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transmission for Sonstige-Citroen Dyane

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Gearbox in the exchange. Suitable for Citroen 2CV6 for disc brake. 250 euros Old part deposit

t. Note: It is not oil on the gearbox, please fill it up! (Article number 20000)

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Oil drain screw magnetically, suitable for Citroen 2CV, HY, DS, 11CV (with oil pan out of sheet

metal). Interior square. The suitable tool has our number 20221. Or. No. A1321M, thread M16x1,5x20

Oil drain screw (engine + gearbox) suitable for Citroen 2CV, DS, HY, GS. Thread M16.

2CV6, speedometer pinion in gearbox. 16 theeth! The pinion has an outside diameter of 20,7mm, the

shank has a diameter of 8mm.

Motor-gearbox screw connection: Short stud bolts (these are the lower stud bolts) between the motor

and gearbox. Suitable for Citroën 2CV6 + 2CV4, Dyanne AMI8, Mehari

Motor-gearbox screw connection: long stud bolts (these are the upper stud bolts, as they also hold

the air filter holder) between the motor and gearbox. Suitable for Citroën 2CV6 + 2CV4, Dyane, AK, Ami8

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Citroën Dyane Transmission: Differences, Gear Ratios, and Important Notes

The transmission in the Citroën Dyane is closely related to those in the Citroën A-series models. These include the 2CV, Dyane, Ami, Méhari, Acadiane, and various van variants. Although many components appear similar at first glance and are partially interchangeable, there are important differences in gear ratios, braking systems, clutches, speedometer cable drives, and model years.

Accurate identification is particularly important for the Dyane, as there were various engine options and configurations. A Dyane 4 with a 435 cm³ engine is technically classified differently than a Dyane 6 with a 602 cm³ engine. Gearboxes from the 2CV6, Ami 8, or Acadiane may also appear mechanically similar, but they are not necessarily compatible with the respective Dyane model.

The Citroën Dyane’s transmission is a 4-speed with reverse. As with many Citroën A-series models, 2nd, 3rd, and 4th gears are synchronized. First gear, however, is not synchronized.

In practice, this means: First gear should only be engaged when the vehicle is stationary. If first gear is engaged while driving or coasting, significant shifting noises may occur. This is not necessarily a defect, but rather a design feature of this generation of transmissions.

If 1st gear is difficult to engage while the vehicle is stationary, a simple procedure often helps: first shift briefly into 2nd gear and then shift into 1st gear. This allows the gears to align better.

Citroën Dyane 4 and Dyane 6: Correctly Matching the Transmission

For the Citroën Dyane, the engine type is crucial for determining the correct transmission.

The Dyane 4 is equipped with the smaller 435-cc engine. The Dyane 6 has the more powerful 602-cc engine. These differences in engine power also result in different requirements for gear ratios and driving behavior.

A transmission with too long a gear ratio can lead to sluggish handling with a weaker engine. A transmission with too short a gear ratio can result in higher RPMs at higher speeds. Therefore, the transmission should always be selected to match the engine, year of manufacture, and intended use.

Model Engine Transmission Character
Dyane 4 435 cm³ relies more on appropriate power delivery with a smaller engine
Dyane 6 602 cc can make better use of a longer gear ratio
Acadiane 602 cc Often designed for commercial vehicles, tuned differently depending on the model
Ami 8 602 cc often with longer gear ratios, more comfort-oriented character
2CV6 602 cc mostly shorter gear ratios, good low-end torque

Citroën Dyane Gear ratio: 8/31 or 8/33?

An important difference between the transmissions of the A-models lies in the final drive ratio. The ratios 8/31 and 8/33 are frequently mentioned.

For many 2CV6 transmissions, the 8/33 ratio is typical. This is considered rather short and provides good low-end torque. In contrast, the Dyane 6, Ami 8, and Acadiane often feature longer ratios such as 8/31. These can make the vehicle feel smoother at higher speeds but also require slightly more engine power.

Transmission / Model Type Typical gear ratio Character Effect in practice
2CV6 often 8/33 rather short Good acceleration, higher RPM
Dyane 6 often 8/31 or model-dependent tends to be longer smoother at speed, less responsive on hills
Ami 8 often 8/31 longer more pleasant touring character
Acadiane frequently 8/31, depending on the model depending on usage Suitable for heavy loads and longer body
Dyane 4 depending on the model Tuned for smaller engines should not have too long a gear ratio

For a Dyane 6, a longer transmission can be desirable if the vehicle is frequently driven on country roads or at a constant speed. However, on mountainous routes, when carrying a load, or when towing, a shorter gear ratio may be more advantageous.

Important: A transmission should not be judged solely on whether it fits mechanically. The decisive factor is whether the gear ratio, brake system, clutch, and drive shafts are compatible with the specific Dyane.

Citroën Dyane transmission with drum brakes or disc brakes

The braking system is a particularly important consideration. For the Citroën A-series models, there are transmission variants designed for internal drum brakes and for internal disc brakes.

With the Dyane, too, you must check which brake system is installed. This determines which transmission is technically compatible and which brake fluid may be used.

Drum brake transmission on the Citroën Dyane

Earlier versions of the Dyane have internal front drum brakes on the transmission. These vehicles use classic DOT- or Lockheed-based brake fluid.

Typical features:

Feature Drum brake transmission
Front wheel brake Internal drums on the transmission
Brake fluid DOT / Lockheed
Handbrake acts on the front drums
Transmission housing without mounting for disc brake calipers
Conversion to disc only practical with further modifications

On a Dyane with a drum brake system, a disc brake gearbox should not be installed without first inspecting and modifying the entire brake system accordingly.

Disc brake gearbox on the Citroën Dyane

Later Dyane models may be equipped with internal disc brakes. These vehicles use LHM, i.e., green mineral hydraulic fluid.

Typical features:

Feature Disc brake mechanism
Front wheel brake Internal brake discs on the transmission
Brake fluid LHM, green, mineral-based
Handbrake Separate handbrake pads on the disc brake
Transmission housing with mounting for brake calipers
Hoses and seals must be suitable for hydraulic brake fluid

Important: Hydraulic brake fluid (LHM) and DOT/Lockheed brake fluid must never be mixed. The seals, boots, and components are designed for different fluids. Mixing them can cause serious damage to the brake system.

Can a 2CV6 transmission be installed in a Dyane?

In many cases, a 2CV6 transmission may function similarly or even be installable mechanically. Nevertheless, it is not automatically the right choice for a Dyane.

The following points must be checked before installation:

Checkpoint Meaning
Gear ratio affects torque, RPM, and top speed
Brake system Drum or disc must fit
Brake fluid Do not mix DOT/Lockheed or LHM
Clutch Note the model and year of manufacture
Drive shafts Check flanges and model
Speed sensor shaft drive May vary depending on the transmission
Handbrake Drum and disc brakes differ
Engine The Dyane 4 and Dyane 6 require different tuning

A 2CV6 transmission with a short gear ratio can provide good low-end torque in a Dyane 6. At the same time, engine RPM may increase at higher speeds. A longer Dyane, Ami, or Acadiane transmission may run more smoothly but feels less powerful on inclines or when loaded.

Can an Ami or Acadiane transmission fit in a Dyane?

Transmissions from the Ami 8 or Acadiane are technically related to the Dyane. Nevertheless, there are differences here as well. The gear ratio and the design for the respective vehicle type are particularly important.

An Ami 8 transmission often has longer gear ratios and is designed for smoother driving. An Acadiane transmission may be tuned differently due to its commercial vehicle character. This can noticeably change the driving behavior in a Dyane.

Before installation, you should therefore always check whether the transmission is suitable for the intended use. For an original or as close-to-production-spec Dyane as possible, not every technically compatible transmission is the best choice.

Citroën Dyane Reverse Gear and Typical Transmission Problems

Reverse gear in the Dyane: only for short, slow maneuvers

A particularly important note concerns reverse gear. As with other Citroën A-series models, the Dyane’s reverse gear is intended for short maneuvering movements. Longer periods of reverse driving, high RPMs, or heavy loads should be avoided.

It is known that these transmissions can seize up after prolonged or forceful reverse driving. The cause usually lies not directly with the reverse gear itself, but with a component in the area of the sliding sleeve for 2nd and 3rd gears.

There is a retaining or threaded bushing located there. If this bushing loosens, the sliding body can shift too far. This can cause shifting components in the transmission to jam. The transmission then behaves as if two gears were engaged simultaneously.

Drive in reverse only slowly, for short distances, and without heavy loads.

This applies especially to long driveway approaches, garage entrances, inclines, grassy areas, gravel surfaces, or when maneuvering with a heavy load.

Why can the Dyane transmission lock up after driving in reverse?

When driving in reverse, different forces act on the transmission than during normal forward driving. If you drive in reverse for a long time, with the throttle wide open, or under heavy load, unfavorable stresses are placed on the shift mechanism.

If a retaining pin is already weakened or no longer properly secured, the bushing can come loose. As a result, the sliding sleeve can shift out of its intended position. In the worst-case scenario, the transmission locks up completely.

Typical signs of a seized Dyane transmission

The following symptoms may indicate a blockage or damage in the transmission:

Symptom Possible meaning
A metallic noise suddenly occurs after driving in reverse A clutch or shift component may have come loose
The vehicle will not move The transmission may be internally locked
The clutch is engaging, but the drive remains locked Probable transmission failure
The shift lever feels unusual Shift forks or shift sleeves may be misaligned
The transmission feels as if two gears are engaged at the same time Shift components may be jammed

In this situation, do not force the gearshift or attempt to drive off. Also, do not use the starter motor to “free up” the vehicle. This can cause further damage to gears, shift sleeves, or shift forks.

What to do if the Dyane transmission locks up?

If the transmission locks up after driving in reverse, the vehicle should be secured immediately and not moved any further.

Recommended procedure:

  1. Secure the vehicle to prevent it from rolling away.
  2. Do not shift gears or drive off.
  3. Do not force the shift lever.
  4. Have the upper transmission cover inspected.
  5. Check the position of the shift sleeves and shift forks.
  6. Correctly position and secure the loose retaining bushing.
  7. Check the transmission oil for metal particles.
  8. Carefully check all gears before a test drive.

With a bit of luck, the cause can be identified and resolved by inspecting the upper transmission cover. Whether this is sufficient depends on whether consequential damage has already occurred.

When does a Dyane transmission need to be removed?

A simple inspection through the transmission cover is not always sufficient. Removal and complete disassembly are recommended if there is significant damage or metal wear.

Findings Recommendation
Retaining bushing severely damaged or loose Disassemble and inspect the transmission
Teeth damaged or broken Complete inspection required
Sliding sleeve damaged Replace component
Shift fork bent Inspect or replace shift fork
Metal debris in the oil Clean and inspect the transmission
Squealing noises after repair Inspect bearings, bevel gear, and ring gear

A loose bushing should not simply be screwed back in. It must be permanently secured. Depending on its condition, options include clean caulking, suitable threadlocker, or a professional mechanical lock.

Typical weak points in the Citroën Dyane transmission

In addition to the problem with reverse gear, there are other typical wear points that can occur in Dyane transmissions and related A-model transmissions.

Shifting problems and synchronizer rings

Cracking or sticking when shifting, especially between 2nd and 3rd gear or when downshifting from 3rd to 2nd gear, often indicates worn synchronizer rings.

Possible causes:

Cause Description
Worn synchronizer rings Common cause of shifting noises
Worn shift sleeve Gear does not engage properly
Worn guides Imprecise shifting feel
Old or incorrect transmission fluid Poor shifting performance

Bearing noises

Howling, humming, or grinding noises should be taken seriously.

Noise Possible cause
Howling under load Bevel gear, ring gear, or bearing
Rattling at idle Input bearing, primary shaft, or clutch area
Roaring in all gears Main bearing or differential bearing
Noise only in one gear Gear pair or gear bearing

Leaks

Leaks are common in older transmissions.

Location Possible cause
Output flanges Hardened oil seals or worn-in running surfaces
Shift cover Old gasket
Speedometer cable drive Defective sealing ring
Drain and fill plug Old sealing rings
Case seam Inadequate sealing following a previous repair

Transmission fluid for Citroën Dyane and Dyane 6

The Dyane’s transmission typically requires about 0.9 liters of transmission oil. The correct fill level is reached when oil leaks out of the side inspection port.

Recommendation for normal road use:

Point Recommendation
Quantity approx. 0.9 liters
Viscosity SAE 75W80
Specification Preferably mineral GL-4 gear oil
Filling level until oil leaks from the inspection port
Not recommended Engine oil, ATF, or very thin low-viscosity oils without a specific reason

A mineral 75W80 GL-4 transmission oil is usually a sensible and conservative choice for classic transmissions. If the history is unknown, the oil should be changed and checked for metal abrasion, water, or a strong odor.

Inspect the Citroën Dyane transmission before installation or repair

A Dyane transmission should be thoroughly inspected before installation, purchase, or repair. Many vehicles have been modified over the years. Therefore, the transmission originally installed is not always present.

Important checkpoints:

  1. Is it a drum brake or disc brake transmission?
  2. Is DOT/Lockheed or LHM used?
  3. What gear ratio is installed?
  4. Is the transmission compatible with the Dyane 4 or Dyane 6?
  5. Does the transmission fit the existing engine?
  6. Are the clutch, drive shafts, and speedometer cable drive compatible?
  7. Are there any shifting problems or noises?
  8. Are there any visible leaks?
  9. Is the correct transmission fluid used?
  10. Has the vehicle already been converted to a different drivetrain?

FAQ on the Citroën Dyane transmission

Which transmission is compatible with the Citroën Dyane?

That depends on the engine, model year, and braking system. A Dyane 4 requires a different setup than a Dyane 6. Additionally, the drum or disc brakes, brake fluid, clutch, and drive shafts must be compatible.

Is a 2CV6 transmission suitable for a Dyane?

A 2CV6 transmission may fit mechanically, but it isn’t necessarily the best choice. It often has shorter gear ratios and provides good low-end torque, but can cause higher engine RPM at higher speeds.

Is an Ami 8 transmission suitable for a Dyane?

An Ami-8 transmission may have a longer gear ratio and thus feel smoother. In a Dyane, however, handling can become sluggish, especially on hills or when loaded.

What is the difference between 8/31 and 8/33?

8/31 has a longer gear ratio and reduces engine speed at the same speed. 8/33 has a shorter gear ratio and improves acceleration. Which gear ratio is better suited depends on the engine and intended use.

Can LHM be mixed with DOT brake fluid?

No. LHM and DOT/Lockheed brake fluid must never be mixed. Doing so can cause serious damage to the brake system components.

Why does first gear make a clunking noise in the Dyane?

First gear is not synchronized. It should only be engaged when the vehicle is stationary. If it is engaged while rolling or while driving, shifting noises are normal and do not necessarily indicate a defect.