2018 - TDP's 22nd Anniversary
What's New: | Feature Articles: | Product Reviews: | Member's Area: | Subscribe:
Duramax 6600 Diesel Page | Advertiser's Section | Classified Ads | Photo Album | Diesel Books, GM Licensed T-shirts

Go Back Forums > Chevrolet & GMC 2500HD/3500 Light Trucks > Duramax 6600
Register FAQ Members List Photo Album Mark Forums Read

Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ, LMM & LML engine specific topics.

Thread Tools Display Modes
Old 03-22-2011, 04:37 PM
Bill Brayman Bill Brayman is offline
Join Date: Feb 2011
Location: near Birmingham, AL
Posts: 2
Question LB7 Drivers Side Head Gasket Replacement & Turbo Removal

I have torn down a LB7 diesel on my 2002-Chev K3500 PU for the purpose of replacing all the injectors, injector sleeves, and head gaskets. My source for removal/installation procedures are the 5 factory books/manuals from Chev, the Diesel Page/members/duramax/ LB7 Fuel Injector Replacement Article and the Diesel Page/members/duramax Head Gasket Replacement Article. I have removed all the ducts, hoses, valve covers, etc and the removal of the injectors. I have stumbled into a big problem. The drivers side intake manifold's bolts are inaccessible because of the turbo charger. I have tried to remove the turbo charger but the back bolts are very tight and I can not get a wrench or socket on the 12 sided bolt heads / no room. Also the small flex underside exhaust duct bolts are very difficult to remove.
My question #1: Do I have to remove the engine from the vehicle in order to get to the bolts to remove the turbocharger? The turbo charger is blocking my access to the left & right sides intake manifold bolts which is necessary before removing the head to replace the head gasket...
My question #2: Is it possible to open the turbo charger up (into two pieces) at the 6" dia clamp while unbolting the bottom two bolts holding the duct to remove the turbo and get to the intake manuifold? I have removed the three big bolts that hold down the turbo bottom feet but the turbo does not want to come loose.
Can anyone help me resolve the problem about the removal of the Turbo in order to get to the intake manifolds and final head removal and gasket replacement?
Reply With Quote
Old 03-23-2011, 07:27 AM
Kennedy Kennedy is offline
Long Distance Crew Chief for BMDMAX
Join Date: Mar 2000
Location: Loyal WI US
Posts: 10,591

When doing a project like you are into I prefer to do one of 2 ways:

1) Remove engine and do the job on an engine stand

2) Lift the cab and have complete access to engine using the frame as an engine stand.

It's just no fun when you have to lean over and have suck limited access to bolts and viewing.

To answer your question about splitting the turbo yes I have done this, but it is not easy. The turbo drain bolts are probably the hardest part. I did mine several times to do parts swaps several years back. I took a 12mm wrench and bent about 90 and added an extension handle to get the drain bolts.
Kennedy Diesel-owner
More than just a salesman-I use and test the products that I sell on a daily basis!
Superflow Lie Detector in house
2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
2005 Chev K3500SRW D/A CC Long LT(SOLD)
2007 Chev K2500 Classic EC Short LT (Sold)
2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
2016 GMC K3500SRW D/A CC short LTZ

Custom tuning in house using EFI Live tuning software!
Reply With Quote
Old 03-23-2011, 02:01 PM
More Power's Avatar
More Power More Power is offline
Join Date: Feb 2000
Location: Big Sky Country
Posts: 10,267

The GM service manual indicates the turbo has to come off first, but I've spoken to GM mechanics who told me the turbo can remain in place when doing head gaskets.

I've also talked to mechanics who recommend what John does - remove the cab or pull the engine... These recommendations likely come about because of the use of ARP head studs, which does make it harder due to clearance issues with the firewall. Soaking any rusty hardware overnight with a product like WD-40 is a common recommendation.

Reply With Quote
Old 05-13-2011, 08:46 PM
9365turbo 9365turbo is offline
Join Date: Jan 2007
Location: Spokane Wa.
Posts: 139

I didnt remove the turbo when I replaced my head gaskets on my 02 lb7
Reply With Quote
Old 05-13-2011, 08:49 PM
9365turbo 9365turbo is offline
Join Date: Jan 2007
Location: Spokane Wa.
Posts: 139

check this page out.
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -7. The time now is 11:13 AM.

Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Copyright 1996-2018 by - All Rights Reserved