yet again here we go
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yet again here we go

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    Default yet again here we go

    hey there guys needin some more knowledge. blew a rear main down in needles this weekend and also i have water comin in through the drive shaft to the pump. i think its the packing but i was wondering if there was anything else i should do other rhan just putting new packing in?

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by rallison View Post
    hey there guys needin some more knowledge. blew a rear main down in needles this weekend and also i have water comin in through the drive shaft to the pump. i think its the packing but i was wondering if there was anything else i should do other rhan just putting new packing in?
    They may be related..

    You said you blew a rear main....Rear main what? seal or bearing?

    If there was not enough clearance between the shaft of the pump and the driveline, the chances of tearing up the thrust of the rear main on the engine are excellent, this could also cause excessive heat on the packing seal making it harden and leak.

    Just an outside thought because I've seen it before.

    GT
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    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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    we blew the seal. not real sure when the packing started to leak but we just rebuilt the motor and ran it twice and notice a bunch of milky crap in the bottom of the hull. checked oil and it was low, got back to camp and confirmed we were losing oil and ruined the whole trip. haha. should i just replace the packing or maybe rebuild the jet?

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Tighten the packing.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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    Senior Member wolfie's Avatar
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    The first thing I would do is to call Tom at JBP. He'll lead you in the right direction.

    just to throw this out as I'm not a jet guru, but if the thrust bearing starts to go, couldn't it take the rear main with it as well? I know when mine let loose the packing was leaking really bad too.

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by rallison View Post
    we blew the seal. not real sure when the packing started to leak but we just rebuilt the motor and ran it twice and notice a bunch of milky crap in the bottom of the hull. checked oil and it was low, got back to camp and confirmed we were losing oil and ruined the whole trip. haha. should i just replace the packing or maybe rebuild the jet?
    Well, I am going to jump in with both feet...................

    First and foremost, you need to double check the driveline alignment.

    If the alignment is off it will do what you describe, the vibration will tear up both the rear main and the packing, not to mention the thrust bearing, grease seals and U-joints.

    The driveline alignment should be too close to be able to tell if it is off by the naked eye, if it looks off by eye it is way out......And needs to be addressed ASAP.

    I only bring it up because you have two symptoms with a single possible cause.

    The packing seal has a retainer with two 3/8" bolts with nuts, have you tried giving it a turn on each side? That seal is supposed to drip (some say one drip every five minutes) I just look for a drip...period, I think mine drips a drop every couple minutes...It may not leak while running because some setups have negative pressure at the suction piece.

    Do not overtighten this packing so there is no drips, the seal is water lubricated and needs this water to prove the amount is adequate...

    GT
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    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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    ok that is awsome info but what if it is leaking enen sitting anchored off?

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by rallison View Post
    ok that is awsome info but what if it is leaking enen sitting anchored off?
    You fail to mention how much water we're talking here.

    Is it a stream, or just dripping?

    A stream would indicate an old hardened or burnt up packing, just dripping, if it had not been tightened for a while, could be just an adjustment...

    I don't know anything about you're ride or how long it sat idle (not idleing).

    If it sat more than a few years, it may be time for a new packing set, I would pull it apart completely if you don't know it's overall condition and simply go through it (or have this done), otherwise changing the packing is no fun while the pump is installed in the boat. (possible, but no fun).

    GT
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    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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    i am sorry, it is shootin out two streams on each side of the shaft. but i gotta pull the motor so i will pull it apart as well. thanks a lot for the info

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by rallison View Post
    i am sorry, it is shootin out two streams on each side of the shaft. but i gotta pull the motor so i will pull it apart as well. thanks a lot for the info

    Keep us posted, that sounds bad to me....

    GT
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    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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    i will probably pull it this weekend. like i said the info is a huge help, this is my first boat and you guys are a huge help.

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    Quote Originally Posted by wolfie View Post
    The first thing I would do is to call Tom at JBP. He'll lead you in the right direction.

    just to throw this out as I'm not a jet guru, but if the thrust bearing starts to go, couldn't it take the rear main with it as well? I know when mine let loose the packing was leaking really bad too.
    If i was on a big block chev. for sure...i worked at a chevroet tech at a dealership until 95..motor homes were blowing rear mains a fast as we could replace crankshaft....some kind of problem with the torque converter expanding from the heat generated by running a big block half throttle all the time..the converter would jam the c rank forward in the block, grind the thrust off the crank....sometimes bad enough to let the couterweights to hit the block....first sign of a problem was oil on the starter nose....me and my bud made good money on them, even though it was warranty work....2 guys..replace a crank and torque converter on a class A in 2 8 hr. 8 shifts and each get paid for 26 hrs.

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    Senior Member Fonz69's Avatar
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    If you end up messing with the pump seal throw that stupid rope seal junk in the garbage and get a mechanical seal.

    Its well worth the money in my opinion and after I had one in my last boat I will never run a jetboat without one!

    No more adjusting or leaks just put it in and never look back!

    HTP has them here is a link http://www.hi-techperformance.com/HPParts.HTM

    about half way down the page "Mechanical Shaft Seal"

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    tom morrow at jet pump repair told me yesterday that he has a new shaft seal that has 4 seals in it and is made from aluminum instead of some of the plastic ones i have seen. stated it was working better than the original bowers design. might want to check it out.

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