speedo

[PSL184]

I explained it earlier in this thread

[cadetchris]

indeed you did, but my skills of counting wheel rotations and propshaft rotations is limited slightly.
so ideally if some thing was stamped on it and roughly what i would say (so i know what i am looking for) would be of benefit

[PSL184]

The only way to be 100% certain if you don't want to count the turns is to pull the diff and look at the crownwheel. This is a 3.9 diff

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[cadetchris]

fudge, looks like i am counting wheel rotations.
so to get this stright,
turn the rear road wheel 10 times, whilst counting the drive shaft rotation. divide by 10 and then that by 2, thus equalling the ratio.
if its not a wolseley 1500 diff, and i was sold it as a 1500 diff and it wasnt fitted by me, but by garage, whom do i shoot?

[PSL184]

Yes. Mark the road wheel with a piece of chalk or tape so you know where your turn starts and off you go. As for who to shoot would depend on where you bought it from. The garage that fitted it (if they didn't sell it) can't be liable as they only fitted what you provided them to fit....

[mike.perry]

Jack up the car or apply the handbrake slightly so that only one wheel is free to rotate or you will get a false reading.

[cadetchris]

as for where one purchased the diff from a wolseley 1500 specialist, who assured my dad that it was a wolsely 1500 diff. we then gave the diff and the car to a morris minor specialist to fit.
however, it might look like that either the wrong diff was supplied or the wrong diff was fitted, either way i know where their is a wolseley 1500 sitting rotting in a field, and i need the brakes and the engine from it, so it makes sense to liberate the diff from it as well, just to make sure

[billlobban]

I explained it earlier in this thread

OOPS!!! my wife does say I've got a short attention span

[bmcecosse]

Well - the engine is not much use for a Minor (unless planning major mods) - but the front and rear brakes - and diff (and half shafts) are well worth having. Is the engine planned for the Somerset ?

[cadetchris]

was thinking of using the diff anfd half shafts on the moggy and probably the brakes and the engine in the somerset.

[cadetchris]

right, just a wee update,

done the turn the wheel and count the drive shaft and then do abit of maths method and come to a strange number, as below:

turn the wheel 10 times, and count drive shaft rotations, so i ended up with 25 prop shaft rotations to 10 wheel rotations, so using the formula given above,

25 divided by 10 = 2.5

2.5 divided by 2 = 1.25

so logically, you would have a diff with a ratio 1.25.

i am presuming that that is very very wrong indeed. we tried this method of wheel turning and counting 10 times as i was astonished at the very small number, i was expecting late 60's to mid 70's in rotations, not 25.

so, i am now out of ideas, any one else got some?

[bmcecosse]

Multiply - not divide. Allowing for errors - could be 5.3 diff?

[cadetchris]

multiply which bit?

would it be 25 / 10 = 2.5 x 2= 5?
thus 5.3 diff?

SO, if we have a 5.3 diff, what speedo head is required to get an accurate speed displayed?

[mike.perry]

If you had a 5.3(75) diff it would have come from a Series 11 and I think that you would notice the extremely low gearing.
Is the filler plug on the diff or back of the casing or both?

[PSL184]

I think you have not counted correctly....

[cadetchris]

I think you have not counted correctly....

counted 10 times, all 25 rotations of the prop shaft to 10 wheel rotations

[cadetchris]

the filler is on the diff casting, not the axle. as for the gearing, i haven't noticed really as i cannot remember what it was like before the diff was replaced (university got in the way)

[PSL184]

How strange - you did have only 1 wheel off the ground I assume?
It sounds like a 4.55 diff from description

[cadetchris]

yep, had one wheel off the ground and the other on the jack.

its looking like i am going to have to take off the diff and find the stamps just to make absolutely sure what it is. is it just a case of off with the prop shaft, undo the bolts and pull it out?

[bmcecosse]

As well as the 'minor' matter of pulling the half shafts on both sides! Why not just repeat the turning/counting - but this time do it accurately!