Author Topic: Cat 3126 to 3126 B or E  (Read 1244 times)

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Offline gracerace

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Cat 3126 to 3126 B or E
« on: April 27, 2018, 07:57:46 AM »
Does anyone know if a 3126 B or E swamp in place of a 3126. I know the later engines have a 70 pin harness, rather then a 40 pin. But there are adapters for this.
Just curious if anyone has actually performed this swap.

Caterpillar holders their cards tight to their chest, can't seem to get this info any where on the internet.

Thanks,

Chris
« Last Edit: April 27, 2018, 08:31:51 AM by Brett Wolfe »

Offline Brett Wolfe

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Re: Cat 3126 to 3126 B or E
« Reply #1 on: April 28, 2018, 06:21:55 AM »
From Dave Atherton:

The caterpillar 3126 A model has a 40 pin connector, caterpillar 3126 B & E engines have a 70 pin connector to ECM.
No there not a adapter that can be bought or used between the 40 pin and 70 pin connector. also note there is a lot of interesting
You Tube video on how to bullet proof your Caterpillar engine. Going deep into subject, this is not happening other than
Someone that’s wants to market for profit to make people think there is a problem. There is no information or has there been any
problems within Caterpillar service system technical bulletins to back problems with there engines.

Dave Atherton Retired Cat Mechanic

Offline gracerace

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Re: Cat 3126 to 3126 B or E
« Reply #2 on: April 28, 2018, 07:27:12 PM »
Thank you, but with all do respect, there is a  70 pin to 40 pin adapter and visa versa, made both by Caterpillar, and also after market.

http://www.mawkindustries.com/cat.htm

Cat # 133-8109

Good read here:

http://www.modifiedenginerebuilders.com/3126Info.asp



Offline ziggyh

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Re: Cat 3126 to 3126 B or E
« Reply #3 on: April 28, 2018, 07:39:06 PM »
Would there be a need for an adapter if you swap engines and keep the ECM with its
 engine and supply the necessary power and grounds, the only reason I can think of if there is a problem with which data buss is available on the transplant engine and the intended recipient. Cat used CDL, j1708, and j1939. The recipient vehicle would need a compatible buss so the trans controller, abs if equipped, and other modules can still communicate.
ZiggyH

2007 Revolution LE
C9

Offline Brett Wolfe

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Re: Cat 3126 to 3126 B or E
« Reply #4 on: April 29, 2018, 05:52:04 AM »
From Dave Atherton:

Basically  person can connect just about anything but first let everyone understand what each pin does in the ECM for Caterpillar 3126 A model 40 Pin data cable connector (  let let the wisdom explain what each pin does ) answer is clearly marked.

Next Caterpillar 3126 B & E  models with the 70 pin data cable connector, and again your now working with more pins and more technical information ( the ECM clearly spells out what each pin does for the Caterpillar 3126 B & E engines.)

Next part to answering wisdom versus technical information the ,engine ECM is not the same and values
to many data pins is not present. I stand by my post.

Offline David.e.atherton

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Re: Cat 3126 to 3126 B or E
« Reply #5 on: April 29, 2018, 06:21:45 AM »
Gentleman, sometime aftermarket parts wisdom in some people’s minds a means to save money. Yes there is a gizmo made for just about everything but in a experience technician view point many problems about to come into play. Really have missed a point about above post, some place someone forgot to mention about the engine ECM which has programmed values only available to Caterpillar.

What this means connections of wiring adapter to adapt different engines with Caterpillar ECM that programmed for values to different engine S/N numbers and test assigned Engine Arrangement Number is not going to happen. Caterpillar ECM Information program has many factory pass word code that allow different programs that only Caterpillar Service tool ET can unlock. Basic my advice to the non-trained do it yourself mechanic the aftermarket wire adapter is available and cost lot of money Caterpillar
has safe guards inplace that will not allow engine ECM to operate correct.

The only way a person change out a used electronic engine for example Cat C-9 with a Serial Number of 9DG 03162  with another 9DG Number real close . The arrangement number is where the engine build to certain specs come into play and that is where things go south to these aftermarket products. This subject goes a lot deeper and information is only available from Caterpillar and not to public.

Caterpillar built in a safe guard into aftermarket modified prevent tampering with engine and that is the ECM.
   
Dave Atherton Retired Cat Mechanic 42 year
« Last Edit: April 29, 2018, 08:25:13 AM by Brett Wolfe »

Offline gracerace

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Re: Cat 3126 to 3126 B or E
« Reply #6 on: April 29, 2018, 01:03:20 PM »
Thank you both for taking the time to explain this more clearly. It does fall in line with lots I have read. I would imagine I have more then 100 hours researching this.Some have done this, switching computers, some have done it, and the dash didn't work. But this was on trucks.I was told the extra wires on a 70 pin, are for more data info to the dash. Cat can take care of all that, if you have deep pockets.I plan to keep them out of the loop as much as possible.

Next question is, will a 8.3 Cummings bolt to the trans and converter (same pattern). Per a friend, Foretravel did not reinvent the wheel to put a Cat in these coaches. I do plan to call James Triana at Foretravel. I have a retired diesel mechanic  helping me, and low voltage wiring is not issue for me. I can deal with that.

We have already replaced the injector O rings, cleaning the seats. Replaced one injector that I am not sure was bad. I had done a pyro test, and that cylinder was 100 degree's colder on warm up.
Seats weren't bad,minor carbon, but the O rings were 1/2 gone.It ran fine for a few days, but still burning 1 qt per 100 - miles. Cat did a blow by test, said I have a hole out. But we pressure tested each cylinder with all the valves closed (rockers out). They all seemed equal.Now after a few days, went to start it, and I can barely get it started. Smells flooded,raw fuel, run's like it's on 3 cylinders. It's not cold out.Once it clears out, it's fine.But still have the oil consumption issue.

I want to abandon the whole engine I have. Everything, computer, pump everything. I have found several complete low mile used engines, with same 1WMXXXX serial number (40 pin).Sounds like unless I can swamp to a Cummings, that would be the easiest route to take.I don't want to get into fixing or rebuilding this engine, because unless one is willing to buy a $500.00 manual ($350.00 used), there isn't much info out there. It took a friend at Cat, to just get the valve lash. That was even hard for him to get!
Thanks Chris



Offline Brett Wolfe

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Re: Cat 3126 to 3126 B or E
« Reply #7 on: April 29, 2018, 02:14:05 PM »
Chris,

Yes, your coach is one of the heavier ones on the 3126 which is 7.2 liters. 

James should be able to tell you want is involved in changing to the Cummins 8.3 liter.  Like using different spec Caterpillar engines in your coach, this could become really involved.

Accessory mounting likely to be different. 
Cooling system the same capacity and same controls?
Transmission ECU would need to be reprogrammed, as the Cummins, being longer stroke, will have a lower RPM operating range.

Indeed, brainstorm with James Triana at the Foretavel factory.

Guess my thought is, particularly if ready to scrap the engine, pull the head off and see what you have.  If a scored cylinder/bad piston, I was at Mustang Caterpillar in Houston years ago when they had an outside firm do an in-frame bore and sleeve insert in a 3126.

Offline gracerace

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Re: Cat 3126 to 3126 B or E
« Reply #8 on: April 29, 2018, 03:29:33 PM »
Thanks Bret, no one in this area does that (mobile boring). Crossed that one of the list a few weeks ago. Taking it apart has been a thought, but don't want it non-mobile. Especially apart in some one else's shop $$$$.Bad enough in mine.
It still has something else going on, like HEUI or ECM. Certainly don't want to throw parts at it guessing.
Code only while warming up, then goes away. 
ID 164
FMI 11 
N1 (injector activator pressure)
Which is:
Bad injector
Bad injector O rings
Bad sensor
Bad HEUI
Bad ECM
The 1st 3 have been covered, the fact I can drive it, and silverleaf shows good fuel pressure (within spec)
Unfortunately no one has software to look at ECM deeper, and Cat didn't do it when I took it in, telling them about the code. They just did a blow by test, said you need a new motor, have a dead hole. I did get my money back from them, they agreed they dropped the ball.
So from Cat work order:
Blow by at
Idle: 286 cu FT/HR
Med idle 347.1 cu FT/HR
Spec is 315 cu FT/HR at high idle under load...Min blow by is 160 cu FT/HR
I read double the HP, so a 300 HP would be 600 cu FT/HR
Never the less, has lots of blow by blue smoke out slobber tube (no oil, clean as a whistle), none out exhaust.
Thanks Chris

« Last Edit: April 29, 2018, 06:11:23 PM by gracerace »

Offline David.e.atherton

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Re: Cat 3126 to 3126 B or E
« Reply #9 on: April 29, 2018, 06:36:53 PM »
gracerace, reading your post on all the work you have done on your engine troubleshooting.
First of all engine blow by can come from another area other than the rings. Look at the turbo
charger real close, first a bad seal in the turbocharger will produce excess blow by and oil
usage as you stated. What you first indicated what you replaced injector o-rings, than your
silver leaf code 164-11 Injection Actuation Pressure Fault. Did you preform the work yourself.
The Code 164-11 can be cause from several problems. and replacement of one injector is
leading to another area of problems. Incorrect voltage to injector itself which will not fire the
Injector correct or not fire the injector all ( we have experienced several motorhome owners )
that changed out injectors to fined  out the injector was ok. The point want to make really do
not  think by what you have indicated your engine is bad. another area Injector Actuation
Pressure Regulator sticking or bad. Note your engine does not have a injection pump or
injector push rods and the only way your injectors will work is the high pressure engine oil
that operates the injector. Will sometimes produce. Code of 42-11 or 164-11. I can keep going
deeper and can provide technical Information from Caterpillar Service Information System.
Will advise to rebuild your engine using many parts off your engine will run $ 30,000. Plus
many extras. Again if you can provide a step by step where you are at and where did you
start need complete engine serial number. Ask Dave, Dave Atherton Retired Cat Mechanic

Offline gracerace

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Re: Cat 3126 to 3126 B or E
« Reply #10 on: April 29, 2018, 08:27:43 PM »
Thank you Dave
Your the 1st person I have talked to, that is giving me sound advice. I find it hard to believe, this engine went bad just like that. It has 118K miles.I bought it from a retired grape grower in Lodi Calif. with 112K miles. He  has multiple tractors and a shop. he took good care of it, and drove it easy. He owned it most of the last 50K miles.He upgraded to a newer coach, because he wanted slides.
I bought it, drove it home 1+K milles, no issues, no oil use. Drove it a few hundred miles around home, no issues, then another 2K miles down to Arizona year before last, no oil use.Driving home from Arizona,It started throwing a low boost code.

Got home,the manifold gasket was blown, so we pulled it off, I had it resurfaced, problem solved.While I had the turbo off, decided to have it freshened, just because it was off. It looked fine.At that point the waste gate was cracked, so I got a complete rebuilt turbo (not Chinese) from a reliable dealer in Spokane, Spokane pump. Been around since the 40's.
Serviced the whole coach (every fluid), changed the oil and filter twice in 2K miles. I am just that way.When we got to California this year, at about 1K miles, it used 4-5 qts oil. Slobber tube is clean as a whistle, exhaust pipe clean, no smoke. Just bad blue smoke out the blow by tube, dip stick, and oil fill tube. I bought 4 cases of oil, and made sure it was full, drove about 1500 miles back home. Used 27 qts oil. never got lower then add line.I drive it very easy, 1700 RPM's
I read about the O rings and oil consumption, so decided to try those.While doing the injector O rings, we checked the charge cooler tube's for oil. Minor oil at the turbo, none down the pipes. Called Spokane pump, they said that is normal.Really was minor at the fins.
Tried to have the injectors checked, but no one does them locally, they wanted to send them out.Seeing the O rings so bad, and the fact the engine was running smooth, had no reason to believe the injectors were bad. I replaced the one with the correct reman Cat part number, because on warm up, one cylinder was running 100 degree's colder. I had already received the injector, so I put it in just guessing.
It seemed to run better, fuel now smelled like fresh burning fuel. The O rings were cracked and missing pieces.Replaced with Cat O rings.But still 1 qt oil every 100- miles.Then the second day, started hard, running on what sounds like 3 cyl. Once cleaned out, it seems to run fine, but smoke seems worse.
Yes, did the work with my friend who is a retired diesel mechanic. We are both drag racers, and have built many gas engines.My friend is pretty knowledgeable with diesels, but not specifically with Cats, but has worked on them. But has done this type of work (O rings) on other brands.I personally was a Foretravel tech, did all the service on theses coach's. But we did not do major engine/trans work.
The motor is a 1996 early 97 Foretravel coach.(on valve cover) 300 HP 3126 serial number 1WM03813
Thank you so much for your time. This has been a bummer, as we bough the coach to have a bullet proof chassis. The engine was suppose to be my least worry.
Chris

Offline David.e.atherton

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Re: Cat 3126 to 3126 B or E
« Reply #11 on: April 30, 2018, 01:22:08 AM »
Gracerace, you can get with head of forum Brett Wolfe and get information on how to contact
Ask Dave, Dave Atherton Retired Cat Mechanic.  I will assist you with your engine
Problems.

Offline gracerace

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Re: Cat 3126 to 3126 B or E
« Reply #12 on: April 30, 2018, 06:44:37 AM »
Thank you so much. You made my day.....

Offline ziggyh

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Re: Cat 3126 to 3126 B or E
« Reply #13 on: May 02, 2018, 06:37:39 AM »
One of the thing I believe in is doing and oil sample very other year as a precaution and to help pinpoint if there are problems starting. Regarding excessive oil consumption I would also do a fuel sample analysis to see if oil may still be getting into the fuel and thinning out.  Beside the areas of concern already mentioned were the injector cups cleaned and inspected for damage before installing the injectors.
Was the proper grade and viscosity of the oil used in the oil change and calibration of the dip stick.
Blowby can also be caused by worn valve guides.
ZiggyH

2007 Revolution LE
C9