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BigJimnyMeet (North) 2024 (12 Jan 2024)
BigJimnyMeet 2024
14th July 2024
Parkwood Nr. Leeds
14th July 2024
Parkwood Nr. Leeds
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Suppliers/Dealers or anyone selling with a commercial view in mind CANNOT post here unless responding to a specific request of a member in a "wanted" post.
Suppliers include people "breaking for spares" on a regular basis, when purchasing spares members should ask a supplier what they contribute to the running of the forum particularly if contacted by a Private Message
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Strange FWD Problem
- blake
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13 Sep 2020 19:40 #228153
by blake
Strange FWD Problem was created by blake
Hi everyone i'm a newbie on here looking for any help in what I think is a unique problem with the 4WD system I will try and explain this problem we are having here goes, first of all i'm very conversant with the system, secondly the 4WD drive system works perfectly however the problem is when in 2WD and at random the L/H front hub tries to engage, sometimes this noise of the gear trying to engage with shaft lasts for a few seconds where it will engage and other times you have to stop and engage 4WD and then disengage to carry on.
There's a lot been done here already to eliminate most obvious things, both front hubs were removed and refurbished with new seals and bearings, new vacuum pipes both rubber and steel new vacuum tank fitted, so the obvious thing that's happening here is that somehow the 4WD system is being activated at random while in 2WD that being puzzling enough but what is really baffling is why the L/H hub that rattles never the R/H which it should be the first hub to engage because it has the shortest pipes as when you select 4WD and listin for the hubs to click it's R/H first then a second latter the L/H clicks in, so why is it in this bizarre fault on the road the left hub tries to engage never the right, we have swapped hubs and I have tried running with the pipes off the left and the problem never occurs with the pipes off which would confirm there is nothing mechcanly wrong, any help would be greatly appreciated on this
Alan
There's a lot been done here already to eliminate most obvious things, both front hubs were removed and refurbished with new seals and bearings, new vacuum pipes both rubber and steel new vacuum tank fitted, so the obvious thing that's happening here is that somehow the 4WD system is being activated at random while in 2WD that being puzzling enough but what is really baffling is why the L/H hub that rattles never the R/H which it should be the first hub to engage because it has the shortest pipes as when you select 4WD and listin for the hubs to click it's R/H first then a second latter the L/H clicks in, so why is it in this bizarre fault on the road the left hub tries to engage never the right, we have swapped hubs and I have tried running with the pipes off the left and the problem never occurs with the pipes off which would confirm there is nothing mechcanly wrong, any help would be greatly appreciated on this
Alan
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13 Sep 2020 20:07 #228154
by RainerK
Replied by RainerK on topic Strange FWD Problem
This sounds very mysterious!! Could it that what you hear is not the hub engaging but something else?
I would test this by stopping when I hear the engaging, turning off the motor, lifting the wheel with a jack and the turning it by hand. If engaged, then the prop shaft could also turn or you could feel that the shaft also turns and if you cannot turn it, then also the other wheel and the transfer box are engaged. And if the wheel spins freely, then the noise is something else.
Depending on the result, I would think about the next steps.
I would test this by stopping when I hear the engaging, turning off the motor, lifting the wheel with a jack and the turning it by hand. If engaged, then the prop shaft could also turn or you could feel that the shaft also turns and if you cannot turn it, then also the other wheel and the transfer box are engaged. And if the wheel spins freely, then the noise is something else.
Depending on the result, I would think about the next steps.
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13 Sep 2020 20:11 #228155
by Velocette
Replied by Velocette on topic Strange FWD Problem
Have you checked the magnet which retains the 4wd engaging collar inside the hub assembly. It may be damaged and unable to hold the collar retracted. Its the ring in no.3,
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- blake
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13 Sep 2020 21:36 #228158
by blake
Replied by blake on topic Strange FWD Problem
Done better than that when it happened I was ready with my 8mm socket and removed the hub assembly at the side of the road to confirm it was indeed in the engaged position, also the hub was replaced as a precaution and even swapped side for side and still the fault remains, dam mystory
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- blake
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13 Sep 2020 21:39 #228159
by blake
Replied by blake on topic Strange FWD Problem
O yes I have and the drive hub has been replaced with a S/H one and when the appeared again I then swapped from side to side remembering that the R/H side never tries to engage
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14 Sep 2020 05:00 #228162
by Lambert
Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!
Replied by Lambert on topic Strange FWD Problem
Have you cleaned and checked the condition of the vacuum solenoids and their wiring?
Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!
The topic has been locked.
14 Sep 2020 06:06 #228167
by RainerK
Replied by RainerK on topic Strange FWD Problem
Hello, this was quick reply!!
So you checked and found out that one wheel hub was actually engaged.
Did you find out if the gearbox was engaged too or do you have a manual gearbox?
So the next thing I would try to find out is if it is vacuum issue or not.
The easiest way to do this would be to disconnect and plug the LH vacuum lines and check if the hub randomly engages or not. After this it should be obvious if you have to start exchanging parts in the vacuum system or in the LH hub.
Another question: When you said that you exchanged the hubs, what exactly did you exchange? (The answer would only be relevant if it still switches with the vacuum lines disconnected.)
So you checked and found out that one wheel hub was actually engaged.
Did you find out if the gearbox was engaged too or do you have a manual gearbox?
So the next thing I would try to find out is if it is vacuum issue or not.
The easiest way to do this would be to disconnect and plug the LH vacuum lines and check if the hub randomly engages or not. After this it should be obvious if you have to start exchanging parts in the vacuum system or in the LH hub.
Another question: When you said that you exchanged the hubs, what exactly did you exchange? (The answer would only be relevant if it still switches with the vacuum lines disconnected.)
The topic has been locked.
14 Sep 2020 06:45 #228168
by mlines
Martin
2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
Replied by mlines on topic Re:Strange FWD Problem
Whilst the vacuum is used to move the locking ring, magnets are used to hold the ring in place. If the hub has not properly disengaged it is conceivable that the magnets pull the ring back to the locked position after a time. Check you have only a very thin amount of grease, not to much. Too much grease or thick grease will stop the ring moving properly.
Sent from my Pixel 2 XL using Tapatalk
Sent from my Pixel 2 XL using Tapatalk
Martin
2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
The topic has been locked.
- blake
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14 Sep 2020 07:00 #228169
by blake
Replied by blake on topic Strange FWD Problem
Yes all been checked and cleaned, remember what I said the 4WD system works PERFECTLY every time when called upon
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- blake
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14 Sep 2020 07:53 #228173
by blake
Replied by blake on topic Strange FWD Problem
It's a switch system and works PERFECTLY every time difficult to tell if the gearbox has actually engaged 4WD as when the fault happens you stop the vehicle Jack up the left wheel and you can tell that it has engaged the hub Jack up the right wheel and it's free wheeling so if the gearbox was in 4WD it still wouldn't drive.
Remove the hub to confirm it has indeed engaged then physically load the spline against the magnet refit hub and the same fault will occur sometimes within a mile or it could be 20 miles but it will happen.
It does not happen if you pull the pipes off confirming that there's nothing wrong with the hub
Remove the hub to confirm it has indeed engaged then physically load the spline against the magnet refit hub and the same fault will occur sometimes within a mile or it could be 20 miles but it will happen.
It does not happen if you pull the pipes off confirming that there's nothing wrong with the hub
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14 Sep 2020 08:26 #228174
by mlines
Martin
2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
Replied by mlines on topic Re:Strange FWD Problem
We do note you say is working perfectly, but then you also say it has a problem. That's why we are offering advice
Sent from my Pixel 2 XL using Tapatalk
Sent from my Pixel 2 XL using Tapatalk
Martin
2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
The topic has been locked.
14 Sep 2020 08:57 #228178
by mlines
Martin
2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
Replied by mlines on topic Re:Strange FWD Problem
For what its worth, I think Lambert is on the correct path. A leaky vacuum valve
Martin
2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
The following user(s) said Thank You: Lambert
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