detroit diesel 8v92 questions

Discussion in 'Peterbilt Forum' started by flc120, Oct 13, 2015.

  1. flc120

    flc120 Heavy Load Member

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    Jul 11, 2012
    Miami,FL (yeah i know :( )
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    Took line off return, cranked it over and nothing came out even spraying it with ether its still wont pump,in fact its bone dry. Im pretty sure its the pump i pulled it off.
     
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    Not having a primary fuel filter it might just be stopped up some where, make sure all the lines and entire system are open.
    The fuel pump is like a fan in a car water pump. It will cavatate, not pump, with a small amount of air in it.
    The inline electric pump will work to start it but not supply enough fuel for continues operation. Or try removing the fuel return line from the tank. Close the crossover valve if it has one and vent. Apply air to the tank through the return line fitting. When fuel comes out the return line reassemble it and start it. It takes some time just like 2 fast's program, just enough air to hear flow in tank or regulate 2-5 psi.
    You said it would not pump, that's fuel out an open line?, while spraying it with either? Does the engine run on ether? I prefer chainsaw gas in a spray bottle.
     
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  4. no-handle

    no-handle Bobtail Member

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    Feb 26, 2014
    wharton texas
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    ok, here go 1st ck oil will be blackiss black will not wash off that is common if oil is clean,,,run as fast as you can....somebody is hiding something, water temp 160-185 max..shutters, winter front to control temp,,,8v92-430hp 8vsilver 92 435hp. trans rto-12513 433-390 gear my opinion do not mess with rack or govener housing..make #### sure emergincey kill is good,( not stuck).. motor performs best at 1900-2150 good milege there too,,,,,forget all you know bout low rpm ,high torgue motors...rpm is good for 2stroke screemers....o yea water in oil could just be water pump......no biggy. you have a once in life time opertunity to be a true(( trailer trucker) don't be sceard,, go for it. remember to keep it wound up, tight. lugging it is not good. read as much as you can about this motor you will love it.. simple very reliable ....
     
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  5. sdaniel

    sdaniel Road Train Member

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    Pelham N.C.
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    Ran several 6V92 many years back . Roll in mains and rods before 200k ! Other then that fair engines for the day. That said I like the VTT903/675 I built back then!
     
  6. no-handle

    no-handle Bobtail Member

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    Feb 26, 2014
    wharton texas
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    one more thing most of these motors will use oil at 1st because of to much idle time, not enough rpm.drive like your ### on fire oil consumption will slow down......
     
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  7. no-handle

    no-handle Bobtail Member

    11
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    Feb 26, 2014
    wharton texas
    0
    so much for you to learn,,wish I had one just to start-up brings back good memories....I was 19yrs ice water in my veins,, ...35cents a gal fuel.
     
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  8. flc120

    flc120 Heavy Load Member

    916
    122
    Jul 11, 2012
    Miami,FL (yeah i know :( )
    0
    ok well I went back at it again checked feed line and blew thru it with pressure and theres no obstruction. pulled the pump off the engine hooked up feed line to pump and left the side that feeds the heads on the pump open, when I put a electric drill on it top rpm 2600rpms its builds enough rpm to have the diesel come out.

    my question is if the diesel is being sucked thru with a 2600rpm drill what does the pump WHEN INSTALLED ON THE ENGINE SPIN ?500RPMS? I DOUBT IT I would think it spun twice as fast if not quicker due to the change in ratio off the blower.

    could the pump be worn and not able to pull fuel all the way from tank due to being so little rpms? then the wear in the pump is equaled once rpms are raised thus producing more pressure? im still not getting nothing out of the return line. Im about to try and run the engine with the electric drill, but the hoses don't reach for my idea......then I would also need to cover the hole on the blower were pump mounts.


    and yes the small fork looking connector metal thing was mounted between the pump shaft and blower drive.

    I feel as if the engine is CHOKED ths not letting air into the engine? could this be a problem. I still don't know if that t-handle should be pushed to the in postion or pulled out for the engine to run. I know there is no solenoid on the pump like the NTC cummins to turn them off, supposedly everyone is telling me this engine shuts off with this thandle lever thing that's on the dash.......

    anyone know how it should go in or out for engine to run???

    I tried running it off shots of ether with new batterys,jumper cables on my pikup truck for more juice, me pressurizing fuel tank so that pressure can be maintained in line and with one person on starter button holding throttle open, antoher person shooting ether and me pressurinzing the fuel tan with air and still nothing what gives????
     
  9. no-handle

    no-handle Bobtail Member

    11
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    Feb 26, 2014
    wharton texas
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    little things seem to jack with yu head.....that little shaft is your blower drive ant gonna run when its in yu hand.....t handle is your mergincy kill ......ant gonna go pulled ,,,fallow cable hooks to trip thingy on blower spring loaded plyers turn set the trip thing,,,,opens air intake...
     
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  10. no-handle

    no-handle Bobtail Member

    11
    7
    Feb 26, 2014
    wharton texas
    0
    just 1.5% go to ye old book basic 2strokin.....Detroit wont wake-up....no ether .....things you must not do''''''''''yu-tube, search (run away Detroit) no joke!!!!!!!!!!!!
     
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  11. BoxCarKidd

    BoxCarKidd Road Train Member

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    Aug 26, 2014
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    Hope you understood it is best to have solid fuel throughout the system however you get it done. If you put pressure on the tank with everything still connected you may just have an air lock under pressure.
    Does it smoke out the exhaust while cranking and it should run more RPM than you want with either.
    Since the fuel pump is off does the drive turn while the engine is cranking?
    Tee handle: To many variables for me, thought it should have an electric solenoid by this year model, put it in the middle and it should run.
    To my understanding the emergency shut downs, intake flappers, were discontinued when spring loaded arms were introduced on the injector rack and you should not have one.
    There is a blower drive shaft about 10" long fine splined on both ends. If it stripped out turn it around backwards and run another 1 to 200,000 miles. That was 8V71's.
    Fuel pump shaft speed? I do not know, care, or thank it is reliant to your situation. 2fast can probably answer that if he is inclined. I am just saying this for all you old Detroit haters and drag race lovers. The blowers on drag cars originally came from 2 stroke Detroits. 4, 6, 8-71 etc.
     
    flc120 Thanks this.
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