P38A Help ! Catastrophic failure -ominous metallic clunking from rear

marjon · Feb 12, 2022

Jon Dor said:
But not on my P38 Keith. Gets to normal ride height ONLY with 85 psi min on fronts, 135-140psi on rears.

Have you got your boat engine in the front with spares in the boot

.
Or you have got some serious tight bushes.

65 was always fine for the P38 when ran on the emergency Schrader's.

J

Jon Dor · Feb 12, 2022

marjon said:
Have you got your boat engine in the front with spares in the boot.
Or you have got some serious tight bushes.

65 was always fine for the P38 when ran on the emergency Schrader's.

J

That's interesting J. The car's usually full of stuff, but not particularly heavy. I've installed a second 90lts LPG tank in there, to supplement the 90lts donut-tank where spare wheel used to squat, but it's yet to be plumbed-in.

P38 Monkey · Feb 12, 2022

Not that I know anything about EAS as my tratter-throwback P38 has coil springs, but the workshop manual says the EAS compressor is set to 145 +/-7.25 psi, so presumably the space-hoppers at each wheel (and the rest of the system) will take that pressure?

Rubberknees · Feb 12, 2022

marjon said:
Have you got your boat engine in the front with spares in the boot.
Or you have got some serious tight bushes.

65 was always fine for the P38 when ran on the emergency Schrader's.

J

+1^^^ Mike, seriously think you have something not right on the rear

Jon Dor · Feb 12, 2022

P38 Monkey said:
Not that I know anything about EAS as my tratter-throwback P38 has coil springs, but the workshop manual says the EAS View attachment 258891 compressor is set to 145 +/-7.25 psi, so presumably the space-hoppers at each wheel (and the rest of the system) will take that pressure?

They're genuine Dunlops all round. When I pump up with a PROPER compressor, they rise very quickly. My toy one I use all the time is a low volume one, so takes a while.

marjon · Feb 12, 2022

P38 Monkey said:
Not that I know anything about EAS as my tratter-throwback P38 has coil springs, but the workshop manual says the EAS compressor is set to 145 +/-7.25 psi, so presumably the space-hoppers at each wheel (and the rest of the system) will take that pressure?

That's for the tank. the bags shouldn't see that under normal running. Maybe more if towing a trailer due to tow ball wt but really shouldn't need the full puff

.

J

Jon Dor · Feb 12, 2022

Rubberknees said:
+1^^^ Mike, seriously think you have something not right on the rear

It's frequently towed up to about three tons quite happily over long distances John. One day well over 600 miles fully laden with a boat for half the distance. I'm determined to get it back on air again ASAP. Ineed to go see William at Lincoln soon. Saw Neurosurgeon yesterday. He's very concerned about numbness - or was it numb nuts?! He's arranging urgent MRI and alerting Orthopaedic surgeon for he says likely another prolapsed disc needing sorting. Maybe I should get Schrader valves in L3, L4, L5 & S1...and one between my legs...but NOT at 135psi! Hahaha...

marjon · Feb 12, 2022

Jon Dor said:
That's interesting J. The car's usually full of stuff, but not particularly heavy. I've installed a second 90lts LPG tank in there, to supplement the 90lts donut-tank where spare wheel used to squat, but it's yet to be plumbed-in.

None of that should make that much difference, in my opinion

.

J

Grrrrrr · Feb 12, 2022

Jon Dor said:
I currently have front running around 80psi, rears at 130 - 135psi.
HOWEVER, that is most definitely NOT a recommendation. That's what I am running with. Both rears deflate a little overnight, one front stays at selected pressure, whilst the other front one needs attention weekly or thereabouts.
Good luck resolving your setup...
Mike.

That sounds a lot in the rears. I think the bags are only rated to maybe 120 psi but check specs online if you can find them.

When using emergency valves the car dips as the weight transfers around. I found it best to put 50 to 55 psi in each corner and then add 5 psi at a time to each corner. About 80 psi should be enough.

Jon Dor · Feb 12, 2022

marjon said:
None of that should make that much difference, in my opinion.

J

Agreed.

Grrrrrr · Feb 12, 2022

Jon Dor said:
But not on my P38 Keith. Gets to normal ride height ONLY with 85 psi min on fronts, 135-140psi on rears.

Something is wrong there. Is there a lot if weight in the back?

Jon Dor · Feb 12, 2022

Grrrrrr said:
That sounds a lot in the rears. I think the bags are only rated to maybe 120 psi but check specs online if you can find them.

When using emergency valves the car dips as the weight transfers around. I found it best to put 50 to 55 psi in each corner and then add 5 psi at a time to each corner. About 80 psi should be enough.

Not on my P38...

marjon · Feb 12, 2022

Jon Dor said:
It's frequently towed up to about three tons quite happily over long distances John. One day well over 600 miles fully laden with a boat for half the distance. I'm determined to get it back on air again ASAP. Ineed to go see William at Lincoln soon. Saw Neurosurgeon yesterday. He's very concerned about numbness - or was it numb nuts?! He's arranging urgent MRI and alerting Orthopaedic surgeon for he says likely another prolapsed disc needing sorting. Maybe I should get Schrader valves in L3, L4, L5 & S1...and one between my legs...but NOT at 135psi! Hahaha...

You certainly haven't lost your sense of humor

. good for you

.

J

Rubberknees · Feb 12, 2022

Jon Dor said:
It's frequently towed up to about three tons quite happily over long distances John. One day well over 600 miles fully laden with a boat for half the distance. I'm determined to get it back on air again ASAP. Ineed to go see William at Lincoln soon. Saw Neurosurgeon yesterday. He's very concerned about numbness - or was it numb nuts?! He's arranging urgent MRI and alerting Orthopaedic surgeon for he says likely another prolapsed disc needing sorting. Maybe I should get Schrader valves in L3, L4, L5 & S1...and one between my legs...but NOT at 135psi! Hahaha...

You take it steady Mike. If they sort one out for between legs give us a bell

Grrrrrr · Feb 12, 2022

P38 Monkey said:
Not that I know anything about EAS as my tratter-throwback P38 has coil springs, but the workshop manual says the EAS compressor is set to 145 +/-7.25 psi, so presumably the space-hoppers at each wheel (and the rest of the system) will take that pressure?

Pressure drops off with distance and it is a square rule so you won't see anything like that at the bags, especially with those 6mm lines.

Jon Dor · Feb 12, 2022

marjon said:
You certainly have lost your sense of humor. good for you.

J

The day I lose my self-deprecating humour will be the day I pop my clogs I reckon, J.

Rubberknees · Feb 12, 2022

Jon Dor said:
The day I lose my self-deprecating humour will be the day I pop my clogs I reckon, J.

Spoken like the true gent you are

Jon Dor · Feb 12, 2022

Grrrrrr said:
Pressure drops off with distance and it is a square rule so you won't see anything like that at the bags, especially with those 6mm lines.

I'll come pump them up at your place then! That's some distance from me.. Hahaha

Jon Dor · Feb 12, 2022

Rubberknees said:
You take it steady Mike. If they sort one out for between legs give us a bell

If it goes pop, you'll likely hear it in Rotherham John!

Rubberknees · Feb 12, 2022

Jon Dor said:
If it goes pop, you'll likely hear it in Rotherham John!

He He

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