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Cylinder head for Alle 2CV6

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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!

55 Articles | Page 1 of 2
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Citroën 2CV6 Cylinder Head for the 602-cc Engine

In the 2CV6 engine with a 602 cm³ displacement, the cylinder head is a particularly important component. The engine is air-cooled, has two horizontal cylinders, and therefore features two separate aluminum cylinder heads—one per cylinder.

Unlike many water-cooled engines, the 2CV6 has no large shared cylinder head assembly and no traditional cylinder head gasket between the cylinder and the cylinder head. Sealing is achieved through cleanly mating metal surfaces and proper installation.

What makes the Citroën 2CV6 cylinder head special?

Each cylinder head has the following components and functions:

Component Function
Intake valve allows the fuel-air mixture into the combustion chamber
Exhaust valve expels exhaust gases from the combustion chamber
Valve guides guide the valves precisely in the cylinder head
Valve seats seal the valves when closed
Spark plug thread holds the spark plug in place
Rocker arms and valve train control the opening and closing of the valves
Cooling fins dissipate engine heat into the air

Since the engine is air-cooled, the cooling fins, air deflectors, and fan must be in good condition. This is the only way to reliably dissipate the heat.

No traditional cylinder head gasket on the Citroën 2CV6

On the 2CV6, there is no conventional cylinder head gasket between the cylinder and the cylinder head, as found in water-cooled engines. Therefore, it is particularly important:

What to look out for Why it’s important
Clean sealing surfaces so that the cylinder head sits tightly on the cylinder
No sealant in the wrong place Sealant can compromise the seal
Proper installation prevents leaks and stress
Even tightening Protects the cylinder head, studs, and sealing surfaces
Correctly adjusted valve clearance Prevents overheating and valve damage

Leaks in the cylinder head area often occur not at the joint between the cylinder head and the cylinder, but at the pushrod gaskets.

Citroën 2CV6 Cylinder Head: Weak Points, Inspection, and Installation

Citroën 2CV6 spark plug thread in the cylinder head

The spark plug thread is located directly in the aluminum cylinder head. Aluminum is softer than steel, so the thread can be damaged if the spark plug is inserted at an angle or tightened too tightly.

Here’s what you should keep in mind:

Recommendation Reason
Only remove spark plugs when the engine is cold reduces the risk of thread damage
Screw the spark plug in by hand first prevents the spark plug from being installed crookedly
Do not tighten with excessive force protects the aluminum thread
Use the correct spark plug Prevents overheating and malfunction

Typical damage includes stripped spark plug threads, leaks around the spark plug, or cracks in the area of the spark plug hole. Citroën factory specifications clearly state that the spark plug may only be replaced when the engine is cold.

Citroën 2CV6 Exhaust Valve and Valve Seat

The exhaust valve is under particularly heavy strain in the 2CV6. It is heated significantly more by the hot exhaust gases than the intake valve.

If the valve clearance is too small, the valve may no longer close properly. As a result, it can no longer dissipate its heat sufficiently to the valve seat. The consequences may include:

Possible consequence Description
Poor cold start Compression may be lost
Loss of power Valve does not close properly
Burnt exhaust valve due to excessive temperature
Damaged valve seat due to poor sealing and overheating

Therefore, valve clearance should be checked regularly and set correctly (0.20 mm for intake and exhaust when the engine is cold).

Checking the valve guides on a Citroën 2CV6

Incorrect or worn valve guides can cause the following problems:

Problem Possible effect
Excessive clearance Oil consumption, smoke, poor running
Too little clearance Sticking valves
Incorrect combination of parts Leaks or engine damage
Worn valve seat Loss of compression

Citroën 2CV6 pushrod tubes and pushrod seals

Oil leaks in the 2CV6 engine often originate from the pushrod seals. These seals are located in the area of the pushrods and must be clean, free of tension, and installed the correct way up.

Typical causes of oil leaks:

Cause Effect
Damaged pushrods Gasket does not seat properly
Burrs on tube ends Gasket is damaged
Incorrectly installed gasket Oil leaks
Tight fit Leakage despite new gasket
Contaminated sealing surfaces No clean seal

It is important that the pushrod tubes are round, clean, and undamaged.

Don’t underestimate the 2CV6 cylinder head cooling

The 2CV6 cylinder head relies entirely on air cooling. Even minor issues with airflow can lead to overheating.

Particularly important are:

Component/Condition Importance
Clean cooling fins ensure heat dissipation
Complete air baffles direct cooling air to the right places
intact fan generate the necessary airflow
Correctly adjusted ignition prevents excessively high combustion temperatures
Correct fuel-air mixture too lean a mixture can cause overheating
Correct valve clearance protects the exhaust valve in particular (0.20 mm intake and exhaust with a cold engine)

Inspection before reinstalling the Citroën 2CV6 cylinder head

Before installing a used or reconditioned cylinder head, the following points should be checked:

Inspection point What to look for
Spark plug threads Clean, sound, not stripped
Combustion chamber No cracks or severe damage
Area around the spark plug hole no cracks
Valve seats No chipping, no severe dents
Exhaust valve not burnt, not warped
Valve guides No excessive play
Cooling fins clean, complete, not severely damaged
Sealing surface against the cylinder clean, flat, without dents
Rocker arm and shaft no significant play
Tappet tube area Sealing surfaces and tubes undamaged

Notes on installing the Citroën 2CV6 cylinder head

You should work with particular care during installation. The cylinder head must not be installed at an angle or with excessive tension.

Important points:

Step Recommendation
Clean sealing surfaces Only clean surfaces provide a reliable seal
Carefully place the cylinder head in position Do not tilt
Align the intake and exhaust systems Prevents stress; first tighten the cylinder head, then install the intake and exhaust manifold studs
Tighten the nuts in stages Ensure even load on the head
Insert the pushrods correctly Prevents damage to the valve train
Adjust valve clearance after installation Always check when the engine is cold
Check after a test run Check for oil leaks and smooth operation

Important customer notice regarding the Citroën 2CV6 cylinder head

With the 2CV6 cylinder head, problems usually arise not from major component damage, but from minor installation or maintenance errors. The following are particularly frequently affected:

Area Typical problem
Spark plug threads Damaged by incorrect installation
Exhaust valve Overheated due to excessive valve clearance
Tappet tube gaskets Oil leak due to incorrect installation
Cooling Overheating due to missing air baffles
Valve guides Wear or incorrect combination of parts
Installation Tension due to uneven tightening

Summary for customers

The cylinder head of the 2CV6 engine is robust but requires careful handling. It is particularly important to ensure clean sealing surfaces, a flawless spark plug thread, correct valve guides, intact tappet tube gaskets, complete air cooling, and properly adjusted valve clearance.

Do not use excessive force when working in this area. Do not apply sealant to unsuitable areas, always install spark plugs carefully by hand, and have valve clearance and cooling checked regularly. This will help you avoid leaks, overheating, and consequential damage to the engine. By the way: We also offer new cylinder heads.