SteveSarabande
Well-Known Member
Tucked up on the boat, toasty with the eber running, but all i can hear is the ticking of the pump. I used the rubber mount that came with the kit but its still noisy. Would enclosing it in pipe insulation help?
Noisy eberspacher pump
- Thread starter SteveSarabande
- Start date
David2452
Well-Known Member
That is something I used to do but found a few pumps got very warm which I did not like, best to let the heat dissipate, the pumps actually are supposed to be kept as cool as possible. The pumps are not particularly noisy per se but the vibration from the constant solenoid operation is easily transmitted through the mounting panel. The standard rubber mounts are a bit of help but not a real solution. I have been objectively experimenting with some pump hangers designed for use on Mercedes TTCs which use the same pump with good results. The main thing is to mount on something that will not transmit noise and try not to use copper tube but rather Tygon unless you need a BSS.
SteveSarabande
Well-Known Member
What do you mean by pump hangers? I have copper pipe, does that transmit the sound more than the alternative?
cliff
Well-Known Member
Pump hangers => bobbin mounts - I used one from a motor factors originally intended as an exhaust mounting.
Yes, the copper pipe will transmit the noise very effectively. I use diesel spill way tubing (return tubing) - highly resistant to Diesel and absorbs the noise from the pump.
David2452
Well-Known Member
Copper pipe is an absolute buggeration fror noise transmission, especially if connected to the pump with compression fittings. Tygon always used to be used before BSS and most marine kits come with copper now, Tygon is still permissible on vehicles and seagoing craft. The pump hanger is a stainless bracket with two rubber hangers and it allows more movement of the pump, I have mounted one on a boat with good results and also on my test rig also with good results.
David2452
Well-Known Member
Not the ones I am trying, bobins and rubber lined P clips are next to useless.
cliff
Well-Known Member
Try a softer bobbin - worked for me - got to listen really carefully now to know if the damn thing is clicking or not
rob2
Well-Known Member
I seem to recall a suggestion that the OEM isolation mount should be fixed to a plate which in turn is mounted using bobbins. On that basis, I wondered whether the plate could be glued to a closed cell foam layer and the whole assembly glued to a bulkhead? I believe that ideally two dissimilar isolation media should together be more effective. That doesn't address the transmission along the fuel lines, though. I'd go for the length of plastic line so long as it is protected from any potential engine fire.
Rob.
Rob.
David2452
Well-Known Member
Tried all sorts of bobbins, rubber mounts and other stuff as people ask me to try and reduce the noise on a regular and often basis and the main thing I (and other heater techs I speak to) is the surface to which the whole thing is mounted and the noise transmitted through that. I had not seen the hangers I mentioned until recently as they are not a marine product and they differ from all other mounts I have come across in that the heater is actually suspended loosely rather than clamped which assists in noise transmission.
davidwf
Well-Known Member
I cable tied mine to a bilge pump pipe stops the vibration a treat.
david_bagshaw
Well-Known Member
OH SO RIGHT re BSS
turned super quiet to irritatingly bloddy loud !
it use to be on nylon pipes with flexible sections hung on nylon ties. now cu pipe that uses the fuel tank as a resonating box.
pampas
Well-Known Member
mine is mounted on 10mm ply and is so quite when in the cabin, the hot air is the noisy bit.
superheat6k
Well-Known Member
I am so glad I don't gave to comply with that ridiculous over zealous standard. But could you not use something like an aeroquip braided hose and still comply with BSS requirements ?
david_bagshaw
Well-Known Member
BSS examiners dont like braided hoses , has to be BS whatever and nothing else will do, or solid metal pipe.
SteveSarabande
Well-Known Member
Have you got a link for the pump hanger David?
Back in Cardiff now, time to check out this vibration. I probably made it worse by not cutting the copper to length, it was a metre or so too long so i left a coil of it near the pump which is probably not helping.
Back in Cardiff now, time to check out this vibration. I probably made it worse by not cutting the copper to length, it was a metre or so too long so i left a coil of it near the pump which is probably not helping.
Robin B
Well-Known Member
Apparently, coiling is a way to quieten it. Not sure how though.
Ian_Edwards
Well-Known Member
Using a foam based noise barrier sheet?
If I made up a 100mm x 100mm piece of 10mm marine ply and then glued that to a bit of foam based noise reducing sheets (32mm thick with a lead polymeric barrier) and then glued that to a bulk head and mounted the solenoid pump on to the 100mm x 100mm x 10mm ply, so that the pump has a sound barrier between it and the bulkhead.
Would that be effective if making a significant reduction in the noise transmitted into the boats structure?
If I made up a 100mm x 100mm piece of 10mm marine ply and then glued that to a bit of foam based noise reducing sheets (32mm thick with a lead polymeric barrier) and then glued that to a bulk head and mounted the solenoid pump on to the 100mm x 100mm x 10mm ply, so that the pump has a sound barrier between it and the bulkhead.
Would that be effective if making a significant reduction in the noise transmitted into the boats structure?
David2452
Well-Known Member
Sadly not, I only came across them whilst talking to a motor home specialist Webasto dealer so got a handful, they are designed for the dual top (water & air combo) heater pumps and if you think boat owners complain about the noise you should hear th motorhome installers problems.
David2452
Well-Known Member
In a word, yes, quite a bit, wait, that's four.
David2452
Well-Known Member
if it is masked BS7840 and 2mm bore yes, otherwise no, oh, it will not be, it is really annoying as Tygon tube is pretty flame retardent and ideal, BS7840 hose is acceptable but the bore is too large