paul

Lebanon, OR

#400 Aug 28, 2010
I have fuel in the water of a 3126, fl60 freightliner. Where is this coming from. Engine has 280,000 miles.
yankeeclippers

Mcminnville, TN

#401 Sep 1, 2010
Ben wrote:
<quoted text>
I could use some of the same help. A friend wants me to check out his 01 t6500 rollback with 3126 cat. Crank, no start. Pops off on either but wont stay runnin. He said it died on im coming home one night, they got it restarted on either a couple times.. ran like crap to get it home. Now it wont stay runnin at all. How do I test sensors and pump? Got fuel in all filters, tanks clear full of fuel, holdin prime at prime pump. thank you. dcmay@netins.net
I changed the sensor at the top near valve cover driverside in front believe it is a fuel pressure sensor if it leaking oil change it I changed mine and it runs like a scalded dog. Oil changes are key to this engine you must keep clean oil in them I have learned the hard way by not maintaining the trucks. All i own are 3126b oil injected good engine maintenance a must.
Possum

Canada

#402 Sep 5, 2010
I have a 07 3126 in a medium truck. I have had lots of problems with it. The truck has only 145,ooo km's. Cat has not been helpful. It does not burn oil however it does blow oil out of the blow by tube. Very exessive at times. Up to 5 liters per day. It smokes out of blow by tube all the time. The odd thing about this is it does not do this all the time.
Comments or suggestions would be appreiciated.

“questions & answers”

Since: Sep 10

new haven county

#403 Sep 13, 2010
Thank you in advance for any ideas or pointers to a problem I have. 1999 Sterling L7500, Cat 3126dg engine, 6 speed manual car carrier. 164k miles. Cranks, no start intermittantly. Clean oil, good injector control pressure, good fuel pressure. sometimes give it a little throttle and it will fire. sometimes just cranks away. little shot of either- fires right up. when running, runs just fine always. never skips, always has decent power. notice raw fuel smoke out exhaust when cranks no start. also, intake heater is working fine. will happens when up to temprature sometimes also. Scan data shows 175/200 rpm while cranking. was able to retrieve a "34" flash code by manipulating cruise cont. buttons. any ideas? thank so much.-Keith

“questions & answers”

Since: Sep 10

new haven county

#404 Sep 15, 2010
update: "scan data"= a matco genesis 4.0 scan tool with 2009 heavy duty generic software.
Checked engine speed & timing sensor signals with a lab scope, looks like they are both making approx 1.5v while cranking with a decent pattern, and can clearly see the signature as it cranks. only thing is, i can only scope out one sensor at a time. so, i cannot tell how the sync is. thanx again!
curt

Arvada, CO

#405 Oct 11, 2010
2003 3126 goes into limp mode when climbing grades. it has new oil pump
Kiwi Marine Services

Timaru, New Zealand

#407 Oct 15, 2010
Mike wrote:
We are looking into purchasing a Freightliner FL70 that has a Cat 3126 engine. My question is, how reliable is this motor? When talking to some folks, I have heard quite often that Cat had some problems with some engines a while back. This truck is a 2000 model. I know that Cat is a great name, and reliable. Is there anything anyone can tell me, pro or con, about this particular engine? Thanks a lot!!
Mike
We run these engines in two commercial boats one of which is a rescue vessel I look after and they are proving to be very reliable in a harsh marine environment. Couple of things though. You must be religious in your service intervals and don't be tempted by devices/systems that offer extended service intervals. Also use oil that very closely matches the Caterpillar oil specs. Oddly they don't like the very high grade oils either mineral or synthetic. In the marine version Goughs in NZ specify thier special application oil SAE30. This is because the oil is rebreathed into the air intake and synthetic oils break down under very high temps as it goes through the turbo and coats the inside of the aftercooler with basically plastic. Clearly not a desirable outcome. However I'm not sure if they rebreath them the same way in truck engines but should still be a consideration.
Also consider fitting an oil spinner cenrifuge. This will increase the service life of the fuel system which is very expensive to repair/rebuild and will dramatically increase engine life.
Lastly don't try and extract more horsepower from it through aftermarket tweaking they simply won't take it.
On one other note if you blow a head gasket which has been noted by Caterpillar as a not uncommon but not entensive problem there is a new procedure out for torquing the head bolts which needs to be followed carefully which resolves the problem.
Our experience is these are a good engine that require a careful and considered maintenance regime carefully following Cat service reccomendations. But like I said my expaerience with these engines has only been in the marine environment and I don't have any reports of these in the transport industry.
barth

Surrey, Canada

#408 Oct 18, 2010
I have this 2000 gmc with cat 3126B engine hard start or no.start.I have being to local dealer three times with about 2500 dollers each visite.When prime some times it start hard,you can hear the noise of injector working by force for sometime.And when I pluge it on a power for about 6 hrs it work normal when i start it.Ples, any body have idea what to do next?as am taire of it.
ron

Atlanta, GA

#409 Oct 22, 2010
I have a FL 70 with a 3126 eng and its great i have not had any problems i had it for about 8 months at
Dustin in Mo

Drexel, MO

#410 Oct 26, 2010
I have a sterling with the 3126 has always ran good but recently it has a lack of power on the top end and is doing what I guess would be surging under load you cant feel it but with the window down it sound like woosh wooosh wooosh under load as soon as you let out off a little it stops it has regular maint. no codes but pulling little grades at 55 and hils at 40 it getting old it doesnt smoke or use excessive fuel
Per

Linköping, Sweden

#411 Oct 27, 2010
barth wrote:
I have this 2000 gmc with cat 3126B engine hard start or no.start.I have being to local dealer three times with about 2500 dollers each visite.When prime some times it start hard,you can hear the noise of injector working by force for sometime.And when I pluge it on a power for about 6 hrs it work normal when i start it.Ples, any body have idea what to do next?as am taire of it.
Check the air inlet heater so it is activating, also check the pressure regulator valve on the fuel return line from the head, they are known to leak a little making the engine loose it's prime when sitting overnight, if it starts easier after you prime it manually it is this.
Per

Linköping, Sweden

#412 Oct 27, 2010
paul wrote:
I have fuel in the water of a 3126, fl60 freightliner. Where is this coming from. Engine has 280,000 miles.
Your injector sleeves are leaking.
Changing them requires a special tool but it is no more than 3-4 hours work if engine is reasonable accesible.
Per

Linköping, Sweden

#413 Oct 27, 2010
jackstraw762010 wrote:
update: "scan data"= a matco genesis 4.0 scan tool with 2009 heavy duty generic software.
Checked engine speed & timing sensor signals with a lab scope, looks like they are both making approx 1.5v while cranking with a decent pattern, and can clearly see the signature as it cranks. only thing is, i can only scope out one sensor at a time. so, i cannot tell how the sync is. thanx again!
Interesting, I had an excavator with this engine doing the exact same thing but after a couple of days it went away and have never occured again...
Per

Linköping, Sweden

#414 Oct 27, 2010
Dustin in Mo wrote:
I have a sterling with the 3126 has always ran good but recently it has a lack of power on the top end and is doing what I guess would be surging under load you cant feel it but with the window down it sound like woosh wooosh wooosh under load as soon as you let out off a little it stops it has regular maint. no codes but pulling little grades at 55 and hils at 40 it getting old it doesnt smoke or use excessive fuel
Check fuel pressure and also return line for air while engine is under load.
DumpTrucker

Portland, OR

#415 Oct 27, 2010
We have a 2000 Sterling dump truck with a 3126 (heui)Cat engine. The truck has a GVWR of 56,000 lbs. It is woefully underpowered, and has been a royal pain as far as dependability. The truck has been well maintained, yet it has lousy oil pressure, the heui pump has gone out 2-3 times in 5 years, leaving the truck dead on the side of the road each time, needing a service call or tow. Then when any of the components of the oil pressure driven injection system fails, you are also left dead on the road, or at best, with not enough power to climb over a speed bump. The engine has cost me thousands of $ in repairs and downtime, and now with only 330K miles on it, is looking like it needs to be replaced. I will never own another 3126 engine. The ONLY good thing about it is, if you run too low on oil, the engine shuts down because the injectors wont actuate, thus saving the engine. We've had just about every Cat engine made in one of our trucks at one time or another, and they've all been fantastic except for the 3126. I suggest you stay away from it.
Yooper

Munith, MI

#416 Oct 27, 2010
CatTech wrote:
any electronic Caterpillar engine questions i can help
This morning i started my 2005 westrnstar c-15 and after the low air alarm quit i heard it beeping in a more frequent tone i noticed from the passenger step side the check engine and stop engine light was on. by the time i got the the drivers side it was gone. i check codes by holding the resume button down and i got 5-5 which i hear is no codes. any suggestions?
possum

Edmonton, Canada

#417 Oct 28, 2010
DumpTrucker wrote:
We have a 2000 Sterling dump truck with a 3126 (heui)Cat engine. The truck has a GVWR of 56,000 lbs. It is woefully underpowered, and has been a royal pain as far as dependability. The truck has been well maintained, yet it has lousy oil pressure, the heui pump has gone out 2-3 times in 5 years, leaving the truck dead on the side of the road each time, needing a service call or tow. Then when any of the components of the oil pressure driven injection system fails, you are also left dead on the road, or at best, with not enough power to climb over a speed bump. The engine has cost me thousands of $ in repairs and downtime, and now with only 330K miles on it, is looking like it needs to be replaced. I will never own another 3126 engine. The ONLY good thing about it is, if you run too low on oil, the engine
shuts down because the injectors wont actuate, thus saving the engine. We've had just about every Cat engine made in one of our trucks at one time or another, and they've all been fantastic except for the 3126. I suggest you stay away from it.
I have the same engine in an 07 KW. dump. 4 heui pumps, one turbo, injectors twice, water pump. The engine had glycol run through it when the water pump went (inner seal). 145,000 km's 4500 hours. Not impressed at all. It had been serviced more than the required scheduled intervel required by cat. It started to act up again, and I just heard from KW the engine is dusted. How, they do not know. Perhaps the glycol will tell.
Engine is a joke up here in Canada anyways. No warranty left.
Donaldpace

Tazewell, TN

#418 Oct 28, 2010
have a 2000 Kw T2000 with a c-12 cat has 1,000,000 plus miles, its using 1-2 gallons of water if you run hard all day what is wrong ive talked to everyone and they say liners or head or head gasket but its not putting none in the oil or putting back pressure on the radiator what do i do? my email is youngteen182006@yahoo.com email me asap if you know thanks
jared

United States

#419 Oct 28, 2010
CatTech wrote:
any electronic Caterpillar engine questions i can help
I got a 3126B. Sometimes it starts just fine other times it won't start at all. It will run fine stop at shop and won't start after being off for 5 mins 1hr. Dosent seem to matter. Let sit sometimes it fires sometime not. It's so very random. Please email me at jaredbabich@hotmail.com if you got some tips for me or troubleshooting.
constable

Freeport, Bahamas

#420 Nov 4, 2010
I have a 2003 freightliner firetruck I am working on had a miss on the number 5 injector, change number 5 and 6 injectors it run fine for that hole day. The next morning I sarted the truck and it started to somke a heavy gray smoke, any one could help me.

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