oil filler neck, 5 liters engine oil 20W50. 1x substitute oil filter. Engine: please fill oil up and adjust the valves. Plus old part deposit: 400 Euro. Caution: Please send old part without motor oil inside. Old parts containing oil cannot be taken back! (protection of the environment)
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.
The Citroën 2CV was unveiled at the Paris Motor Show in 1948 and was originally equipped with a 375 cc boxer four-stroke engine. This engine was used in the first 2CV model, the Type A, from 1949 to 1954.
The subsequent AZ and AZU models had a displacement of 425 cubic centimeters (66 mm bore).
For the model years 1968 through 1979, the 2CV4 Type AZ A2 was offered with an engine featuring a displacement of 435 cubic centimeters (68.5 mm bore).
In 1961, the 2CV engine with a displacement of 602 cm³ was introduced alongside the 2CV AZAM. This engine is the most widely produced 2CV engine and was used until production ceased in 1990. The version with a 602 cm³ displacement underwent four further developments and, throughout its history, weighed a consistent 66 kg.
By the way: In Germany, the 602-cc engine was listed as only 597 cc for tax reasons. However, the engine is identical in construction to the 602-cc engine—a nice gesture by Citroën so that customers would have to pay slightly less vehicle tax.
The 602 cc engine is installed in numerous 2CV sedan models, including the 2CV6 (Type AZ KA), the Spécial (Type AZ KB), and the limited-edition 2CV series Charleston, 007, Dolly, Cocorico, and France 3 (Type AZ KA).
This engine was also installed in numerous 2CV delivery vans such as the Kastenente, the AK350, and the AKS400, as well as in related models such as the Dyane 6, Ami 6, Méhari, and Acadiane.
The 602 cm³ engine is the most powerful engine in the 2CV series. Depending on the model, maximum power output reaches up to 33 hp.
In Germany, a slightly detuned version designed for unleaded regular gasoline was installed starting in 1988. In this version, the 602 cm³ engine had a compression ratio of only 7.8:1. Citroën also released a special model for this engine: the legendary “I fly unleaded” 2CV.
| Model / Series | Engine Type | Displacement | Badge | Officially offered in France | Officially offered in Benelux | Officially offered in Germany | Officially offered in Spain |
|---|---|---|---|---|---|---|---|
| 2CV A | A | 375 cc | Q(x) / A | 1949–1954/55 | approx. 1952–1954/55 | early individual imports | not official |
| 2CV AU Fourgonnette | A | 375 cc | Q(x) / AU | 1951–1954 | approx. 1952–1954/55 | rare imports, period not clearly documented | not official |
| 2CV AZ | A53 | 425 cc | AZ | 1954–1960s / until replaced by newer AZ variants | from 1954, officially sold in Belgium/Benelux | officially sold; exact model-specific period not clearly known | from approx. 1959 as the Spanish 2CV sedan |
| 2CV AZL | A53 | 425 cc | AZ | 1956/57–early 1960s | Officially sold in Belgium/Benelux, some with custom features | Officially sold, exact years unknown | Exact years unknown |
| 2CV AZLP | A53 | 425 cc | AZ | from 1957/58–1960s | Benelux/Belgium comparable luxury trunk variants | Officially sold, exact years unknown | Exact years unknown |
| 2CV AZAM | A53 | 425 cc | AZ | 1963–1967 | Belgian AZAM/AZM variants from the 1960s | Officially sold, exact years unknown | Spanish AZAM version documented, years not precisely determined |
| 2CV AZAM 6 / 3CV | M4 | 602 cm³ | AM / AX / AZX depending on version | France only briefly as a special export-oriented version in 1967 | Belgium: officially Feb. 1965–Oct. 1967 | Offered in Germany as the 3CV around 1966/67 | Spanish 602 variants documented, but not clearly distinguishable as AZAM 6 |
| 2CV AZU | A53 | 425 cc | AZU / AZ | 1954–ca. 1967 | Officially sold starting in 1954 | Officially sold, exact years unknown | Official from 1958/59; AZU production/availability documented until ca. 1970 |
| 2CV AZU / AK 250, later 425 | A79/0 | 425 cc | AYA | approx. 1967–1970/72 | Official, market-dependent | Officially sold, exact years unknown | Spanish commercial vehicle variants |
| AK 250 / 435 commercial vehicle | A79/1 | 435 cm³ | AYA2 | From the 1970s, depending on the commercial vehicle program | Official, market-dependent | Officially sold, exact years unknown | Cannot be clearly distinguished from AK 250 / 435 |
| AK 350 | M4 | 602 cm³ | AK / AM / AX | 1963–1970 | Official, market-dependent | Officially sold | Spanish AK/AKS commercial vehicles documented from 1967 |
| AKS 400 / AK 400 | M28/1 | 602 cm³ | AK2 | 1970–1977/78 | officially | Officially sold | Spanish AK/AKS documented until 1978 |
| 2CV Sahara / 4×4 | 2 × A53 | 2 × 425 cc | Registration number per engine | 1960–1968 | Officially very rare / single-unit market | Officially very rare, no regular mass production | Documented for the Guardia Civil around 1965 |
| 2CV4 | A79/1 | 435 cc | AYA2 | 1970–1978/79 | Official, but Benelux models may vary depending on the market | not, like in France, a direct replacement for the AZ/AZA in 1970; availability limited/different | not known as a major Spanish model |
| 2CV6 early version | M28/1 | 602 cm³ | AK2 | from 1970 | officially from the 1970s | officially from the 1970s | Spanish 2CV6 / 2CV6 CT |
| 2CV6 later version | M28/1 | 602 cm³ | A06/635 | 1970s–1988 France | Officially produced/imported until the late 1980s | Officially imported until production ended in 1990. | Spanish 2CV sedan until approx. 1984 |
| 2CV6 late export/emissions variants | M28/1 | 602 cc | A06/642 / A06/644 / A06/664 | late 1980s, depending on market | late 1980s, depending on the market | particularly relevant for late German models, with a special engine type and reduced compression | |
| Early Dyane 425 | A79/0 | 425 cm³ | AYA | 1967–1968 | Officially sold from 1967/68 | Officially sold | Spain: Dyane model range documented, exact early 425 model classification uncertain |
| Dyane 4 | A79/1 | 435 cc | AYA2 | from 1968/70 | officially | officially sold | |
| Dyane 6 early model | M4 | 602 cc | AM / AX / AZX | from 1968 | officially | officially sold | Spanish Dyane 6 |
| Dyane 6 later model | M28 | 602 cc | AM2 | approx. 1968/69–1983 | Officially sold until 1983, depending on the market | officially sold | Spain: Dyane 6 officially documented |
| Méhari | M28/1 | 602 cc | AK2 / A06/635 | 1968–1987 | Official/Imported | not imported, registration difficulties | Spanish Méhari in Vigo |
| Méhari 4×4 | M28/1 | 602 cc | A06/635 / M28/1 | 1979–1983 | Official/imported, limited production | not imported, registration difficulties | unknown |
| Ami 6 | M4 | 602 cc | AM / AK / AX | 1961–1969 | officially | Officially sold | Spain with different local model/naming conventions |
| Ami 8 | M28 | 602 cc | AM2 | 1969–1978 | officially | officially sold | In Spain as the Citroën 8 / 8 Familiar instead of the classic “Ami 8” |
| Acadiane | M28/1 | 602 cc | AM2A | 1978–1987 | Official/Imported | Official/imported | Spain: Dyane 6-400/Acadiane-based commercial vehicle line, exact designation depending on the market |
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