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Suspension Losing Pressure 1 week 3 days ago #200032

Hi,

My MGF has started to lose pressure and sag on its drivers side.
I have pumped to up to spec several times but after a few days it drops.
I have checked for leaks and try as I might , I cannot find any. I have checked all unions for tightness also the schrader.
Odd thing is , it seems more affected by time than use , as I recently completed a 300+ mile drive without much of a drop.
I have pumped it up around 5 times so far so I expect that if the suspension unit diaphragms are damaged the upper chamber would now have been well filled.
I'd really appreciate any useful info on this.

Kindest regards.

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Last edit: Post by David Aiketgate.

Suspension Loseing Pressure 1 week 3 days ago #200033

Just keep pumping. You will soon find the leak. Really, this is not the right answer. If the car is constantlly dropping, there is a leak either into the sphere or out of the sphere. Try dislodging the plastic cover on the knuckle strut and see if there is any moisture. Is one corner hard when you bounce it? If it is then the sphere is flat and continually pumping it up will only do further damage.

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Suspension Loseing Pressure 1 week 2 days ago #200035

Yep, if you had an internal leak in the sphere, the suspension would just end up rock hard on that corner.
David
:shrug:

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Last edit: Post by David Aiketgate.

Suspension Loseing Pressure 1 week 2 days ago #200036

The system is at circa 450 psi so if there is a leak, it really should show itself fairly quickly once pumped up to circa 450psi. If the car is stored in a dry garage, it should show itself on the garage floor (although the fluid does dry fairly quickly). It could be losing fluid at the pipe junctions, pipe to spheres, Schrader valves, or the rubber membrane in the spheres.

PS: In my experience, the pipe connections should never be over-torqued and indeed there is no need as the seals (like aircon seals) are very good. The valves within the Schrader casings (same type as in bicycle wheels) can be replaced (just purchase the tool which is a couple of quid off eBay or a bicycle shop) - sometimes they just need to be tightened.

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Last edit: Post by julianfoulger.

Suspension Loseing Pressure 1 week 1 day ago #200039

Minimax, thanks for the swift reply.
I thought Id ask as Im no expert on these and thought there might be something I'm overlooking that I did nt know about.
The fluid/pressure is obviously going somewhere and as it has been pumped several times, it must be leaking outside the circuit.
Pity they did nt use coil springs and wishbones...

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Suspension Loseing Pressure 1 week 1 day ago #200040

David, thank you for the reply.
What you said makes sense.

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Suspension Loseing Pressure 1 week 1 day ago #200041

Julian,
There is no hard standing at my home , I ll put some dry cardboard underneath to see if I can locate a drip. Each time I pump it to circa 450lbs and when it sags it drops to around 200.
Thanks for the heads up on the tightening of the unions.
I 'll persevere and thanks again to you all.

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Suspension Loseing Pressure 1 week 1 day ago #200042

Heretic! The hydragas suspension is one of the best bits of an MGF. Set up properly, the car corners flat and nimbly while at the same time being comfortable to drive all day long- Think Dieppe to Bordeaux on Routes Nationales. There aren't many sports cars that can do that without beating you up in the process. Now. Remove each wheel in turn on the saggy side and find the rod that connects the upper link to the sphere. You will find a plastic dust excluder that simply pulls free from the bottom of the sphere.pull it free and look at it with a decent torch. The likelihood is that there will be moisture there at one end.(Hint: do the back one first!)

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