Marcus J
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I'd be inclined to agree with you! I think I'd still have to do the difficult bits of turning up some alternative feet for the rear mounts to hold a single large bolt, and making something to go in place of the front bobbins, so even that doesn't seem as simple as it should be!
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Hi Mike, yes the mounts are pretty big on mine too. It's the flexible coupling that is from an early mini driveshaft, well, the inner rubber spider is, Moss still sell them and do an uprated nylon one, but I'm going to have to get rid of mine as I'm worried that it might not be aligned with itself anymore, and the split half clamp that I now need for my prop (due to the worn keyway) is a bit longer than the old one, and so I don't have the room for the 4" long mini coupling. I'll come back to that after Wednesday though! The new, very boring normal modern mounts arrive tomorrow.. if I don't report back assume the worst; I've lost a hand trying to angle grind off that inaccessible engine bearer!
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Well, I'm getting through the layers of grime, and I think you're right Tony, the bush definitely seems to have extruded out of the casing. It's all looking a bit like I'm going to have to face facts. With this in mind i've bought the smallest angle grinder i could find in order to chop away at the inaccessible bearer, ready to accept some standard modern mounts with a new foot turned up to accept the stud through the bell housing. As for the mini coupling, I think it's the same sort of situation, I've bought an R and D split half coupling that seems to have clamped on centrally, even though my keyway on the propshaft is more of a vague valley than a gorge. ( I can't change the propshaft until i can move the boat eh?!) then it's going to be a new flexi coupling and a trip to a friend to get a large chunk of stainless turned up as an adapter between that and the odd sized gearbox flange...
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Thanks so much for all that Tony, it's all a great help. Funnily enough I found that website last night and was wondering about the cone mounts too, but trying to mount them to the engine foot as in the original system, upside down. I haven't had time to figure it out but I feel that that way or your way might work. They certainly seem low enough if it's just that part above the flange, though I think I thought they had too great a diameter. Your method would solve that as there's much more room on the turret than the foot. Whilst I'm a boatbuilder, it's mostly with wood and sorting engine mounts for me is usually a matter of fitting what the engine manufacturer says, rather than calculating thrust loads and so on, so it's good to know that maybe it's not such a crazy idea. I can see what you're saying about the bobbin mounts, it certainly seems as though they wouldn't be taking much of the fore and aft thrust, and so whatever I do is going to have to take that into account. The same website also has H mounts which i was thinking could be mounted into the turrets, but I think they would then need new inner bushes turned that had a flange to sit on the rubber, which brought me back to the original top hats... I wonder if it would be possible to simply buy a fairly standard rubber bush with an inner steel sleeve and put it in the old hats? If the outer hat needed renewing then they could be turned up, but in practice, all they are doing is containing the bush and putting the weight of the engine on the upper outer edge of the inner bush... I think?! The bottom part of the bush then sitting on the turret, or, as you rightly say about mine... many washers! If I could find the right standard bush this might solve the supply problem, depending on how hard it is to get the rubber out of the old hats of course! Until I get the old ones out though, I'm not entirely sure that could possibly work, they could well also be cones of rubber inside i suppose... which would rather scupper my thinking. Marcus
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Ah Richard! Well, If you do find some I'd be a very willing customer! The forward mounts and part of the shaft coupling have arrived so I'm going to set to work with those on Friday, and wiggle one of the rear ones out whilst I'm at it to see what can be done. If you manage to find some before I start drawing up dimensions and calculating rubber densities I'd be a most happy boaty. Marcus
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Ah, thanks, but the last photo is of the one i can find. ASAP still sell them. The other ones are odd I admit, they're a metal housing with the rubber inside, through which goes the bolt in another steel bush. I can't really get a better photo at the moment without taking them out I'm afraid, and my phone lens is very full of sawdust and so not very clear at the moment! Another thing to fix, but that isn't quite as important...
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Oo! Thats a possibility I hadn't thought of CT thanks! I could just run a piece of steel across both bearers to extend the beds and work from there... I've just found a company called av industrial who seem to supply asap with the bobbin mounts, and have some turret mounts that would maybe work, but it would be quite a lot of modifying to get them to fit, and they might want an industrial sized order to get the correct rubber in there.
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Hmm, yes I was wondering about that but I've only got 20mm underneath the feet, so even if i do that I'd have to take the engine and the calorifier all the way out to chop down the engine beds as I don't seem to be able to find any modern ones that low... Marcus
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Hi all! So, I really hope one of you out there might know where I could find some of these old engine mounts. They are the metalastic top hat type with three bolts that screw into the bell housing. I've seen that there are some really useful previous threads on here that have exactly the same set up as me with these rear mounts, the bobbin forward ones and the 4" coupling from a mini driveshaft. Unfortunately ASAP and Calcutt don't have them any more and, am I right in saying that Thornycroft don't exist now? Their website doesn't seem to anyway and it's been a long time since I've seen a yellow pages. My mounts are very dead and that has killed the shaft coupling, which I also can't find as it has a register of 85mm, and everything now seems to be 2.5" I think I can solve all of this with a new 5" OD shaft coupling, flexi coupling and then getting an adapter bobbin turned up to go from that to my gearbox flange, which is 5.5" and also has a strange 85mm register. But... unless I can find some engine mounts none of it means anything. Please, any suggestions would be greatly appreciated. Do I try to get a mount turned up? or just mount it solidly? It's a pretty smooth engine after all. The old mounts have a lovely dusting of metal around them so I think any hope of re-using them has been put out of my mind. Many thanks in advance... now I'll try to add some pictures...
