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25th June 2020, 15:25 | #21 |
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Here is the one I threw away, only to get it out of the bin, only for a few mins honest.
That is as far as I could push the top stud over, and that's the fubar'd one
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25th June 2020, 15:50 | #22 |
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That's a handy plate in your vice - I must make one.
I can't stretch mine that far but then I don't know how tough your thumb is! |
25th June 2020, 16:44 | #23 |
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Rover 75 Contemporary SE 2.0 Diesel Auto 2005 Facelift Join Date: Dec 2010
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Made that plate some time in the 70's when I was an apprentice.
That thumb, what you can't see is my hand shaking as I was pushing as had as I could. Although if I had tried that when that plate was new I'm sure I could have pushed it over more . Why did my wife see the 'c r a p' on the bench, but you only saw the plate This is where the rubber has split, from the same photo as above .
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25th June 2020, 19:12 | #24 |
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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
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26th June 2020, 06:30 | #25 |
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@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 | #26 |
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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. |
26th June 2020, 09:17 | #27 | |
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Quote:
My garage is FULL of useful stuff, that's why the car is on the drive There is the start of a 3rd row of holes, sorry but they are ALL metric in that plate, which was fortunate as the studs are M12 SteveN
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26th June 2020, 09:31 | #28 |
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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
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26th June 2020, 10:51 | #29 | |
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Quote:
Sent from my SM-A600FN using Tapatalk
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26th June 2020, 11:09 | #30 | |
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Quote:
I drained both a used diesel one, and one from a V6, and measured the viscosity in Redwood seconds (can't lay my hands on the figures at the moment) however fluid recovered from the diesel one was considerably more viscous than that of the petrol at 21 degrees C The top and bottom of the matter is simple, if an item is cheap, even if it looks the part, this doesn't ensure that it's fit for purpose. The V6 mount although dimensionally identical to the diesel one, the one which I fitted prior to the purchase of a genuine Rover diesel mount from XPart, transmitted huge amounts of vibration in comparison to the correct part that was removed. In the case of all of the mounts, two were original factory fit, none of which were Chinese manufacture, none made a sloshing noise when shaken. I'm fairly certain that if there were air present inside the unit, this would be detrimental to the operation, air being compressible, and fluid not so, the damping action of the mount being compromised as a result. Personally speaking I wouldn't fit the mount as supplied, instead I would source one from XPart, and know that at least the supplier had been subject to some form of objective scrutiny Brian |
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