spigot bearing

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PTSTEER

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Just replacing my v8 engine on a v8 to series gearbox & wonder if anyone knows where to purchase a spigot bearing. The old one was a v8 bronze bush machined down to accept a series 1st motion shaft but is extremely thin & unlikely to come out.Im sure i saw somewhere a proper bush mounted on the flywheel bolts but am unable to locate it anywhere.Guidence in the right direction would be appreciated:)
 
PTSTEER said:
Just replacing my v8 engine on a v8 to series gearbox & wonder if anyone knows where to purchase a spigot bearing. The old one was a v8 bronze bush machined down to accept a series 1st motion shaft but is extremely thin & unlikely to come out.Im sure i saw somewhere a proper bush mounted on the flywheel bolts but am unable to locate it anywhere.Guidence in the right direction would be appreciated:)
Click to expand...

Whooops !

Take care here.
The bush is just that - a pressed-in phosphor-bronze bush. Is usually just a ram-jam fit in the hole in the back of the crankshaft. It is ONLY running as a bush when the clutch pedal is down and the clutch disengaged. At all other times all the bush does is hold the gearbox input shaft in line with the middle of the crank.

One way of (trying) to get the bush out is to pack the thing full of grease, then find an old pilot shaft (or a metal round bar that's a VERY good close sliding fit), and blast it into the bush with a big hammer. Occasionally this will create enough hydraulic pressure to force the bush out.

It may also spray blobs of grease - wear specs.

If the bush has been thinned you should be able to get it out quite easily.

There are ways ... but you WILL need a new bush, which I think you'll not find hard to get, even if it needs to come from a main stealer

CharlesY
 
The point is its not a main dealer part as its a conversion. while the grease effect works its cos the bush has been machined down then its too thin to work & be knocked back in easily. Im after the replacement bush specially made for this application that im sure i have seen somewhere
 
Hold it!

Didn't you say you were fitting the V8 engine back on to a proper gearbox for a V8 ?

"Just replacing my v8 engine on a v8 to series gearbox" you said.

Is the engine and gearbox not a match?

CharlesY
 
the engine is v8 & the gearbox a series 2 1/4 hence its through an adaptor plate.the bearing is a one off..... im after the special conversion spigot as neither a v8 or series is any good
 
Through further investigation i have found that the way foreward is to have the series 1st motion shaft machined down to fit a standard v8 crank bronze bush.This seems far better than machining the bush down to wafer thin as was previously done in my setup by a previous owner. Abit more extra work removing the shaft from the gearbox but by far a better engineered solution
 
PTSTEER said:
Through further investigation i have found that the way forward is to have the series 1st motion shaft machined down to fit a standard v8 crank bronze bush.This seems far better than machining the bush down to wafer thin as was previously done in my setup by a previous owner. A bit more extra work removing the shaft from the gearbox but by far a better engineered solution
Click to expand...

Hmmmm...... I'm not sure that's a risk-free solution.

Being a hardened steel shaft, it will have been surface hardened where it was intended to run in the bush, and machining it down will (a) be rather tricky because the surface will be VERY hard, and (b) if you do get it machined (or ground) down the hard surface will have been removed, allowing wear to occur, and possibly even causing the spigot end of the shaft to snap off.

If the end comes off the shaft you've got a really big disaster just about to happen in your clutch, and maybe also in your gearbox.

Seek advice from someone who has already overcome the conversion.

CharlesY
 
I have sought advice & they reckon the shaft isnt hardened steel, & they have it on a web site as thats the way to do the conversion. There doesnt seem to be anyone on here who has actually done it as responces are not exactly forth coming.Logically there are only two ways......machine the bush or get a special one off or machine the 1st motion shaft. the machined bush really is thin so not sure thats the way to go.......so was looking for a one off special but to no avail so fer & do like the maching of the shaft as a good solution just the question of whether it is actually hardened steel or not.Apperently not says bob:)
 
Believe it - it's going to be pretty damn tough.

My guess it will be made of something like EN 40 steel, because it's one piece of steel with the input gear on the blunt end of it, and the clutch drive splines just behind the spigot bearing at the sharp end.

Have you found anyone who has ACTUALLY DONE IT, or are you in discussions with "experts"?

I urge some caution, but then, there are lots of input shafts about, cheap.

Why not locate one, and try it, so you don't wreck yours by experimenting?

CharlesY
 
There used to be a firm called Milner Conversions,but i do beleive they are now trading under another name.(try 01629 734411 their old phone number)
I seem to remember I used a 91/2 clutch and all necesssary bits etc came with it.
Hope it helps somewhat.
 
thats the problem i have.... i have the converted engine brackets conversion plate, drilled flywheel,smaller clutch, remote filter, the only bit im trying to improve is the spigot adaption as the old one is somewhat poor. I think machining is the way as they machined it to begin with & it will still be as thick as the range rover & thicker than an SD1 so now i just need to get on with it
 
PTSTEER said:
well "Bob" says its the way to do it..... http://www.bobuilt.co.uk/conversions/v811htm & while it may seem hard there is only one way to find out.....after all if it doesnt work then ive only got to get another shaft & still held up as there are no other solutions to hand at the moment
Click to expand...

Better by far to get the spare shaft first, and experiment on it.
Even if it was a shaft with a jiggered gear or synchro dogs.
It would act as a pilot run, and if it was possible, THEN might be the time to do the actual shaft from your gearbox.

Just a thought ...

CharlesY.
 
Im having it done in the machine shop as we speak. Its costing £20 so no need to experiment as its wasted money:) They didnt see any problems in it so full steam ahead.
 
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