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note, it may be either stainless or bronze/oilite bush supplied with your seal
During a rebuild, you invariably find, that the mild steel bush that runs on the oil seal is badly rusted and you should change it, or the rust progresses further in to the gearbox and leaks oil in the boat. my solution is to replace this with a stainless steel or bronze bush that cannot rust, and you always replace the seal, so thats included too.
exact length to original. please ensure your flange surface is flat where this bush sits before bolting it back on, with sealant on the aft end of the bush, or you could get a drip with a badly seated bush even a new one like this.
Replacement Instructions
Drain gear oil
2 13mm and 17mm spanners to remove coupling nuts
Long bar or crowbar between 2 studs to stop flange revolving
24mm socket to remove flange nut
3 leg puller to remove flange
Tap/pull out woodruff key
Tap/pull off old bush (if rusted badly, it is difficult with gearbox on, so possible then by grinding/chisseling a notch/groove in it's middle and using the groove, chisel groove backwards. giving it a good ol tap around with a hammer and WD 40 up the end or in a small hole you can drill also works, (dont damage threads) . if the engine is not been badly rusted underneath and the last rebuilder greased the shaft before putting it on, then likely it will just slide off.
Lever out old seal with screwdriver
Wipe out old paint and rust with a rag
Tap in new seal with smear of sealant, it must be flat but does not matter how deep, id reccomend flush on the outside or sunk in up to 5mm. dont push in too far or it may drop inside the casting /a bit into the thrust bearing and youll have to pull it out and start again.
Slide on new bush, rotate it onto the thrust bearing inside to ensure theres no grit between the 2 (will tighten oil-tight)
replace woodruff key
Replace flange(i would dremmel the bore free of rust first and grease), tighten all nut
note the quickest way to ensure the back of the flange is flat seal onto your new bush, is to use a power sander, theres often a mm or 2 of rust and paint there.
Slide coupling back together and tighten nuts (should replace if nylock ones)
Refill 0.7l oil (my special oil is better than hypoy)
