Adjusting Throttle And Control Pressure Cable

Note

The positioning of the throttle to the valves in the transmission is extremely important for perfect transmission operation and unimpaired driving of car.

Basic Setting

1. Install cable sleeve on transmission bracket at distance "A" = 29 mm and tighten to torque of 20 Nm.

2. Screw on plastic socket for transmission lever completely and secure on transmission lever with securing clip.

3. Set accelerator pedal and cam to neutral position

4. Make sure short cable sleeve fits correctly in firewall.

Printed in Germany-XVI,1987 Adjusting Throttle and Control 37 - 11

Pressure Cable (Types 087 M and 087 N)

5. Up to Mod. '85 adjust short cable sleeve on firewall to dimension "B" = 8 mm

From Mod. '85/2, adjust short cable sleeve on holder to shortest length.

6. Place cable around cam plate in correct position and secure short cable sleeve on holder with circlip. From Mod. 85/2, cable sleeve screwed onto holder.

7. Install long cable sleeve on holder without tension (don't pull tight).

8. Adjust short cable sleeve until clamping nipple of cable can be placed in opening of cam plate without tension. Tighten nut for cable sleeve adjustmnet to torque of 5 Nm.

Note

It is very essential that the control pressure (accelerator side) cable be without tension, since the throttle switch (idle contact) will already be operated in a 1° throttle range.

37 - 12 Adjusting Throttle and Control Pressure Cable (Types 087 M and 087 N)

9. Adjust long cable sleeve on holder in the area of the cam until a prestress of 2...3 mm is achieved on control pressure cable.

10. If cable has been adjusted correctly, cam and accelerator pedal will be in neutral position and transmission operating lever will be in prestress position (2).

1 = Basic position

2 = Prestress position

3 = Full throttle position

4 = Kickdown start

5 = Kickdown end

Full Throttle Test

Press down on accelerator pedal to first noticeable pressure point (full throttle point) and check, whether throttle is wide open.

In this position, the dog in the cam plate's slot will not yet have lifted off.

Operating lever on transmission will be 10 mm away from final stop (dimension "B").

Kickdown Test

1. Depress accelerator pedal past full throttle up to kickdown point. In this position, check whether dog in cam plate's slot has lifted (against stop).

Printed in Germany - XVI,1987 Adjusting Throttle and Control 37 - 12 a

Pressure Cable (Types 087 M and 087 N)

2. Adjust stop bolt for accelerator pedal in this position (kickdown) so that bolt touches the .accelerator pedal. Then unscrew bolt one half turn.

Note

If lever is more than 2.5 mm away from final stop, the long cable sleeve on the holder must be readjusted in the area of the cam plate.

3. In kickdown position, the operator lever on the transmission must be 0...2.5 mm away from final stop (dimension "A").

37 - 12 b Adjusting Throttle and Control Pressure Cable (Types 087 M and 087 N)

Checking Function

The cause of damage or defect can be pinpointed with help of the troubleshooting card (page 37-17) and the following tests before repairing an automatic transmission.

B — Automatic Transmission and Final Drive Oil

Level Test C - Stall Speed Test D - Road Test E — Pressure Test

Important!

All jobs, which require the engine to be running, should only be performed with the selector lever in "N" or "P" and the parking brake applied.

Exceptions: tests, which require a different selector lever position briefly.

Checking ATF Level in

Automatic Transmission

1. Car must be parked on level floor or ground.

2. Selector lever in "N" and parking brake applied.

3. Engine running at idle speed during test.

5. ATF level between both marks of supply tank. Difference between upper and lower marks is approx. 0.4 liter/US qt.

6. Clean upper section of tank as well as cover prior to filling with ATF to avoid dirt in the supply tank.

Important!

The following procedures must be carried out prior to each transmission test and, if any faults are discovered, they must be eliminated before continuing work on the transmission.

Oil level can be higher or lower depending on temperature (heat expansion of ATF). Consequently an accurate check can only be made in the specified temperature range.

Do not add too much ATF, since an excessive amount would impair automatic transmission operation.

1. Check engine tuning (ignition timing, idle speed and transition).

Contaminated oil could impair transmission control.

2. Check for external damage, e. g. leaks on transmission (ATF) or final drive (hypoid oil) and missing or loose mounting bolts.

Important!

B—Automatic Transmission and Final Drive Oil Level Test

The specified oil level is extremely important for perfect operation of an automatic transmission, and therefore it is important to carry out the following test conscientiously.

Only fill automatic transmission with ATF Dexron.

ATFs of different makes with the designation "Dexron" may be mixed with each other.

Checking Final Drive Oil Level

Engine speed faster than stall speed:

Forward clutch slips.

1st gear one-way clutch slips.

1. Oil level should reach edge of oil filler plug. An excessively high oil level indicates an oil leak between the automatic transmission and final Stall speed not reached:

drive.

In this case the governor drive seal could be defective.

— about 200 rpm less than specified value

Poor engine power (ignition, fuel injection, compression)

— about 400 rpm less than specified value

One-way clutch in torque converter defective

C - Stall Speed Test

This test provides information on operation of the torque converter, plate clutches and brakes as well as one-way clutch for 1st gear.

Stall speed will be reduced by about 125 rpm for each 1,000 meters (3,300 ft) above sea level.

Note:

Important!

The stall speed could also drop slightly with high outside temperatures.

The stall speed test must be carried out with the engine and transmission at operating temperature and must not last longer than the time required to read the tachometer (max. 5 seconds) to avoid damage from excessive heat.

1. Connect tachometer on engine. Start engine and hold car by applying service and parking brakes. Move selector lever to "D" and press down briefly on accelerator pedal to full throttle. The engine will adjust to a certain speed, the so-called stall speed.

Stall Speed: 2800 ± 200 rpm

The following points could be causing deviations in stall speed.

D-Road test

Road test car (only when there is no obvious transmission damage). It is important to drive the car in as many driving conditions as possible, and in all the driving ranges of the automatic transmission. Careful observation is a must. Pay particular attention to shifting points for upshifts and downshifts, as well as the kickdown shift points with reference to speed and gear transitions.

Shift points in KM/H 944/924 S

Transmission Version

Shifts

Full Throttle*

Kickdown*

Transmission type 087 M

Code letter RH

+1 -1

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