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  1. Medium and Heavy Duty
    I just bought an 89 Pete, engine has been swapped to a 3406b 8TC***** engine. Drove home had 60psi for a couple hundred miles. Sat a couple weeks then took off to go load got down to shipper and idle psi was about 18psi. Brought it home did rods and mains with a new oil pump and new o-rings on...
  2. Introductions
    Looking to share ideas and get ideas of cat engines 3406b and 3406e and have multiple of both engines. Looking for problems that no one ever addresses in a forum. Hopefully I can exchange ideas and in return get answers for the hateful problems I have.
  3. Medium and Heavy Duty
    Truck was running fine when parked yesterday this morning checked the oil and it was gray and milky so I drained the oil pan and coolant. There was no oil in coolant just coolant in oil so before I pull the pan I fill back up with coolant an it's coming out of oil pan as fast as I'm putting it...
  4. Medium and Heavy Duty
    I have a 3ZJ04723 Cat that is showing hot but does not act as if it is hot. Engine is rebuilt and runs fine but temp rises too fast as it seems. I had a manual gauge put in it and I noticed today that the sending unit was put in the hole in the center of the head by the exhaust manifold. With...
  5. Medium and Heavy Duty
    I could tell the motor was turned up but didnt know that one of the screws had been taken completely out.. Truck has plenty of power and runs good but almost feels like it has so much torque that its gonna break stuff.. Im pretty sure its not a good thing to not have both screws.. its the...
  6. Medium and Heavy Duty
    Cat 3406b reman serial number 7XC03316 (3ZJ original prefix) The Camshaft that i pulled out is a 4W1765 (high lift) which im not sure is the cam that orginally came in the engine I have a 7W3796 camshaft sitting in my shop which is a turbo camshaft which is in all the other 3406b in my other...
  7. Medium and Heavy Duty
    For a while now on occassions it would run sluggish kinda like it was missing and would do it in 9th and 10th gear. so i would change fuel filters, prime it up, bypass water seperator, and it would run good and after a couple months it would do it again. But this time it wouldnt crank back at...
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