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Pierre Servais Registered User
Joined: 15 Jun 2009 Posts: 3
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Posted: Thu Oct 01, 2009 5:39 pm Post subject: Phase one rear axle |
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Hi everybody,
The rear axle of the "ex-Patrice Wattine Olympic" I own is very noisy.
I would like to rebuild it. But I think isn't a MOWOG (Wolsley, A40, Minor, Sprite...) but from another manufactor. Could be a Ford rear axle adapted to suite Rochdale links, Panhard...
- the Mowog of the A40 of Richard Postins race car I saw last WE at Francorchamps is stamped MOWOG on the top of the nose and has 3 renforced wings on its both side + a oil bolt filler on the right side.
- mine has no oil bolt filler at this place, but one at the rear. There is only 2 renforced wings on both side.
I think it could be a Ford axle (Anglia, Cortina ???).
What do you think ? Because I would like to order internal parts to rebuilt it. Thanks for your help.
Pierre. |
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Rodsmith Registered User
Joined: 16 Jun 2008 Posts: 187 Location: Pembrokeshire, West Wales
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Posted: Thu Oct 01, 2009 7:16 pm Post subject: |
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Hi Pierre- tomorrow I will photograph a Ford/ Olympic axle and a Ford differential for you. These will be Escort parts. I will photograph a Mk1 Cortina diff for you as well.
Rod _________________ " Stay lucky " |
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zefarelly Registered User
Joined: 26 Nov 2007 Posts: 91
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Posted: Fri Oct 02, 2009 8:12 am Post subject: |
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Pierre
Its not a Ford diff.
this is . . . http://www.sportingtrials.com/images/the-diff1.jpg
look on the rear suspension thread for pictures of a Ford axle casing ( mine)
als is another PH2 rear axle which is BMC based in the blue car of Calex FR |
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Rodsmith Registered User
Joined: 16 Jun 2008 Posts: 187 Location: Pembrokeshire, West Wales
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Posted: Fri Oct 02, 2009 12:28 pm Post subject: |
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Ford Escort axle
Ford Escort diff- Mk1 cortina is very similar perhaps the same
Riley 1.5 diff
Riley 1.5 axle _________________ " Stay lucky " |
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Rodsmith Registered User
Joined: 16 Jun 2008 Posts: 187 Location: Pembrokeshire, West Wales
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TonyS Registered User
Joined: 17 Jan 2006 Posts: 230 Location: Worcestershire
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Posted: Fri Oct 02, 2009 3:58 pm Post subject: |
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By the position of the filler plug and the angle of the rear brake cylinders I think it is a Wolseley 1500 axle.
STOP THAT WHINING
1st there is no truth in the word that Mr Fords diff is quieter than Mr Morris it is just a case of Final Drive Adjustment, the Ford axle is heavier but a lot stronger. When I bought the Porschdale, Barney told me it was fitted with a Ford Corsair axle and he exchanged the original 3.9:1 diff for a reconditioned 3.54:1 diff but it had 2 more diff units replaced under guarantee before he had a quite one.
If the rear axle is noisy, before dismantling any part, the oil level should be checked, as a low level or unsuitable lubricant may be the cause of the noise. (at this point we could solve the problem short term with the old car dealers trick of thicker oil and sawdust) not tobe recommended) If this is in order, the period when the noise occurs should be noted. Thus if the noise is more pronounced on the overrun there is too much clearance in the gears. Should the noise occur when the engine is pulling the gears are meshing too closely. If the noise is there all the time the diff gear teeth could be worn or the diff bearings/wheel bearings could be worn/braking up.
Ball or taper roller bearings are fitted to the rear axle gearing, not only to reduce friction but also to deal with the various loads which driving stresses impose.
1) Driving torque tends to force the crown wheel and pinion gears apart
2) The end thrust on the pinion tries to separate them in a fore-and-aft direction.
These forces must be absorbed by good bearings suitably fixed and adjusted.
Correct meshing of the crown wheel and pinion is essential if silent and effective power transmission is to be achieved. (This means the contact patch and position of one tooth on the pinion gear with one tooth on the crown wheel). Provision must be made for wear, and therefore means for altering the sideways location of the crown wheel and the fore-and-aft location of the pinion gear shaft and the pre-load on the bearings. In most cases it is uneven wear rather than total wear which is more prone to cause noise. In most diff units two taper roller bearings carry the bevel pinion shaft and similar bearings support the differential assembly in the casing. The advantage of this type of bearing is that it is capable of absorbing both thrust and radial loads. Other systems often employ ball or roller bearings for the pinion shaft with an additional thrust bearing. The best way to check wear or adjustment of the two gears (backlash) the crown wheel should be firmly wedged (not with the handbrake) and the propshaft rocked. About 1/32in movement on the flange coupling will correspond with the correct tooth clearance of 0.006 to 0.010in.
So far it has been assumed that the crown wheel and pinion are straight tooth bevel wheels, however the spiral bevel gear is generally used, this provides a larger tooth contact area and maintains its silence for longer period. Most modern cars have adopted the Hypoid gear which permits the centre line of the pinion to be below that of the crown wheel, the tooth strength is also greater than the spiral bevel, so that a smaller size gear can be used. Its main disadvantage is that the teeth have a considerable sliding action when engaged this generates heat, which means that special lubricants, termed E.P. (excess pressure) must be used.
But a word of warning if you are about to rebuild you diff unit use a full Workshop manual for your type of diff, so you have the correct build procedure, the correct tools and the correct adjustment clearances and bearing pre-load torque settings, and donot forget to check the wheel bearings before removing the diff, many a new diff has been fitted only to find the problem was the wheel bearings
People also askes why Olympics seem to suffer from whining axles and the donor car does not? The answer to this is quite simply that in a rear wheel drive, short wheelbase, low, two seater sports car the rear axle is only 1 to 2 feet behind and below the drivers ears, where in a rear wheel drive 4/5 seater saloon car it can be 4 to 6 feet behind and lower than the drivers ears, also drive a Riley 1.5 or a Ford Cortina on the road without the rear seat in, you can hear the rear axle then.
So the requirements for a quiet Olympic are a well set-up and maintained rear axle and lots of thick sound deadening material in the rear.
Tony _________________ Rochdale Olympic History Archive |
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zefarelly Registered User
Joined: 26 Nov 2007 Posts: 91
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Posted: Sat Oct 03, 2009 6:45 am Post subject: |
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I have all my LSD/Diff units built by Dave Longhurst, he's brilliant, the only noisy Ford diff I've ever had is one I built myself!
I run a 4.7 and pull 8000RPM |
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TonyS Registered User
Joined: 17 Jan 2006 Posts: 230 Location: Worcestershire
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Posted: Tue Nov 03, 2009 9:19 am Post subject: |
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Hi All,
I have been in touch with the past owner who modified this Olympic about the rear axle, reply below.
The back axle on my Olympic was from a Morris Marina; I can't remember if it was the 1.3 or the 1.8.
I'd guess it was the 1.3, it always seemed to be rather low geared.
Regards Tony. _________________ Rochdale Olympic History Archive |
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Rodsmith Registered User
Joined: 16 Jun 2008 Posts: 187 Location: Pembrokeshire, West Wales
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Posted: Tue Nov 03, 2009 5:47 pm Post subject: |
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Was the 1.8 Marina a Salisbury type axle? I am fairly certain that the 3.45 diff from a Midget will fit in that Marina casing on the car.
Rod _________________ " Stay lucky " |
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