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Cylinder head for Alle AMI6-8

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Elbow seal inlet 2CV6, improved version. The seal is made of most significant seal material

Preparation of Reinz Germany. Measurement: 28,3x43,75. Or.Nr.: 96177787

Engine repair kit (new parts only). Suitable for Citroen 2CV6, Dyane6, Mehari. Consisting of 2x

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.

Engine repair kit (new parts only). Suitable for Citroen 2CV6, Dyane6, Mehari. Consisting of 2x

pistons + liners with compression ratio 9:1. 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.

Oil line for 2CV6, significant reproduction from the European Union. Produced from cuprous nickel

(Oil line from the engine block to the cylinder heads)

Valve push rod tube for 2CV6 (602ccm engine), first version. Length: approx. 192mm. The valve push

rod tube has an outer diameter of 18mm. The fit (offset on the valve push rod tube) on the cylinder head is 17x34mm. Suitable for all 2CV engines with 602ccm. High quality reproduction from the EU.

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Valve push rod tube for 2CV6 (602ccm engine), first version. Length: approx. 192mm. The valve push

h rod tube has an outer diameter of 18mm. The fit (offset on the valve push rod tube) on the cylinder head is 17x34mm. Suitable for all 2CV engines with 602ccm. Reproduction

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Follower tubing seal - sheet metal plates, for Citroen 2CV6 starting from year of construction

10/1972. Suitable for the follower tubing seal with narrow connecting post. Per piece!

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Citroën Ami 6 Cylinder Head: Important Notes on Choosing Parts

With the Ami 6, you must carefully check which 602-cc engine is installed. The Ami 6 is not simply a “2CV6 with a different body.” There are several technical differences and variations, particularly regarding the cylinder head.

Basically: The Ami 6 has two separate aluminum cylinder heads

Like the 2CV6, the Ami 6 has an air-cooled two-cylinder boxer engine with a separate aluminum cylinder head for each cylinder.

The basic design is similar:

  • no water-cooled cylinder head
  • no classic cylinder head gasket as found in water-cooled engines
  • two valves per cylinder head
  • Valve actuation via pushrods and rocker arms
  • Cooling via forced air

The Ami 6 has a displacement of 602 cm³ with a bore of 74 mm and a stroke of 70 mm.

Citroën Ami 6 Cylinder Head: Differences by Engine Generation

There are several engine groups for the Ami 6. These differ significantly in technical terms and are important for selecting the appropriate cylinder head and valve parts.

Production period / Version Engine Compression / Power Significance for the cylinder head
Early Ami 6 from 1961 M4 / AM 602 cm³, low compression Early valve and cylinder head design
approx. 09/1963 to 05/1968 M4 / AM M, AM B, AM C 602 cc, approx. 7.75:1 many parts are not identical to later 2CV6/M28 engines
from approx. 05/1968 M28 / AM2 602 cc, approx. 9:1 Technically closer to the Ami 8 and later 602-cc engines, but not automatically identical to the 2CV6

To ensure correct part selection, you should therefore not rely solely on “602 cm³,” but always check the engine type and the specific model.

What is special about the Ami 6-cylinder head?

Early heads have different valves

An important point is the different valve designs. Various valves were used in the Ami 6 over the course of production.

Valve Early / mid-Ami 6 version
Intake valve up to approx. 04/1963 41 mm valve disc, length 88.3 mm
Intake valve up to approx. 02/1968 39 mm valve disc, length 88.8 mm
Exhaust valve up to approx. 10/1967 34 mm valve disc, length 87.5 mm, single groove
Exhaust valve approx. 10/1967 to 05/1968 different design with 3 grooves

This means: Valves, spring seats, valve wedges, and guides should not be selected indiscriminately based on “602 cm³ Citroën.” The decisive factors are engine type, year of manufacture, and the actual valve design installed.

Asymmetrical valve covers were used until 1968

Asymmetrical cylinder head covers were used on the Ami 6 until around July 1968. These must be installed the right way up. The marking on the cover, usually a stamped circle on the edge, must face upward.

This is important because an incorrectly installed valve cover may leak or not sit properly on the cylinder head.

Do not fully tighten cylinder heads until after the intake and exhaust manifolds have been installed

On the Ami 6, the cylinder heads should not be fully tightened immediately. First, the intake and exhaust manifolds must be installed and aligned. Only then should the cylinder heads be fully tightened.

The reason: The shared intake/exhaust manifold connects both cylinder heads. If the heads are tightened first and the manifold is then installed under tension, stress can build up.

Possible consequences include:

  • Leaks
  • Damaged manifold gaskets
  • Stress on the cylinder head
  • Subsequent installation problems

Later Ami 6 models with M28/AM2 engines are technically closer to the Ami 8

Starting around 1968, the Ami 6 was equipped with the more powerful M28/AM2 engine. This engine has a higher compression ratio of about 9:1 and technically belongs more to the later 602-cc generation.

Nevertheless, a later Ami 6 should not automatically be treated like a 2CV6. Here, too, the engine type, year of manufacture, and existing components must be checked.

An early Ami 6 M4 cylinder head will not fit a later M28/AM2 engine without careful inspection.

What you should pay particular attention to with the Ami 6

Checkpoint Why it’s important
Check the engine type label AM, AM M, AM B, AM C, or AM2 determines which parts are compatible
Measure valve diameter Early and later Ami-6 valves differ
Check the number of valve keyways especially important for the exhaust valve before and after approx. 10/1967
Check the valve cover Asymmetrical until approx. July 1968; the mark must point upward
Install the manifold before final tightening Prevents stress on the cylinder heads
Check spark plug threads Aluminum cylinder heads often have damaged or stripped threads
Check the exhaust valve and valve seat Air-cooled engines are subject to high thermal stress
Check cooling fins and air deflectors Poor airflow can lead to overheating

Difference between the Ami 6 and the 2CV6

When people think of the 2CV6, they usually think of the later, well-known 602-cc engine generation.

With the Ami 6, a much finer distinction must be made. Of particular importance are:

  • Early M4/AM engines
  • Different valve designs
  • Production dates up to approx. 05/1968
  • asymmetrical valve covers up to approx. 07/1968
  • Differences between early and late 602-cc engines

Recommendation for selecting the correct Ami 6 cylinder head

When working on an Ami 6, you should never simply search for or order a “602 cylinder head.” Always check first:

  • the engine type
  • the model year
  • the valve diameter
  • the type of valve lifters
  • the valve cover design
  • the existing cylinder head and manifold assembly

It is precisely these points that often lead to incorrect part assignments or installation errors.