idle speed setting?

[Monster Man]

hey all I want to adjust my idle speed to 800 RPM, anytime it's below that it seems to shake too much. I went to adjust it last night but couldn't figure out the rod- it appears there are no threads anywhere on the linkage to twist the rod in or out, and no stops. I tried a search through my manuals but sifting through 3000 pages on a computer screen is tedious <img src="emoticons/icon_smile_big.gif" alt="Big Smile">

I'm thinking them the only way to adjust it is to loosen the arm on the injector pump, twist it on its mounting shaft and reclamp it at the desired speed? Shouldn't cause problems right?

Oh, BTW, anybody who hasn't replaced their throttle return spring or doesn't carry a spare should- mine is CRUSTY and weak and looks like its about to break, and I've had that happen on another vehicle, it's NOT a pretty sight when you try to stop the vehicle. Better yet double them up for safety

 

[Recovry4x4]

There is an idle screw adjustment right on the pump. Look at the front of the density compensator. There is a little slotted shaft and a jamb nut. Loosen the jamb nut and adjust the slotted screw to adjust idle. After just a quarter turn, wick the throttle just a bit and monitor where it goes. Do this until you reach that 850 mark recommended for turbo trucks.

 

[Monster Man]

Originally posted by Recovry4x4

There is an idle screw adjustment right on the pump. Look at the front of the density compensator. There is a little slotted shaft and a jamb nut. Loosen the jamb nut and adjust the slotted screw to adjust idle. After just a quarter turn, wick the throttle just a bit and monitor where it goes. Do this until you reach that 850 mark recommended for turbo trucks.

hmmm... I don't have the truck today, but it's been converted to diesel only, does this explain my lack of idle adjustment stops jam nuts and whatnot? All I saw is the pedal rod connected to the arm on the pump, there's no stops that I could see <img src="emoticons/icon_smile_help.gif" alt="Help"> it seems the stop is internal, inside the pump and it stops the arm from moving

 

[Recovry4x4]

The stop is inside the pump and even if the density compensator is bypassed, the screw is still there! Check it out when you get back to the truck.

 

[Longhunter7]

MM!

Are you sure that you want to jack the idle speed up to 800 rpm?

When you are done driving the truck, you need to let it cool down at idle for 5 min., before you shut it off!

At 800 rpm, it will take longer, and if you forget, could do some damage!

What I do, is let the truck warm up for 5 min., THEN jack it up with the hand throttle to 800 rpm!

I was told by a Motor Pool sarge, that you will get better lubrication at 800 rpm, so that is how I warm up the Deuce before driving it!

Just my <img src="emoticons/icon_smile_.gif" alt="My 2 Cents">

 

[Monster Man]

Originally posted by Longhunter7

MM!

Are you sure that you want to jack the idle speed up to 800 rpm?

When you are done driving the truck, you need to let it cool down at idle for 5 min., before you shut it off!

At 800 rpm, it will take longer, and if you forget, could do some damage!

What I do, is let the truck warm up for 5 min., THEN jack it up with the hand throttle to 800 rpm!

I was told by a Motor Pool sarge, that you will get better lubrication at 800 rpm, so that is how I warm up the Deuce before driving it!

Just my <img src="emoticons/icon_smile_.gif" alt="My 2 Cents">

that's true, I always warm her up at about 850, but when I let off the hand throttle it drops to like 750 or 700 sometimes. Then it starts shaking and running rough. That cool manual says the vibrations set up below 800 can cause parts to fly off so I don't want to cause any extra stress <img src="emoticons/icon_smile_dead.gif" alt="Dead">

out of curiousity, can you see your temp guage go down at all after letting her warm down? Both warmup and warm down I can't see any movement of the needle, but after driving it'll go up to about 170 and only go up more if it's offroad. It's RREEAAALLL SSLLLOOOOWWWWWW if you know what I mean <img src="emoticons/icon_smile_big.gif" alt="Big Smile">

 

[Longhunter7]

MM!

It isn't the engine temp that you are concerned about after driving, it is the turbo temperature!

The turbo needs to run a idle speed to allow it to cool down!

On start-up, you want to let the turbo run at idle speed for 5 min. BEFORE you incease the speed, to allow proper lubrication!

From what I have been told, you need to protect the expensive $ turbo $ from too much heat and insufficiant lubrication! <img src="emoticons/icon_smile_.gif" alt="My 2 Cents">

 

[Monster Man]

Originally posted by Longhunter7

MM!

It isn't the engine temp that you are concerned about after driving, it is the turbo temperature!

The turbo needs to run a idle speed to allow it to cool down!

On start-up, you want to let the turbo run at idle speed for 5 min. BEFORE you incease the speed, to allow proper lubrication!

From what I have been told, you need to protect the expensive $ turbo $ from too much heat and insufficiant lubrication! <img src="emoticons/icon_smile_.gif" alt="My 2 Cents">

wait- now I'm confused. I thought on startup I should run it at 800 RPM for five to ten minutes before starting off <img src="emoticons/icon_smile_help.gif" alt="Help"> and then idle down for five minutes?

The manual said you didn't want to run at under 800 on startup because the vibrations. Have I been doing it wrong? I warm it up at 800 then it drops to around 700 and up to 750 when I take off the manual throttle

 

[Recovry4x4]

<font color="green">[3]<font face="Comic Sans MS">Mine has a data plate on the dash that states not to run it over 1000 rpm for the first 5 minutes and to let it run under 1000 rpm for 5 minutes before shutdown. </font id="Comic Sans MS">[/3]</font id="green">

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[Longhunter7]

SS members!

I didn't mean to confuse anyone!

My Deuce doesn't idle that rough at idle speed, so I let it idle for 5 min., and only 5 min., THEN I increase the idle speed UP to 800/850 until it is warmed up! <img src="emoticons/icon_smile_reyes.gif" alt="Reyes">

OK, OK, maybe I BABY my Deuce too much! <img src="emoticons/icon_smile_lol.gif" alt="LOL">

Your mileage may vary! <img src="emoticons/icon_smile_shrug.gif" alt="Shrug"> <img src="emoticons/icon_smile_vconf.gif" alt="Very Confused"> <img src="emoticons/icon_smile_question.gif" alt="Question">

 

[Recovry4x4]

<font color="green">[4]<font face="Comic Sans MS">I think the bigger concern is the 18 year old "Soldier-A" who jumps in the truck ticked off about cleaining the head and stomps on the throttle after startup and spins the bearings out of the turbo. On the same effect, stopping a hot turbo bakes the oil thats inside. This is called coking. Any reasonable warmup should be of benefit and proper cool down too. Since we own and pay for the trucks we treat them better than the 18 year old who drove them before us. Common sense will prevail here. I think 100 RPM in one direction or another for 1 minute or two won't be catastrophic!</font id="Comic Sans MS">[/4]</font id="green">

 

[Longhunter7]

Absoltively and posilutely! <img src="emoticons/icon_smile_reyes.gif" alt="Reyes"> <img src="emoticons/icon_smile_rotfl.gif" alt="ROTFL"> <img src="emoticons/icon_smile_thumzup.gif" alt="Thumb Up">

 

[Desert Rat]

Guys;
When in doubt let her idle....... As with any turbo diesel, if you are going to stop and get a sandwich and fries let her idle. It's inefficient to shut her down and less than 1/2 hour later fire her up again. You will burn more fuel and stress the turbo more too by doing that. It takes approximately 2/3 of a quart of fuel to fire these engines up anyway and at that rate you'll use that ammount of fuel in about 30 minutes of idle time. Truning up the idle is always a good idea too. Reductions in vibrations and improved circulation are two of many reasons to do this too. So happy MVing!

 

[Dieselsmoke]

Idle vibrations are a big killer on these expensive 24v headlamps. If it's vibrating that bad go ahead and kick the idle on up.

 

[Recovry4x4]

Originally posted by Dieselsmoke

Idle vibrations are a big killer on these expensive 24v headlamps. If it's vibrating that bad go ahead and kick the idle on up.

<font color="green">[3]<font face="Comic Sans MS">This is the gospel and I can attest to it. Not practicing my own advise on my recent trip yielded me with only one headlight and the spare at home on the workbench. Dang the luck!</font id="Comic Sans MS">[/3]</font id="green">

 

[Desert Rat]

Ken;
I'm seeing the word OOPS being vibrated in my mind repeating over and over and....... I wonder why...........<img src="emoticons/icon_smile_wink.gif" alt="Wink"> I hope the damage isn't bad to the tire.

 

[willysmd]

So what is the correct idling speed on these things then

 

[jasonjc]

PER TM9-2320-361-10 DEC 1988 for a LDT-465-1C and/or LDT-465-1D 800-850RPM's

650-700 for a non tubo

 

[Banshee365]

My LD-465 with a C turbo added and non-turbo timing and fuel settings surges up and down at idle settings below 800 after it warms up. I didn't know if something was wrong with my IP but i set the idle at 800-850 and the surge goes away. Is this too high?

-Kelly

 

[houdel]

Listen to your engine. The recommended idle speed idle speed for a turbo'd LDT465 is in the 800-850 rpm range as best as I can recall. I run mine at 800 rpm, it seems happiest at that speed. A little below 800 rpm it shakes too much, above that it doesn't run any smoother, only faster. Forget the tachometer reading, set the idle speed just above the point where the engine runs smooth and easy and let it be. For more specifics on adjusting the idle speed see http://www.steelsoldiers.com/index.php?name=PNphpBB2&file=viewtopic&t=5250