Jump to content

Tri-axle dump ENDT 675 Needs a boost


 Share

Recommended Posts

Hello everyone, hope all is well. I've been working the 79 RD685S pretty hard lately and she's a real joy to drive until we find a good hill to climb. I know this is no race truck but I want to upgrade something, anything to help with the hill climbs. My turbo has a little oil blow by, would this make it weak? I really feel like something's off and need to figure it out, got a lot of dirt to haul this summer. Thanks!

post-5458-0-22854200-1432647623_thumb.jp

  • Like 2
Link to comment
Share on other sites

Turbo may be getting tired. Check the shaft for movement. Other than rotational movement, movement is bad. Any blade damage? Put a boost gauge on it to see what it is pumping up to. Might have a leak in the system and loosing boost.

The 675 is bulldog grunt not greyhound fast.

Thanks Jim, thats just it, I loosing grunt on them hills...lol....I'm about to put a gauge on it to check boost pressure. I have the S3B087 turbo, I've been told boost with a load on a good hill should be around 18-22 psi. Sound correct? I've got a plug in my manifold circled in the pic below, would this be a good place to istall the gauge?

post-5458-0-03322700-1432685188_thumb.jp

Link to comment
Share on other sites

  • 2 weeks later...

Picked up my newly rebuilt pump and a new turbo today. The turbo was completely shot beyond a rebuild and pump was in very bad shape. Turned the pump up a little. Shouldn't feel like the same truck. I'm very suprised at how well it run with those problems. Should have it back together by Sat or Monday.

  • Like 2
Link to comment
Share on other sites

  • 2 weeks later...

Happy Fathers day to all the dads!

I've been working on my throtle linkage problems and I've got a question.

When I adjust my linkage out enough to get full throttle I have trouble with a high idle because the linkage is hitting the firewall and not falling back enought for idle position. Is it supposed to do this or can i trim the linkage to where it will miss the fire wall?

post-5458-0-53276700-1434936360_thumb.jp

Link to comment
Share on other sites

Happy Fathers day to all the dads!

I've been working on my throtle linkage problems and I've got a question.

When I adjust my linkage out enough to get full throttle I have trouble with a high idle because the linkage is hitting the firewall and not falling back enought for idle position. Is it supposed to do this or can i trim the linkage to where it will miss the fire wall?

Allow me to answer my own question in hopes it helps some poor sap in the future.

You can cut this linkage, but you will shorten the push length and it will have to be gained back at the throttle linkage wich put me back at square one. I'm not liking the way my throttle linkage is set up! If anyone has got a pic of the way there's is set up I'd appreciate it. I'll probably re-fab this one and try to make it better, need some ideas though. Thanks

Link to comment
Share on other sites

Sorry I didn't see this earlier. It would have saved you some grief.

The dirty, oily linkage is on my 237. keeping everything well oiled is what has kept it good for 30 years of being in salt.

The cleaner linkage is off a 350 4V . It appears to be the same, and a lot easier to get close pics.

I think this will shed some light on your troubles. If you want any other pics, or from a different direction, let me know

Don't let the spring in the 350 pics confuse you. Its not factory. I find I have a lot nicer pedal with 2 long springs (one there,one on the pump), instead of the 2 factory springs .

post-17364-0-52475400-1435067769_thumb.j

post-17364-0-11883100-1435067791_thumb.j

post-17364-0-99513700-1435067809_thumb.j

post-17364-0-12353900-1435067831_thumb.j

  • Like 1

Keith 

Link to comment
Share on other sites

Sorry I didn't see this earlier. It would have saved you some grief.

The dirty, oily linkage is on my 237. keeping everything well oiled is what has kept it good for 30 years of being in salt.

The cleaner linkage is off a 350 4V . It appears to be the same, and a lot easier to get close pics.

I think this will shed some light on your troubles. If you want any other pics, or from a different direction, let me know

Don't let the spring in the 350 pics confuse you. Its not factory. I find I have a lot nicer pedal with 2 long springs (one there,one on the pump), instead of the 2 factory springs .

attachicon.gifImage 6.jpg

attachicon.gifImage 7.jpg

attachicon.gifImage 8.jpg

attachicon.gifImage 9.jpg

Thanks for the photos! That helps shine a light on things. It's hard to figure something out when it wasn't right to begin with.

Link to comment
Share on other sites

Its only 237HP and 906Lb.Ft. torque. What type of weight are you trying to haul and what percent of grades are you trying to climb. The little 237 might be doing all she can.

Rick, since I've gotten the new turbo and pump, I'm satisfied with her performance. I know what I got, I just needed it be performing at her best! The 237 was later installed before I bought it. They did a good job but the throttle linkage wasn't up to par, I've about got it figured out though.

Link to comment
Share on other sites

I wish I could help ya, but my accelerator pedal is on the right side (yours being left/wrong side). Are there any bushes or linkages that are worn?

They have some wear but I beleive my biggest problem is it wasn't installed correctly. Think I'm getting some where with it now, thanks!

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...