Cat 3406b Air Fuel Ratio Diaphragm Replacement

Posted 10262010 1826 1408947 in reply to 1408878 subject.

Cat 3406b air fuel ratio diaphragm replacement. The 165 3812 airfuel ratio control diaphragm is no longer available from caterpillar as a serviceable component of the fuel injection pumps on the above engines and machines. Shop caterpillar 3406bc fuel ratio repair kits at highway and heavy parts. You can check both by taking the cover bolts off and seeing if there is oil in the cover and you can also look at the cover gasket surface and see black soot where the boost gases have leaked. Grab the plunger stem with pliers and break the 716 jam nut loose with box end wrench turn screw all the way in until just leaving enough threads.

This engine is getting plenty of fuel the way it sounds but not enough air. Diaphragm had hole in causing power loss. Take the line and 2 14 bolt cover off the air fuel ratio on the very back and top of the gov. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them.

On a cat what you are talking about is called an airfuel ratio same function as anaroid but a leaky diaphragm will limit fuel delivery which would limit black smoke. One being collapsed fuel lines as initially stated second is two at once the air fuel ratio diaphragm rupturing and the afr cover warping and leaking. Should be 25psi two swens on back with nuts in deep to hold in placeallen wrenth screwsshould be even with eachother. I was recently informed that shes been opened up to run as hot as she can go and im having problems with her blowing the flangehose off the turbo aftercooler and when i get around 30psi on the manifold she starts barking at me and losing power.

Ive worked on gasoline engines most of my life and diesels are an entirely new dimension for me. 3406b 1993 cat injection pump replace new pump install smoking blue and white replaced old pump smoking. Nothing there to be scared of. If anyone knows of a cat specific forum out there lemme know.

I did change the rear housing unit from old t. What rpm are you measuring boost at. If this isnt the right forum for this post please forgive me. Oe quality 2 year parts and labor warranty delivery in 2 days or less to most areas.

Repair or replacement of the airfuel ratio control diaphragm on delphia fuel injection pumps formerly lucasa fuel injection pumps must be carried out by an. I need a picture of the air fuel ratio valve on a 3406 for correct assembly answered by a verified technician we use cookies to give you the best possible experience on our website. Truck was not smoking until i changed the pump. I just bought a 93 peterbilt 379 with a 3406b cat.

3406 b airfuel ratio pump adjustment soot is normal they load up on fuel then not clean burn fuel mileages on them is 5 55 what is boost pressure.