DD engine starting problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by stark21, Nov 13, 2010.

  1. stark21

    stark21 Light Load Member

    128
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    Jul 25, 2010
    Virginia Beach
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    I have the series 60 12.7 on 01 Western star these past two days temps got colder not extreme cold or anyting like high 20's but truck wouldn't start would turn over with no problem, then spayed ether into the air intake and started up, once it started I had no problem starting it up after shutting it off.. could it be the check valve that is starting to go or just cold weather blues.
     
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  3. 112racing

    112racing Road Train Member

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    Nov 30, 2008
    pocono's, pa
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    probably a bad check valve allowing the fuel pressure to drop overnight
     
  4. stark21

    stark21 Light Load Member

    128
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    Jul 25, 2010
    Virginia Beach
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    ok, so it's nothing too serious since once its running I have no problems. what do they normaly cost and is it something I can do myself or only a shop can do that.. can I manually pump to get fuel pressure or is ether the only way till the valve is checked and replaced if needed.
     
  5. 112racing

    112racing Road Train Member

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    pocono's, pa
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    if you just changed filers check them first gasket might not be seated after that if the lines and all are good go to the check valve

    same exact problem found on a friend of mine's 2000 ws with series 60 ( i called him for answer)

    the check valve should be at the back of the cylinder head on the line that returns fuel back to the tank ...take it out and you should be able to disassemble it ...... there is an o ring in there and it's probably cracked ......clean it out and get a new quality o ring from auto parts store like napa (not out of a horror freight kit) reassemble , put it back in should be good to go

    make sure you take it off the truck to disassemble on the bench so you don't loose the ball or spring or you will be screwed
     
  6. canuck in da truck

    canuck in da truck Road Train Member

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    Aug 6, 2010
    western pa
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    those valves in the back of the head can be #### tight sometimes--not sure of the room on star but on a classic short nose--you are kinda one handing to get it out---
    good luck
     
  7. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Jun 14, 2009
    romulus,mi
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    change the srs and the trs sensors.the srs is above the air compressor going into the front cover,trs at bottom of compressor.(srs harder to change than trs)srs is bad,but you should change them in pairs.%95 of time will not throw a code.am very confident this will solve your problem.good luck.
     
  8. JohnP3

    JohnP3 Road Train Member

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    Feb 21, 2010
    Rock Creek B.C. Canada
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    First thing I would do is clean the battery connections, check and clean the grounds. you need 195 RPM cranking speed to fire. I would be very chincy with the either you can really ---- it up.
    second thing is to change the fuel filters and be sure you have fuel preasure, you must have 15 lbs at idle, 20 is better, 35 at 1200, 45 is better, and 60 at 2100, 68 is better.
    Removing the check valve is a decent idea looking for drain back. If the system is not allowing in air the fuel will not drain back anyways.
    If you have access to a scanner, you want to watch cranking speed, and SRS signal. If you have no codes and the cranking speed is above 195 and the SRS does not say yes it is defective. I have changed very very few of them. cleaning the battery conection usually fixes the problem.
    Just a thought!
     
  9. Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    sometimes engine pos. signal is low when starter crancks engine (100-200 RPM), but good at idle speed ore faster.

    but i doupt, it is EPS, engine wont restart! As I understand engine wont starting after truck sit for some hours.

    Unfirtunatly there is no hand pump on Columbia and we used to add them from mercedes truck to prefuel.

    But if I cant locate problem surally I use to do the cheap stuff first, starting with check valves.

    Then I use pressure gauge, there is a fuel pressure port on fuel delivering pump. 0.3 bar when starter crancks engine is enougjht to start up, but new pump pressure is 0.5-1 bar.
     
  10. stark21

    stark21 Light Load Member

    128
    5
    Jul 25, 2010
    Virginia Beach
    0
    ok thanks for all the help, i def don't want to keep using the ether as it's never a good idea, I noticed that if the engine keeps cranking I can hear it starting to catch and starting so I will start with the battery first and the rest after that... I did just have a PM done and new fuel filters were put in so I could check them too.. once the truck starts I have no problem starting it back up just after my 10 hr break it has the starting issue so I hope it's something simple since I just had my radiator replaced and new muffler put on nice 2800 dollar bill
     
  11. Lowbed

    Lowbed Light Load Member

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    Oct 23, 2008
    Edmonton Alberta
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    If it was OK before the service, Either the fuel filter is loose or the rubber seal is not sealing. As for Ethern you can buy some that has oil in it so you don't dry out the cylinder walls.
     
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