2CV CRANKSHAFT OIL SEAL (rear)
1. Using a puller or a suitable sharp instrument, taking care not to damage the surface of the crankshaft, extract the failed seal from its recess. Before fitting the new seal, carefully wipe out the crankcase recess into which it fits with a clean rag to remove any debris and excess oil. Examine the recess carefully - you will note that the outward end of this recess is chamfered. The new seal MUST be an accurate and firm press fit so that its flat side (which is usually marked with the manufacturers name and/or seal dimensions) faces outwards and is EVENLY inserted so that it is flush with the inward edge of this chamfer, and exactly parallel with the outer end of the crankshaft (where the five flywheel mounting holes are located). Take care not to damage the lips of the seal.
WARNING: If during fitting the new seal is pushed, or slips too far into the recess, it will be useless and you will have to extract it and start again with another new seal!
ADDITIONAL NOTE: If fitting the seal as part of complete engine reassembly, fit both front and rear seals BEFORE fully tightening the crankcase sections.
2. Wipe the surface of the outside circumference of the seal so that it is free of all but the lightest film of oil - this is important and will help to ensure that you do not lose control of the seal as it enters the recess. Now coat the inner circumference lips of the new seal with a couple of drops of clean oil and then carefully slide it over the outward end of the crankshaft; the oil will prevent the lips being 'tucked under' or distorted as you do so. Gently rotate the seal about the shaft and gently manoevre it as necessary to ensure that the lips are not damaged and are correctly located, contacting the crankshaft all the way around its circumference.
(The engine must be removed for this procedure)
4. When it is correctly located, the outer surface of the seal must be parallel with the face of the end of the crankshaft where the flywheel fits throughout 360į. About 2 - 3mm of crankshaft should be protruding from the seal, and the seal should not be bulging or distorted in any way. The attached sketch shows the seal in its correct final location.
5. It is suggested you fit a replacement 'O' ring to the oil pump outer cover whilst the engine is out and the flywheel removed.
3. Now, slowly and carefully, FLAT SIDE OUTWARDS, press the new seal back into the recess with your thumbs, working them around its circumference so that it enters the recess evenly. If you cannot work it all the way into position using your fingers and thumbs, use a BLUNT drift to achieve the correct final location (see 1 above) using only gentle tapping with a small hammer or the palm of your hand, using minimal force, moving the drift around the seal outer face to ensure that it passes evenly into the recess.
ADDITIONAL NOTE: If you have the time and resources to make one, using a tubular drift with inside diameter 31mm, outside diameter 45mm and length of 100mm will greatly assist this task. This replicates CitroŽn special tool 3007.T.
THE WESSEX DUCKS
THE WESSEX DUCKS