How to Turn up a 3406b cat

[@Gcal1956]

This is one of the many reasons to own a 3046 b, or e model. Or a Detriot 60 series or a n14 Cummins. You can work on them with minimal effort and tools. Vs a new dd15 or Volvo motor or a isx or x15 Cummins. You need a lap top and you better be sure of what your doing on the new motors or your going to limp mode. These old school motors can be driven even when something is wrong. They will still get u home. Vs the new motors will get u a tow truck bill and a hefty dealer bill to make sure there is salt on the wound. Old school diesels for the win!

[@kentucky8256]

Gcal1956 3406b for sure,so you don't need a laptop for 60 series Detroit or e model cat or N14 Cummins??? Hought they where electronic engines

[@deborahchesser7375]

Gcal1956 you know how it goes, the dealership wants a cut so they make special tools etc

[@deborahchesser7375]

Gcal1956 no shit! They just slow to idle and ur screwed no limping to the shop

[@captainredneck0683]

60 Series, 3406e, and N14's are electronic engines. They are very simplistic though compared to today's engines.

[@Stephen-carr]

@@captainredneck0683 unless have a n14 mechanical lol

[@scottfabian3320]

I worked on these engines at a cat dealership for years, there is more to adjust than just the full load and full torque screws, if you really want more power.Turning these screws will increase it a bit but you need to understand that this will change the engine set point and will alter the full throttle. Most time these are opened up because of low power and it’s always been in my experience because there was something else causing the power loss,timing advance , nozzles, fuel pump etc. Opening up the rack was usually a bandaid solution.

[@Punk-Jw]

I think that came later on when the new e and c15 came in. A lot of those trucks were worn out and they thought just because theyre old that theyre just not as powerful as the newer ones so they had them turned up. But back in the 80s and early 90s things were very different than they are today. Fuel cost was nothing in compareson to today. It wasnt such a big deal for some places, mpg I mean. My dad drove for a small company back in the 80s and 90s that had dressed up owner op spec trucks. They did general freight, dry van, reefer, flat bed and he had 3 tanks and you did different stuff all the time. All the trucks were turned up and tuned. 2 of the most known and remembered was a pair of LTL9000 fords with 45 or 50 inch flat tops. One had a 3406 400 with a 13speed and the other was a 3406 425 with a 15speed to haul fuel. We live in new england, lots of hills an mountains. Having the meanest truck was just the thing.

[@veteransdieselgarage7607]

Seen a lot of work done on these things trying to get more power due to low power and come to find out a few o-rings in the timing advance need to be replaced, people like these engines because they are simple compared to newer engines but you still need to know what your doing folks

[@TidalSnow1]

This man speaks no lies.

[@skigdividerx4991]

@@Punk-Jw Wrong,

[@skigdividerx4991]

@@veteransdieselgarage7607 Exactly!!!

[@johnhutsenpillerjr1785]

Don't let some comments lead you astray. The screws need to be adjusted equal like you did. The static timing is adjustable. It takes some skills and the right tools (a timing pin etc) if the engine's in good shape, valves and bridges adjusted, variable timing on front of engine (behind the cone shaped cover) the fuel and torque screws and the aneriod/puff limiter working and set right (use a lighter tension spring if possible) some pumps had a balance spring for fine tuning ? YOU DID GOOD JUST DON'T OVER DO IT (I'D OF TRIED 1/2 TO 1 TURN) IT'LL RUN SWEET !! WATCH THAT PYROMETER/BOOST GAUGE !! AND NEVER / NEVER LUG A CRANKED UP ENGINE. GOOD VIDEO ! TAKE CARE.

[@ianpocock271]

What way do you turn the screws clockwise or counter clockwise

[@DieselDoc78]

@@ianpocock271 He literally says CCW at the 2:32 mark

[@jyntrecoller7743]

The Allen wrench size is 3/32

[@merleelsing2400]

I here Bob Seger. in the background, you’ve got good taste in music my friend!

[@johnwolf7523]

I used to set the racks on the engines on the attachment line at the factory. Like the person said just resetting the rack will only give your engine a boost but it may change your torque curve unless you know how to change the torque spring etc.

[@bdub78dub90]

Owners of companies are saying shit, now these guys are gonna turn all my trucks up.

[@Vance_Nickerson]

Went 6 turns on both and ran it a while before taking the screws out. Use common sense and it will last forever. It will absolutely melt down if you don't pay attention. I had a blast with my 400b playing with other Big motors. I had a 6x4 behind it and would spank a 550 and embarrassed many 600hp trucks on SHORT intervals. When I sold it the new owner didn't want it cut back and drove it like an electronic engine and melted the turbo the second week. My rpms were set to 2600 and I kept it above 1800 at all times. You can't lug it. Let it breathe!

[@sprdaxlw9l]

Look on Diesel Garage Forum for screw setting info. IMHO it is not so good to remove both screws. You really need the torque screw in there. That is what makes a Cat different is the torque rise feature. It senses load and adds fuel without ever mashing the throttle- sorta like the governor on a farm tractor. Without it, governor just mainly controls max. rpm. To me that is what makes a Cat nice to drive. I bought mine in 1996 and I am still running it. 7W7031 marine injectors. Or6051 turbo. (I need to update that-lag and smoke) 15.2 comp alum pistons. 11 degree motor bumped to 15. E model manifold and FASS lift pump. Mine still has both screws in it and actually only set about 10-15% over spec. It does not suffer from any lack of power. Easily will wax a stock or mild 550 E.

[@redpilled3569]

Yes it was the same with the 315 big cam cummins I had the pleasure of driving. 1600 or above (2100 max rpm) when on the highway. That was a good motor fully loaded it was a snail but I never had any major motor issues. I then drove a cummins m11 and that one liked it high too. The owners manual said otherwise but when I tried it once it pulled like shit.

[@richieb6970]

@@sprdaxlw9l how much boost you getting out of that turbo

[@cruzbodden8673]

@@sprdaxlw9l hey how much hp you think you at with this set up ? I have a 3406b and i want to put R-3587 nozzels and go up on both screws a little

[@JohnDoe-pv8rc]

Had a 3406 b ataac 425hp in a t650 Kenworth gave the 500hp Macks a run for there money. Wish I still have the ol girl. It luved roadtrain work.

[@WickedIntentSemi]

Excellent video thanks!! Now I’m happy with my 425 stock runs cool on the pyro but all I want to see is more smoke …can I just do the afc without messing with the pump?

[@ronaldpiper4812]

E P A aproved. And cat certified.. Lol

[@6nzpurrs]

Just what I was looking for my 90 379 3406B thanks

[@Commetsgarage]

Lone Trucker no problem just don’t go to much to you can burn up the engine if you don’t watch your egts

[@ShowseeTravels]

Does this work on all Cats? 1990 3176b. Mine just came out of the shop with less power than it had. 🙃

[@nealk6387]

The screws are fuel and torque rise.

[@stayhooked9499]

Let's say the previous owner adjusted these screws , then I adjusted them another turn -how would I know if I went to far with the adjustment .….thanks in advance

[@sean7554]

Same thing here. My screws were off actually. One was turned til it couldn't turn anymore. And the other was about 2 turns back. I just turned the other screw all the way out aswell. Then turned both of them back. Idk why my screws stopped. Maybe its supposed to do that? Maybe you might want to go the other way with them. Then turn out.

[@raymondwilliams1473]

Should you have your advanced timing tuned as well when you don that?

[@JMfarmandcattle]

My fuel injection pump looks different on my 3406b from what I can see it doesn't have that. Any idea if it can be elsewhere? 7w3906 pump

[@sergiomedina1793]

Love the video

[@DJT652]

Do I have to adjust the AFC housing spring to complete the "tune up" or is that solely for extra "smoke"???

[@Commetsgarage]

David Garcia pretty much for smoke but also give you a more responsive pedal

[@adamtheede2575]

when you power up does your smoke clear?

[@ratrod3598]

I just replace my hole AFC but now it’s but to stock. You can’t find videos of actual instruction about this any where.

[@jacobgragg3626]

Do u have to do last step u talked about more smoke ?

[@ratrod3598]

Dude awesome.

[@Matt216321]

Thanks for the video, can anybody tell me how to adjust the throttle switch? My Jake's fire even if you step on the fuel pedal or slightly on the clutch. Truck is a 1990 379 with a 3406B CAT, thanks in advance, any advice will be appreciated

[@ludditeneaderthal]

Shouldn't you also set the turbo wastegate tighter? More fuel needs more air unless you want to melt pistons and burn exhaust valves, lol

[@clancytaylor7714]

Most of these old cats had a non gated turbo

[@kensauls1783]

@@clancytaylor7714 I put the 177148 wastegated on my b and I love love love👍👍👍it!

[@kensauls1783]

With 177148 turbo, 2 turns out with each fuel screw, do not change timing, pulls good with no more than 750 degrees and will handle more turns if you want

[@THEDC81025]

How much would you charge to do this to my Bmodel ? And where are you located I can drive to you

[@killerdrone]

If I only do the two nuts will it smoke alot?

[@Commetsgarage]

V G the two nuts control the power basically the smoke screw is the one on the top of the pump with a line going to it from the intake manifold

[@skrapenpennies9947]

My 3406 just shuts off for no reason. Idles good sometimes but pulling up to stop sign just shuts right off mostly after driving it for about 20 mins. Any ideas

[@pedromartinez5245]

My name is PETE I had same kind of problem with my B model caterpillar engine I found a loose electrical wire to fuel the fuel pump I did reconnect it properly and that took care of the problem. Good luck Sr.

[@skrapenpennies9947]

@@pedromartinez5245 OK thanks for reply. I'll check that out. Gonna check see if Jake brake may be sticking as well

[@michaelshylaluckey2838]

A 3406 B is a mechanical fuel pump, there are no wires to reconnect.

[@skrapenpennies9947]

Found the problem. Replaced all plungers runs like new

[@ratrod3598]

Should make a video about Fuel air ratio.

[@beckywatt5048]

Marlo Mayo He' sounds awful young and inexperienced to know let alone care anything about that.

[@redpilled3569]

Marlo Mayo this is not gasoline, this is diesel man! AF ratio, basically in a nutshell, is set by you pressing on the throttle.

[@BigBrex0124]

More air the better easy no mixture

[@dalewilliamson8790]

@@redpilled3569 the air/fuel ratio is that yellow thing on the back of the governor housing. Just above the shutoff solenoid.

[@Intell3ctualProperty]

Is he working on the fuel pump?

[@GunsDubstep]

Injection pump

[@michaellangdonful]

Can you turn up the horsepower on a Big Cam 400 Cummins too?

[@ThatFenix]

Yes, a big cam is with a spring and button. Injectors help a lot too.

[@michaellangdonful]

@@ThatFenix oh okay.

[@ThatFenix]

@@michaellangdonful it's not difficult. The 76 Kenworth in my videos ran pretty good with my dads 550 cat C15. He could still outpull me on a mountain, but he couldn't get away.

[@michaellangdonful]

@@ThatFenix wow that’s awesome.

[@EL-COMPA-D]

N14 turbo and bigger injectors with 5 button work nice 👌

[@pete00593]

What other upgrades for 3406b models are there? Turbo ,nozzles ,cam??? And who sells them?

[@jorgem838]

Modified injeccion pump. Exhaust manifold which Pittsburgh power makes. Cat marine nozzles.

[@maam2164]

Tdc or tc exhaust stroke?

[@leewilliams7443]

Quick question does this method apply to a 3306B Cat I have a 1990 Western Star dump truck set at 300hp I was wondering if this might help my little Kitty

[@deepsouthoutdoors5737]

I also have a 90 Western star 4864 with a 3306 and yep it will work

[@cruzbodden8673]

Doing 1 full turn on both how much hp you think it adds?

[@htcooley04]

Probably between 25 and 50

[@cruzbodden8673]

@@htcooley04 thanks!! Is it ok to go a turn and a half on both screws with out advancing the timing ?

[@rambladesmanmoe6291]

More power and a crap load of black smoke on acceleration

[@gorgonbazil2652]

You can have more power without the smoke if its tuned properly..

[@rambladesmanmoe6291]

@@gorgonbazil2652 good luck convincing a truck driver of that. 😂. I’m talking the old school drivers. To them black smoke was power. We know it wasn’t.

[@alfonsgar]

Can you advance the timing on these pumps?

[@jorgem838]

Yeah you can but I believe you might need special tooling for that. It can be super tweaked with meter timing but that's gonna have to be done by a cat guy. By now most guys that used to work on that engine are retired. You really gotta know what you're doing with these mechanical pumps.

[@jorgepineda8043]

How do I do this on a 3406e

[@kentucky8256]

Honestly how much horsepower does one stand to gain off just doing this?

[@Commetsgarage]

kentucky 82 well a good amount well over 500 hp but be careful a turn it two does a lot

[@ilikeboost4764]

superinventor1 I assume if you go to far out can cause a runaway. Or is there a block off plate?

[@platecrumb7161]

You don’t want to go too much,,, yes that little bit will amaze you. You have to be careful especially in the summertime though cause she will run hotter. Too much will burn a piston up.

[@leifkeskevaari5898]

522 to the wheels and not even maxed out. kzbin.info/www/bejne/n2GnnpefnpyKoZo

[@richieb6970]

A buddy of mine tells me to go 2 turns on fuel and 4 on the torque what can I expect

[@MARTINN7777]

Sketchy af

[@martin1234512345]

Not at all.

[@danielelliott3659]

Better know how to drive a fueled up motor or you will have to learn how to change pistons and liners.