HELP! q-jet air-valve assy binding... (lars?)
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Melting Slicks
Joined: Feb 2000
Posts: 3,052
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From: Vancouver BC, Canada
HELP! q-jet air-valve assy binding... (lars?)
i think i've discovered my poor WOT performance. the secondary air valve is not snapping shut, nor is it easy to open. to seems to bind when closing at about 25%, and will stick at wide-open too.
i can't see any phyical contact between the vavles and the air horn -there is clearance all the way around them. also, linkage is not the source, because the air horn is removed from carb and it still binds. can the shaft be the problem? bent? debris? how to remove? can it be lubed? i hope the air horn casting is not warped -i've been careful to never overtighten... :confused:
i can't see any phyical contact between the vavles and the air horn -there is clearance all the way around them. also, linkage is not the source, because the air horn is removed from carb and it still binds. can the shaft be the problem? bent? debris? how to remove? can it be lubed? i hope the air horn casting is not warped -i've been careful to never overtighten... :confused:
Le Mans Master
Joined: Mar 1999
Posts: 6,744
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From: delmont pa
Cruise-In I Veteran
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Re: HELP! q-jet air-valve assy binding... (Turbo-Jet)
loosen the screws on the air valve and see what happens. also back off the return spring adjustment and if this frees it it up the spring has been over tightened and distorted :chevy
Thread Starter
Melting Slicks
Joined: Feb 2000
Posts: 3,052
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From: Vancouver BC, Canada
Re: HELP! q-jet air-valve assy binding... (clem zahrobsky)
loosen the screws on the air valve and see what happens. also back off the return spring adjustment and if this frees it it up the spring has been over tightened and distorted :chevy
To me, this could appear to be a common problem with original Q-jets, yet I have never heard of the shaft binding before. Is there a better fix?
PS-
Is Loctite 242 an acceptable means to secure the air valve screws to the shaft instead of peening-over?
Melting Slicks
Joined: Jul 2002
Posts: 3,128
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From: Deltona (son of Deland and DAYTONA) FL
Re: HELP! q-jet air-valve assy binding... (Turbo-Jet)
Mine seem to stick closed a little if I tap the flaps from above with my finger. If I rotate the shaft there seems to be no sticking.
Le Mans Master
Joined: Mar 1999
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From: delmont pa
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Re: HELP! q-jet air-valve assy binding... (Turbo-Jet)
these tops get distorted because someone tightens down on the top to main body screws and the air cleaner bolt too much and causes these problems. loc-tite will work fine just make sure that the parts are clean. :chevy
Le Mans Master
Joined: Mar 1999
Posts: 6,744
Likes: 1
From: delmont pa
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Re: HELP! q-jet air-valve assy binding... (isosceles)
check to make sure that where the 2 long screws that hold on the top at the rear of the carb have not been tighten down so much that the top is squeezed in around the bolt heads binding up the butterflys. :chevy
