mozz smith

mozz smith

Well-Known Member
hi wammers just a query and also an update,, my original problem began with the pump coming on quite irregular fo 30 secs at a time and sometimes longer , so as you know tried to change filter , backplate knackered so went to change it and snapped a bolt , sorted bolt out put all back together with new end plate and gasket and new filter ,,,,,,reconnected everything also did the finger test ?? then all complete ,took it for a spin suspension all square and at 47" from centre of hub to top of wheel arch and rises and lowers no problem ,,, BUT the pump is still coming on very regular and runs for same amount of time 30 secs and sometimes longer so ???? is the pump ****ed or the commpressor ????????? all the airbags are fine i.e. water test and no air leaks ,,,, whats your opion matey ???? thanks for all your help so-far cheers wammers kind regards MOZZ p.s. the motor is a 2000 thor v8 with 90k and been well serviced and looked after :)
 
When the pump/compressor comes on every 30 seconds, is that with the bonnet open? If so my year 2000 does that, shut the bonnet and it stops. Never found out why, never caused me a problem as it functions correctly with the bonnet shut.
 
hi keith . its with the bonnett closed matey this has only been all put back today so will check out in morning see if its still doing it maybe a good blast up motorway may see it settle down ????? cheers keith as i was worried that the pump may burn out ???? cheers MOZZ
 
mozz smith said:
hi keith . its with the bonnett closed matey this has only been all put back today so will check out in morning see if its still doing it maybe a good blast up motorway may see it settle down ????? cheers keith as i was worried that the pump may burn out ???? cheers MOZZ
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If it's doing it with the bonnet closed, then you either have a leak in the storage side to the tank, a problem in the valve block,(Wammers knows more about the valve block than I do) or the pressure switch is on the blink.
 
cheers keith i will wait and see what wammers has to say and then decide where im going next , cheers for your imput ,MOZZ
 
Right i have been through this on another thread but i will tell you what i think. Firstly it could be a leak in storage side of system, that is between NRV1 and tank. The link to the tank from the valve block is the violet coded 6mm pipe. However it would need to be a fair leak to drop the pressure switch from 140 to 120, it's cutting in value, in a few seconds. I had the same thing Data did, but in my case you can't hear the pump running with bonnet shut. Or at least i can't, only noticable with bonnet open and lid off EAS box. Used to run for 10-15 seconds then stop then start after 15-20 seconds. Changing the pressure switch cured this instantly. Reason is i think that pressure switch is not a simple on off unit. It works i think on resistance. So off is 140 psi +- 7. On is 120 psi +- 7. So on could be anything from 113 psi to 127 psi. Off could be anything from 133 psi to 147 psi. So depending on whether the switch is giving the correct resistance at either end of it's range. You could have an on/off differential of 34 psi or just 6 psi. If it was 6 psi it would not take much of a leak or a bit of usage to make the pump constantly cycle. As i say i sorted mine by changing the switch it does not constantly cycle any longer. So draw your own conclusions.
 
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wow you know your stuff im now tatally baffled with all the psi differences so tell me where and how to swap the pressure switch plus where i get one from ? and ill do just that and change it and report back to you with the result , you'r well up on this ,do you want a new neighbour ???????????? ha ha ha ,,kind regards wammy cheers MOZZ
 
wammers said:
Right i have been through this on another thread but i will tell you what i think. Firstly it could be a leak in storage side of system, that is between NRV1 and tank. The link to the tank from the valve block is the violet coded 6mm pipe. However it would need to be a fair leak to drop the pressure switch from 140 to 120, it's cutting in value, in a few seconds. I had the same thing Data did, but in my case you can't hear the pump running with bonnet shut. Or at least i can't, only noticable with bonnet open and lid off EAS box. Used to run for 10-15 seconds then stop then start after 15-20 seconds. Changing the pressure switch cured this instantly. Reason is i think that pressure switch is not a simple on off unit. It works i think on resistance. So off is 140 psi +- 7. On is 120 psi +- 7. So on could be anything from 113 psi to 127 psi. Off could be anything from 133 psi to 147 psi. So depending on whether the switch is giving the correct resistance at either end of it's range. You could have an on/off differential of 34 psi or just 6 psi. If it was 6 psi it would not take much of a leak or a bit of usage to make the pump constantly cycle. As i say i sorted mine by changing the switch it does not constantly cycle any longer. So draw your own conclusions.
Click to expand...

I've got a couple of spare valve blocks, I'll hike a pressure switch out over the weekend and test it to see if it is a simple switch or an analogue resistive output.
My version of RAVE gives slightly different pressure figures, cut in 104 to 116psi, cut out 138 to 152psi giving a worst case differential of 22psi or best case 48psi. It's makes no difference to Wammers statement above though.
 
Datatek said:
I've got a couple of spare valve blocks, I'll hike a pressure switch out over the weekend and test it to see if it is a simple switch or an analogue resistive output.
My version of RAVE gives slightly different pressure figures, cut in 104 to 116psi, cut out 138 to 152psi giving a worst case differential of 22psi or best case 48psi. It's makes no difference to Wammers statement above though.
Click to expand...

I have one somewhere i was going to test but can't find it. Only thing i am going on for resistive is. Rave Says compressor is activated when the pressure switch senses a falling pressure below 120 psi +-7. Yes mine says the same under front air suspension description. But if you look at diagram of switch it indicates. Open circuit 120 psi closed 140 psi. Think to be honest, if you look through it, there are several differeing descriptions.
 
wammers said:
I have one somewhere i was going to test but can't find it. Only thing i am going on for resistive is. Rave Says compressor is activated when the pressure switch senses a falling pressure below 120 psi +-7. Yes mine says the same under front air suspension description. But if you look at diagram of switch it indicates. Open circuit 120 psi closed 140 psi. Think to be honest, if you look through it, there are several differeing descriptions.
Click to expand...
Probably true, as long as it gets to 120psi it makes no odds.
I'll let you know about the switch:)
 
cheers i cant ask for more , imho the best two imformative chappies on here ,, many thanks wammers and keith ,,kind regards MOZZ
 
Well my workshop compressor is not man enough to operate the pressure switch. What I can tell you is that at 110psi the pressure switch reads open circuit, this means that the compressor could be called by a bad connection. I will have to rig up a P38 compressor and see if I can get the switch to operate and find out if it's an on/off switch or an analogue transistion.
 
mozz smith said:
hi wammers just a query and also an update,, my original problem began with the pump coming on quite irregular fo 30 secs at a time and sometimes longer , so as you know tried to change filter , backplate knackered so went to change it and snapped a bolt , sorted bolt out put all back together with new end plate and gasket and new filter ,,,,,,reconnected everything also did the finger test ?? then all complete ,took it for a spin suspension all square and at 47" from centre of hub to top of wheel arch and rises and lowers no problem ,,, BUT the pump is still coming on very regular and runs for same amount of time 30 secs and sometimes longer so ???? is the pump ****ed or the commpressor ????????? all the airbags are fine i.e. water test and no air leaks ,,,, whats your opion matey ???? thanks for all your help so-far cheers wammers kind regards MOZZ p.s. the motor is a 2000 thor v8 with 90k and been well serviced and looked after :)
Click to expand...

hi wammy , well i think the pumps goosed its virtually on all the time so i need to isolate it ,so where is best ? the pump fuse or unplug it under the cover ? what do you suggest also i need to use the car for a few days till i get a replacement will that be ok ? cheers mozz:confused:
 
mozz smith said:
hi wammy , well i think the pumps goosed its virtually on all the time so i need to isolate it ,so where is best ? the pump fuse or unplug it under the cover ? what do you suggest also i need to use the car for a few days till i get a replacement will that be ok ? cheers mozz:confused:
Click to expand...

You can pull the compressor relay. Is it on the bump stops? It will be bloody uncomfortable to use if it is:eek: New compressor next working day from Island 4 x 4 is your best bet, or fit a set of valves and blow it up with a garage compressor:)
 
mornin keith thanks for your reply . its not on the bump stops its fine as far as thats concerned ,also its not the compressor its the pump ,i have ordered one but wont get it for a couple of days but just need to use it locally for two days , so is there `a independant pump fuse or is all under one ? cheers mozz
 
mozz smith said:
mornin keith thanks for your reply . its not on the bump stops its fine as far as thats concerned ,also its not the compressor its the pump ,i have ordered one but wont get it for a couple of days but just need to use it locally for two days , so is there `a independant pump fuse or is all under one ? cheers mozz
Click to expand...


You talking about the EAS Moz? If so you can call it a pump but it's a compressor. If you are talking about the brake pressure pump don't use it, it may be dangerous:confused:
 
hi keith ,now your confusing me , as per rave ,its the e,a,s, under bonnett right hand side lift cover off and theres a long pump on top of the compressor , attached to blue air pipe , its that wich is running too much frightened it will burn out and cause me more problems ,,its a 2000 v8 thor engined vouge ,,cheers matey
 
mozz smith said:
hi keith ,now your confusing me , as per rave ,its the e,a,s, under bonnett right hand side lift cover off and theres a long pump on top of the compressor , attached to blue air pipe , its that wich is running too much frightened it will burn out and cause me more problems ,,its a 2000 v8 thor engined vouge ,,cheers matey
Click to expand...

That's the compressor mate, the large cylindrical part is electric motor and bit on end is piston and barrel etc.
 
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