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another newbie needs help!!!!

  1. #1
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    Default another newbie needs help!!!!

    found this site few months back and really enjoying going back through old threads!!!!!.....very educational since this is my first jet.....but have a few questions i was hoping to get some help with,first my boat is a 1979 nordic 23',it has a dominator pump(really hard to read tag)looks like..mb-12-3,serial#17476 econo 8-83...what are the rules with starting the motor out of the water?i have been told not 2 do it at all,put a hose under the boat into the pump?...was told the pump had a fresh rebuild so im worried about messin it up,about 2 b ready 2 break in new motor and wondering do i need 2 take it 2 the lake or not? Second question,the boat has 2 gas tanks on each side,both lines from the tanks run into an on/off valves and then 2 a filter then 2 motor....do i have 2 put the valves back into the system when replumbing,i was wanting 2 run only 1 sending unit,will the pump (mechanical)pull from both tanks or do i need 2 keep them seperate and run 2 sending units with the on/off valves.....any comments are greatly appreciated!!!

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  3. #2
    Senior Member Widetrack's Avatar
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    Dont run it out of the water! On the fuel lines you need to keep the valves and you can run 1 sender always run the tank without the sender first and when you switch the tanks you will know what fuel is left! Sometimes the fuel will not pull from both tanks evenly and one will empty and you suck air from that tank. No worky! WT

    Do you have 4 tanks or just 2? 1 on each side?
    Last edited by Widetrack; 07-29-2010 at 09:22 AM.


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
    WT

    WFL Crew!!!

  4. #3
    Senior Member jet460's Avatar
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    Quote Originally Posted by Widetrack View Post
    Dont run it out of the water!
    X2!

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  6. #4
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    you can run it for a short time(30 seconds )but wire up a hose/ spray nozzle under the boat,sprayin into the jet intake.....no water to the engine=no engine cooling....so 30 seconds...no more..if you cant tune it(set timing)then take it to the water and do it on the trailer or bring another boat for towing.dont try to do it on the cheap cuz it wont last ...ive tried ...do it right the first time

  7. #5
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    Default cam break in

    why are you guys telling him not to run it? just dont spin the pump... for break in I would hook a hose up to it, just unhook your driveline and I dont see any problem, just start the motor up first then lightly turn the hose on and make sure you dont put to much pressure in the motor with the hose, but that shouldn't be a problem, your pump probably makes more pressure than the hose.

  8. #6
    Senior Member Uminchu's Avatar
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    Quote Originally Posted by Adam View Post
    why are you guys telling him not to run it? just dont spin the pump... for break in I would hook a hose up to it, just unhook your driveline and I dont see any problem, just start the motor up first then lightly turn the hose on and make sure you dont put to much pressure in the motor with the hose, but that shouldn't be a problem, your pump probably makes more pressure than the hose.
    Man, I keep seeing "just disconnect the pump." For some of us- me for sure- that is a very long and frustrating job getting those four bolts out.

    Obviously we need to cool the motor. But if the impellor has a .030 clearance on the wear ring, how does running it dry hurt it? Just wondering. I don't run mine on the trailer because everyone says not to, but...?

  9. #7
    Senior Member Widetrack's Avatar
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    Quote Originally Posted by Uminchu View Post
    Man, I keep seeing "just disconnect the pump." For some of us- me for sure- that is a very long and frustrating job getting those four bolts out.

    Obviously we need to cool the motor. But if the impellor has a .030 clearance on the wear ring, how does running it dry hurt it? Just wondering. I don't run mine on the trailer because everyone says not to, but...?
    I am with you on the disconnect!!! Some have a 3 point mount and can't disconnect! And yes 30 seconds run time is not to bad. But break in is not an option!
    The .030 clearance is a lot but the water suronding the impellor does help support the shaft in the bowl! That helps the bushings,shaft and wear ring! And if you set your pump up TIGHT it is a NO NO! IMO!


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
    WT

    WFL Crew!!!

  10. #8
    Senior Member Uminchu's Avatar
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    Quote Originally Posted by Widetrack View Post
    I am with you on the disconnect!!! Some have a 3 point mount and can't disconnect! And yes 30 seconds run time is not to bad. But break in is not an option!
    The .030 clearance is a lot but the water suronding the impellor does help support the shaft in the bowl! That helps the bushings,shaft and wear ring! And if you set your pump up TIGHT it is a NO NO! IMO!
    Thanks. Supporting the bearings with the water pressurized between the imp and the wear ring makes sense.

    I came close to buying a disconnect for just this purpose. But the cost of that, plus moving my motor forward made it seem not worth the expense and hassle.

  11. #9
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    Default thanks guys

    right on,greatly appreciated,mine is a 3 point mount so it would b a pain 2 unbolt.....luckily i live about 5 miles from lake ray hubbard so ill just run 2 the lake for break n....on the gas tanks only 2 tanks,sorry kinda read funny,but great idea on runnin the other tank first,and keepin the valves,gotcha....thanks guys im sure i'll b needin a little more help....hate 2 say it but fixin 2 run the water lines!!!!...i know this has been beat 2 death so i will reread the posts,but the hole thermostat,no thermostat,multiple dumbs,bypass is a little confussing when u read about it......the boat came with none of that....came with...from pump 2 t,into back of logs,out front of logs,into water pump passages,out thrmostat housing(no thermostat) 2 hoses,2 the snails and out the back!.....hope this doesnt open a can of worms!!!!!!!

  12. #10
    Senior Member 78Eliminator's Avatar
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    post a pick of your set up and it will make it easier for people to give you directions. Also there was a thread a while back with pictures on how the cooling line are hooked up. Welcome to the jet boat world.

  13. #11
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    Default thanks

    i will defenitely post some pics as soon as it starts coming together,my motor should b here end of next week,headers back monday,have 2 finish fiberglassing floor and transom and tons of polishing!!!!!.....this aluminum is killin me!!!!....will say it looks pretty good if i say so myself!...for a 1979,original paint,few ruff spots but i can live with it for now!

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