Jump to content

I Need The Cure (For My Detroit)


JumperAndSon
 Share

Recommended Posts

Today I went out and did some investigating on my almighty 8V71, only to find that I am facing every Detroit Diesel owner's worst nightmare: A STUCK RACK (Gasp!!!) So I'm wondering what the magical technique I can use to cure this dilema so as to not get a connecting rod in my stomach when I go to fire it up. Is there way to break the injectors loose without using any extra special tools? If not, where can I get an injector tool? I want to move towards getting this motor running and that is a major setback. So if anybody knows the cure, could you please enlighten me? Thanks a lot :D

Ben

post-10909-0-78145100-1332278883_thumb.j
Link to comment
Share on other sites

get some valve cover gaskets and pop the covers athen you will be able to work the rack by handshould be able to see the issue, I have had some luck just tapping the injector with a small brass hammer after coating the rack with penetrating oil, we have a ton of Detroits here at CSX everything from 3-53's to 8-92's and I have seen a stuck rack about 10 times so far after a machine has sat in the weeds unused for a while most can be tapped and poked and prodded back to life.

"Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin

"If your gonna be STUPID, you gotta be TOUGH"

"You cant always get what you want, but if you try sometimes you get what you need"

Link to comment
Share on other sites

get some valve cover gaskets and pop the covers athen you will be able to work the rack by handshould be able to see the issue, I have had some luck just tapping the injector with a small brass hammer after coating the rack with penetrating oil, we have a ton of Detroits here at CSX everything from 3-53's to 8-92's and I have seen a stuck rack about 10 times so far after a machine has sat in the weeds unused for a while most can be tapped and poked and prodded back to life.

Well I figured out that it's the right side rack that's stuck. I tried taking a small piece of wood and tapped it with a hammer but the rack didn't move. I didn't wanna hit it too hard for fear of bending/breaking something. What doesn't make sense to me is that it seems like all 4 of the injectors on that side are loose but the rack still isn't moving. Why would that be? About 3 months ago I checked and everthing was free so it just locked up recently.

Ben

post-10909-0-78145100-1332278883_thumb.j
Link to comment
Share on other sites

So what you're saying is............if the rack is still stuck after the 4 lbs. of C4, then try a 20lb. sledge? How should I shape the charge to dislodge the rack? Like a triangle to concentrate the force? Like a little bunny rabbit friend of the gopher?

Tim

Take the 4 lb block of C-4 and place it on the side of the engine block, stand back about 1000 yards and detonate and that should un-stick the rack and cure the oil leaks as well.

TWO STROKES ARE FOR GARDEN TOOLS

Link to comment
Share on other sites

A detroit can also be used for its OTHER intended purpose,moved from the rear,to the front of the ship.........................................Mark

Mark, this is true however if used for that purpose it should only be after emptying the crankcase of oil and giving the whole oily thing a good through steam cleaning, wouldnt want to pollute 12 miles of shoreline.

TWO STROKES ARE FOR GARDEN TOOLS

Link to comment
Share on other sites

Mark, this is true however if used for that purpose it should only be after emptying the crankcase of oil and giving the whole oily thing a good through steam cleaning, wouldnt want to pollute 12 miles of shoreline.

You are correct,perhaps i should have issued an EPA warning/disclaimer! think of the poor fish,seals and everything else poisoned by oil!..............................Mark

Mack Truck literate. Computer illiterate.

Link to comment
Share on other sites

So I should blow it up with C4 then pound all the pieces back together with a 20lb sledgehammer so I can use it for a boat anchor?

Ben

You could just go staight to "boat anchor" and save time. As for the oil, it likely already leaked out. Another option is a lawn ornament. poke.gif

On a serious note, if the injector racks are free, then the linkage is stuck. Try spraying Blaster on all the moving parts and let them soak for a few days.

Ken

HOF City, PRR Country, and Charter member of the "Mack Pack"

Link to comment
Share on other sites

Ben... hold off on the C4..!!!!

do you have the later Injector Control Tubes with the individual spring-loaded rack levers???

the older rigid tube/lever jammed all injectors if one stuck, newer type elimanted this issue, though you still have to deal with the injector that is stuck..

generally, if the newer individual spring tubes are installed the air intake flap can be deleted...

if you have the DD V71 bible.. it is chapter 2.9 of the service manual

BC Mack

Link to comment
Share on other sites

BTW FWD, I think you're just jealous. We have extra Detroits if you want to come over to the dark side :twothumbsup:

I dont think thats going to happen. I know I told Ben this joke once, but in case if you missed it- "Whats the difference between a green banana and a Detroit? They aint worth a shit until they turn (cat) yellow!!!!!

  • Like 1

TWO STROKES ARE FOR GARDEN TOOLS

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...