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Anybody have one go ? If so what were the symptoms ? I think that's what's wrong with my
02 Sierra hd
0 at start up then 20lbs a min later
Goes up with rpm slightly
Motor is quiet . Did the o ring , same ****
This is with a mechanical gauge .
Doesn't matter too much if you "did" it, especially not if it had the wrong one before, and you put the same one back in.
A little history, besides "did the O-ring", might help. Like, has this engine EVER had proper oil pressure; or, is this a fresh build, and it started up this way.
Probably not the relief valve. They do in fact stick open sometimes; symptoms of that tend to be more like very low OP at startup, then as the oil warms up and thins out, pressure goes to dead zero, about the same time that the bearings spin.
Motor has been in truck for 5 years . Was a 50k motor so prob 150-175k . Always great oil pressure . This is new . Changed oil , sending unit , tested mechanical gauge . Has better pressure @ left side port . 17. @idle will go up to 60-70 with rpm . Went to dealer got orange/red o ring ( what they gave me According to vin of motor )
Tube has groove . Put it on pick up tube with some Vaseline and it popped in . First start up this morn , immediate oil pressure 20lbs . Drove it home last night . Had 20-25 all the way home but will drop to 0 @ idle
sometimes . Other times it will hold . Part number of seal is. 12584922. Motor is an 03 lq4. Always run Mobil 1 with a wix filter . I hope it’s the pump . Only thing that makes sense . I’m going to change Thursday when it gets here . Any tips or tricks , please share . Also , yesterday changed oil , filter again with Mobil 1 15/50 and Mobil 1 filter . Seemed to help slightly but took forever to come up . But now it seems to hold prime.
If that was the THICK O-ring (color notwithstanding... color has caused more left turns off the pavement, down the gravel road, onto the dirt path, into the weeds, through the fence, and into the lake, than probably any one other thing about O-rings in the history of O-rings), then it's probably fine
DIMENSIONS are what matters. Color and "dealer" are totally incidental. AFAIK "VIN" is no help in this matter. I doubt the factory kept records down to that level of granularity, considering the randomness that people have reported about which pickup tube type they have.
You might just have a gauge problem, especially if the motor isn't in low-oil-pressure distress when the gauge reads 0.
If you want to see where the oil is leaking, pull oil pan. Put a catch tray underneath block. Block off the oil pickup and ports to oil filter. Pump 20psi pressurized oil into the front oil galley (M14 x 1.5 adapter) and see if the oil pump relief valve or pickup tube/O ring is leaking. Pressurize the rear port to see what's going through the lifters and bearings. If you haven't yet, take a peak up into the cam journals to see if any cam bearing have walked out.
Well it’s been keeping prime since I put the 15/50 in it . Has 10-15 lbs @ idle and goes up with rpm . It will hit 35 lbs @ maybe 3500/4K taking off .
ordered a new oil pump , timimg cover set etc. I fig if I have to take it apart again I might as well do the pump . Pretty sure I used the right o ring . It was the same size as the one I took out , but was still round . The edges were squared off on the old one . It’s either the pump or maybe it walked a cam bearing either way , if the pump don’t fix it I’ll drive it till it dies and put a motor in it . I’ve researched everything I could find on the o ring and oil pump install , priming etc... i still have an oil primer I made out of a garden sprayer from when I built my car . When I put a mechanical gauge on the left side port , it only had 17lbs @Idle , but would hit 60-70 @ 35-4K if it walked a cam bearing , shouldn’t it have been higher ? basicly coming right off the pump .
If you don't pressure check then you won't really know what's going on. What pump did you buy? Are you going to disassemble new pump, deburr, port and verify relief valve floats freely in bore?
Google LS oil system diagram to see how oil flows. From pump, through filter, up to pressure sensor, then routed to lifters, cam and mains.
Don't forget also, if you're not using an oil cooler, then there's that little bypass piece on the side of the oil pan, that all the oil has to pass through. If that's where you put your mech gauge fitting, check VERY CAREFULLY to make sure that the pipe fitting for it, doesn't block off the passage through that thing. Re. the flow through the motor, it's after the filter, and before the pressure sending unit.
I just bought a melling standard pressure pump
295? . It in an 02 hd crew cab . Has factory oil cooler . Watched all the melling videos on install
And priming , seal etc... last one I did came out fine so I'm not to worried . I'll have it apart sat
I'll let u know .
Got the new pump . Tried taking relief valve out . It moves freely but won’t come all the way out .looks like they oil the chamber so they must check them ?
Well ,put pump in . It’s basicly the same . Maybe 3-4 lbs more pressure . Looks like a cam bearing walked out . It’s still drivable . Gonna get another motor, drive it till she starts rapping.
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Oil pump relief valve 
