Hi all, I have been working on the combi and have a few notes that may be helpful to others...
Removal.
I had first bought a kit containing the various oil seals, O rings and bearing from Steve Birch and proceeded to follow his instruction sheet.
The instructions are very good and most things went according to plan. Couple of things....
Item 13 says to rotate the flywheel to undo the clamp nut. When I did this the flywheel nut came undone instead! I ended up having to tighten the flywheel nut quite a lot and then trying again as instructed. Worked fine the second time.
Item 14 says use "fulsome" blows on the end of the prop boss - I had to look up what "fulsome" means then gave it a smart crack with a wooden mallet - worked a treat!
Item 16 - removing the key and clamp rings - BE CAREFUL! I managed to drop one of the clamp rings and I am now unsure which way round it goes on re-fitting!!!! If anyone knows please advise!
Steve supplies a few extra seals and O rings - I could not work out were they all fitted until I rang him and he said they were just extras!
The only real issue was removal of a large oil seal at the rear of the engine (size 65mm int, 100 ext, 10 width).... it is quite far in and took a bit of messing with a screwdriver to get it out. I was worried about damaging the housing but when I got the correct angle on the screwdriver it levered out quite easily.... BE CAREFUL when fitting the new one - I managed to get the lip of the seal to roll over on itself and I had to take it out again and damaged it in the process! I would normally use the old seal to push in the new one square but you can't get at it! Any tips on a "safe " way to insert the new replacement when it arrives? (all the seals are standard sizes and are widely available....the smaller ones are 22mm, 40 mm, 7mm, and 24mm 35mm, 7 mm...)
The prop shaft came out easily and the stern bearing was badly worn... maybe 2mm +so I have asked Steve to send me a new Vesconite replacement ( I think he used to use Nyoil but Vesconite is apparently better in a submerged environment) The stern gland, with its own little oil reservoir, seemed in good order but I shall replace the seals and white metal bearings anyway.
The control tube had been replaced recently ( I found the old one in the boat). The old one showed VERY bad wear in the area of the stern bearing... loads of metal had worn away from the shaft ... not sure how this could happen because the housing has a tufnol? bush... weird. Anyway the new one is fine.
A good place for seals and bearings is Simply Bearings Ltd ~ Oil Seals SKF FAG TIMKEN KOYO NTN NKE TRULOC Needle Rollers Taper Rollers Rod Ends Oil Filled Bushes Loose Balls O Rings Grease Plain Thrust.... they have a wide selection and even old imperial sizes.
Replacing the O rings in the combi unit was a bit of a pain - they are quite hard to get at but a small screwdriver eventually aided removal.
Hope my experiences may be helpful... I shall let you know how the replacement goes. If anyone has details of exactly how the clamp rings should be refitted I would appreciate it - failing that I have a 50/50 chance of getting it right...... by the way - what are they for?
I have posted some pics at farmer boy if anyone is interested.
The new cushions were done by a nice chap in Stockport UK for £275 including new high density foam!!!! a bargain!
You will also see that I am struggling to remove the last bit of antifoul. I used caustic soda to remove all of the outer layers but the final base layer will not budge!! I may sand it and use a few layers of primicon... its a pity because I wanted to apply a layer of 'anti osmosis" stuff - Gelshield or similar but I am told ALL antifoul has to be removed.. this stuff will not come off withount hours of hard scarping so I may have to forget the Gelshield route!
Anyway - back to work!
John
Removal.
I had first bought a kit containing the various oil seals, O rings and bearing from Steve Birch and proceeded to follow his instruction sheet.
The instructions are very good and most things went according to plan. Couple of things....
Item 13 says to rotate the flywheel to undo the clamp nut. When I did this the flywheel nut came undone instead! I ended up having to tighten the flywheel nut quite a lot and then trying again as instructed. Worked fine the second time.
Item 14 says use "fulsome" blows on the end of the prop boss - I had to look up what "fulsome" means then gave it a smart crack with a wooden mallet - worked a treat!
Item 16 - removing the key and clamp rings - BE CAREFUL! I managed to drop one of the clamp rings and I am now unsure which way round it goes on re-fitting!!!! If anyone knows please advise!
Steve supplies a few extra seals and O rings - I could not work out were they all fitted until I rang him and he said they were just extras!
The only real issue was removal of a large oil seal at the rear of the engine (size 65mm int, 100 ext, 10 width).... it is quite far in and took a bit of messing with a screwdriver to get it out. I was worried about damaging the housing but when I got the correct angle on the screwdriver it levered out quite easily.... BE CAREFUL when fitting the new one - I managed to get the lip of the seal to roll over on itself and I had to take it out again and damaged it in the process! I would normally use the old seal to push in the new one square but you can't get at it! Any tips on a "safe " way to insert the new replacement when it arrives? (all the seals are standard sizes and are widely available....the smaller ones are 22mm, 40 mm, 7mm, and 24mm 35mm, 7 mm...)
The prop shaft came out easily and the stern bearing was badly worn... maybe 2mm +so I have asked Steve to send me a new Vesconite replacement ( I think he used to use Nyoil but Vesconite is apparently better in a submerged environment) The stern gland, with its own little oil reservoir, seemed in good order but I shall replace the seals and white metal bearings anyway.
The control tube had been replaced recently ( I found the old one in the boat). The old one showed VERY bad wear in the area of the stern bearing... loads of metal had worn away from the shaft ... not sure how this could happen because the housing has a tufnol? bush... weird. Anyway the new one is fine.
A good place for seals and bearings is Simply Bearings Ltd ~ Oil Seals SKF FAG TIMKEN KOYO NTN NKE TRULOC Needle Rollers Taper Rollers Rod Ends Oil Filled Bushes Loose Balls O Rings Grease Plain Thrust.... they have a wide selection and even old imperial sizes.
Replacing the O rings in the combi unit was a bit of a pain - they are quite hard to get at but a small screwdriver eventually aided removal.
Hope my experiences may be helpful... I shall let you know how the replacement goes. If anyone has details of exactly how the clamp rings should be refitted I would appreciate it - failing that I have a 50/50 chance of getting it right...... by the way - what are they for?
I have posted some pics at farmer boy if anyone is interested.
The new cushions were done by a nice chap in Stockport UK for £275 including new high density foam!!!! a bargain!
You will also see that I am struggling to remove the last bit of antifoul. I used caustic soda to remove all of the outer layers but the final base layer will not budge!! I may sand it and use a few layers of primicon... its a pity because I wanted to apply a layer of 'anti osmosis" stuff - Gelshield or similar but I am told ALL antifoul has to be removed.. this stuff will not come off withount hours of hard scarping so I may have to forget the Gelshield route!
Anyway - back to work!
John