Citroen 2cv special tools     |     home


complete set

Front seal tool £71.00
Rear seal tools £97.00
or hire.
                             Front and rear crank oil seal replacement
  All of these tools are available for hire too                                                      2  videos at bottom of the page

                     Steel type tools                                                 Delrin thermoplastic type                                      

There are 3 sizes of rear oil seal inserters. Front oil seals are the same size on ALL 2cv engines, the rear ones are all different sizes The rear tools all differ in size to accomodate different crankshaft sizes for the flywheel attachment and enable the oil seal to be inserted correctly to the correct depth They all consist of 3, 8mm x1mm cap head screws, a centralising adapter with a slight taper, which fastens to the crankshaft with the screws, it is centralised with an additional hole for the crank/flywheel dowel and is 0.1mm oversize of the crankshaft, the oil seal pusher, the cup mandrel and a long 10mm x 1.50mm bolt and nut.
OPERATION----- rear seal.
Look at the hole that the seal will fit into. You will see a taper in the casing at the beginning of the hole. The seal, when in its proper position, will be up to the end of this taper on the inside. The shape and size of the tool pusher face ensures that this is where the seal will be positioned.  Also, there is a 2mm x 45 degree recess in the front of the centralising adapter. This is there for a very important reason. The end of the crankshaft has a 1mm x 45 degree taper and as the centralising adapter in 0.1mm oversize of the crankshaft diameter. When the tool goes over the end of the 1mm x 45 degree taper and is tightened up, it is actually over the end of the crankshaft by 0.1mm. This enables the seal to be pushed directly onto the crankshaft without any gap between the crank and the tool, thus eliminating any  damage to the lip of the seal.

Oil the crank seal entrance hole on the casing. Oil the adapter and seal and slip the seal onto it, then slip the pusher on as well. Offer the adapter to the crankshaft and insert the 3 screws and tighten them slightly only, As the screws are tightened, take notice of the 1mm x 45 degree taper on the end of the crank. It should just disappear as the tool gets to its final place. This ensures that the seal lip will transfer from tool to crank without damaging it.  Next, offer up the cup and long bolt. Screw in the bolt until it bottoms, whilst keeping the cup central and onto the pusher. Everything is now in line and centralised to the crankshaft. Screw the nut down until it is just tight to insert the seal, The seal is inserted correctly and to the correct depth and will be leak proof and should be at the bottom of the taper on the entrance to the hole in the crankcase. The engines for the 3 sizes of inserter are as follows. 425/435, M4, 602.

Front oil seal insertion.

                   Steel type tool                         Delrin plastic guide. The taper inside fits the crank taper, push and turn to lock it.

The seal pusher tube slides over the crank guide and this eliminates any play, so keeping the tool in line with the seal.
All 2cv engines have the same size of front crankshaft oil seal, so, one tool will do all of these seal insertions.

The tool consists of a pusher tube, long 10mm x 1.50mm bolt and a nut. The seal has to go to the correct depth and the pusher is machined to achieve this.

OPERATION front seal insertion

Oil the seal and the entrance hole and slip the seal up to the hole and adjust it squarely. Mount the flat face of the seal pusher tube up to the seal face. Fasten the tube to the crankshaft until the bolt bottoms and finger tighten the nut. Screw down the nut until it is just tight. The seal is inserted correctly and to the correct depth and will be leak proof. It will be flush with the crankcase bore. If the plastic type tool is being used, firstly position the seal and then simply mount the guide onto the crank. Push the tube over the guide and up to the seal face and enter the bolt until it bottoms. Tighten the nut. Do not overtighten.


                                            complete tool                                                                                                              adapter
                                                                                                                                 the hole in the middle is the same size as the spigot bush housing,
                                                                                                                                             therefore the tool must be central to the crankshaft

                 The taper is visible                                                                             The centre of the adapter is an exact fit onto the crankshaft spigot bush
                                                                                                                               housing and centres the tool to prevent any damage to the seal.
                                                                                                                               Note the taper. This goes over the slightly smaller taper on the end of the crank.

                                   cup pusher

                                                           seal pusher
                                                    The rear oil seal inserter tools


              The depth inside the tool is machined accurately to ensure correct seating of the seal

The depth in the tool is critical to insert the seal to its correct position. When installed the seal will be flush with the crankcase.