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  #1  
Old 07-11-2008, 04:38 PM
Mark Rinker's Avatar
Mark Rinker Mark Rinker is offline
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Default Turbo issue - 2004 LB7 with 97K miles

On my way home with unloaded trailer from Seattle to Minneapolis, started to hear a faint squeal similar to a belt slipping, when under acceleration.

Checked belt/tensioner - no problems. Finally on a steep downgrade I engaged the exhaust brake (not normally used when empty) and the squeal was constant and definately boost related...

With doghouse removed, the squall is unbearably loud. Turbo is functioning normally under moderate throttle but noise occurs under acceleration and activation of exhaust brake. Power and mileage normal, no black smoke even under heavy acceleration with squeal present.

Not sure if its a bad turbo to intake seal or a bad wastegate, but the truck is going in Monday to get it addressed - a smidge under warranty expiration.
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2011 Chevrolet Tahoe 5.3L daily driver
  • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
  • Total GM diesel miles to date : ~950K
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  #2  
Old 07-14-2008, 07:55 AM
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Duramaster Duramaster is offline
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Hey Mark! Just saw your post on the turbocharger. Sounds to me like it is a burned out exhaust manifold gasket. Use this tool http://www.sears.com/shc/s/p_10153_12605_00945164000P Take the probe end off so that you just have the hose attachment on. Trace the hose around the exhaust manifolds and turbo area. Anywhere there is an exhaust sealing area. Good luck with that.
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1998 Chevy k-2500 454 147,000 miles and climbing!

1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!
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  #3  
Old 07-14-2008, 07:37 PM
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Mark Rinker Mark Rinker is offline
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It was a seal - as you guessed. They stripped or broke a bolt when disassembling, a new tube/gasket are on order. Warrany will cover the fix.
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2011 Chevrolet Tahoe 5.3L daily driver
  • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
  • Total GM diesel miles to date : ~950K
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  #4  
Old 07-15-2008, 06:08 AM
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Duramaster Duramaster is offline
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Cool! Hopefully it's not broke down for too long.
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1998 Chevy k-2500 454 147,000 miles and climbing!

1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!
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  #5  
Old 07-15-2008, 07:13 AM
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Mark Rinker Mark Rinker is offline
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Me too - we are trying to get out of town with a boat today or tomorrow...back to Seattle.
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2011 Chevrolet Tahoe 5.3L daily driver
  • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
  • Total GM diesel miles to date : ~950K
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  #6  
Old 07-15-2008, 08:16 PM
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Mark Rinker Mark Rinker is offline
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They fixed the leak mentioned in previous post, only to discover another at the exhaust manifold. Both are now corrected.

Also addressed a small oil leak on drivers side of block. Said it was a block plug (?) that needed resealing - not the oil fill or dipstick tube that I had suspected.

My last smidge of warranty will run out on the next trip to Seattle - so I guess this is the end of the road for cheap fixes. (Although GM extended the injector warranty to 200K and put it in writing shortly after replacing all 8...)

$105.
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2011 Chevrolet Tahoe 5.3L daily driver
  • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
  • Total GM diesel miles to date : ~950K
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  #7  
Old 07-15-2008, 08:34 PM
AKMark AKMark is offline
Building another 6.2L powered vehicle
 
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Lucky you, all my problems happen after warranty is long expired.

I no longer buy vehicles with warranties, much cheaper to buy, and I learn how to fix myself. When they break away from home, you are up a creek, but that's the way it goes. I don't own a business like you do, so I can get away with it a little easier.
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05 2500HD CC LB LLY, 4x4, 3.73s 235/85R16's, webasto cab heater, to keep it warm.
03 Buick Rendezvous - When you average over 80 miles per day driving around, you need one of these.
85 K-5, 6.2, SM465, Rockwell T221, 1 tons, 36's. More goodies to be installed as time and money allows.
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