Where it is essential that a nut should remain fastened when subject to vibration, it should be (a) secured with a spring washer OR (b) secured with a locking tab OR (c) be secured with locktite or punching/hammering the threads OR (d) be a nyloc nut.
So...... How come wheel nuts are just done up tight? Why bother with locking devices on other nuts?
Discuss........
Locking (spring) washers
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linearaudio
Far more frictional area exists on the tapered surface of a wheel nut. By the time you take into account thread lead-in and corner chamfers on an ordinary nut there's not a lot of mating contact left!! (old Whitworth maybe not so bad as they sometimes had less/no corner chamfer on the contact side, and bigger chamfer on the outward side, thus making them theoretically non-reversible.)
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Alec
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Hello Andrew,
I think I would rather use them than not. I know that some are better than others, the ones with the slant cut seem to dig into the head of the bolt when you undo it. I did have a car once that had all the sump bolts wire locked (about 30 of them) that was quite a lengthy task to do (And yes I do have wire locking pliers)
Alec
I think I would rather use them than not. I know that some are better than others, the ones with the slant cut seem to dig into the head of the bolt when you undo it. I did have a car once that had all the sump bolts wire locked (about 30 of them) that was quite a lengthy task to do (And yes I do have wire locking pliers)
Alec
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Pyoor_Kate
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It is interesting, the MZ uses almost no spring/locking washers - virtually everything that needs to stay put on an MZ does so through a process of being 'done up very tight'*.
That doesn't stop me using Nyloc or Spring washers on the minor, and tbh, I put Nyloc on the seat on the MZ, because they kept shaking themselves off
(*The clutch is on a taped shaft and all that holds it there is doing it up tight, and friction!)
That doesn't stop me using Nyloc or Spring washers on the minor, and tbh, I put Nyloc on the seat on the MZ, because they kept shaking themselves off
(*The clutch is on a taped shaft and all that holds it there is doing it up tight, and friction!)
Pyoor Kate
The Electric Minor Project
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1969 Morris 'thou, 4 Door. 2010 Mitsubishi iMiEV. 1920s BSA Pushbike. 1930s Raleigh pushbike.
The Ex-Fleet:
1974 & 1975 Daf 44s, 1975 Enfield 8000 EV, 1989 Yugo 45, 1981 Golf Mk1, 1971 Vauxhall Viva, 1989 MZ ETZ 125, 1989 Volvo Vario 340, 1990, 1996 & 1997 MZ/Kanuni ETZ 251s
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The Electric Minor Project
The Current Fleet:
1969 Morris 'thou, 4 Door. 2010 Mitsubishi iMiEV. 1920s BSA Pushbike. 1930s Raleigh pushbike.
The Ex-Fleet:
1974 & 1975 Daf 44s, 1975 Enfield 8000 EV, 1989 Yugo 45, 1981 Golf Mk1, 1971 Vauxhall Viva, 1989 MZ ETZ 125, 1989 Volvo Vario 340, 1990, 1996 & 1997 MZ/Kanuni ETZ 251s
Desires:
Trabant 601, Tatra T603, Series II Landy, Moskvitch-401, Vincent HRD Black Shadow, Huge garage, Job in Washington State.
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10852sm
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Many modern engines have no keyways on crankshafts or camshafts and rely on the nut holding the pulley in position, some engines use diamond covered washers to give more grip for a given clamp load where high "stab" loads are present because of very severe cam profiles but most normal production engines just rely on the clamp load from the nut, no nylock or spring washer in sight.
Some engines use a keyway on the crank but the slot in the pulley is twice as wide as the key, this gives the engine assembly operator a rough guide for assembly then when the timing is accuratley set it will be somewhere in the middle and held by the clamp load of the nut, on final tightening the key will actualy do nothing. PSA/Ford/Volvo DW10 engine is an example.
Modern electric nut runners which can tighten a bolt/nut to an accurate torque or a torque and angle and high quality consistent materials mean that spring washers or nylocks are not needed on modern engines, the closest is some exhaust manifold nuts which are squashed across the thread before they are fitted and some bolts which have a pre-applied thread locking compound although on a normal engine this will only be the flywheel bolts.
On a different tack, modern sealants/glues are quite capable of sticking an oilpan on an engine with no fixings, no manufacturere has dared do it yet though!
Steve
Some engines use a keyway on the crank but the slot in the pulley is twice as wide as the key, this gives the engine assembly operator a rough guide for assembly then when the timing is accuratley set it will be somewhere in the middle and held by the clamp load of the nut, on final tightening the key will actualy do nothing. PSA/Ford/Volvo DW10 engine is an example.
Modern electric nut runners which can tighten a bolt/nut to an accurate torque or a torque and angle and high quality consistent materials mean that spring washers or nylocks are not needed on modern engines, the closest is some exhaust manifold nuts which are squashed across the thread before they are fitted and some bolts which have a pre-applied thread locking compound although on a normal engine this will only be the flywheel bolts.
On a different tack, modern sealants/glues are quite capable of sticking an oilpan on an engine with no fixings, no manufacturere has dared do it yet though!
Steve
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Dean
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During my days studying for an engineering degree, I read that the wings on most passenger aeroplanes are glued on. The glue is so strong, it is actually stronger than a nut and bolt but, for aesthetic purposes they also rivet them. The only reason they rivet them is the general public won't accept glued wings as a safe method of attachment and would probably refuse to get on a plane that had glued on wings!!!
My Minor:
A Clarendon Grey 1953 4 Door Series II.
MMOC - 66535
A Clarendon Grey 1953 4 Door Series II.
MMOC - 66535
Dean wrote:During my days studying for an engineering degree, I read that the wings on most passenger aeroplanes are glued on. The glue is so strong, it is actually stronger than a nut and bolt but, for aesthetic purposes they also rivet them. The only reason they rivet them is the general public won't accept glued wings as a safe method of attachment and would probably refuse to get on a plane that had glued on wings!!!
Known as "chicken rivets"