Craig,
Testing it is pretty easy. The only cap you need to get off is the large one. I use a visegrip, locking the jaw around the circumference of the cap. Don't lock the jaws too tight, rap the end of the visegrips lightly with a rubber mallet. One soft rap should loosen the cover. Once the cover is off, you can slide the valve out of the unit. Before dropping the valve into boiling water, note the valve opening. Drop the valve into the water, wait a minute, use tongs to grab the valve out of the water. You should see the piston in a new position.
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Dave
'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P
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