Auto Hubs?

[GoonerCarp]

OK, I am new to the 4WD game!

So forgive me if I'm being a bit divvy What do the Auto Free Wheel Hubs do, and what is the benefit of fitting AVM manual lockers.

Sorry if this is really obvious

 

[Guest]

http://www.nissan4x4ownersclub.co.u...ums&file=viewtopic&t=5187&highlight=auto+hubs

http://www.nissan4x4ownersclub.co.u...ums&file=viewtopic&t=5153&highlight=auto+hubs

http://www.nissan4x4ownersclub.co.u...ums&file=viewtopic&t=4685&highlight=auto+hubs

http://www.nissan4x4ownersclub.co.u...ums&file=viewtopic&t=4445&highlight=auto+hubs
Just some of the topics running on auto hubs, will answer in full later if no-one else has but must rush out now sorry.

 

[(RIP) PLANK]

i htink i was the first in the club to switch to AVM's and so have a bit oif experience, but i stil think if it aint broke dont fix it!

AVM's give a really positve feel in 4x4 and no loss of traction when reversing or moving froward again, as autos disengage and re engage snap rings. with manulas it feels like a tractor!

but basically you loose the ability to select 4x4 from the cab which is pretty inconvienient.

if you autos hubs are playing up don't waste money trying to sort them go for AVM's!!

 

[Terranosaurus]

autos disengage and re engage snap rings. with manulas it feels like a tractor!

they don't but I'm not getting to it, bit like veg oil being illegal too.

 

[(RIP) PLANK]

HB i know an exellant therapist who may help you overcome the urge to contradict everything i type -boxing2-

 

[jace]

i have manuals (they came fitted) bit pain in rear but u can leave them engaged and drive truck in 2wd without damage mpg will increase but when u select 4wd no need to get out and get muddy!

 

[Deleted Member]

HB what does my T2 have again?? i didn't need to reverse to come out of low box!!

 

[Deleted Member S]

HB what does my T2 have again?? i didn't need to reverse to come out of low box!!

I'm sure you have the later type Cosmic which are permantly conected, so when you are driving the front diff is alway turning. I've got the free wheel ones & i'm you remember from the other weekend the O/S/F 1 kept sticking & not unlocking :evil: :evil: That reminds me must try a drop of oil in them to see if it'll free them up :roll:

 

[Deleted Member]

Cheers sweety :lol: :lol:

 

[JonathanM]

OK, I am new to the 4WD game!

So forgive me if I'm being a bit divvy What do the Auto Free Wheel Hubs do, and what is the benefit of fitting AVM manual lockers.

Sorry if this is really obvious

Just realised that your original query (what do auto hubs do) might not have been answered clearly.

Any free wheel hub disconnects the hub from the driveshaft (or half shaft on series land rovers).

An auto hub is supposed to remove the need to lock the hub when you engage 4wd, as the action of the driveshaft turning is meant to lock the hub,but downsides are on the Mavrano they can fail due to the snap ring snapping, and when you reverse there is a good chance they will un lock, as the driveshaft motion is reveresed.

A manual hub does the same job, but needs someone to actually lock them.

Advnatages, manual hubs generally don't break, and won't unlock when reversed, but you need to remember to lock them, or leave them locked. The whels won't be driven if 4wd is used with unlocked front hubs. Auto hubs engage on their own, but due to the downsides listed above thye are not always reliable.

A standard hub (aka a dumb hub) doesn't lock or unlock, the driveshafts will turn whenever the wheel turns.

A freewheel hub system is only applicable to a part time 4wd system, and is supposed to remove the front driveshafts & propshaft from ebing turned all of the time, reducing wear & tear and theoretically improving fuel consumption. TBH they will have little effect in practice, except maybe on an old series land rover.

BTW do people with manual hubs need to lock them regularly to ensure oil is splashed around the diff etc, and grease circulates in the CV joints? Series landies with FWH need to have themlocked occasionaly to ensure some splash lubrication of the hub & front diff.

 

[jims-terrano]

"BTW do people with manual hubs need to lock them regularly to ensure oil is splashed around the diff etc, and grease circulates in the CV joints? Series landies with FWH need to have themlocked occasionaly to ensure some splash lubrication of the hub & front diff"

I lock mine once a month or so and do a local trip at around 30mph, don't know if it needs it but I'm a great believer in belt and braces.

When I think I'm likley to need 4wd I lock the hubs, only once being caught out and got muddy shoes :lol:

Jim T

 

[Terranosaurus]

Just to clear up how they work. The so called break/brake rings would be better described as clutch rings, probably lost in translation from japanese.

When there is a difference in rotating speed between the 2 rings the friction they exert on each other causes one to turn the other, this cause the locking part to engage, once it is engaged it will not come disengaged or slip etc until there is once again a difference in rotating speeds and even then only in the opposite direction to that which engaged them in the first place.

Thus if they are engaged and you are still in 4x4 when you reverse they do not magically disengage and then reengage immediately they simply stay engaged, until such a time as you revers whilst not in 4x4, assuming of course that you engaged 4x4 whilst traveling forward.

There has been an awful lot of rubbish talked about these hubs on here over time, such as the break/brake/clutch rings are a weak link - they are not, they do not even transmit any power except to the hub engagement mech for a short time. What breaks them is engaging 4x4 whilst stationary and then setting off anything other than gently as the sudden force applied to them, breaks off the lugs (or even the whole ring in hlf) where the inner one drives the engagement mech. If you dismantle one and look at how it works it is obvious that they cannot slip, there are some great big teeth/dogs in the end of the housing that transmit the power and once locked home these do not come out.

For me the advantage of manual hubs is the cost and the fit and forget nature, autos do were out their rings or they break if you are rough with them and they really should be regreased fairly regularly, am wondering if I could fit a grease nipple somewhere. The manuals are almost as cheap as replacing just the rigs let alone the whole assembly. If I ever get to the point where mine are knackered again I'm going to fit solid drive flanges off a late model terrano.

 

[(RIP) PLANK]

arent you just glad Hummingbird is here to put us all straight!!! not!!

 

[jace]

ladies ladies itll be handbags at dawn next lol

 

[(RIP) PLANK]

well Jace i see your point, but would you agree that the great thing about forums / clubs like this is the wide range of experience and opinions and being able to join in a free ranging discussion on a subject of your chice, not to be pedantically and rudely criticised on everyhting you post!

You dont have to agree with everything a person says but there are better ways of putting things than suggestind everyone is talking rubish or wrong, particularly when the person saying it talks as much rubbish as anyone and is just as often wrong!

anyway Jace my rant over for today, and cheers for the link!

 

[mav]

Ok, I do understand that the forums are open for opinions of all types and i do agree that saying that there is a lot of rubbish spoken on here is Hummingbirds opinion and is one that i do not agree with as members i am sure would prefer not to comment if they thought what they were about to say was incorrect.

Steady up Please,

There is always the PM option.

Mav.

 

[Paul]

Abit off topic, but anyone know how much / where we can get hold of a set of AVM manual lockers.

Paul.

 

[jims-terrano]

milner Off Road, last time I looked they were about 55 quid plus VAT. Dead easy to fit with Planks Workshop too.

Jim T

 

[Paul]

milner Off Road, last time I looked they were about 55 quid plus VAT. Dead easy to fit with Planks Workshop too.

Jim T

Thanks, fitted aset to our old series one Landrover many many years ago(God I feel old now) 8)

 

[Terranosaurus]

i do agree that saying that there is a lot of rubbish spoken on here is Hummingbirds opinion

I didn't say that a lot of rubbish was spoken on hear but that a lot of rubbish has been spoken on here about auto free wheeling hubs - how long were people calling the brake rings break rings for instance.

I thought one of the main reasons people came on here was to find out information about their trucks - in future I won't bother and will simply allow the myth and fiction to be perpetuated.