What did you do to your NBS GMT800 Tahoe/Yukon Today?

[iamdub]

Yes I installed Melling HV pump. Thinking about running a bottle of engine flush before I drop the oil pan again. My thinking is that will hopefully clear any more sludge from the oil passages that I couldn't manually clean like I cleaned the pan and timing cover. Then change the oil yet again, and clean any crud or sludge off the pickup tube screen ( if any gets on there). Then if I still have low pressure after that, maybe try a bottle of Lucas oil additive. If that works, I'll just drive it with Lucas added at every oil change, and starts saving up for a new engine.

Are you 100% certain that you didn't botch the O-ring install with the new pump (method and O-ring size)?

You could overfill the oil by 1.5-2 quarts and park in a mild nosedive to test.

 

[blueinkd]

Got both belts and all those swapped just now. Just cause. Not sure how old they were but the ac belt looked bad.

 

[ScottyBoy]

Are you 100% certain that you didn't botch the O-ring install with the new pump (method and O-ring size)?

You could overfill the oil by 1.5-2 quarts and park in a mild nosedive to test.

Pump kit actually came with FOUR ( yes 4) O-rings. 3 of them were in the box with the pump, and one was packaged in the box with the pickup tube/screen. The instructions and Melling's own YouTube video said to use the one supied with the tube if the tube comes with one, so that's what I did. I lubed it with a dab if motor oil by sticking my finger in the bottle and then smearing my finger all over the O-Ring. Am I 100% sure I didn't screw it up? No, I obviously can't say that for sure because it's not working properly. But I do plan on dropping thepan again to inspect my work. I just have to wait till my next off day. I'm also debating on running some engine flush before I pull the pan down again. That way if there's any sludge in the oil passages possibly causing issues, then maybe I can get it flushed out.

 

[Rocket Man]

Pump kit actually came with FOUR ( yes 4) O-rings. 3 of them were in the box with the pump, and one was packaged in the box with the pickup tube/screen. The instructions and Melling's own YouTube video said to use the one supied with the tube if the tube comes with one, so that's what I did. I lubed it with a dab if motor oil by sticking my finger in the bottle and then smearing my finger all over the O-Ring. Am I 100% sure I didn't screw it up? No, I obviously can't say that for sure because it's not working properly. But I do plan on dropping thepan again to inspect my work. I just have to wait till my next off day. I'm also debating on running some engine flush before I pull the pan down again. That way if there's any sludge in the oil passages possibly causing issues, then maybe I can get it flushed out.

Did you check the fit of the tube to the pump before you installed the parts? There’s different sizes of o-rings. The tube and pump should fit snugly together and when you go to push the tube up into the pump you should have to wiggle it a bit or at least feel it fitting snug.

 

[Tonyrodz]

Got both belts and all those swapped just now. Just cause. Not sure how old they were but the ac belt looked bad.

What brand did you go with?

 

[blueinkd]

What brand did you go with?

All gates.

 

[blueinkd]

All gates.

I also bought 8 Delco 41-110 iridium plugs. May install them tomorrow. Going to check gap on all of them first tonight. Lower back been asking for attention lately. I don't feel like laying over the hood and make it even worse.

 

[Rocket Man]

I also bought 8 Delco 41-110 iridium plugs. May install them tomorrow. Going to check gap on all of them first tonight. Lower back been asking for attention lately. I don't feel like laying over the hood and make it even worse.

That’s part of the reason I just pull the wheels and fender liners off and do it from underneath. My back hates leaning over the fenders, I pay for it for days afterwards.

 

[blueinkd]

That’s part of the reason I just pull the wheels and fender liners off and do it from underneath. My back hates leaning over the fenders, I pay for it for days afterwards.

I just don't see myself doing all that extra work. I don't have back issues. Just sore from busting butt all day today

 

[Rocket Man]

I just don't see myself doing all that extra work. I don't have back issues. Just sore from busting butt all day today

Meh, I can pull the tires and liners in 20 minutes. So much easier to get to the plugs. I pretty much have to with longtubes though but now that I’ve done it like that I wouldn’t go back.