Hymer black tank macerator project (1 Viewer)

[Hymer 1961]

Sounds like more doo’s than don’ts.

 

[Kim H]

@DavidG58 we've met people that have changed from the Jet toilet, that Hymer fitted, to a Marine toilet. Might be worth investigating?

 

[DavidG58]

08:00 knock on door postman with the oddest looking parcel we have ever received

Took it upstairs Bev looked positively worried

I unwrapped my selection of 'bits' from a great little firm supplying silicone tubing in all sizes colours and various shapes and adaptors

Started putting a few bits together and realised a small issue, I had bought 'sleeves' to join some of the tubes together and still keep full bore pipe size, trouble was I now think the data sheet was slightly out, or maybe my maths were,

the tubing has a wall thickness of 4.5mm, so in theory a 25mm pipe should fit snugly into a 34mm sleeve, but it doesn't, it fits but a little too easily (read loose) but having bought just about every similar size they make I happen to have a piece 32mm, annoyingly it fits beautifully into that

Still no stopping me now, I have a load of bits the sun is shining, I either go shopping, talk to Mum or mend the loo no contest, after shopping and checking on mum I will do the loo, or so Bev says

I have already had a rush of blood to the head moment and bought 2 90 degree bend adaptors to suit the new macerator, although they are more or less the right size, due to inlet outlet positions on the macerator and space available the bends are redundant

No problem I get back on line and order pretty much one of everything and a few doubles of things from 25 - 44mm only joking but the bill did come to £63



So now here I am pretty much for the first time offering up the macerator to the outlet fro the toilet, pretty much immediately noticed that now I have a better suited inlet adaptor, 2 bends and a 'sleeve' and we are out of here

And that it pretty much what happened next nearly all of above bits are ‘extras’

followed by a few tweaks to get the level of the outlet pipe pretty much the same as the old one, only to find it make no odds as this device holds water where as the old one dribbled though, so for real life example, if you had a wee the level in the bowl never rose, this one has to be activated to discharge. I guess it makes sense if being used as a tank outlet it would need to hold

No problem, other than when tested I can only say the closest noise I recall hearing in my lifetime my old Grandma used to call 'old moaner' the fog horns at Thanet lighthouse boy it does sound loud, anybody parking near us might as well run a generator it would be quieter

It might just be the newness, making it sound loud, might be looking for some insulation, the toilet unused cassette area will make for quite a good boom box

I have even fitted a temporary support piece and remounted the control board which still works

Even put a bit of cut off hose to possibly reduce vibration noise

So we are good to go

 

[The Wino]

I was only guessing and making those lucky ones with carry away poo boxes slightly jealous

Now they are mocking me even more than before and I am even less inclined to fix it

But it does account for why it never seemed to last as long as would have thought

Tough sh** ?

 

[pappajohn]

Well you already know the pipes and connectors would cost more than £160 from Hymer so your already saving money.
Make double sure all the connections are secure... That macerator will be like a fireman's hose Compered to the original toy one.
They are designed to pump over MANY meters AND uphill.

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[Kim H]

We're impressed David! Anthony says you need to put a peeled banana in the bowl now to do a 'solids' test

 

[funflair]

Nice one David

Martin

 

[tacr2man]

Be warned you have engineered yourself a time bomb , trying to tighten a silicone hose onto a silicone hose. . The hoses should be tightened onto ali or steel pipes, these items are normally for coolant or turbo . It will be OK to use a straight pipe rather than humped as you should not have that much pressure . You can probably rescue the set up by fitting a steel or ali pipe inside the smaller hose where the larger hose is clamped to it to support. @DavidG58

 

[DBK]

I've found a drawing of what you need to make with all your bits. But on a serious note, well done, I'm sure you will crack it.

 

[dabhand]

Well done David, I await the next instalment (not literally), which presumably will be the “shit hitting the fan” episode

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[Robert Clark]

Great result David - well done !

It’s very satisfying when you can fix things yourself.

 

[The Wino]

I'm sure we would all shake your hand (as long as it doesn't leak!!!!!!)

 

[dabhand]

DAVID, just so you don’t feel as though it all happens to you, I had my very own @DavidG58 moment on the way back from the FFF meet, fridge door flew open and smashed the bottom hanging point off the door, remembering your tribulations from a few years ago, I searched the forum and found that our good mucker @Terry had offered a solution to you, after ringing Terry (cheers Terry) he was able to tell me how he adapted your door, no ordering fridges that won’t go through the van door for me matey, job done, cheers David, you are a learning curve inspiration to us all.

 

[DavidG58]

@Kim H i was inspired by your proposal

No bananas to hand but found some past their best kiwi fruit possibly more realistic of my own offerings

Looks worse than I thought it might

Gave it a flush one vanished

Not other 2

Glad we were playing with fruit, I man handled them and offered up to outlet they are too big, ie over 44mm

So proved it works flushed twice since no resistance at all

Excess put in sink,

again so pleased it was fruit

Lymington will be the real test, hopefully the hose connections will hold up, have to say they seem very well stuck by friction alone even without the jubilee clips

Positive thoughts please

 

[DavidG58]

DAVID, just so you don’t feel as though it all happens to you, I had my very own @DavidG58 moment on the way back from the FFF meet, fridge door flew open and smashed the bottom hanging point off the door, remembering your tribulations from a few years ago, I searched the forum and found that our good mucker @Terry had offered a solution to you, after ringing Terry (cheers Terry) he was able to tell me how he adapted your door, no ordering fridges that won’t go through the van door for me matey, job done, cheers David, you are a learning curve inspiration to us all.

Watch out for the top pin ours ended up at about 45 degree angle and has been realigned but now feels like the weakest link

Terry lifted our door as high as it would but still get very wary if door is loaded and awnings open, another w@nk Hymer design equally supported by the cr@p build quality of Dometic

Andy 63 had to save us last December when the top pin gave way again, possibly the door was heavily loaded with tonic though

Glad you got sorted

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[funflair]

@Kim H i was inspired by your proposal

No bananas to hand but found some past their best kiwi fruit possibly more realistic of my own offerings

View attachment 247294

Looks worse than I thought it might

Gave it a flush one vanished

Not other 2

Glad we were playing fruit man handled them and offered up to outlet they are too big ie over 44mm

So proved it works flushed twice since no resistance at all

View attachment 247295

Excess put in sink,

again so pleased it was fruit


View attachment 247296

Lymington will be the real test, hopefully the hose connections will hold up, have to say they seem very well stuck by friction alone even without the jubilee clips

Positive thoughts please

I'm not coming round yours for fruit salad now

Martin

 

[Taran_Las]

I'm not coming round yours for fruit salad now

Martin

If David offers you a smoothie it might be best to gracefully decline Martin


Seriously, well done David

 

[dabhand]

Watch out for the top pin ours ended up at about 45 degree angle and has been realigned but now feels like the weakest link

Terry lifted our door as high as it would but still get very wary if door is loaded and awnings open, another w@nk Hymer design equally supported by the cr@p build quality of Dometic

Andy 63 had to save us last December when the top pin gave way again, possibly the door was heavily loaded with tonic though

Glad you got sorted

I released the top pin to get the door back on, back on tight although lifting the door a Knats might be a good idea. Pretty sure our door came off because of all the beer in the salad draw pushing against the door when we go around corners! Have to put salad in instead....not!

 

[Lenny HB]

Well done David nice to see you getting stuck in, even if it is into a pile of sh*t.

 

[Mr Mousy]

Well done David, I suggest when we are all at the Lymington meet you ask for volunteers to help fill your black tank so you can test your handiwork properly. I'll bring the gin if I can use your facilities.
@DavidG58

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[DavidG58]

@Mr Mousy now I know how small the tank is that is not going to work Martin, but bring the gin anyway I hadn’t realised you were going to be back for this meet , will be nice to catch up

 

[Neilfg]

Excess put in sink, again so pleased it was fruit

View attachment 247296

Lymington will be the real test, hopefully the hose connections will hold up, have to say they seem very well stuck by friction alone even without the jubilee clips

Positive thoughts please

I believe that @DavidG58 is doing a special Gin mix that requires a slice of KIWI

 

[Jammy]

If the noise is vibration go see your local jaguar breaker and ask for an x350 pump mount frame. They use rubber and springs in combination to insulate on the last model XJ. I know hey work well as when I rebuilt my old pump I mounted the frame the wrong way and it made a right racket and when right I never knew it was there.

 

[ChrisL]

Be warned you have engineered yourself a time bomb , trying to tighten a silicone hose onto a silicone hose. . The hoses should be tightened onto ali or steel pipes, these items are normally for coolant or turbo . It will be OK to use a straight pipe rather than humped as you should not have that much pressure . You can probably rescue the set up by fitting a steel or ali pipe inside the smaller hose where the larger hose is clamped to it to support. @DavidG58

I think tacr2man is 100% right about this being a time bomb, i believe that once the pipes have stretched a bit by use you will end up with poo leaking everywhere. Have a look at this link and see if you can find the right size coupler they are not very expensive, also note they have a ridge at the end so once the clip is tightened the hose can't slide off.

 

[DBK]

If David offers you a smoothie it might be best to gracefully decline Martin


Seriously, well done David

Making smoothies was what this was all about.

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[funflair]

I think tacr2man is 100% right about this being a time bomb, i believe that once the pipes have stretched a bit by use you will end up with poo leaking everywhere. Have a look at this link and see if you can find the right size coupler they are not very expensive, also note they have a ridge at the end so once the clip is tightened the hose can't slide off.

Should be no pressure in the outflow pipes as long as nobody puts their finger over the end, so I can understand peoples concern but don't think it will blow.

Martin

 

[ChrisL]

Should be no pressure in the outflow pipes as long as nobody puts their finger over the end, so I can understand peoples concern but don't think it will blow.

Martin

Well you may well be right Martin, but why take the risk for the few pounds that the couplers cost? If it was just clean water or even grey maybe, but the thought of having to clean up after a black water leak is something I personally would prefer not to risk, maybe I'm just a bit squeamish

It may also be worth noting that Viper can make custom one off pipes, the cost would depend on whether they have to make new tooling or modify existing but it is possible to do if required.

 

[Kim H]

DavidG58

Saw on the roof light thread you were undertaking more work on the macerator project, what you up to?

I replaced mine and obtained the same model that Hymer use in their upgrade from a marine chandlers.

Anthony

 

[DavidG58]

DavidG58

Saw on the roof light thread you were undertaking more work on the macerator project, what you up to?

I replaced mine and obtained the same model that Hymer use in their upgrade from a marine chandlers.

Anthony

bit of plumbing modification

I mounted the macerator horizontally at the toilet outlet, it didn’t clear as well as I hoped. But I have found the macerator needs to be lower than what it is pumping

so it is now mounted vertically, more or less as the original was , just need an extra piece of pipe to reroute the outlet

 

[DavidG58]

Reopening my own old thread , can’t believe it’s 5 years old

Something isn’t working for a while now (earlier trips out this year) intermittently the macerator hasn’t not operated when button pressed , but always gone with a few presses

Until this weekend oddly and although possibly / probably related the flush pump on a separate switch acted similarly

Until this morning the macerator just clicks rather like flat battery / starter motor combination. But the flush operation is now working every time, but darent keep trying that as bowl can only be emptied by macerator operation or hand bailing out

Had my multi meter on the mini control board, this voltage reading matches my Hymer display for leisure battery at 12.9V

Reading the Hymer display I have now found that when macerator button is pressed the volts drop to 7V and the A’s drawn show 28A

Logic says 7V is too low to run the pump, but is it dropping because the macerator is faulty, don’t think jammed due to intermittently working fine

Waiting for Martin funflair to show his face , luckily we are in the same field this weekend hoping for inspiration

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