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Truma Mk Ii Housing Fault


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It's funny how what looks like a simple job turns into a marathon. I noticed on my Truma water inlet, that the plastic thread for the Crystal filter had split and a piece had broken off. (See attached photo)

So thinking well I might as well upgrade as I had heard that Truma are no longer producing the Mk II inlet as they are pushing the new ultraflow or Mk 4 unit.

Purchased the housing great, except the old had a none return valve fitted on the filter outlet the new one does not. So off I went to find an inline one. Be aware they are as rare as rocking horse s**t. Try doing a search on the Internet for one?

Oh and don't forget the connection for the pump is now a new pistol grip type that are not the same as before, so I purchased a complete new pump and a spare grip to fit to my old one.

The cost now mounting.

I am praying that as my caravan is a 2006 model I will not have to purchase a new surge flow regulator and that the existing Wale one will be OK otherwise it's going to be another £80 plus.

Why is this a cautionary tale? I have seen other posts on forums where people are having the exactly the same problem with the old Mk II. No I did not over tighten the filter, and yes I did use olive oil to lubricate the threads but it appears as though the plastic has prematurely aged being brittle and crumbling.

I hope this helps.

Stu

post-5189-1236272776_thumb.jpg

Edited by lancer

Bailey Pegasus 534 KIA Sportage previous Caravan Bailey Pageant series 5 Champagne 2006.

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Hi there, i have seen the same problem many times on the older crystal filter housing and as far as i am aware the housing is still available to replace as i have done on quite a few frost damaged and aged housings, also is i recall, a housing is available that blanks out the filter part of the housing leaving only an inlet for the newer truma pump which has an inline filter on the pump unit itself. i hope this helps but if it seems i have not fully understood your query then please feel free to msge me.

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Truma/Miriad stocks of mk11 housings disappeared like snowflakes in Hell once it was known they were the last, there must then be plenty of dealers with stock but will they sell one?

 

As it is I'm not bothered, the mk4 as I call it is better and a direct replacement, it's also as far as I'm concerened the same price to sell as a mk3 to mk2 kit so no ones worse off.

 

The non-return valve I would not concern myself with, it was nothing but trouble on the mk2 if it was not jammed open so not working it would just as easily jam nearly shut and restrict flow?

gary1s.gif

 

Arc Systems are specialist Carver caravan product repairers, committed to providing a comprehensive service as well as spare parts for these popular heaters.

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The non-return valve I would not concern myself with, it was nothing but trouble on the mk2 if it was not jammed open so not working it would just as easily jam nearly shut and restrict flow?

 

Hi Gary.

Surely without a non return valve, the water system will bleed out when the pump is disconnected won't it??????

Cheers.

T.

HI. ITSME.

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Hi Gary.

Surely without a non return valve, the water system will bleed out when the pump is disconnected won't it??????

Cheers.

T.

 

Hi Mick, Gary & Tom,

It states in the box of the MK 4 (An added photocopied sheet) that an inline none return valve must be fitted. It shows one for a flexible line and one for a semi rigid line. <_<

Not being a caravan fitter, I hoped that the one I have purchased is correct? I did a simple test; it’s a thick blue pipe that although it’s bent around a curve or two, to me seemed very stiff and solid so I ordered the semi rigid type fingers crossed.

I wasn’t concerned about the basic cost of the housing as you say they are much the same. It was that having decided to upgrade to the Mk 4, I was unaware that there was more to it than just exchange one housing for another.

Well I am a newbie to caravanning (this will be my third season) we live and learn as they say.

I just hope after all this, the flow will be better than on the old fitment. :rolleyes:

Thanks Stu

Bailey Pegasus 534 KIA Sportage previous Caravan Bailey Pageant series 5 Champagne 2006.

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Hi Mick, Gary & Tom,

It states in the box of the MK 4 (An added photocopied sheet) that an inline none return valve must be fitted. It shows one for a flexible line and one for a semi rigid line. <_<

Not being a caravan fitter, I hoped that the one I have purchased is correct? I did a simple test; it’s a thick blue pipe that although it’s bent around a curve or two, to me seemed very stiff and solid so I ordered the semi rigid type fingers crossed.

I wasn’t concerned about the basic cost of the housing as you say they are much the same. It was that having decided to upgrade to the Mk 4, I was unaware that there was more to it than just exchange one housing for another.

Well I am a newbie to caravanning (this will be my third season) we live and learn as they say.

I just hope after all this, the flow will be better than on the old fitment. :rolleyes:

Thanks Stu

 

 

Thats right a non return valve is required as most if not all the caravans i have seen with the crystal filter housing are on a pressure sytem which will cut the pump out when the system is up to pressure, so without the non return valve the system will bleed back onto the water barrel and cause the pump to run constantly or keep switching on and off. If you are fitting a housing without a non return valve then i suggest maybe fitting an inline non return inside the van somewhere before the pressure switch.

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Semi-rigid pipe is most often semi clear with either a red or blue stripe, it's thin walled and 12mm outside diameter, flexible hose apart from being more flexible is either 10mm or 12mm inside diameter with a much thicker wall

 

 

It would seem with a pressure system that the housing does need a non-return valve, but no, the pressure switch has it's own, pumps with built in pressure switches also look after themselves.

Carvers water heater has it's own albeit Truma's heater does not.

 

Having used a mk2 housing for near on 12yrs, the only problem with removing the valve was a dribble from the housing when he pump was removed, small price to pay for the troubles it caused while fitted.

gary1s.gif

 

Arc Systems are specialist Carver caravan product repairers, committed to providing a comprehensive service as well as spare parts for these popular heaters.

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Having used a mk2 housing for near on 12yrs, the only problem with removing the valve was a dribble from the housing when he pump was removed, small price to pay for the troubles it caused while fitted.

 

Hi Gary.

What troubles? I have had the Mk2 Crystal for a number of years without any probs. Luck, or am I tempting fate????

Cheers.

T.

Edited by tommytruck

HI. ITSME.

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