Smoking 3116 Cat - Diesel Truck Forum - TheDieselGarage.com
Thread Details Posted by David Scott Smith, this thread has received 1 replies and been viewed 558 times.

 
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 01-24-2018, 02:12 AM Thread Starter
Junior Member
 
Join Date: Jan 2018
Posts: 2
Points: 277
Thanks: 0
Thanked 0 Times in 0 Posts
Smoking 3116 Cat

Hello everyone,

Need a bit of advice on troubleshooting a fuel system problem on a 3116 Cat Engine in a 1996 Chevy 8500 (270 hp). I've been chasing a fuel system problem for a while and would like validation on my next hypothesis.

I apologize for the length of this post in advance!

Full story.

Chapter 1.

The engine was running a bit rough and was smoking badly so i took it to a local repair shop to have it looked at. They diagnosed two failed injectors (5&6). They replaced the injectors and attempted to set the valve lash. When setting the valves they said that the intake on Number 6 "kept coming up". They wanted to pull the head and do a valve job. Knowing this engine only had a 100000 miles on it I cried foul and had them put it together enough to get it home.

Chapter 2.
Being mechanically inclined and not a stranger to the world of diesels I ordered the repair manuals and verified their work. After pinning the engine correctly I determined that they were trying to set the valve lash 360 degrees out. I was able to correctly set the valves to spec. Because I wanted to ensure accuracy I also purchased the correct tooling and set the injector timing and synchronization.

Chapter 3.

The engine is running much better. But it is still puffing white smoke after its warmed up and I rev it up. No smoke at idle when it's warmed up. This smoke smells like unburnt fuel.). To continue troubleshooting this I pulled the fuel lines and inspected them. I also installed clear tubing on the fuel supply and return lines. I ran the lines into a bucket of clean fuel. I noticed two curious things. A). The return line has some small bubbles in it. B). The remaining fuel in the bucket darkened when it was run for a while.

My current hypothesis is improper seating of the injectors on the cups. My plan is to remove the valve cover and test each injector individually while running by pushing in on the fuel rod on each injector. Im going to look for the injector that causes extra bubbles. Am I going down the right path? Or should I be looking elsewhere? If I find the problem can I simply order the tools and reseat the injector?






Sent from my iPad using Tapatalk
David Scott Smith is offline  
Sponsored Links
Advertisement
 
post #2 of 2 (permalink) Old 03-08-2018, 03:36 AM
Junior Member
 
Join Date: Jun 2016
Posts: 40
Points: 6,782
Thanks: 1
Thanked 7 Times in 6 Posts
I have not been around in a while and you are probably done. However if not those engines are bad to crack injector sleeves. Bubbles in the return line from the head is normally an indication of that if there are no bubbles in the fuel supply to the head. A local company had so much trouble with their fleet they bought the tools. Pulled the heads and did them all at the same time. It is possible to do just one with the head installed if you have the tooling and knowledge.
tenwheeler is offline  
Reply

Quick Reply
Message:
Options

Register Now



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

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

Password:


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

Email Address:
OR

Log-in










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



Similar Threads
Thread Thread Starter Forum Replies Last Post
Cat 3116 Help Sierra SS Medium and Heavy Duty 12 03-12-2017 07:17 PM
is a 3116 cat enough hp fslade1990 Medium and Heavy Duty 4 11-12-2012 06:56 AM
Cat 3116 / 3208 Needs More Hp? C & M MD and HD - Modification Instructions, Product Installs and Tech Articles 13 06-10-2010 01:54 PM
cat 3116 sidssm Medium and Heavy Duty 11 11-11-2007 03:33 AM
3116 Cat in Topkick allrevedup Medium and Heavy Duty 3 11-19-2006 08:19 PM

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