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Engine Diagnostics / Re: does not start my cat 3126b
« Last post by David.e.atherton on February 16, 2018, 06:12:22 PM »
espanol, reviewing the test results on your engine time when it was shipped. Your
spec on test results ( spec number OK-2787 ) Engine arrangement number assigned
to your engine 164-7858. What concerns me is the diesel fuel pressure from fuel transfer
pump on engine, which requires a constant fuel pressure of 87 psi. at 2800 rpm. The engine
slowing down than stopping when warm along with white smoke tell me your fuel transfer
pump cannot maintain correct diesel fuel pressure. Again install a pressure gauge at secondary
fuel filter and pressure at this point should be 87 psi at high rpm of 2800 rpms.  Installing
a clear plastic hose ( hose where you can see through ) at end of fuel,pressure return
regulator on rear of engine head. This action should take you into the problem. Note:
you mention of lot of work preformed on your engine. Do you have a paper work on
all work done and was it done by a caterpillar trained mechanic.  Ask Dave Dave Atherton
Retired Cat Mechanic.
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Engine Diagnostics / Re: does not start my cat 3126b
« Last post by David.e.atherton on February 15, 2018, 04:56:10 PM »
espanol, you indicated engine will start when cold after warm up engine and stopping
engine warm will not start along with white smoke. First did check all your injectors
power connections making sure there is power to all injectors ( this area where white
smoke is coming from.) with engine running install a clear plastic hose to the return
fuel pressure regulator and run fuel into a catch pan. The white smoke is telling me
you have air within the fuel system and fuel transfer pump cannot provide enough fuel
after engine warms up. Think fuel is not being pulled into engine at correct pressure. Last
Question, you indicated engines are putting out 450 hp, is this with both engines running
together or each engine is putting out 450 hp. Can you give me your engine serial
number of each engine so I can pull up builder spec as to Rated hp. Think that building
up engines may not fall within builder spec’s. Ask Dave. Dave Atherton Retired Cat
Mechanic
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Engine Diagnostics / Re: does not start my cat 3126b
« Last post by Ken Carpenter on February 15, 2018, 02:24:42 PM »
elspanol replied:

The problem persists, the engine starts well in cold, but now when it warms up a bit, and I stop it, then it does not want to start, it turns to 25oce h0 revolutions when it starts, it smokes (it is injecting) but it can not start.
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Engine Diagnostics / Re: does not start my cat 3126b
« Last post by español on February 15, 2018, 01:51:28 PM »
The problem persists, the engine starts well in cold, but now when it warms up a bit, and I stop it, then it does not want to start, it turns to 25oce h0 revolutions when it starts, it smokes (it is injecting) but it can not start
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Engine Diagnostics / Re: does not start my cat 3126b
« Last post by Ken Carpenter on February 14, 2018, 04:21:34 PM »
This request was originally posted under the AskDave, I’ve Got a Problem Board. Dave Atherton has posted his reply there. Here’s a link http://forum.dieselrvclub.org/index.php/topic,7607.msg19226.html#msg19226
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Engine Diagnostics / does not start my cat 3126b
« Last post by español on February 14, 2018, 12:32:51 PM »
good afternoon and
   sorry for my english
I bought a boat with 2 cat engines 3126b 450 hp and loscar engine engines were disassembled, we recostruido cylinder heads, segments, injectors, turbos, etc.
now the motors are mounted and it is very difficult to start in cold.
all the injectors are recon, the diesel pressure is at 2 bar, and the oil pressure without start is about 85 bars and when it starts it is set at 125 bars at the minimum speed. I have changed valve and IAP sensor and the problem is the same, the engine turns well, the injectors are heard, it smokes but it does not start and when it starts it seems to have little power.
what problem can I have
I have tested the return of diesel and good gasoil flow and without the presence of air, I even put a new valve.
in the mornings it starts well, but after a while it makes a slowdown of revolutions and stops, afterwards it is impossible to start.
  sometimes it turns and makes white smoke, but it does not start and sometimes it starts more or less fast, but it remains at 500 revolutions and it goes down little by little until it stops and if you give it a start again, you do the same.
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Links of Interest / Re: RV SERVICE - User Service Reviews
« Last post by BlueFlame on February 14, 2018, 06:27:23 AM »
Hello,

Does anyone have a recommendation for a diesel engine mechanic in the Arcadia Florida area?

Any leads would be appreciated.  Thanks.
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Hey Dave, I've Got a Problem / Re: fuel leak?
« Last post by David.e.atherton on February 13, 2018, 06:53:03 PM »
Blue Flame, your engine has a history of injector lines cracking at the nut that
connects to the injector. The steel injector fuel lines being very short are under
stress when tighting. Going deeper into the problem would recommend buying
and replacing all the injectors lines. Ask Dave. Dave Atherton Retired Cat Mechanic
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Hey Dave, I've Got a Problem / fuel leak?
« Last post by BlueFlame on February 13, 2018, 11:05:25 AM »
Hello,

I have a super C built on a 2004 Freightliner Columbia CL120 class 8 truck chassis.  It has a Mercedes Benz MBE4000 12.8 L engine.  In the attached photos I have included a picture of the truck tag (VIN), the engine data tag, and an injector tag.  I also included three views, at different distances, of the problem.

I noticed a slight discoloration on the side of the engine for some time but didn't know what the problem was.  Recently after a long trip I noticed that the side of the engine was slightly wet (never saw this before, leads me to believe the problem is getting worse).  Looking more closely I saw a drip on the bottom of the plastic shroud that covers the injectors.  When I removed the front part of the shroud I could see the front injector (nearest to the front of the engine) was the only one discolored, as seen in the attached pictures.

So I'm looking for advice on possible problems/fixes.  I'm quite capable mechanically but don't know much about diesel engines specifics, so I wanted advice before I started putting wrenches on things.  Should I try tightening the fuel line connector?  To what torque?  Are fuel leaks common?  Is this a sign the injector is going bad and needs replacing?  Basically where should I start and what do I need to do, or is this a give up and see your local mechanic problem?

Any advice or suggestions would be appreciated,
James Goeke
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Engine Diagnostics / Re: does not start my cat 3126b
« Last post by David.e.atherton on February 12, 2018, 04:52:35 PM »
Hi, two things you will need to look at. First of all go to the rear of the engine and on the
rear of head there is what is called a injection return fuel regulator ( comes off rear head
on elbow than turns downward with fuel line connected on back.) Disconnect fuel hose and
put pan to catch any fuel, turn engine over you should have a good stream of fuel without
any air present. Engine may startup than put fuel line back on regulator. Next step you
Need power to your injectors to start engine. Pin 70 on the engine ECM J-1 facing down
on bottom ECM lower left corner red wire. Make sure you have power going to jnjectors.
Ask Dave Dave Atherton Retired Cat mechanic
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