How many miles before rebuild? - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 01-04-2020, 06:53 AM Thread Starter
TravisJW123's Avatar
Join Date: Jan 2020
Posts: 2
How many miles before rebuild?

I am brand new here, so I’m not good at the using the forum yet. I have been reading from this site for about 7 years and you guys have helped me plenty. I’m on my second LB7, that’s all I’ve driven since 05. I currently have 276000 on mine and it’s about time for the 2nd set of injectors. My question is, should I think about rebuild at that mileage before spending 3 grand on injectors?
TravisJW123 is offline  
Sponsored Links
post #2 of 7 (permalink) Old 01-04-2020, 08:49 AM
Senior Member
Join Date: Jan 2011
Posts: 463
if its running good,not to much blow by,,I'd keep running it,,my old truck is approaching 400k and is still an animal.needs another set of injectors but thats it.

2002 GMC 2500HD, ECSB, 4WD, LB7
new style gm exhaust manifold, banks big head wastegate, PPE boost valve, banks air intake,high idle switch in cruise control, stock but not for long
EFI live tuned by me now,dps5 switch,EGT probe and autometer boost sensor,SoCal 6spd conversion

2016 GMC Denali stock for now
gmc502 is offline  
post #3 of 7 (permalink) Old 01-04-2020, 03:24 PM Thread Starter
TravisJW123's Avatar
Join Date: Jan 2020
Posts: 2
Thanks, it does have a little blowby. enough to get the tube and front corner of the oil pan wet between oil changes. But it never drips on the ground. How much does yours have at 400?
TravisJW123 is offline  
Sponsored Links
post #4 of 7 (permalink) Old 01-04-2020, 03:47 PM
DuramaxForum Enthusiast
Thebiggids's Avatar
Join Date: Jun 2011
Location: Bellingham, Wa
Posts: 4,418
You could check the compression and go from there but I wouldn’t just jump into rebuilding it just cause it has 276k on it.

01 LB7
2007 Yukon Denali
Work Rig 2016 GMC Sierra 5.3
Thebiggids is offline  
post #5 of 7 (permalink) Old 01-04-2020, 08:25 PM
DuramaxForum Enthusiast
Earnhardtfan's Avatar
Join Date: Mar 2011
Location: Concord, NC
Posts: 2,040
That tube is the crankcase breather so if the pan is wet it's doing its job. Other than head gaskets/studs my engine still running on what the factory built.....except for a few sets of injectors of course!

Justin 2001 LB7 Silverado 2500HD LT CCSB 4x4.
EFI Live by Idaho Rob, 536K+ and rolling, Undercover Bed Cover, Vortex spray in bed liner, Odyssey Extreme Batteries, Westin steps, Bilstein Shocks, Road Master Active Suspension, M/A Pump Rub Kit, PPE Trans Cooler, MBRP 5" Exhaust, Edge Insight CTS, K&N drop in filter, AirDog II 100 w/ CAT 751, LLY FF Housing w/ Racor, Running on LMM Blacked out Wheels & Michelin LTX M/S2 tires.
Lincoln Diesel Specialties
Merchant Automotive
Earnhardtfan is offline  
post #6 of 7 (permalink) Old 01-04-2020, 08:30 PM
LHN...We ARE the Joneses
Hook'em_Horns!'s Avatar
Join Date: May 2008
Location: Awww-stin, TX
Posts: 25,948
Send a message via Yahoo to Hook'em_Horns! Send a message via Skype™ to Hook'em_Horns!
it’s about time for the 2nd set of injectors.
Look into the newly available SAC00 injectors instead.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
Hook'em_Horns! is online now  
post #7 of 7 (permalink) Old 01-05-2020, 10:44 AM
DuramaxForum Veteran
long-time-dmax's Avatar
Join Date: May 2016
Posts: 1,052
408k on my LB7 and it runs just fine. No reason to think it'll need a rebuild short of 1,000,000 miles.

2002 Chevy 2500HD Crew - Original owner - 408,000 miles so far. All stock with the exception of a lift pump.
long-time-dmax is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Chevy and GMC Duramax Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome