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Boris Siljanoski
Western Australia
Soarer GZ20 TT

Posts: 39
Reg: 11-2007

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Sunday, December 20, 2009 - 05:31 pm, by:  Boris Siljanoski (Z2tt)


Yes it is the EPR (Evaporator Pressure Regulator) valve, or also called STV (Suction Throttling Valve).

It's a common problem for these to leak, I've head one leak in my z20. Unfortunately I'm not sure exactly how to go about overhauling it.

Some people have drilled the screwholes out and used bolts in order to get better clamping, which can reduce leaks.

Other people have pressed theirs on a clamp, which reduces the leak.

Some people have said that disassembling and re-assembling it fixed the leak.

When I had a leaky EPR, I began looking for Neoprene or HNBR sheets about 0.7 to 1mm thick, so I could make a gasket to go around the outer bit to stop the leak.

Your best bet would be to find a place that sells Neoprene or HNBR Sheets that are about 1mm or 0.7mm thick and make your own gasket.

Sometimes the screws can be extremely hard to remove so make sure you use a good screwdriver.

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