How tight to make outside nozzles?

Clay · 03-19-2008

I finished the install of my DO kit tonight, and was wondering how tight to make the outside nozzle? It never tightens before it hits the o-ring, then if I continue to tighten it down, the o-ring will squeeze out. So I made a recess in my mounting boss to keep the o-ring in place. I can never get the nozzle to not move a little. Basically to keep the o-ring from being torn to shreds, the nozzle has to say a little loose. I mean its not flopping around or anything, but if I grab the check valve I can move the nozzle a little. Is this OK????? Im used to pipe fittings with lots of thread where you can just tighten them until you cant put anymore on it. So I just want to make sure Im not going to have a huge boost leak. Should I remove the o-ring and just use sealant? thanks, clay

Rocket468 · 03-19-2008

With most NPt threads you should be able to get the threads 1/4 engaged by hand and 3/4 is usually max when tightening to the point you feel something is going to give. The O ring is mainly there for people who remove and replace the nozzle freq. Your right you should not tighten the nozzle so tight the O ring explodes.

With the nozzle holder and check valve attached you should not tug to hard on it, as you can snap the nozzle. the lenght of the check vavle adds over 2" of leverage to it. It should not have so wiggle with just grasphing the nozzle and holder.

Clay · 03-20-2008

Well thats what I figured. Looks like the o-ring is coming off and Ill put it back with a dab of sealant. thanks, clay

03-19-2008	#1 (permalink)
Clay Water Injection Newb Year: 1986 Make: Dodge Model: Omni GLH-T Join Date: Mar 2008 Posts: 6	How tight to make outside nozzles? I finished the install of my DO kit tonight, and was wondering how tight to make the outside nozzle? It never tightens before it hits the o-ring, then if I continue to tighten it down, the o-ring will squeeze out. So I made a recess in my mounting boss to keep the o-ring in place. I can never get the nozzle to not move a little. Basically to keep the o-ring from being torn to shreds, the nozzle has to say a little loose. I mean its not flopping around or anything, but if I grab the check valve I can move the nozzle a little. Is this OK????? Im used to pipe fittings with lots of thread where you can just tighten them until you cant put anymore on it. So I just want to make sure Im not going to have a huge boost leak. Should I remove the o-ring and just use sealant? thanks, clay

03-19-2008	#2 (permalink)
Rocket468 DevilsOwn Staff Year: 2000 Make: Pontiac Model: Grand Prix Join Date: Apr 2005 Posts: 1,073	Re: How tight to make outside nozzles? With most NPt threads you should be able to get the threads 1/4 engaged by hand and 3/4 is usually max when tightening to the point you feel something is going to give. The O ring is mainly there for people who remove and replace the nozzle freq. Your right you should not tighten the nozzle so tight the O ring explodes. With the nozzle holder and check valve attached you should not tug to hard on it, as you can snap the nozzle. the lenght of the check vavle adds over 2" of leverage to it. It should not have so wiggle with just grasphing the nozzle and holder.

03-20-2008	#3 (permalink)
Clay Water Injection Newb Year: 1986 Make: Dodge Model: Omni GLH-T Join Date: Mar 2008 Posts: 6	Re: How tight to make outside nozzles? Well thats what I figured. Looks like the o-ring is coming off and Ill put it back with a dab of sealant. thanks, clay