4mg 3406 needs inframe. What engine serial number should I use to order a kit? - Diesel Truck Forum - TheDieselGarage.com
Thread Details Posted by Scrap hauler, this thread has received 5 replies and been viewed 1367 times.

 1Likes
  • 1 Post By Scrap hauler
 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 04-24-2017, 02:59 AM Thread Starter
Junior Member
 
Join Date: Mar 2014
Posts: 20
Points: 23,943
Thanks: 10
Thanked 1 Time in 1 Post
Garage
4mg 3406 needs inframe. What engine serial number should I use to order a kit?

I have a 4mg77190 in a 379 Pete. The previous owner swapped it in there it's not the original engine which was supposed to be a 400hp. It was very underpowerd to pull 80k loads so I put a pump off of a 425 on it a few years back and also a turbo off a 400. It went from turning 1700 rpm no load to 2100 rpm no load. Also went from 17 lbs of boosts to 26. The truck ran great, no overheating and has never used any oil and only black smoked when going thru the gears until the boost got up enough to burn the fuel. Fuel mileage has allways been poor when loaded and even after changing the pump and turbo it still never performed loaded as well as the 425s I have driven. It burned a piston last week so I'm going to inframe it. What kit should I order to get the best pistons and also thinking of changing the injectors because I'm sure what's in there are pretty small it being a 310hp. Also should the timing be altered as well. Not looking for a hot rod but would like to go back with the right parts to get at least 425 hp out of her and 5mpg. Can anyone tell me the right pistons to use as well as what I need to do as far as injectors and timing? Thanks in advance. It's hard to find anyone around my area that knows b model cats.
Scrap hauler is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 04-24-2017, 04:31 PM Thread Starter
Junior Member
Threadstarter
 
Join Date: Mar 2014
Posts: 20
Points: 23,943
Thanks: 10
Thanked 1 Time in 1 Post
Garage
I have done some reasearch and was thinking of going with 3421 injectors and 9y4004 pistons. Will they work with my current cam and pump and advance? What will the timing need to be set at?
Scrap hauler is offline  
post #3 of 6 (permalink) Old 04-25-2017, 03:45 PM Thread Starter
Junior Member
Threadstarter
 
Join Date: Mar 2014
Posts: 20
Points: 23,943
Thanks: 10
Thanked 1 Time in 1 Post
Garage
Smoking cat can you offer any advice?
Scrap hauler is offline  
post #4 of 6 (permalink) Old 04-29-2017, 01:18 AM
Junior Member
 
Cat Attack's Avatar
 
Join Date: Nov 2014
Posts: 168
Points: 42,123
Thanks: 74
Thanked 49 Times in 41 Posts
Garage
3421's should be used with 14.5:1 compression pistons and a minimum of a 18 cam but preferable a 21 7FB 425 pump cam or the best option being the 24 7FB 400 cam. Someone got your timing too far advanced when your pump was changed if infact you have holes burnt in pistons

Larry
Cat Attack is offline  
The Following User Says Thank You to Cat Attack For this addition to TDG:
Scrap hauler (05-01-2017)
post #5 of 6 (permalink) Old 05-01-2017, 09:32 PM Thread Starter
Junior Member
Threadstarter
 
Join Date: Mar 2014
Posts: 20
Points: 23,943
Thanks: 10
Thanked 1 Time in 1 Post
Garage
SO I NEED TO CHANGE THE CAM IN THE INJECTOR PUMP? OR THE ENGINE CAMSHAFT? OR BOTH? DO YOU HAVE PART NUMBERS? CAN I USE THE SAME ADVANCE?
Cat Attack likes this.
Scrap hauler is offline  
post #6 of 6 (permalink) Old 05-03-2017, 09:58 AM
Junior Member
 
Cat Attack's Avatar
 
Join Date: Nov 2014
Posts: 168
Points: 42,123
Thanks: 74
Thanked 49 Times in 41 Posts
Garage
Just the pump cam is different and id have to look it up to get ya the # and yes your advance is the same but just so ya know a pump cam is ,ike $2000-2200 and special tools are needed and at the very minimum a complete reseal kit for the pump and governor and lap the barrel and plungers to the bonnets. The whole pump us a very complicated, tedious project if your not familliar with them and dont have a service manual for the pump. It would be cheaper and easier for you to go to a salvage yard and get a pump from a 7FB 400 WJAC with a 24 cam or One from a 7FB 425 ATAAC With a 20 or 21. The 24 is the best one but both are for 14.5:1 compression and 3421's and will deliver more fuel than if u used your 18 cam with the 3421's.

Larry
Cat Attack is offline  
The Following 2 Users Say Thank You to Cat Attack For this addition to TDG:
Oxbow12 (05-07-2017), Scrap hauler (05-03-2017)
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
engine serial number to year cross reference chart? gtspowerstroke 1994-2003 7.3L Power Stroke 0 05-14-2013 07:41 PM
Engine serial number location itali83 5.9L Cummins 12 Valve (1994-1998.5) 0 06-11-2012 02:23 AM
Can VIN be deduced from Engine Serial Number? roundsound Ford Oasis requests 2 01-24-2011 01:10 AM
Cat 3406 inframe. jegs Medium and Heavy Duty 3 02-13-2008 01:53 PM
Engine serial number? Hitechredneck 1994-2003 7.3L Power Stroke 4 06-09-2007 12:30 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