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Post by Tony on Apr 24, 2011 17:02:44 GMT -5
I have a 425 HP / 3406B CAT in a 1990 yr model - 379 Petebuilt. What can I do to get more performance/fuel mileage out of this engine without destroying my motor?
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Post by Mountainslayer on Apr 24, 2011 19:59:15 GMT -5
Powering up a Cat 3406B with an attitude.......
There are 2 allen head screws behind that plate that have 3/8 (on most pumps, 7/16 on others) lock nuts on them. Carefully loosen the lock nuts with a deep socket, then remove ratchet and insert the allen wrench through the socket so you can hold the lock nut in one place. Turn both screws EXACTLY the same amount of turns. Usually start by going 1 full turn on both, then run it. Any additional turns afterward should be no more than half. Don't get greedy, you'll burn it up. You can get well over 500Hp playing with those B model pumps, but don't come back here blaming me if you don't know how to take your foot out of it and let it cool down. The last B model I had, the screws were turned all the way out, and I hung a C model turbo on it, I was getting a little over 600Hp. But it would get hot, if not careful.
Take the line and 2) 1/4" bolt cover off the air fuel ratio on the very back and top of the gov. Nothing there to be scared of. Grab the plunger stem with pliers and break the 7/16" jam nut loose with box end wrench, Turn screw all the way in until just leaving enough threads to lock down. Not real precision, just set it anywhere tight. Re-assemble...
On the very bottom of the rear of the gov. towards the outside (frame side) is another 1" tall 1/4" bolt cover. Remove the bolts, one on top of the other this time, and smack down on the cover with a screwdriver and hammer. The harder the better. It'll leave the gasket perfectly intact for reassembly that way. Again, nothing to screw up so have at it. Facing in from the back stick your pinky in the slotted hole and push in on that thing. Just face the front of the truck, turn palm up and stick it in. Again, and just to clarify, this is all idiot proof and you can't mess anything up on any of this.
So, you'll feel the rack screw bar with the fuel and torque screws.
Just push on whatever you run into in there. The more travel, the more servo movement. All you're doing with your finger is making sure another bonehead wasn't in there playing. Make sure when you push it all the way in (about 5/16" travel plus change is about 425hp stock, but doesn't really matter how far it does go) you can feel about .030" or so (just picture a .030" gauge and guess, really) of secondary spring pressure. That is the torque spring on the stop bar. It doesn't have to be exactly anything, just want that little bit of extra pressure for torque rise. I won't explain it all, but your feeling torque spring pressure from the screw making sure someone before didn't turn one screw out from the other (doing it wrong).
There are two screws side by side. If there is no pressure there, turn the outer most screw (towards you) in until there is. Do this with a 1/4" drive 3/8" deep socket (12 point is easier) with baby vice grips clamped to the very end as the lever and something simple like a 7/64" Allen wrench down the center. Just take your Allen set and stick it in the end of the screw to find the size (or call your local dealer, ask for truck shop and just ask em what size). Insert socket, break loose counter clockwise with Allen wrench in hole, turn screw and lock back down. If your torque pressure feels OK, or you reset it as stated, back out both screws evenly to the tune of about 20hp per turn or so. Wipe off housing and cover and stick back on with original gasket. No glues on anything anywhere here.
If the truck’s in good shape, go 3 turns or so and run it a round. If your pyro stays below 950, meaning it's timed close enough to stock or advanced properly, turn it out another 3 and call her good. That's it. Have fun. It can be super tweaked with meter timing and gov. removal, but you'll be pretty happy like this unless you run into me on the road somewhere.
Want peace of mind and better mileage, take it to someone trustworthy (Cat dealer, and tell em you wana old timer on it) and set a tight overhead ($225 or so) and meter time ($100) to (for your 92) 17.5 degrees at 1000 and start at 1230, plus remove the stop screw and toss it. This won't make sense to you but that's exactly what you tell him. He'll know just what you're saying, believe me. That'll land you between 5.2 and 5.7mpg depending on what you haul, and between 530 and 560 hp. You'll know it all worked when it goes from 20psi boost to 27 the first time (3 turns) and 32+ the next (3 turns). Add an 0R6051 turbo for a couple more pounds and better power (will now be a core charge tho). And don't worry, it'll all take it just fine.
With more exaggerated tuning, she'd pull 800hp just as it sits with no motor mods whatsoever and live to 750,000 miles without a hitch. If you're running 15psi boost right now and the first 3 turns didn't increase the boost, have the dealer replace you air fuel ratio diaphragm ($100). Have fun........
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Post by jk342 on Apr 25, 2011 6:46:52 GMT -5
i have a b series that runs great but i am going to ck this out. never hurts to have a little more power,thanks for the info
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Post by Cowboyken on Sept 22, 2013 21:03:26 GMT -5
I can only find one of the locked Allan screws you mentioned on my 3406b. It's behind the solenoid. Where is the second one?  And also, what way do you turn the Allan screw to gain power? |
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Post by robert on Nov 26, 2013 6:50:05 GMT -5
call pittsburgh power. sorry don't have the number but easy to find on the web.those guys are always helpful when i have asked them questions. i want to purchase a larger turbo from them when it comes time to rebuild mine. they are great engines and plenty of parts around for them. a lot better then the stuff built now. who the hell has thirty thousand to out in an engine. gimmie the old motors anytime..
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Post by Kevin on Jun 11, 2014 22:03:43 GMT -5
What can I do to get more power out of my 3406c engine?
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Post by Jerrybob on Aug 4, 2014 23:32:58 GMT -5
I have 95 western star it has a 3406c that has been turn in to a b motor it only runs 65 at 2000 rpm what can I do to run faster
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Post by COETodd on Apr 4, 2015 23:29:56 GMT -5
Jerrybob,
You're likely limited by your rear end gearing. Something like a 3.73 or a 3.55 rear gear would help. Or an overdrive trans.
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Post by piratecdl on Dec 19, 2015 8:31:54 GMT -5
I had a western star with an 18 spd and 3:55 rears,ran around 1400@65 and it got there quick
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Post by Gavin on Feb 2, 2016 23:31:18 GMT -5
Have a 3406b what hp is this producing and what revs should it pull in neutral
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Post by Jimmyc63 on Feb 24, 2016 14:43:53 GMT -5
pittsburgh power is definitely the guys to call.
I have a 3406b that was getting 18psi boost, it was slow to respond, and felt weak. I got a mapped turbo, a set of injectors, a balancer, and a damper, for less than half what the Cat dealer wanted here in Vancouver.
After the install, I have 27 psi boost, and it pulls like a scalded dog. You want to roll on the throttle easy so it doesn't kill everyone following (smokes a lot, I will turn in the fuel settings) but it pulls like a locomotive. Very pleased.
Plus it runs smoother, and sounds better.
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Post by mrdynamite412 on Apr 9, 2016 20:01:36 GMT -5
do they make a waste gate spring actuator kit to turn the boost up on my 3406 b turbo
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Post by catman3406 on May 16, 2016 0:50:27 GMT -5
To make big power you need cool air...an ATAA set up...a real cat mechanic to turn up fuel del 6-8%...retarded pump timing to overall 10-14° and you got a motor that will out pull a 6NZ...never over heat...blow ZERO black smoke. We dyno'd my 85 shaker at Great lakes Engine and it was pushing close to 650 at the wheels...a million mile motor. Ever in portage, Indiana...go see the head mechanic in Bowling transports shop..KC is certified cat..can turn one up after hours and 're seal pump with cat seals if motors under warranty...real power, not Rollin coal.
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Post by catman3406 on May 16, 2016 0:59:38 GMT -5
Also guys any mechanical cat should be operated between 1500-2100rpm...optimal hey crusing engine speed should be 1500-1600rpm. The only way to achive more vehicle speed is gearing. I personally pulled 100K+ gross and the optimal gearing for me was a 15overdrive, 3.73:1 rears and 11R24.5 tires. For a 80k gross RiG, I'd go 3.55:1 rears.
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Post by Neil on May 17, 2016 20:09:48 GMT -5
On my 3406b. I pull the cover off the back of my injector pump to find it was glued on and the locknut and adjuster screw was broke off. What kind of trouble am I gonna have opening up the governor housing?
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Post by petepullinloggs on Aug 26, 2016 4:51:58 GMT -5
Ok I have a 92 pete with the 3406b where are the screws and to turn up I need like pictures im mechanicaly incline but first rodeo workin on rig usually sbc and how do I set lash on jakes mine wont hold back I fart running up hill in sand without divider or ignition on
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Post by Randy on Mar 31, 2017 21:52:02 GMT -5
Ok I have a 92 pete with the 3406b where are the screws and to turn up I need like pictures im mechanicaly incline but first rodeo workin on rig usually sbc and how do I set lash on jakes mine wont hold back I fart running up hill in sand without divider or ignition on |
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Post by kw on Oct 19, 2017 20:46:03 GMT -5
I have a 93 kw 425c runs fine temp stays down till you bring it up to 75mph gets abut 200 203 you back off it goes back down to 185 any ideas
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Post by Calvin Corbitt on Jan 4, 2018 12:03:30 GMT -5
Can I use a 500 horsepower turbo and injectors on my 3406b model cat
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Post by Go on Apr 8, 2018 23:23:53 GMT -5
Can I use a 500 horsepower turbo and injectors on my 3406b model cat |
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Post by Shawn on Sept 22, 2018 5:38:19 GMT -5
Can I use a 500 horsepower turbo and injectors on my 3406b model cat |
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And also, what way do you turn the Allan screw to gain power?
