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  1. J

    Cat 3126 air compressor

    Zorry, the valve on the inside of the firewall that the airbrake hoses that go through the firewall attach to. But, the truck doesn't build up enough air (around 10psi) and it sounds like it is leaking internally in the air compressor....its pretty loud and I've soaped everything around it and...
  2. J

    Cat 3126 air compressor

    Yes, the air block is what I was describing.....there is a rubber flap on the bottom (end) air was coming from that but not all of the time. But, air compressor won't build more than 10psi right now and when I shut the truck off I can hear air that sounds like its inside the compressor.
  3. J

    Cat 3126 air compressor

    davekc, thanks for the reply. I'm in south Texas, cold but not freezing. Truck ran fine yesterday.....builds up air pretty fast. I have noticed lately that the truck is leaking off air relatively fast. I heard it leaking one day and it seemed to be coming from the valve on the firewall where the...
  4. J

    Cat 3126 air compressor

    I have a 1998 FL70 with a CAT 3126. The air pressure wont build up over somewhere around 10psi and it sounds like there is air hissing from inside the compressor. I had the old governor in my toolbox and swapped that out and also an old unloader valve kit. I also noticed on oil leak on the front...
  5. J

    Cat 3126

    Yes, the engine fan comes on with the ecm when the temp runs up.....runs about 10-15 seconds then turns off. The fan switch on the dash has been very useful.....I like to turn it on manually when in traffic or when I'm idling....it makes may AC blow colder.
  6. J

    Cat 3126

    My fan is air activated and I have a switch on the dash that I can turn it on and off with (previous owner installed that). When the engine is off I can turn the fan by hand freely with no play as long as there is no air to it.
  7. J

    Cat 3126

    I'm thinking a 4 row radiator might be the cure for the running hot issues. Thoughts?
  8. J

    Cat 3126

    My fuel economy is around 10mpg at 65mph......22.5 lo pros, 3.73 rears, 1 to 1 final ratio.
  9. J

    Cat 3126

    Bruno.....I guess what I was trying to say is that I like the torque/power at lower speeds but when running at highway speeds on small hills it seems to have to work hard and the water temp climbs like no other......my engine fan runs a lot.....
  10. J

    Cat 3126

    I have a 98 3126 and its been ok. To me it runs way too hotfor my liking.....I'm thinking about putting a 4 row radiator in it to see if that helps. Other than that....with decent maintenance its never really given me too many issues. Mine has around 350,000 miles (reman). I do think its...
  11. J

    Air compressor CAT 3126

    I have tried to attach a couple of pictures. It is leaking out of the plate with the 3 bolts on it.
  12. J

    Air compressor CAT 3126

    Just called Freightliner $703.33 for a reman CAT part #3391.......ouch! They said no gasket kit for it.
  13. J

    Air compressor CAT 3126

    I have a 1998 FL 70 with a 3126 in it. It is starting to leak air out of the top plate (?) of the air compressor. There are 3 bolts I believe that secure the plate/cover. Do they make a kit for this or should I replace the compressor?
  14. J

    CAT 3126 rough idles then dies

    I had to be away for a few days (boat races) and will get back to troubleshooting tomorrow (Tuesday). But, I did rig me a pressure gauge by the secondary fuel filter and the reading was 0. I'm going to double check that tomorrow when I have time. I will change out the primary filter and...
  15. J

    CAT 3126 rough idles then dies

    I've replaced both sensors (timing and speed) under the HEUI pump. Cranked it over, ran great, high idled for about 30 minutes. The next morning, cranked it over ran about 30 seconds and died. Acts like it runs out fuel and when I check the secondary filter it is almost empty. By the way...
  16. J

    CAT 3126 rough idles then dies

    I have a 1998 Freightliner FL70 with a 3126 in it. The truck has ran great until recently. This problem has been intermittent......someitmes it starts right up then other times it will take a second (acts like it has air in it) rough idle then die. The only way it will start again is if I take...
  17. J

    best place to buy 3126 filters ?

    Just bought fuel filters (Cat brand) from Freightliner of Austin (Tx) and they were $43.65 delivered to the door. Same filters from NAPA (their Gold version) locally was $60 and I had to go get them. I think my oil filter from Freightliner runs around $13 (Cat brand).
  18. J

    FL70 fuel tanks

    I have thought about steam cleaning the tanks and then maybe treating with some type of rust product. I've read about some those I'm just not sure about them. If I do keep and clean out the current tanks then how often will this have to be done. As opposed to finding some aluminum tanks and...
  19. J

    FL70 fuel tanks

    Bluejaybee.....I've owned the truck for a couple of years and have just about have everything fixed the way I want it. I'm now getting to these fuel tanks. I know I can get the square ones but I was thinking a pair of round ones with similar dimensions would be cheaper and look "sort of" cool...
  20. J

    FL70 fuel tanks

    I have a 1998 FL70 with (2) 100 gallon square steel fuel tanks. Here lately it seems like I'm beginning to see some rust looking particles in the bottom of my water/fuel filter. How hard or would you get a couple of round aluminum fuel tanks the same length and replace them with those. My...
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