Cat 3406B
tyler

United States

#82 May 5, 2012
i have a 3406b. have had trouble with the nozzles going bad. they thought it was the reman nozzles were junk. ive gone thru 7 nozzles in 4 weeks. put a brand new set in and 300 miles one went bad. the motor has 160,000 on complete out of frame overhaul. thank god for warranty but i cant be down every week. what would cause this. every fuel line is new,new transfer pump.
Ken

Marion, IN

#83 May 5, 2012
tyler wrote:
i have a 3406b. have had trouble with the nozzles going bad. they thought it was the reman nozzles were junk. ive gone thru 7 nozzles in 4 weeks. put a brand new set in and 300 miles one went bad. the motor has 160,000 on complete out of frame overhaul. thank god for warranty but i cant be down every week. what would cause this. every fuel line is new,new transfer pump.
Have you had the valves/injectors adjusted recently? If it hasn't been done since the overhaul, it should be done now. Most of the older mechanical Cats were adjusted on a 150,000 mile interval. Injector height is critical to the operation of ANY diesel engine!

It could also be that the fuel pressure along the rail inside the head is too high or too low, causing premature wear & failure of the nozzles. Have you had the fuel pressure tested physically with a gauge? The fuel pressure at an idle should be around 75 psi, and 100 psi @ 1800 rpm. Injectors & nozzles utilize fuel as a "lubricant" for their moving parts, we've changed injectors on the newer C-15 engines due to low fuel pressure, causing excessive wear.

The fuel pressure is not controlled by the transfer pump, there is a "fuel pressure regulator" located in the return fuel line after it leaves the head of the engine & before the fuel tanks. Good luck with your truck!
marchel

Porterville, CA

#84 Jun 24, 2012
Hi, i have a 3406b just put reman injectors and 5 days in to working #4 injector broke the black tip off, the needle is still there.. What do you think would cause this? thanks
Ken

Marion, IN

#85 Jun 25, 2012
marchel wrote:
Hi, i have a 3406b just put reman injectors and 5 days in to working #4 injector broke the black tip off, the needle is still there.. What do you think would cause this? thanks
I'm assuming that the injector height was adjusted when you had the injectors installed? If they were adjusted, then the reman injector was defective. If they were NOT adjusted, then the injector could have been damaged by excessive plunger travel inside.

On a 3406-B the "injector nozzles" are removeable, and can be replaced easily. You can replace just the "tip" of that injector, unless it's covered by warranty!
brad

Sebastian, FL

#86 Sep 7, 2012
i have 3406 b mechical cat 1995 loses a gallon of in 200 miles no blow by rebuilt at cat 400,000 miles ago i tighten fan drive is when problem started oil is coming from front of motor
adolfo medina

Belize

#87 Jan 29, 2013
weri good information i have benefit of it
redneck

United States

#88 Jul 2, 2013
I have an 88 w900 with a 3406b. I have a injector loading up at idle. Im used to working on big cam cummins but lost with this cat. How can i pin point wwhich cylinder is loading up and how do i determine if its a nozzle or an injector ?

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#89 Jul 3, 2013
redneck wrote:
I have an 88 w900 with a 3406b. I have a injector loading up at idle. Im used to working on big cam cummins but lost with this cat. How can i pin point wwhich cylinder is loading up and how do i determine if its a nozzle or an injector ?
It has to be the injector causing it to "load up", the nozzles only affect the "spray pattern" of the fuel inside the cylinder. The easiest way to identify it on a mechanical engine is to use an "infrared temp gun". They can be purchased cheaply, and you can point it at each cylinder on the exhaust manifold to tell which cylinder is running the "hottest"...this will be the one receiving more fuel.
fuel nozzel adapters

Tioga, ND

#90 Aug 17, 2013
i recently bought a reman head for my 3406b and the fuel nozzel adapters are not installed, so my question is can I use the old ones in the old head? if so how do I get the old ones out and install in new head?
fuel nozzel adapters

Tioga, ND

#91 Aug 18, 2013
never mind i figured it out, i built my own tool,
Joe

Prairie Village, KS

#93 Oct 18, 2013
Have a 3406b replacing air commpresser and it won't go back together shafts are the same c , can't seem to get lined up is there a trick
Ken

Marion, IN

#94 Oct 18, 2013
Joe wrote:
Have a 3406b replacing air commpresser and it won't go back together shafts are the same c , can't seem to get lined up is there a trick
No real tricks, you just have to rotate the gear in small increments then try to "slide" it back in. This is especially true when you have to slide the compressor over studs extending from the front cover. The newer Cats use 1 stud & 2 bolts.

It doesn't matter which way you rotate the air compressor gear, as long as it lines up & slides in smoothly. Never force two gears together. Good luck!
randy

Summerville, SC

#95 Feb 26, 2014
what keeps breaking crank and busting out end of air compressor 1990 3406b

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#96 Mar 4, 2014
randy wrote:
what keeps breaking crank and busting out end of air compressor 1990 3406b
Breaking the crank of what? The air compressor, or the engine?

If you're buying Reman compressors, keep in mind that they've probably been rebuilt at least 2 times, or more...given the age of your truck. A new one (if that style is available) could be a good investment!

If you've had this problem with more than one compressor, then I would pull the front cover off the engine & inspect all the gears. If the bearings or bushings are worn, the gears can "move" enough to put extra pressure on the air compressor drive gear. Good luck!
debo

Southfield, MI

#97 Jun 11, 2014
my 87 freightliner stalls under load doesn't lose prime runs fine till I try to work it then acts like it starves for fuel wait a min or two starts right up strong as ever everything is mechanical so what could be the cause
Kevin

Brandon, MS

#98 Jul 8, 2014
I have a 95 freightliner with 3406b engine I'm getting oil in my radiator I changed the oil cooler and had the head checked still getting the problem anyone know what else it could b
snuffy73

Monroeville, AL

#99 Jul 8, 2014
I have a 3406b that is getting engine oil in the fuel tank.any answers?
Terry

Port-of-spain, Trinidad and Tobago

#100 Nov 20, 2014
My 3406 cat engines black smoking and loosing power on acceleration
Toni

Los Angeles, CA

#101 Jan 15, 2015
I remove a bad injector i think was the problem bad the injector i change still no working some ideas?
adeem

Multan, Pakistan

#102 Jan 17, 2015
Which parts or adjustment needs if use a cat 3406b 14.6 litter truck engine with mechanical fuel injection pump for genset use wants to run at 1500 rpm what bhp can get ?

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