New hydramount sloshes like a coconut - correct?

alan richard · 22nd June 2020, 20:52

It's all in the title really.

I have bought a new diesel hydramount which, when shaken gently, sounds like a 3/4 full coconut.

For those who have experience in shaking these things, does that sound right?

Fanx.

a

marinabrian · 23rd June 2020, 07:37

Quote:

Originally Posted by alan richard

It's all in the title really.

I have bought a new diesel hydramount which, when shaken gently, sounds like a 3/4 full coconut.

For those who have experience in shaking these things, does that sound right?

Fanx.

a

Not at all, that sounds like either a cheap copy or faulted unit

Send it back either for an exchange or refund, and buy one from a reputable seller

Brian

alan richard · 23rd June 2020, 09:29

Thanks for confirming that. It didn't seem right to me.

It is fresh from DMGRS - Perhaps just an odd duff one that sods law sent in my direction. I will drop them a line.

Cheers Brian.

In fact 3/4 full was optimistic - I'd pessimistically say it was half empty!

alan richard · 24th June 2020, 08:03

"Hello Alan,
Don't worry - this is normal, and the original mount fitted to my MG ZT did the same when removed (this also hadn't leaked).
"

Anyone?

marinabrian · 24th June 2020, 08:51

The original diesel hydramount is filled with a very viscous silicone

In addition the shore hardness of the rubber in diesel models is different to the petrol version.

I have the original used mount removed from my ZT, and a new genuine KKB101923 hydramount, and neither slosh when shaken.

I hope this clarifies a little

Brian

alan richard · 24th June 2020, 10:46

Clarifies?

Crikey no! That muddies the water completely! Thanks!

Seriously - Appreciate the answer Brian. I don't know anything about these items and I'd like to have another to compare it with.
Instinct tells me that it shouldn't go 'glug'

This part No. is KKB101914

clf · 25th June 2020, 19:12

Assuming the fluid inside is some kind of oil to allow for damping of the engine, then it would be reasonable.to.assume that once the weight of the engine is applied, the sloshing would decrease. The amount of fluid also it would.contain, along with the material it is made from, I imagine would be relative to the engine that it is designed for.

So with the above in mind, again 'assuming' it to be fit for purpose, could it be that it was designed for a heavier engine (more compression, less space for fluid, therefore, unladen, more sloshing?)..

Sent from my SM-A600FN using Tapatalk

alan richard · 26th June 2020, 06:30

@sln8458 - Tell yer wife all I see is useful stuff on your bench! 2nd row of holes - Whitworth or UNC?

@clf - Glycol filled as I understand it but I don't know much about them. If it has 2 chambers in it then it could act like a shock absorber as it squishes about, I guess.
Not sure about Air/ glycol - air would compress and add a bit of bounce.
Just guessing really.

a

Mike Noc · 26th June 2020, 08:54

This from Steve1966, one of the Rover development engineers who worked on engine mounts, explains how the glycol aids the damping effect, and I would have thought any air in the chambers will negate the resonance effect of the glycol, and the result of his finger test.

The fluid is not in the main rubber sections that take the weight of thegearbox. It is around the periphery of the bush. If you press the soft rubber beneath the insert where the bolt goes with your finger you will notice the rubber at the top of the bush puff out a little. The fluid goes into resonance when it is excited by the small displacement over bumps in the road (usually tuned to be around 12 hz). It is this resonance that creates the damping.

Arctic · 26th June 2020, 09:31

I have fitted a few of the hydro mounts & have never heard any sloshing sounds from them failed or new, the worst i seen was the one below V6 had leaked a rusty colour substance from it due to failing over time.

1

I would presume to water intake

2

3

This diesel one was changed due to the owner noticing a little degradation in the rubber but no knocking.

4

5

I was informed that the car felt a lot better to drive after the change over.

6

This is the hydro mount from that car above, and it still seems fine to me, no sloshing sounds come from it.

7

Also the thread can not be pushed over to 3/4 either way.

8

Lets remember that most these hydro mounts being purchased as OEM for (SAIC Motor) will not be for the diesel engine but for the petrol engines

Shaking Stevens.
https://youtu.be/cxe-5oaDdfQ

Diesel
https://rimmerbros.com/Item--i-GRID001744

https://rimmerbros.com/Item--i-KKB101923

1800 petrol engine.
https://rimmerbros.com/Item--i-KKB101903

V6 petrol engines
https://rimmerbros.com/Item--i-KKB101914

22nd June 2020, 20:52	#1
alan richard Avid contributor 75 Tourer cdti Join Date: Jul 2012 Location: Melton Mowbray Posts: 244 Thanks: 62 Thanked 23 Times in 22 Posts	New hydramount sloshes like a coconut - correct? It's all in the title really. I have bought a new diesel hydramount which, when shaken gently, sounds like a 3/4 full coconut. For those who have experience in shaking these things, does that sound right? Fanx. a

25th June 2020, 19:12	#7
clf This is my second home MG ZT CDTi Join Date: Jan 2014 Location: carrick Posts: 7,859 Thanks: 3,494 Thanked 2,657 Times in 1,973 Posts	Assuming the fluid inside is some kind of oil to allow for damping of the engine, then it would be reasonable.to.assume that once the weight of the engine is applied, the sloshing would decrease. The amount of fluid also it would.contain, along with the material it is made from, I imagine would be relative to the engine that it is designed for. So with the above in mind, again 'assuming' it to be fit for purpose, could it be that it was designed for a heavier engine (more compression, less space for fluid, therefore, unladen, more sloshing?).. Sent from my SM-A600FN using Tapatalk __________________ It is not gloss primer .............. it is duct tape silver!

26th June 2020, 09:31	#10
Arctic Give to Learn Freelander 2 Join Date: Aug 2010 Location: West Midlands Posts: 18,709 Thanks: 1,155 Thanked 6,407 Times in 3,874 Posts	I have fitted a few of the hydro mounts & have never heard any sloshing sounds from them failed or new, the worst i seen was the one below V6 had leaked a rusty colour substance from it due to failing over time. 1 I would presume to water intake 2 3 This diesel one was changed due to the owner noticing a little degradation in the rubber but no knocking. 4 5 I was informed that the car felt a lot better to drive after the change over. 6 This is the hydro mount from that car above, and it still seems fine to me, no sloshing sounds come from it. 7 Also the thread can not be pushed over to 3/4 either way. 8 Lets remember that most these hydro mounts being purchased as OEM for (SAIC Motor) will not be for the diesel engine but for the petrol engines Shaking Stevens. https://youtu.be/cxe-5oaDdfQ Diesel https://rimmerbros.com/Item--i-GRID001744 https://rimmerbros.com/Item--i-KKB101923 1800 petrol engine. https://rimmerbros.com/Item--i-KKB101903 V6 petrol engines https://rimmerbros.com/Item--i-KKB101914 __________________ Arctic Givology Learn to Give Everything is Achievable ad altiora tendo. Check out our Nano meet dates http://www.midlandsnanomeets.co.uk/ http://www.the75andztclub.co.uk/index.php?thepage=howto " You do the work , we supply the expertise " Last edited by Arctic; 26th June 2020 at 12:21.. Reason: Photo Editing

23rd June 2020, 09:29	#3
alan richard Avid contributor 75 Tourer cdti Join Date: Jul 2012 Location: Melton Mowbray Posts: 244 Thanks: 62 Thanked 23 Times in 22 Posts	Thanks for confirming that. It didn't seem right to me. It is fresh from DMGRS - Perhaps just an odd duff one that sods law sent in my direction. I will drop them a line. Cheers Brian. In fact 3/4 full was optimistic - I'd pessimistically say it was half empty!

24th June 2020, 08:03	#4
alan richard Avid contributor 75 Tourer cdti Join Date: Jul 2012 Location: Melton Mowbray Posts: 244 Thanks: 62 Thanked 23 Times in 22 Posts	"Hello Alan, Don't worry - this is normal, and the original mount fitted to my MG ZT did the same when removed (this also hadn't leaked). " Anyone?

24th June 2020, 08:51	#5
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	The original diesel hydramount is filled with a very viscous silicone In addition the shore hardness of the rubber in diesel models is different to the petrol version. I have the original used mount removed from my ZT, and a new genuine KKB101923 hydramount, and neither slosh when shaken. I hope this clarifies a little Brian

24th June 2020, 10:46	#6
alan richard Avid contributor 75 Tourer cdti Join Date: Jul 2012 Location: Melton Mowbray Posts: 244 Thanks: 62 Thanked 23 Times in 22 Posts	Clarifies? Crikey no! That muddies the water completely! Thanks! Seriously - Appreciate the answer Brian. I don't know anything about these items and I'd like to have another to compare it with. Instinct tells me that it shouldn't go 'glug' This part No. is KKB101914

26th June 2020, 06:30	#8
alan richard Avid contributor 75 Tourer cdti Join Date: Jul 2012 Location: Melton Mowbray Posts: 244 Thanks: 62 Thanked 23 Times in 22 Posts	@sln8458 - Tell yer wife all I see is useful stuff on your bench! 2nd row of holes - Whitworth or UNC? @clf - Glycol filled as I understand it but I don't know much about them. If it has 2 chambers in it then it could act like a shock absorber as it squishes about, I guess. Not sure about Air/ glycol - air would compress and add a bit of bounce. Just guessing really. a

26th June 2020, 08:54	#9
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,547 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	This from Steve1966, one of the Rover development engineers who worked on engine mounts, explains how the glycol aids the damping effect, and I would have thought any air in the chambers will negate the resonance effect of the glycol, and the result of his finger test. The fluid is not in the main rubber sections that take the weight of thegearbox. It is around the periphery of the bush. If you press the soft rubber beneath the insert where the bolt goes with your finger you will notice the rubber at the top of the bush puff out a little. The fluid goes into resonance when it is excited by the small displacement over bumps in the road (usually tuned to be around 12 hz). It is this resonance that creates the damping.