Coming home this afternoon, I had to get around a slow poke in the fast lane and mashed it, I heard a strange, kinda like a squeel coming from under the hood. So going up the hill toward home, I mashed the pedal slow and steady until I heard it again, it started at about 22 psi and got a little louder all the way up to 29 psi. I've never heard this before, and just normal driving, say under 20-22 psi, it doesn't do it, atleast to where I can hear it, anybody got any ideas, could the turbine be fixing to buy the farm. It was raining when I got home, so I didn't remove the inlet hose and check the shaft play, maybe tomorrow at the shop.

 

Check for boost and exhaust leaks also, they can make squealing noises.

 

Sounds like a boost leak. Check the boot on the passenger side at the intercooler closely. That is the one that seems to give the most problems.
Tom

 

Thanks, I'll check the boots in the morning, I hope it's not the turbo, because of what we just paid out in taxes, but deep down, I DO, then I could say "well baby, the turbo in the truck just bought the farm, ya know those factory parts don't hold up very well" and then buy a GOOD one , but then I'd just wind up tearing out the tranny again and spending more money , ah heck, I'll start looking for one now, GONE SHOPPING

 

One thing you should do while you are in there is pull the intake hose off and wiggle the turbine to see how much play is in there. I was reading this article Encogod posted about in Gen Diesel and it said weird noises from the turbo point to a failing turbo.
Not trying to have a bleak outlook, just a real one.

Chris

 

Thanks Stamey, I was going to do that in the morning anyway. I've been looking at sites to get a new compressor end and reading up on failures and what to look for when they start going south. One site said something about oil smoke out the tail pipe and talked about the seal going out and bearings going bad. It does smoke, slight blue when it's cold, but if I put the factory injectors back in, it quits, so I'm figuring it's just unburned fuel and being cold. Once it's good and hot, their is still a haze, but it's not blue. There was one time I forgot to plug it up at night, temp went down to about 15* and it smoked like a tar kettle after it cranked. I'm just wondering it Cummins sells the new boots or maybe Napa as they would be closer to the shop.
What I was sitting here thinking about is HOW to check the boots without taking all the piping loose and removing them. If it's just a tiny pin hole or small slit, at idle, you won't be able to tell it's there. I'd thought about rapping them real tight with electrical tape and run it down the road, no squeel=leaking boot, still squeeling=back to the drawing board. Hey, it beats bailing wire and duct tape

 

The way I check for leaks is with a 4'' rubber hose clamp type drainpipe coupling with a 4'' pipe and cap on one end, connect the other end to the turbo inlet. The cap has a tire valve and pressure gauge tapped in. Just pressurize, listen or use soapy water to find the leak. The lower intercooler boot seems to be the one that fails most. At high boost it expands and can rub against a sharp edge on the inner fender.

Doubt if Napa can help you with boots. Don't waste your money on boots from Cummins, get heavy duty ones from Piers for cheaper. http://www.piersdiesel.com/DodgeProducts.htm

 

PumpDaddy;
Ditto;
Doubt if Napa can help you with boots. Don't waste your money on boots from Cummins, get heavy duty ones from Piers for cheaper. http://www.piersdiesel.com/DodgeProducts.htm
ramguy

 

I got Pier's booties on mine. they are a PIA to get on.

 

Aerosol silicone spray inside the boots is the trick to getting them on.
Still a PITA though.

 

Hairspray works great too.

Slippery when wet, sticky when dry.

Helps keep them in place as well.


phox

 

I pullled the inlet hose off today and as far as "play", there is no axial play, but I can feel a little bit of up and down, but stop and consider how hot these things get, there would have to be enough to "feel" to keep the bearings from siezing up at the high temps. On the bigger pumps we build, we set the cup to cone clearance at .0000 @ 300*, so when they cool down, we have about .001-.0015, but these bearings never see over 125*. I could see no scrubbing marks on the inside to indicate the shaft had dropped any. It turned free and spun good. I think I'll take the hose off at the first boot, and last boot and make some couplings with air chuck and pressure guage to test. We install the rings on the O.D. of some of our parts with .015-020 shrink, so you have to "warm" them up a bit to get them on, and the same for the I.D. rings, but we use liquid nitrogen to freeze them so they drop in the hole, and that stuff is COLD. So I would think that the thermal expansion of the turbo would be in the crazy zone.
I don't think it's the turbo, but since momma wants to go to the gulf on Friday and take a few days off, I may not know for sure until next week, but it has has no problem building boost, just that dang funny squeel noise after 22 psi