and pressurized by means of a special liquid compound.

The entrance shaft (1) is fixed in a flywheel by means of the directing bearing, and a transmission case - by means of the ball bearing with a profound flute. Main (2) and entrance (1) shaft are jointed among themselves in the general plane of a case of transmission and fixed by means of ball bearings with a profound flute (see in the same place).

The intermediate shaft (3) has the facilitated hollow design and is fixed in the roller coupling and the ball bearing with a profound flute.

In view of the minimum production admissions of semi-cases and gear wheels, and also at the expense of use of roller couplings, need for adjustment axial люфтов shaft disappears.

Movings of the lever of gear shifting are transferred through drafts to a box. Removal of RKPP can be carried out separately from the engine, need for removal arises at coupling service, and also in case of need carrying out regenerative repairs/replacements actually RKPP.

In view of complexity of a design of RKPP, absence on free sale of necessary replaceable internal components and need of use of the special equipment, originators of the real Management do not recommend to owners of cars to carry out major maintenance of a transmission by own forces. Box repair in the conditions of a workshop of car-care center is rather expensive operation, in a type of that, it is necessary to consider alternative options of replacement of the failed block new or restored. Any useful information on repair and replacement of transmission can be received at Mercedes-Benz company car repair shops. Regardless of the chosen way of elimination of problems (repair or replacement), independent dismantle of a box from the car will allow to reduce material inputs essentially.

In this Part of Head descriptions of processes of performance such, lying within qualification of the average amateur mechanic of procedures, as the general adjustment of a drive of gear shifting and removal/installation of assembly of RKPP are offered attention of the reader. Councils on switching management ми are stated to RKPP in Head Governing bodies and receptions of safe operation.

Information on automatic transmissions (AT) is presented in Head Avtomaticheckaya transmission.