|The Hydragas Register- Trade section|
Quick trim height calculator
Thanks to MG PoloRover for providing the image on the right. This shows the suspension at the factory recommended trim height.
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The fluid costs about £20+VAT for five litres, and a pump-up takes about half an hour's labour. I've never actually measured the amount of fluid required for an adjustment but I'd have thought a litre or two would easily cover it. For replacing displacers, the process requires evacuating and refilling, so obviously a greater charge must be made both for labour and fluid. Bear in mind that you're unlikely to make any profit on parts as they will probably be sourced by the customer. Most garages I've spoken to (including our own) charge in the region of £25-£40+VAT as a fixed charge for an adjustment. Individuals often do it for just the cost of the fluid, as a way to meet other enthusiasts. I enquired about it at an ex-Rover dealer and they quoted me £90!
You can't pump-up Hydragas on a two-post lift or anything else that takes the weight off the wheels. On the MGF and BMC 1100/1300, the pump-up points are under the bonnet so can easily be done on the floor. The Metro has pump up points under the back, a four post ramp is ideal although a pit would be fine- you can actually access the rear valves easily enough with the car on the floor, just ahead of the rear wheels. Also, if you get into replacing parts, you'll need a pump with vacuum facility to evacuate the air before pumping up with fluid.
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