robp823 Posted December 22, 2009 Share Posted December 22, 2009 Has anyone ever actually had any branch tube failures.I have an 05 in my bay right now will only build up to 400 icp.Standpipe and dummy plug o-rings look ok except for one dummy plug 0-ring has started to get deteriorated, ipr has been replaced now im just down to branch tubes, stc, or pump.Im going after the stc next.Just curious though because the air i hear leaking doesnt sound like its coming from stc it sounds like its coming from down in the valley where the branch tubes sit. Quote Link to comment Share on other sites More sharing options...
GregKneupper Posted December 22, 2009 Share Posted December 22, 2009 I have personally seen only 4 of them break. More than likely you just have a bad stc fitting though. If the branch tube does happen to be cracked though it is because the stc fitting has failed and bent the crap out of it. Quote Link to comment Share on other sites More sharing options...
robp823 Posted December 23, 2009 Author Share Posted December 23, 2009 got the stc fitting out and it seems pretty tight.Could it still be a failed part without and signs of damage? Quote Link to comment Share on other sites More sharing options...
Mikill Posted December 23, 2009 Share Posted December 23, 2009 got the stc fitting out and it seems pretty tight.Could it still be a failed part without and signs of damage? An air test with the cover off would show if the stc fitting is leaking. If it's leaking you will see it even if it's a small leak. I personally have only seen one branch tube cracked. Not fun at all to replace. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted December 23, 2009 Share Posted December 23, 2009 I have only seen two bad branch tubes in my shop. Both were completely cracked with one branch completely separated. Quote Link to comment Share on other sites More sharing options...
robp823 Posted December 23, 2009 Author Share Posted December 23, 2009 well once i got the cover off and the pump out there is a huge indintation of wear the stc wacked off the back off the rear engine cover. Quote Link to comment Share on other sites More sharing options...
Aaron Posted December 23, 2009 Share Posted December 23, 2009 I have had several with the cover with a witness mark from the STC fitting coming apart -- little tweak of the branch tube and back together. Quote Link to comment Share on other sites More sharing options...
mchan68 Posted December 23, 2009 Share Posted December 23, 2009 I have had several with the cover with a witness mark from the STC fitting coming apart -- little tweak of the branch tube and back together.I agree. Aaron and Jim just have a better way of putting my thoughts into words. Sometimes, it's hard to express it in English, as opposed to MY way of expressing it, which is "Ch-English" . Quote Link to comment Share on other sites More sharing options...
jw33 Posted December 23, 2009 Share Posted December 23, 2009 tried tweaking the branch tube once, made it 2 miles on the test drive and quit running, so now if there bent they get replaced, dont mind doing them now Quote Link to comment Share on other sites More sharing options...
robp823 Posted December 23, 2009 Author Share Posted December 23, 2009 yea i think im putting a branch tube assembly in just to be safe.One other question there shouldnt be any play on an stc fitting correct? Quote Link to comment Share on other sites More sharing options...
Aaron Posted December 23, 2009 Share Posted December 23, 2009 You're gonna have a little movement in it on the bench, at least any of the ones I've seen. Any time I've had the HPOP cover off and had any sort of hotline involvement I have been instructed to replace the STC fitting with the updated 1-piece fitting. Quote Link to comment Share on other sites More sharing options...
robp823 Posted December 23, 2009 Author Share Posted December 23, 2009 yea i have another ambulance apart now.Comparing the one from the f250 and the ambulance ones not much better than the other there is a ton of side to side slop. Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted December 24, 2009 Share Posted December 24, 2009 Who cares how much or if any play is in the STC fitting. If it's not the updated design, replace it! Quote Link to comment Share on other sites More sharing options...
robp823 Posted December 24, 2009 Author Share Posted December 24, 2009 i just wanted to know for piece of mind Quote Link to comment Share on other sites More sharing options...
GregH Posted December 24, 2009 Share Posted December 24, 2009 ... Standpipe and dummy plug o-rings look ok except for one dummy plug 0-ring has started to get deteriorated ... the air i hear leaking doesnt sound like its coming from stc it sounds like its coming from down in the valley where the branch tubes sit. Did you pull the standpipes all the way out? Did the lower o-ring look ok where it sits in the branch tube? How about the o-ring sealing the two halves of the standpipes? Another source of air leak is through the IPR. If the shop is quiet, then you will still hear air through the IPR when it is fully closed. With the cover off, you can feel the air coming out through the hole in the back of the pump, over the gear. With air pressure on it, IPR jumpered closed, and stick your fingertip over the hole in the back of the pump, then all the air leaks should stop. If they do, and the engine won't build pressure, put a pump on it. Make sure to remove the red plastic plug from the bottom of the pump prior to assembly... Quote Link to comment Share on other sites More sharing options...
Aaron Posted December 24, 2009 Share Posted December 24, 2009 Make sure to remove the red plastic plug from the bottom of the pump prior to assembly... Sounds like the voice of experience... Quote Link to comment Share on other sites More sharing options...
robp823 Posted December 24, 2009 Author Share Posted December 24, 2009 Well i did check everything you said but after the dent in the rear cover and the bent branch tubes its getting an stc and branch tubes.thanks though Quote Link to comment Share on other sites More sharing options...
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