How to adjust the throttle on a '64 PD4106?

[bwze]

OK, I just got finished installing my accelerator cable back in my conduit (see this post for more on that fiasco) and have removed, cleaned, painted and readjusted all the clevises and stops up front per DA BOOK. But when applying pressure on the pedal down to the bolt stop (height at 5 3/8"), I still am not close to full throttle.....so.....

How do I know if the lever on my throttle (lower right) is in the proper position? It seems to me that this lever could be moved via the clamp to most any position until the bellcrank made contact with the fast idle control cylinder (lower cylinder in photo).....as long as the throttle cable wasn't connected.....

[Just Dallas]

There's a bunch wrong with that picture, but I can't put my finger on it.
Nothing seems to be in the right place for the engine.

Look at the pictures in your manual and go from there.

[TedsBUSted]

Bwze - I would adjust so that with the pedal "nailed" and with the cable and all linkage under load, so that there's no play, the engine's lever is at full fuel and the spring is just beginning to take the load. In other words, if any further pedal travel were possible it would load the spring, and slightly backing off  the pedal will still have the engine at full fuel without the added override spring tension. If that adjustment can't be attained there's probably wear or stretching or conduit compressing that has to be dealt with.

In addition to the pinch bolt, fuel lever is keyed to the shaft at a fixed location so moving that is not an issue.

Ted

[bwze]

That's what I thought too Dallas.

Ted, I've already pulled the cable and inspected the conduit as explained in the link from the post above. I reinstalled and adjusted everything as the manual says to do, but with the pedal to the bolt.....I don't have full fuel....no even close. That's why I'm asking about moving things at the throttle lever.

[bwze]

While taking another look at my manual, it appears that my governor is not the same as the one pictured.

My throttle and stop levers are reversed from what is shown. Anybody got a clue why....(new design not included in this revision of the manual maybe???)

[luvrbus]

If you are not getting full throttle the first place to start is the shutdown make sure you have clearance between the lever and the shut down cylinder when in run mode and be sure it does not creep when air pressure builds up


good luck

[bwze]

The shut down cylinder doesn't keep the throttle from moving.....as far as I can tell. As stated earlier, I know the cable is adjusted properly (as as the manual states). I got my wife to push the pedal down to the stop bolt while I looked at the throttle response in the rear. There was still at least a quarter turn left on the throttle lever.

Wait a minute, I just had a thought. I did the above throttle position test with the engine off. Does the thottle lever move any by itself while the engine is running?

[Just Dallas]

Do you have an accurate tachometer to read engine speed at the engine with?

That will tell you if you are reaching governed RPM. You may be where you want to be without knowing it. Just because the lever will move farther doesn't mean it will give you more fuel.

Do yourself a favor and buy one of these:
http://cgi.ebay.com/Digital-LED-Laser-Tachometer-Engine-Handheld-RPM-Gauge-/150523424443?pt=LH_DefaultDomain_0&hash=item230be52ebb

They come in very handy for more than just Detroit Diesels.

[bwze]

Gotcha....that never crossed my mind. I just assumed it was needed to move more. You know what they say about assuming....

[Just Dallas]

I did some digging around in my files and I came up with this picture.
Sorry about the quality, it wasn't the best scan ever done.

[bwze]

Yep, same one in my manual. Just like I said earler, the stop and throttle levers are reversed from my image up top.

[bwze]

As a follow up and to bring closure to this thread, I did take the 4106 out this weekend and all I can say is WOW.

Just Dallas hit the nail on the head with....

Just because the lever will move farther doesn't mean it will give you more fuel.

I'm really seeing a lot more response now that the cable is lubed and all the adjustments are correct. On a straightaway near my house that I normally only got up to 55 on, I was easily kissing 70 and didn't even know it.....thanks for the responses and help guys......