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I have a 2001 cat 3126 ser no. 8yl74019 Starts fine runs
I have a 2001 cat 3126 ser no. 8yl74019 Starts fine runs great until up to Temperature,then will stall in will not restart without ether Then when it does start You have to use You have to keep foot o… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
Looking at purchasing a 2000 Freightliner FL60 sport chassis
Looking at purchasing a 2000 Freightliner FL60 sport chassis crew cab with the 300/850 CAT 3126 and Alison set up to pull an RV 5th wheel. Its spent its life as a AAA sprint race car hauler and has 20… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
Marine 3126B and when running at 2500+ For 5-10 minutes it
Marine 3126B and when running at 2500+ For 5-10 minutes it blows the gasket on the secondary fuel filter. No issues at a lower rpm. Could it be just a bad filter?… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
I have a 2001 3126 cat with the following ecu error. 15 39
I have a 2001 3126 cat with the following ecu error. 15 39 The engine starts easily and runs great until the ck engine light illuminates then loss of power and mileage occurs until key is turned off. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
I have a 2001 cat 3126 in a fl70 box truck with 276,000
i have a 2001 cat 3126 in a fl70 box truck with 276,000 miles the flash codes are 39 15 49 12 61 69. It starts up then the engine protect light comes on and shuts the motor down. I cleaned all connect… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
Second opinion] My fl60 with allison auto will not go into
Second opinion] My fl60 with allison auto will not go into gear the indicatorlight at the top shows a star… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,892 satisfied customers
I HAVE ELECTRONIC 3126 CAT ENGINES- I TURN ON THE IGNITION
I HAVE ELECTRONIC 3126 CAT ENGINES- I TURN ON THE IGNITION SWITCHES AND IT SHOWS PREHEATING ON EACH SCREEN BUT THE PRE HEAT SOLENOIDS ARE NOT PULLING IN ?? ANY HELP ON WHERE THIS SIGNAL COMES FROM TO … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
We have a c8500 with a cat 3126 motor. Engine will turn over
We have a c8500 with a cat 3126 motor. Engine will turn over but will not start. Changed the oil pressure sensor. Did not help … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,803 satisfied customers
I have a 1999 frieghtliner fl70 and it keeps burning up the
i have a 1999 frieghtliner fl70 and it keeps burning up the wire to the sleeper it appears to be positive gound. i put new wires on and made sur everything worked and then drove it about 15 miles with… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,892 satisfied customers
I have 3126b cat some time driving i would get 70 miles and
Hi My Name is ***** ***** have 3126b cat some time driving i would get 70 miles and it would drop to 55 mile this is happening every day new turbo no code … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
I have 2004 Frieghtliner m2 cat engine c7 I replaced the
Hi I have 2004 Frieghtliner m2 cat engine c7 I replaced the engine to 3126 it's running perfect but the speed odemetor and the oil prusure is not working also the temp show high temp show high … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
What 3126 cat engines will swap with a c7acert in a 2007
What 3126 cat engines will swap with a c7acert in a 2007 freightliner M2, 280 hp? I understand the 3126 is more durable.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
I have a 1999 GMCc8500 with cat 3126 speedo and tach are not
I have a 1999 GMCc8500 with cat 3126 speedo and tach are not working. Looking for wiring diagrams and possible causes… read more
Jr Gilliam
Jr Gilliam
Diesel Technology
1 satisfied customers
2002 Freightliner FL60 bucket truck with a Cat 3126 engine.
2002 Freightliner FL60 bucket truck with a Cat 3126 engine. Engine light comes on while driving, then engine shuts off. Sometimes it will run until I come to a stop and then shuts off (almost like sto… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
I want to replace the heui pump on my cat 3126 engine and i
I want to replace the heui pump on my cat 3126 engine and i was wondering if it was possible to obtain a diy guide for replacing it. Thanks Much...… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
i have a 2003 fl80 with a 3126 cat motor serial no. ckm 55015
i have a 2003 fl80 with a 3126 cat motor serial no. ckm 55015 motor droped a valve going to replace found a 2000 gmc with a 3126 cat serial no. 8yl83373 mine is a 250 hp 3126e the other a 3126b it is … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
Hi Cat Man, I am a used Cat Engine dealer, I get about 100
Hi Cat Man, I am a used Cat Engine dealer, I get about 100 calls a week for used Cat and other Diesel engines. Problem I find is that some of the calls are for Machine Engines and I mostly stock Truck… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
I have a cat 3126 in a 2001 fl70 farm truck. came in with a
I have a cat 3126 in a 2001 fl70 farm truck. came in with a load last night, no power. Fuel filters have 200 miles, but that's what it acts like. Flash code 39 Harlan… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,548 satisfied customers
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Daniel Wilson

Daniel Wilson

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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