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Exclusive from Mini Mania! For your 1098cc Morris Minor or Spridget. If you are tired of dripping oil onto your driveway and clutch, this crankshaft rear seal kit is the real thing. It allows you to replace the scroll seal with a real rubber seal! A special aluminum casting bolts right on to the block with no fabrication required. RIC778 (1098cc), Replacement seals only are available as RIC778/S.
The stock factory engine uses a 'scroll seal' which is not really a seal at all but simply a technique to try to keep the oil from not getting out from a rotating surface. There is no maintenance possible on the stock set up as it actually is a metal to metal system with no replacable parts involved. As it wears the engine simply leaks! This video was done on a 1275cc engine, but the installation is the same.
Crankshaft Oil Seal Adapter - Install Instructions
Looking at the main bearing cap, you will see that the end face (fig 2 & 3) is already machined flat. However the height of this end face from the block is critical to the sealing of this kit, and must be carefully measured. There needs to be a dimension of 11 mm from the block face to the main bearing cap. This must be both flat and square to the block (fig 3) but it is unlikely you will have to do anything with this dimension on the 1300 engines as it seems fairly stable from new, but check it anyway.
The triangular alloy part of this kit is also 11 mm thick and when screwed to the block its outer face must be level with the end face b of the main bearing cap throughout its length (see fig 2). This part of the fitting process is the longest and requires a good deal of accuracy, as it is essential to the complete sealing of the kit to the block. Experience has shown that the 11mm dimension is fairly consistent on production engines, however should adjustment be needed this measurement can be achieved either by surface grinding, or very careful filing. Either way accurate measuring is essential. In the very unlikely event of the height already being more than 11mm, you can remove up to 1mm from the triangular alloy part to compensate.
The silicon sealant in this kit will accommodate a small degree of tolerance in the dimensions, adequate for a correctly assembled unit. But it will not seal large gaps or irregularities effectively against the engine oil pressure at this point.
Having completed the above, place the triangular alloy part to the block, held loosely with one socket head screw in the top hole, check that the engine back plate will pass over it all. It is machined to the same shape as the part removed, but some careful filing may be required either to the back plate or the triangular alloy part.
Apply a coating of sealant to the mating faces of the triangular alloy part where it meets the block and the main bearing cap, but do not use a gasket. Fig 4. Position on the block ensuring that it sits centrally against the main bearing cap faces and the three screw holes line up.
Refit the engine back plate now.
Separate the two halves of the circular carrier by unscrewing the two :mm socket screws in its periphery. The upper half is held to the triangular alloy part by the three countersunk screws in the kit, working them gently down between the flywheel flange and carrier; be sure to engage the thread in the block squarely. Use sealant between the triangular alloy part and the upper half faces and fit to block. Tighten the screws evenly to about 5lbs pressure ensuring that the edges of the upper half and the triangular alloy part are aligned at the main bearing cap . Put a coating of sealant around the seating area of the upper halt and of the lower half ; on the back face of the lower half, into and around the groove and on the ring joint faces and main bearing cap end face. Lubricate the seal lip with a little oil or grease, also packing lightly the back recessed side of the seal. The seal is fitted in the normal way, with the grease filled cavity inwards and the flat face visible from the outside. Ease it over the flywheel boss and into the alloy carrier upper halt Push on the lower half, taking care with the sealant, and screw the two halves together. Apply some more sealant around the joint between the lower half and main bearing cap, just for good measure. Allow at least 8 hours for the sealant to cure before running the engine.