Finally found it!

CCer · Dec 14, 2013

I was about a hundred miles from the barn, pulling a full load up the mountain, but had lost power, Cummins 500. Hmmm, poor boost, only 20 psi. I made it to the dealer, he plugged in their computer, not finding anything, told me I needed a new /reman turbo, a variable flow type. At $35-3600. none in stock. This one only had about 30 thousand miles on it. So I went back to the barn, and looked everything over to be sure. I had a few short light runs to make. Next time out, I only had 10 psi boost. Kept watching the pyrometer to keep the temp down. Got back to the barn, Looked it over again, this time it was obvious, a hairline crack around the aluminum compressor housing clamp. Searched the 'net and found a used housing and ordered it. Put some vise-grips across the housing and good to go for a while. If used housing doesnt work out, and I need to spend the big bucks, at least my core will be OK, and I won't be charged for a new housing. Now I'm glad I wasn't in a hurry, hope I've saved some money.

ShadetreeRet · Dec 14, 2013

Sometimes the smaller things are the biggest PITA to locate. But, ain't them Vise Grips great tools!

Texasmark1 · Dec 15, 2013

Boost is one thing, squealing is another. I had a 800 cu in Big Cam 6 Cummins and the turbo started squealing. The truck was over a million miles so I figured the turbo bearings were shot.

Went to the dealer and had the mechanic take a ride with me to verify the source of the noise. "Turbo bearing" was his verdict. Waited half a day to get it (lost revenue) and spent $700 for a new one+ labor. Installed it and still squealed.

Further trouble shooting revealed a small hole somewhere in the circuit, forget just where now, not in the turbo proper. Plugged the hole and no more squeal.

For that kind of money I should have remembered if they took the new one off and reinstalled my old one but I think I left it on considering the age of the truck.

Mark

Finally found it!

CCer

Member

ShadetreeRet

Well-known Member

Texasmark1

Well-known Member

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