Why did my cat 3126 not start up?

The next 3126 did not have the steel oil line to the injector.And also check the return fuel fitting in the rear of the head for metal in it.I have seen metal in them when the engine ran out of fuel and I guess if it was restricted it would not bleed the fuel system. Click to expand…

How to change injectors on a cat 3126?

Here is the procedure. 1. Turn the ignition key to the ON position/engine off. 2. Turn the cruise control ON/OFF switch to the OFF position. 3. Move the SET/RESUME switch to either position. Hold that position until the yellow lamp begins to flash.

What does Flash code 55 mean on Cat 3126?

Flash Code 55 indicates that No Detected Faults have occurred since the ignition keyswitch has been turned to the ON position. Thanks for the information. Some of the codes will not cause your engine not to run and some will. Codes 29, 28, and 31 will not cause a 3126B engine to run.

What causes a 3126B engine not to run?

Codes 29, 28, and 31 will not cause a 3126B engine to run. Codes 34, 15, 18, and 39 will cause your 3126B engine NOT to run. The most common cause of the 3126B engine not to run due to codes 18 and 39 is the IAPCV. Or Injection Actuation Pressure Control Valve. This valve is located on the HEUI pump.

What kind of engine does a cat 3126 have?

I have a 3126 in a 2004 Ford that was running fine when I parked it. Tried to start it after is sat for a couple of weeks. The engine cranks like it should but makes no signs of starting.

How to count the flashes on Cat 3126?

Count the flashes, they will be two digit numbers, eg. 6 flashes then a pause then 3 flashes would be code 63. there may be several codes, it will flash them all one after another. You usually need to go through this process several times to make sure your getting the codes correct.

Is there any warranty on Cat 3126 cranks?

The diagrams I have seen don’t look exactly like my configuration. No warranty! Any thoughts?

I have a 3126 in a 2004 Ford that was running fine when I parked it. Tried to start it after is sat for a couple of weeks. The engine cranks like it should but makes no signs of starting.

Can a Caterpillar 3126 engine have an oil leak?

It’s important to keep the valves adjusted in them, and the 3126E’s tend to have oil leaks in the cylinder head from time to time (coming from the high pressure system that operates the injectors) but it’s usually a very easy fix (O-rings or the pressure sensor). Caterpillar parts are a little expensive! these trucks all have autos behind them too.

What kind of injection does a cat 3126 use?

It is an awesome running truck, he changes his own fluids and has never had any down time with it. The 3126 is a slightly larger version of the 3116 (6.6L vs. 7.2L). All the 3116’s that I have ever seen had mechanical injection, most of the 3126’s are the E model, which use HEUI injection.

The diagrams I have seen don’t look exactly like my configuration. No warranty! Any thoughts?

What kind of cat won’t start a motor home?

I have a 1999 Cat 3126B in my motor home which was running great until we got home from a long trip. After about 2 weeks of being idle, it would turn over but did not fire.

Why does my truck engine not start when I replace the ECM?

NOTE: A new ECM comes with an unprogrammed Personality Module in it. If the ECM has been replaced, the ECM WILL NOT COMMUNICATE and the ENGINE WILL NOT START until the integral Personality Module has had software flashed into it. 4.

Where is the manual stop button on a cat 3126?

The red button on the right side of the cylinder is the manual stop, btw. Here’s how it looks like on the 3116. I guess it’s neither much different nor far from that placement also in the 3126, but I can’t be positive about that.

Why does my cat school bus not start?

Still haven’t had a scanner on it but the cat dealer thinks the heui pump and all 6 injectors need replacing ($3600.00 parts only). He says the low oil has killed the pump and spread metal cuttings throughout the injectors.

Why does cat 3126 B won’t start?

Really need to check the HEUI oil pressure while cranking, if it has an internal oil leak or a worn HEUI pump it wont get enough oil pressure to fire the injectors when cranking. rpsunrise Thanks this. I ran the codes as Jas suggested and came up with 87 and 34 in that order.

When to use ether in a truck engine?

DO NOT USE ETHER IF THE INLET AIR HEATER IS WORKING, as there is possibility of fire or explosion when the ether contacts the heated surfaces. c. Check fuel grade and quality. If cloud point is too high, waxing may result, plugging the fuel filters and lines. Refer to Truck Performance And Driveability Diagnostic guide.

What to do if your 3126 won’t start?

Not at all too techie! After trying everything I could think of or find elsewhere on the web, disconnecting the IAP allowed the 3126 to start immediately, but run just a little ragged. Reconnecting the IAP afterwards, while running, the engine smoothed out and continued to operate normally.

Where is the IAP on a 3126 engine?

Location: The IAP is located on the front left side of the engine and screws into the head just to the right of the HEUI pump. Has a 10″ wire harness with a triangular 3 pin connector. Google “3126 sensor locations” for some clear pictures if in doubt.

Can a 2006 cat C7 start without a starter?

2006 cat c7 cranks but no start unless u give it either, truck has new ipr and heui pump and sensor, trucks builds 1700 psi on scanner while cranking and shows 180 rpm while cranking and building fuel pressure but will not start Experience: 23 Years Caterpillar Engine experience.

When to replace cam sensor on Cat 3126?

Cat 3126. Discussion in ‘ Trucks ‘ started by John White, May 22, 2014 . Just replace cam sensor on cat 3126. I don’t have a scanner to remove fault code.

Why does my cat engine won’t start?

Cat Engine Won’t Start Troubleshooting. Diesel Engine Crank No Start. – YouTube Cat Engine Won’t Start Troubleshooting. Diesel Engine Crank No Start. If playback doesn’t begin shortly, try restarting your device.

What causes a truck engine to not start?

If the ECM has been replaced, the ECM WILL NOT COMMUNICATE and the ENGINE WILL NOT START until the integral Personality Module has had software flashed into it. 4. No Speed/Timing Signal: a.

What kind of oil does a cat 3126 take?

By the way my engine in Serial# HEP 280486. I tapped into the high pressure oil galley and put a 4000 psi gage in. Had a helper crank the engine while I watched. The pressure started up kind of slow and then quickly headed toward max on the gage.

What kind of oil does a cat pump take?

Cat uses a IAP sensor (injection activation pressure) to monitor the high pressure oil that opens the injectors. The HEUI pump takes engine oil at 60-65 psi and amplifies it to 1,200 psi at starting to 4,000 psi relative to the engine demand/load.

Why does my school bus engine not start?

The engine has never used any oil before and has about 5000 miles since last oil change. I filled to full (about 2.5 gal) still no start. Fuel tank is nearly full. Both filters have fuel in them.