Replaced mine 6/11 with a new ACDelco and since then it has made a whirling noise... Don't worry about it
ac delco tig welded from guy. not a whirling noise. more like a gear mesh noise. its gotten quieter, could be a good or bad thing lol
I didnt worry about mine back in the day from dealer replacement under warranty . ... Went back to dealer telling them " Hey wtf is this wirling sound its making ". They said " Its fine ... Drive it " . Then 2 days later the noise and heat related to it made the gear come off shaft . I just happend to be out on the I40 in the middle of nowwhere . I think you guys might recall some threads years back when I ran into this issue . Yes welding it keeps the gear on ... but why the noise . My findings later after 2 more AC pumps with same noise and gear off shaft 2 more times . I found the gears pitch and depth were just a tad different them my original AC ... after saying fluck the dealer . Went to dealer and found my original pump in mechanics stall . Then went looking at other pumps . Found the Napa pumps to be the same as my original and after installing no noise period . I weld mine also now , but use the pumps that have the same gear profile as my original AC did . All the AC's I have looked at have this other profile . Its the same but a hair different and what I believe to cause the noise .
I always love your answer paint ..... dont worry about it . Drive it . :cool2:
I say the same with a understanding of what it might be causing the noise .
I wouldnt worry but be informed of what I think the noise is . I think its the cut on the gear . The welded pump should be fine and the only answer I concluded wouldnt leave me hanging on the side of the road with the gear spinning on the shaft inside timing cover and the temps pegged . Had 3 pumps spin the gear off them before figuring it out . Heat or ( noise ) makes gear grow . Gear is only pressed on shaft . High HP trucks also will spin the gear off but this is a different issue I believe the noise . I have pics of the inside of my block with a quarter size 3/8 deep cut in my block from gear eating block in the past after 3 of them . Why I not only weld mine , but start looking around for pumps at different locations . Went to Napa and in comparison ... found the gear profile to be the same as my original LLY factory pump on thier pumps and started using them and also welding them . I dont get how or why the later pumps had a hair different profile . But the noise sure is gone now . It was easily seen in comparison with your eye right next to each other. Slightly deeper depth on teeth and slightly different angle or pitch on gear .
The Napa pump had the same original profile as my original LLY ..... no noise ! Go figure ... might be on to something here . Hmmm ... is this what the noise is . Im no tech and just a driveway wrench ... old school . I believe a LB7 would run into this same issue if my thinking is spot on . Why anyone with a later LBZ or LMM I would think shouldnt hear a noise . Unless GM has pumps now that just dont meet up with cam gear properly . I dont know or in the end really care . I personally see the difference in gear cut on my original pump in comparison to the AC pumps available . And why I buy Napa pumps . These have the same profile as my original pumps that should have come on my truck . I think GM did something . Not sure . Changed manufactures or went with a supercieded part number believing them to be the same . Not sure or in the end care . Ran into alot of work and side of the road bullshit over this . Either way ... we as consumers have to live with thier mistakes as small as they might be . I have many pics but im full on loading more here and have erased all my worthless pics . If the noise doenst go away and you want to try a different pump I advise a Napa pump .
Just informing you of what I ran into and yours being welded should be fine . :thumb: I felt this was a issue LB7 and LLY guys would run into . Just my thoughts on how or why . ?? :thumb:
