LB7 Tool No Mechanic Can Live Without

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Randy1156

New member
May 5, 2013
9
0
0
There remans off ebay $1264.95 kit with gaskets one year warranty. truck run great pulls great cranks great has a little lite smoke now at idle. my nephew said he thought one was bad. now about 300 miles not pulling an empty two car trailer a 100 of those mile put the oil level up to the well big knot on the oil stick. haven't measured the actual amount.
injectors come from Diesel Logic off ebay
 
bullfrogjohnson

bullfrogjohnson

Big Girl!
Nov 20, 2006
4,167
1
0
39
Locust, NC
You can put UV dye in the fuel system and run the engine with the upper valve covers off. Make sure the return lines don't have cracks. Most internal leaks I have dealt with are on the return side. I have actually only worked on one truck with a cracked injector body. A leak on the high pressure side will fill the engine very quickly. While the upper covers are off, unplug the fuel pressure regulator while its running and if you have a cracked injector body you will find it. Just be careful, 20000psi fuel leak can hurt you.
 
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Randy1156

New member
May 5, 2013
9
0
0
Thanks Again For Some Great advice Guy's I've already ran the lb7 with the upper covers
off I'm going to try the vacuum tool next I'm sure you guys Know how much fun it is working on one of the monsters in the truck. if the vacuum checks out the hi pressure will be next !!! thanks for the 20000psi warning too :thumb:
 
hotdogstand

hotdogstand

Member
May 27, 2013
35
0
6
Norfolk, VA
When I saw the title, I was sure I was about to read a thread about a BFH. This is way better. A tool that actually prevents the frustration, instead of only venting it.
 
Robby Avery

Robby Avery

GM TECH @ FENDER GMC
Jul 31, 2008
820
2
18
Norman Park, Georgia
Very nice I will make one up to keep in my toolbox at the dealership were mainly dealing with new stuff don't see to many of the older trucks come in but when they do I can't want to get my hands on them
 
zf>allison

zf>allison

you never had your car.
Apr 30, 2013
3,394
0
36
elsberry mo
Couldn't u check for leaks with pressure instead of vacuum? Just like a regulator set at 15 psi on an air gun with a guage?

Or is that what he's doing?
 
HVACMike

HVACMike

New member
Jan 10, 2015
12
0
0
Casper, WY
Sweet setup. I will be doing this in a few days. It will be nice to have the piece of mind when I reassemble everything
 
Lmmbrad33

Lmmbrad33

IBEW 15
May 8, 2016
20
0
0
Oregon, IL
Can this be used to diagnose a leaky line before actually doing injectors? AKA can I use this set up without engine being torn down? Very very new to Lb7 world...
 
Lmmbrad33

Lmmbrad33

IBEW 15
May 8, 2016
20
0
0
Oregon, IL
Yes, number 5 slight rattle at idle when warm. Rates 5 in park, 7 in drive. Slight amount of fuel in oil (don't know when last oil change was as I just bought truck a bit ago) No smoke on start up, runs awesome. Have tried GM Upper engine cleaner trick to no avail.
 
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