Can't get my CAT started

Discussion in 'Trucks [ Eighteen Wheelers ]' started by zx150, Jun 19, 2012.

  1. zx150

    zx150 Medium Load Member

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    Sorry to keep flooding the board with new threads, I figure it might be less confusing to start up a new thread rather than drag the other old ones out to eternity.

    I'm trying to get a mechanical 4CK Cat 3406B diesel started for the first time after an in-frame rebuild and am having trouble. The engine will crank but it won't fire, we did shoot some ether into the intake and the engine runs but stalls out after a second or two. Before the engine went back together the timing was properly set on the gear train and when the fuel pump rack went on the timing was set(timing pin installed in fuel pump, engine set and locked at #1TDC) so to the best of my knowledge the timing is correct.

    When it all went back together the fuel filters were filled with diesel and installed then the system was primed using the primer pump until there was so much resistance on the pump handle that it couldn't move anymore. The thing I don't get is that after the engine is cranked over there is no pressure loss at the primer handle. In the past every time I've needed to use the primer pump there's an immediate pressure loss after the engine is cranked and you're able to pump on the primer a few more times, that's not happening now.

    Thinking there was air in the lines I cracked the fuel lines one by one at the cylinder head and had somebody else crank the motor. When the motor is cranked fuel spurts out of the line at a high pressure when the pump 'fires' the injector, so it doesn't look like there's any air atleast between the pump and where the fuel lines enter the cylinder head. Then again the fuel is only spurting out for a split second as the pump 'fires' the injector.

    Any ideas on what the problem might be? I don't really know too much about diesels but everything I've seen and tried is leading me to think it's a fuel issue. The engine cranks over no problem but doesn't show the slightest hint of sputtering or firing on diesel fuel. Don't know if it matters or not but as the engine cranks the turbine for the turbo spins and there is a little bit of smoke wafting out of the stacks on the truck. So, maybe it's firing a little bit? The injectors are 'new' remanned units

    Thanks for the help! I'm completely out of ideas.
     
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  3. Les2

    Les2 Road Train Member

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    Pump it up, then while someone is turning it over keep pumping and you will force the nozzles to pop off. Also have the go pedal to the floor until it starts to catch.

    Remember this, cause if you ever run out of fuel, this is what you will have to do.
     
  4. zx150

    zx150 Medium Load Member

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    Will give that a try first thing in the morning, thank you!
     
  5. smokincamels

    smokincamels Bobtail Member

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    nevada and arizona
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    Ckeck voltage at shut off solenoid.or solenoid it self.in the past just pump and go unless no power to solenoid or bad solenoid
     
  6. Bill104

    Bill104 <b>Pepsiholic</b>

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    Might try petting it gently under its chin, that always gets my cat to purr. LOL sorry just had to. Is your electric control for the pump hot maybe its not letting fuel flow.
     
  7. bender

    bender Road Train Member

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    Don't Kid Yourself
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    I would remove the hand primer pump from the filter head and inspect the check valves in the pump base. The check valves commonly come out of their bores and flip around backwords. This causes an extremely stiff hand pump that can't be pumped due to it holding internal pressure and at the same time blocking fuel flow. All of your fuel is directed through those two little check valves.
     
  8. Jumbo

    Jumbo Road Train Member

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    Try pull starting it.
     
  9. YETI1

    YETI1 Light Load Member

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    kansas
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    Does it have the oil pressure override at the pump? I would recheck the wiring at the pump.....
     
  10. zx150

    zx150 Medium Load Member

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    Mar 30, 2012
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    Double checked all of the wiring and it is hooked up the same way that it was before we tore it down. The voltage at the fuel solenoid is the same as the full battery voltage, 13.8V.

    I pulled the valve covers off and cracked the lines at the injectors then had somebody watch while I cranked the motor over. As the engine cranked over there was fuel spurting out in sequence so there is fuel getting to the injectors. Also had somebody pump on the primer while I cranked with no luck. Haven't torn the primer apart yet to check the check valves, will put that on the to do list.

    Somebody suggested that the timing advance on the fuel pump clutch needed to be preloaded or preset along with the pin timing method, the books don't mention anything about this. Any ideas?

    Thanks again for the help!
     
  11. poppapump1332

    poppapump1332 Road Train Member

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    Are you sure the fuel isn't bad?
     
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