Engine capacity: 602ccm. Engine: M28, R6, 627. Compression 8,5:1. Inclusive Piston rings. Piston pin: 20 x 63,5mm. High-quality reproduction from the European Union.
Engine capacity: 602ccm. Engine: M28, R6, 627. Compression 9:1 (32HP). Inclusive Piston rings. Piston pin: 20 x 63,5mm. High-quality reproduction from the European Union.
Reproduction. Measurements: 1,75 + 2.0 + 3,5mm. Or.Nr.: 5503402.
m bore. Improved version with 2 steel rings! The benefits are: Higher running performance, resistant, improves adaptation to the liner, less friction, reduction of the oil consumption!
manufacturer! Measurements: 1,5 + 2.0 + 4,0mm
the original tools and with the original materials (this factory produce the 2CV for the South American market). Attention, there are also cheaper crankshafts from China, but we do not offer them for quality reasons.
completely: 15,6mm.
pistons + liners with compression ratio 8.5:1. New cylinder head left + right (incl. valves and rocker arms). Engine gasket set with oil seals, oil filler neck, oil filter. The crankshaft and camshaft are overdimensioned and can normally be used for a running performance of 500,000 km without any problems.
compensate the tooth flank play! Suitable for Citroen 2CV6, AK, ACDY, Dyane, Mehari, AMI. Or. No. A122-98. Diameter: 10.5mm. Length: 21mm.
could find a stock, with supported over 400 original camshafts. These are now in our existence.
diameter: 22,1mm, height length: 25mm
length: 25mm. Original No. 75420101
per piece. Note: Flywheel screws are necked-down bolts and should be always changed, if it released.
2CV. Inside diameter: 12mm, outside diameter: 18mm, height: 18mm.
for Citroen 2CV4 + 2CV6, up to year of construction 02/1972. Design = needle bearing. Inner diameter: 12mm, outer diameter: 18mm, height: 10mm. Or. No. ZC9620 322U
for Citroen 2CV6, from year of construction 03/1973 to 1990. design = needle bearing. Inner diameter: 12mm, outer diameter: 18mm, height: 16mm. Or. No. AM9121 100L
approx. 12kg. Also suitable for Citroen Dyane, AK, AMI. All 602cc engines with front drum brake. Or. No. AY8312-000.
produce again the complete fly wheel with gear rim, since the old gear rims are often worn. The fly wheel is fine-heaved and ready for assembly. Or. No. 95559486. Produced in Europe.
Citroen for 2CV6. Size: 11,9x18x4mm. Or. No. 95495074. Made in Germany.
Citroen for 2CV6. Size: 12x18x3mm. Or. No. 7903078053. Made in Germany.
d reproduction. 2CV after 1967.
replacement on an electronic ignition.
This overview applies to the small Citroën A-series commercial vehicles AZU / AZU 250, AK / AKS 350/400, and Acadiane. The very early AU model with a 375 cm³ engine is not included.
Important: Commercial designations, model years, and engine variants do not always correspond exactly. To ensure accurate part identification, the engine plate on the engine block should therefore always be checked. Displacement alone is often insufficient for these vehicles.
| Vehicle / Model | Engine plate / Engine type | Displacement | Bore × Stroke | Technical feature |
|---|---|---|---|---|
| AZU early 425-cc version | A53 / AZU | 425 cm³ | 66 × 62 mm | Early 425cc engine with varying compression ratios, power output, and tuning depending on the model |
| AZU late 425 cc version / AZU-A | A79/0 / AYA | 425 cm³ | 66 × 62 mm | Still 425 cm³, but a more powerful, later version |
| AZU 250 / AZU-B | A79/1 / AYA2 | 435 cc | 68.5 × 59 mm | 435cc engine with a larger bore but shorter stroke than the 425 |
| AK 350 early 602-cc version | M4 / AM / AK | 602 cc | 74 × 70 mm | Early 602 engine, technically closer to the early Ami-6 engine generation |
| AKS / AK 400 | AK2 / M28/1 | 602 cc | 74 × 70 mm | Later 602 commercial vehicle version, robust and designed for everyday use |
| Acadiane | AM2A / M28 family | 602 cc | 74 × 70 mm | Custom Acadiane tuning, not simply identical to Dyane 6 or Ami 8 engines |
There are several piston and cylinder variants in the Citroën A commercial vehicles. It is particularly important to distinguish between 425 cm³, 435 cm³, and 602 cm³.
The 425-cc engines have a bore of 66 mm and a stroke of 62 mm. These engines were used in various power ratings. Therefore, early and late 425 models should not be treated as identical across the board.
Differences may exist, particularly in pistons, cylinders, compression, carburetor tuning, and camshafts. The engine plate is therefore crucial for selecting the correct replacement parts.
The 435-cc engine has a bore of 68.5 mm, but a stroke of only 59 mm. It is therefore not simply a bored-out 425 engine.
This is an important point: Although the displacement is larger, the stroke is shorter. As a result, the crankshaft also differs from that of the 425-cc engine. The pistons/cylinders and crankshaft must therefore be compatible with the 435-cc version.
The 602-cc engines generally have a 74 mm bore and a 70 mm stroke. Nevertheless, not all 602 engines are the same.
Early M4 engines, later M28/M28/1 engines, and the AM2A version of the Acadiane differ in details such as compression ratio, carburetor, camshaft, and tuning. For repairs, you should therefore not select parts based solely on “602 cm³.”
In the A models, the camshaft is a key component of the engine’s characteristics. It influences power, torque curve, smoothness, and the appropriate carburetor tuning.
Especially with the 425-cc engines, there were different power ratings over the course of their production. These differences arose not only from different carburetors or compression ratios, but also from modified camshaft tuning.
A distinction must also be made with the 602-cc engines. An AM2 engine from a Dyane or Ami 8 is not automatically identical to an AK2, M28/1, or AM2A engine. The Acadiane has its own tuning and is designed more for fuel economy and commercial vehicle use.
The crankshaft should always be selected based on the stroke and engine configuration.
| Stroke | Compatible engines | Meaning |
|---|---|---|
| 62 mm | A53 and A79/0, 425 cm³ | Typical 425 crankshaft |
| 59 mm | A79/1, 435 cm³ | Special 435 cc crankshaft with shorter stroke |
| 70 mm | M4, M28, M28/1, AM2A, 602 cm³ | Base stroke of the 602-cc engines |
The difference between 425 cm³ and 435 cm³ is particularly important. Despite having a larger bore, the 435 engine has a shorter stroke. A 425 crankshaft therefore does not simply fit the 435 version.
For an AZU with 425 cm³, you should first check whether an A53 or an A79/0 is installed. Both variants have 425 cm³, but differ depending on the production year and tuning.
For the 435-cc engine, 425-cc and 435-cc components must not be mixed. The key specifications are a 68.5 mm bore and a 59 mm stroke.
For early AK-350 engines with M4 technology, you should carefully check which engine version is installed. These early 602 engines are not automatically equivalent to later 2CV6, AK400, or Acadiane engines.
The AK400 typically features a robust 602-cc version with a 74-mm bore and 70-mm stroke. These engines are designed primarily for commercial vehicle use, durability, and economical operation.
Although the Acadiane also has a 602 cm³ displacement, it is not simply a Dyane 6 with a panel body. The AM2A engine has its own specific tuning. To achieve the original characteristics, the compression ratio, camshaft, and carburetor tuning should match the Acadiane version.
No. While the 435-cc engine has a larger bore of 68.5 mm, it has a shorter stroke of 59 mm. As a result, the crankshaft also differs from that of the 425-cc engine.
No. Although the M4, M28, M28/1, AM2, and AM2A have the same base displacement, they can differ in compression ratio, camshaft, carburetor, air intake, and engine characteristics.
Not without careful inspection. The Acadiane AM2A engine has its own specific tuning. Converting it to AM2 characteristics may be technically possible, but it alters the original engine characteristics.
The most important specification is the engine plate on the engine block. Displacement and vehicle model alone are often insufficient for Citroën A-series models.
The camshaft influences power delivery, torque curve, and the appropriate carburetor tuning. Especially for 425-cc and 602-cc engines, there are different versions that are not interchangeable.
For Citroën AZU, AK, AKS, and Acadiane models, engine identification should always be done carefully. The engine plate, bore, stroke, compression ratio, and camshaft tuning are particularly important.
A 425 engine is not automatically identical to every other 425 engine; a 435 engine is not simply a bored-out 425; and a 602 engine can be tuned quite differently depending on the version. For a reliable repair and the right replacement parts, the exact engine identification should therefore always be checked.
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