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Griff097

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Reply with quote  #1 
My Hymer 584 is losing 20 psi in a few days with no obvious nails etc, I wondered if the wheels have any known problems?

There steel wheels so I assume that cracks are unlikely?
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Drew

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Reply with quote  #2 
Other than taking the tyre off, a jug of warm soapy water (Washing up liquid) and a paint brush or squirty bottle should give you an indication. Just work your way slowly round the tyre until you see the bubbles.
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BurtSner

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Reply with quote  #3 
Are all 4 losing the same amount equally?

What tyres are you using?

Do you know the age code of the tyres. It’s a 4 digit number embossed on the sidewall. e.g. 0914 would be week 9 of 2014.

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Pudsey Bear

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Reply with quote  #4 
Check the joint between the wheel ring and the disc of the wheel (the bolt on bit) too they are known to have holes from the initial welding when the machine burns through slightly but not enough to show up when new, it becomes apparent when the wheel starts to rust badly, usually behind the wheel trims, I know for sure as it just happened to me this week, had the wheel to the tyre place, tyre off clean rin off, paint sealer on and refit, they didn't have a big enough water bath to fully immerse the wheel, the next place did and I had bubbles at the join.
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Link to self build pictures

Link to sort of blog on facts


http://tinyurl.com/nzyry9n

2007 Citroen Relay XLWB self build
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Griff097

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Reply with quote  #5 

Quote:
Originally Posted by BurtSner
Are all 4 losing the same amount equally?

What tyres are you using?

Do you know the age code of the tyres. It’s a 4 digit number embossed on the sidewall. e.g. 0914 would be week 9 of 2014.


They are GT Radials and 4812 so fairly old, I was in a tyre place earlier and they suggested replacing tyres every 5 years and installing rubber valves instead of the metalones currently fitted.

It's 3 out of the 4 that are losing about the same amount.

 

 

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Griff097

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Reply with quote  #6 
Quote:
Originally Posted by Pudsey Bear
Check the joint between the wheel ring and the disc of the wheel (the bolt on bit) too they are known to have holes from the initial welding when the machine burns through slightly but not enough to show up when new, it becomes apparent when the wheel starts to rust badly, usually behind the wheel trims, I know for sure as it just happened to me this week, had the wheel to the tyre place, tyre off clean rin off, paint sealer on and refit, they didn't have a big enough water bath to fully immerse the wheel, the next place did and I had bubbles at the join.


Not 100% I am following your description, is that the join in the center of the wheel well?
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BurtSner

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Reply with quote  #7 
I think that’s what he means as there is a weld where they join the rim to the bit with the bolt holes.

I’m surprised to hear about the valves, I always thought metal was the way to go - I’d ask questions of other tyre companies as all I’ve ever seen on MH wheels are metal.

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eurajohn

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Reply with quote  #8 
Quote:
Originally Posted by Griff097
They are GT Radials and 4812 so fairly old, I was in a tyre place earlier and they suggested replacing tyres every 5 years and installing rubber valves instead of the metal ones currently fitted.

It's 3 out of the 4 that are losing about the same amount.



I think I'd steer clear of a tyre company that advised replacing the metal valves with rubber ones!
The manufacturers fit metal valves to allow the higher pressures recommended.
There are I believe some rubber valves that will safely allow high pressures but the normal cheapie ones that are commonly used do not do so with a safety margin.

If the valve fitment is leaking the washers sealing the joint can be renewed and of course the stems can be changed.


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SANDBAGSID

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Reply with quote  #9 
Mine are fitted with rubber valves and never had a problem with them. Must admit I have read that they do fit metal ones on some Moro’s.
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eurajohn

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Reply with quote  #10 
Don't know why, but only just picked up on the tyres fitted, are they commercial vehicle tyres? I only ask as if car or 4x4 they won't have the necessary load rating for your van
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Sevenup

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Reply with quote  #11 
I run my tyres at 80psi/5 Bar. I use metal valves that came as standard with my van. The specification for rubber valves gives a far lower safety value. I would have thought your insurance might be at risk if using rubber valves after metal ones had been original equipment. I thought I’d seen a thread on the Schrader valve inserts somewhere that suggest there were low and high pressure versions too. These are safety critical items imo.
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Griff097

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Reply with quote  #12 
Quote:
Originally Posted by eurajohn
Don't know why, but only just picked up on the tyres fitted, are they commercial vehicle tyres? I only ask as if car or 4x4 they won't have the necessary load rating for your van


I don't know offhand, but that does lead me to anoth question, given the age of them I am planning on replacing them and I gather the Michelin motorhome tyres come highly regarded?
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Griff097

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Reply with quote  #13 
Quote:
Originally Posted by Sevenup
I run my tyres at 80psi/5 Bar. I use metal valves that came as standard with my van. The specification for rubber valves gives a far lower safety value. I would have thought your insurance might be at risk if using rubber valves after metal ones had been original equipment. I thought I’d seen a thread on the Schrader valve inserts somewhere that suggest there were low and high pressure versions too. These are safety critical items imo.


Is your MH an A class too?

I was wondering what sort of weight you are running with those pressures?
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Sevenup

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Reply with quote  #14 
I have an A Class. Recently updated to 4050kg. On engineers advice I was required to fit 112Q rated tyres (15 inch). My front axle is still only rated at 1800kg. My rear is 2259kg. The tyres themselves state that the rating of 112Q applies at 80psi. Presumably I need the extra load on the front to manage different loads under braking from a heavier rear? The stiffer tyre walls give a harsher ride over broken road surfaces but on most roads you can’t easily tell the difference. I needed to change my tyres from 215/ r15 (109) even though the tyres were barely a year old but the extra weight capacity is useful because we run close to 3500 kg all of the time and might, unwittingly gone over weight capacity at times. With barely 3k miles on them I’ll put them in the sale section on here once I’ve checked the tread depth on Wednesday.
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eurajohn

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Reply with quote  #15 
Quote:
Originally Posted by Griff097


I don't know offhand, but that does lead me to anoth question, given the age of them I am planning on replacing them and I gather the Michelin motorhome tyres come highly regarded?


The latest Michelins are good tyres but you really do not NEED to fit "camper" tyres, any quality make of tyre with the correct load rating are adequate and possibly cheaper than camper ones.

A short while ago I had to replace the tyres on my "A" class Pilote it's on a Merc chassis and there are no "camper" tyres with the correct size and load rate for it I fitted Michelin commercials.

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Griff097

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Reply with quote  #16 
Quote:
Originally Posted by Sevenup
I have an A Class. Recently updated to 4050kg. On engineers advice I was required to fit 112Q rated tyres (15 inch). My front axle is still only rated at 1800kg. My rear is 2259kg. The tyres themselves state that the rating of 112Q applies at 80psi. Presumably I need the extra load on the front to manage different loads under braking from a heavier rear? The stiffer tyre walls give a harsher ride over broken road surfaces but on most roads you can’t easily tell the difference. I needed to change my tyres from 215/ r15 (109) even though the tyres were barely a year old but the extra weight capacity is useful because we run close to 3500 kg all of the time and might, unwittingly gone over weight capacity at times. With barely 3k miles on them I’ll put them in the sale section on here once I’ve checked the tread depth on Wednesday.


Let me know what they are and how much your looking for them please?
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Sevenup

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Reply with quote  #17 
I know they are CP tyres and are 215/70 r15 109 rated. Don’t have the exact depth right now but will confirm Wednesday. £50 for the pair but let me confirm the exact tyre first. At one tine I had a pair of Camper Contacts so want to make sure. I felt the tread but didn’t have a tread gauge with me and I’ve left them in the van.

What area do you live in? I’m heading for Newcastle ferry on Friday so if you are in central or south Scotland or north of england I might even be able to deliver them. My wife is at home but she might post otherwise but I expect that adds to the cost. The alternative is you pick them up near Loch Lomond. I wouldn’t be getting rid of them if I hadn’t uprated the weight.
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Griff097

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Reply with quote  #18 
Quote:
Originally Posted by Sevenup
I know they are CP tyres and are 215/70 r15 109 rated. Don’t have the exact depth right now but will confirm Wednesday. £50 for the pair but let me confirm the exact tyre first. At one tine I had a pair of Camper Contacts so want to make sure. I felt the tread but didn’t have a tread gauge with me and I’ve left them in the van.

What area do you live in? I’m heading for Newcastle ferry on Friday so if you are in central or south Scotland or north of england I might even be able to deliver them. My wife is at home but she might post otherwise but I expect that adds to the cost. The alternative is you pick them up near Loch Lomond. I wouldn’t be getting rid of them if I hadn’t uprated the weight.


Going to the IoM, TT?

I am in South Wales sp postage will be required, but no problem if you have a printer to do the label.
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Sevenup

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Reply with quote  #19 
No problem about a printer. I’ll need to wrap them somehow. Not sure couriers are excited about tyres but I’ll check it out.
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Sevenup

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Reply with quote  #20 
Tyres are 215/70 r15 CP continental Camper tyres 5mm tread on both.
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