What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[gooffeyguy]

Replaced the power steering pump and reservoir. Replaced the lines recently, hoping that would end the seeping/leaking, but the cast iron pump body seemed to be magically seeping fluid through its pores.

Old:
View attachment 431158View attachment 431159

New:
View attachment 431160

Ignore the heavy patina on everything else.

My power steering reservoir has looked rusty brown for years. I've been spraying it down with fluid film for the last 3-4 years every oil change. One of the lines looks like it's seeping around the rubber transition and I plan on replacing it. I wonder if I should replace the entire pump/reservoir while I'm at it.

 

[Charlie207]

My power steering reservoir has looked rusty brown for years. I've been spraying it down with fluid film for the last 3-4 years every oil change. One of the lines looks like it's seeping around the rubber transition and I plan on replacing it. I wonder if I should replace the entire pump/reservoir while I'm at it.

Mine looked terrible for a while, and I only took action to replace it after doing everything else (new clamps, then new lines, then closing my eyes for a while) until it was making a lot of noise and still leaking. If you have the time and $$$, there's really no reason not to do it all at once.

I'll be swapping the accessory bracket with both the alternator and PS pump onto my 6.0 swap (whenever that happens) so it made sense to have all new stuff.

 

[j91z28d1]

got my warranty refund from the mishimoto headlight return. over all painless return.

will see how this set holds up. if needed ill warranty them out again before the 5 year mark

 

[Charlie207]

got my warranty refund from the mishimoto headlight return. over all painless return.

will see how this set holds up. if needed ill warranty them out again before the 5 year mark

What was wrong with them?

 

[j91z28d1]

What was wrong with them?

sun ate the lenses up.

2 years in the tx son they looked pretty bad

 

[Charlie207]

Man, it's been a busy day...

Oil pump return bracket thing showed up, so that went on. I added a squirt of blue thread-locker, because I couldn't find a 4mm hex-socket to torque the screw down. I guessed, and heard it "click" in my head, so I left it at that. Then the front cover went on, but it gripped the alignment tool a little too well. Luckily I still had a set of these rubber strap wrenches from tightening oddball AR-15 barrel nuts, and that worked. Then the harmonic balancer went on part way with heat, then the rest with the old bolt. Finished it off with 235lb/ft. of ARP goodness.

Literally the only reason I bought a new torque wrench (or two).

 

[Doubeleive]

apparently my truck doesn't want to act up at the shop were doing plugs and send it............
wtf? I did get it kinda hot coming back out of the mountains over the weekend maybe that was enough to throw it out whack or maybe when i did the crank relearn it corrected something (i did that because it was showing misfires all over), beats me. at least it's not a lifter job at the moment anyway

 

[Charlie207]

apparently my truck doesn't want to act up at the shop were doing plugs and send it............
wtf? I did get it kinda hot coming back out of the mountains over the weekend maybe that was enough to throw it out whack or maybe when i did the crank relearn it corrected something (i did that because it was showing misfires all over), beats me. at least it's not a lifter job at the moment anyway

Did you just throw in 8 new plugs, and call it a day?

 

[89Suburban]

apparently my truck doesn't want to act up at the shop were doing plugs and send it............
wtf? I did get it kinda hot coming back out of the mountains over the weekend maybe that was enough to throw it out whack or maybe when i did the crank relearn it corrected something (i did that because it was showing misfires all over), beats me. at least it's not a lifter job at the moment anyway

Never fails

 

[RooTBeeRthe1st]

I'm as naive about A/C issues as anyone, so no help there....

But, just start tearing the LC9 apart. It's easy to send the block, rotating assembly, and heads to the machine shop to have them inspected. It's either good or it's not, and it's probably good as long as it was never oil-starved. The factory bearings (minus the cam bearings for some reason, per my machinist) are incredibly robust, and the last seven LS engines he's worked over didn't need new main or con-rod bearings. Just slap in some new cam bearings and a set of stock piston rings (he recommended Hastings). Do a little at a time, and in a year you'll have a fresh engine to plop into your car.

Aside from time and space to do it, been slowly getting the funds together too, working some O.T. lately. So I'm getting there.
Already have a BTR camshaft and AFM/DOD delete, ls7 lifters and buckets, ls6 valve springs(I think), pushrods, Whipple s/c kit and I think a few other things like h2 motor mounts, new heater hoses & plastic "y's"...bought a long time ago, stockers have made it to 190,000. Although my brain says get the metal ones and never worry again, probably just use what I have already.

Looking at doing the trunnion bearing upgrade and probably new rockers just because majority of the engine will be fresh already, also would like an ati damper, more shopping to be done.

Unfortunately, I need to source a fuel pump set up that will support e85 with the supercharger...whipple says 91+ octane only...and I hate gas at this point. Go out of my way for Corn despite the mush worse MPG.

 

[Fless]

Did you just throw in 8 new plugs, and call it a day?

^^^ This. It sure needed those for starters.

 

[Doubeleive]

Did you just throw in 8 new plugs, and call it a day?

yep so far, did another crank relearn afterwards just to cinch it up, now I just gotta drive it and see what happens I will give it some drive cycles and check the data again
see if the cat passes or not. after 10-15 miles it just shows evap and cat need to set. if the cat won't pass I have the file from blackbear to turn the code off.

 

[j91z28d1]

Man, it's been a busy day...

Oil pump return bracket thing showed up, so that went on. I added a squirt of blue thread-locker, because I couldn't find a 4mm hex-socket to torque the screw down. I guessed, and heard it "click" in my head, so I left it at that. Then the front cover went on, but it gripped the alignment tool a little too well. Luckily I still had a set of these rubber strap wrenches from tightening oddball AR-15 barrel nuts, and that worked. Then the harmonic balancer went on part way with heat, then the rest with the old bolt. Finished it off with 235lb/ft. of ARP goodness.

View attachment 431163View attachment 431164View attachment 431165

Literally the only reason I bought a new torque wrench (or two).
View attachment 431166

your build makes me want to build an engine lol.

 

[Charlie207]

your build makes me want to build an engine lol.

It's been fun, other than the cost, but the big hurdle is going to be the actual swap. No garage, gravel driveway, and it's my DD. Going to take a logistical miracle.

That being said there are so many used LS engines for sale you'd be in a good spot to set up some alerts for what you want, and just make an offer on one.

 

[j91z28d1]

It's been fun, other than the cost, but the big hurdle is going to be the actual swap. No garage, gravel driveway, and it's my DD. Going to take a logistical miracle.

That being said there are so many used LS engines for sale you'd be in a good spot to set up some alerts for what you want, and just make an offer on one.

I have hopes my yukon 6.0 lasts a long time as it is, and I have spare cars if not, so that helps. that one hopefully stays in place for a while. it's more the transmission that would side line it. I think I can fix anything on it except that magical box.

but you got me wishing it wasn't such a pain to pull the ls3 from my c6. I have wanted to drop a stroker crank in it and a small cam with some new cam bearings in it for a few years now. it just hasn't given me the excuse to pull it or drop it or whatever is the easiest without a lift. those things suck to work on. 10lbs of crap stuffed in a 5lb bag. but your build makes me want to lol.


I hope you get her in there smoothly. I remember the days of being young and trying to race my only car haha. melt a piston at the track on Thursday night and try to get it back together for work on Monday morning. working outside in my mom's back yard lol. good times.

 

[Charlie207]

My favorite is when you forget to install a part because it was sitting in a box, inside another box, out of sight.... in this case the timing chain dampener. So off came the harmonic balancer, timing cover, oil pump & pickup tube, and timing chain & sprocket.

Added the part and buttoned it all back up while the workgroup VP rambled on in a Teams call about how we continue to set records, but that we also need to do more. He's definitely in touch with the shareholder's expectations. At least I'm getting paid to learn a new hobby. New progress was finally getting the oil pan & gasket installed, while explaining to the kids about how it's a big-brain move to replace your engine with one you've assembled in your basement before the one in your car expires.

Also emailed BBP about the logistics of getting a 6.0 tune to get this thing eventually firing/idling/running, and whether the LY6 or LMG injectors I have will be sufficient for a Truck Norris clone cam. (god I hope so)

 

[donjetman]

was thinking you might be good at reading plugs from the drag racing days.

any thought on the plugs above? see anything that might cause a misfire?

we don't see anything like that on plugs I've read?????
sorry

 

[j91z28d1]

we don't see anything like that on plugs I've read?????
sorry

ahh. I thought you might know what the brown specks were.

I honestly think the plug is either to hot or to much timing in the tune and it ate the plugs. but it sounds like it's driven hard and has a lot of miles on the plugs. once you start racing around the plugs become a maintenance item changed more often and a way to keep an eye on the tune and how the engine is doing.

 

[Doubeleive]

ahh. I thought you might know what the brown specks were.

I honestly think the plug is either to hot or to much timing in the tune and it ate the plugs. but it sounds like it's driven hard and has a lot of miles on the plugs. once you start racing around the plugs become a maintenance item changed more often and a way to keep an eye on the tune and how the engine is doing.

those plugs had maybe 50k on them, but yes driven hard. still need to connect with blackbear and then wait for a response or fix. little busy myself but i'll get there

 

[j91z28d1]

those plugs had maybe 50k on them, but yes driven hard. still need to connect with blackbear and then wait for a response or fix. little busy myself but i'll get there

oh yeah. I'm just thinking out loud.

I do hope black bear has some thought. they may also just think 50k they did well for that.

it's pretty common in the ls performance car world to just throw 1 step colder heat range than stock in them. you. probably drive your heavy suv harder than most drive their cars haha