Pressure Tester (was Surging and erratic boost
pjrose at frontiernet.net
Wed Jan 3 12:37:51 EST 2007
At 8:24 AM -0800 1/3/07, Bernie Benz wrote:
>Your original Q related to a check valve that might prevent
>crankcase pressurization and resulting dip stick ejection. The check
>valve you point out will not do so.
Ah, so this check valve is evidently oriented so as to prevent
pressurized flow from the IM to the crankcase only during normal
boost(ed) operation. Thus does not prevent crankcase pressurization
during the pressure-test procedure, which applies pressure/flow to
the turbo intake boot (and provides a path to crankcase via the
breather hose). I get it now.
Anyway, I never managed to "blow my dipstick" (pardon the expression)
because I used a bike pump which was able to reveal source of leak
using relatively low pressure. Also, I long ago replaced the aging
o-rings on the dipstick with new ones (3/16" ID ; 5/16" OD fits
well), which might help a little.
Phil Rose.....Rochester, NY USA
'06 A3q 3.2 V6 (5K, silver)
'91 200q (156K, Lago blue)
'91 200q (70K, Tornado red)
'89 100 (Bamboo gold)
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