Citroen 2cv special tools | home
push rod tube extraction and insertion tools
the push rod tubes are sealed, to prevent any oil leaks, with a special Citroen tool, that roles the inside of the tube that creates a tight fit into the head bores. They are rolled and sealed in 2 positions each, at the top of the tube and where it exits the head area. These tools are unavailable anymore, so I have created an alternative.
One tool knocks the tube out of the bore. Where the tool fits into the tube, you will see that the tube penetrates into the head space by about 2mm. This is the point where the tool will start to knock the tube out, so care must be taken, to not damage the tube or flare it over, as it could scratch the bore.Gently knock the tool down and the tube will move. Citroen said that you must hacksaw the tube length off and then hacksaw the tube inside to split it and then knock it out. This is unnecessary and could, if not done really correctly, totally render the head useless. You do not need to saw the tube in half either as all you are going to do is to knock it out, carefully.
Clean and inspect the 2 bores. They must be spotless. Look inside the bores and you will see that the aluminium is separated by the fins into 5mm wide sections. Only at the top and bottom of the head are solid parts and this is where the tube seals, not on the entire length of the bore. Insert a new tube, carefully, and position it correctly to its correct protrusion out of the head bottom until it is about 2mm proud of the head at the top.
Push rod tube expander and removal drift. The expander has 3 balls around the circumference and another ball inside the tool.
Screwing the bolt down, it pushes the internal ball onto the 3 expander balls and they
begin to move outwards and grip the inside of the tube. Turn the tool one revolution and
inspect the groove created. Ideally, it should be 0.5mm deep all around. There are depth
marks on the tool to assist putting it in the correct place. You can move the tool down
10mm and create another groove. Release the tool and move it downwards to the next
mark and repeat the above.
IMPORTANT---- The new tubes are an aluminium alloy and must be annealed before
attempting the expansion process.