sport jet 90- maybe i shouldnt be a boater!!

[Eric45653]

I took my family out today in my Bayliner Jazz today. I got stuck on a sand bar (didnt see it or know it was there). After freeing myself, i continued on back to open water and the moter died. I think it overheated (strange?). I was able to restart after much effort (and lots of start fluid) seems to run fine, and then quit again. I radioed someone to tow me in, started the boat again and trailered. After out of the water i inspected the grate, and it was not obstructed. Question-What happened, and how do i fix????? Thx

 

[Jeff Walkowiak]

Re: sport jet 90- maybe i shouldnt be a boater!!

you most likely sucked sand in the cooling system.

 

[rodbolt]

Re: sport jet 90- maybe i shouldnt be a boater!!

only 3 types of boaters, those that have run aground,those that will, and those that lie about it.<br />next step is a compression test, after that I would pull the head and check it for warpage.<br /> they are noted for warping heads. would be a good time to inspect the cyl walls and clean the sand from the block.<br />if it all looks good reassemble as per the service manual and keep boating. post in the force or mercury section as its a 3cyl force motor.<br /> I was a sugar sand(mirage) dealer for sometime and still have the drive manuals up to 95.

 

[Eric45653]

Re: sport jet 90- maybe i shouldnt be a boater!!

ok-i yanked the exhaust manifold, and the head. Also, droped the ride plate. Dosent seem to be enough sand to cause an overheat????? Is there a water pump on these things, and were is the water intake, and out flow? After i clean it, and put all back together, i would like to know if it is circulating. thanks

 

[rodbolt]

Re: sport jet 90- maybe i shouldnt be a boater!!

the cooling water on that rig comes from the jet.

 

[Eric45653]

Re: sport jet 90- maybe i shouldnt be a boater!!

thanks rodbolt for your responces- thermostate is really bad (filled with river gunk). i may leave it out because its only 130 deg. What do you think? ive been checking back every couple hours to see if anything new has posted. thks

 

[rodbolt]

Re: sport jet 90- maybe i shouldnt be a boater!!

clean all the passages and reassemble it as desighned. works first time every time.

 

[ziggy]

Re: sport jet 90- maybe i shouldnt be a boater!!

R&R the t-stat if it's gunky. at the very least test it in a pan. w/ a thermometer. i'd think it's sand to in the intake. sounds like rodbolt is the man on the sportjets though, he's got the mauals and experice. i'd think not on leavein the t-stat out. bad idea. as for how it cools, rodbolt leads me to believe that it cools like a pwc. out the high pressure side, a resriction occors at the nozzle, forces water into the cooling passage right before the restriction....that'd be a geuss, so take it for what it's worth...rodbolt??? where it exits, i don't know...so a sportjet is a force ay,,,,hum.<br />oh, don't quit boatin just because ya hit something, geez, anyone that's been boatin for a bit will let ya know what 'they' hit,,,or almost hit. lets see, i've hit rocks, sand bars, garbage in the river, can't tell ya how many weeds i've cleaned off a outboard, chucks of wood that get sucked up in a jet. rocks that cause impeller damage,,, i am gonna keep boatin till i'm out of bread.... . at this point, i'd think that servicein a jet is easier service than a i/o.. i got's a lot of issues with my i/o. the drive on a jet is direct. no movin parts. i have appricieation for a jet drive. those jazzes, look fun... hang in there, boatin is dangerous man...

 

[rodbolt]

Re: sport jet 90- maybe i shouldnt be a boater!!

yep thats about how the cooling system work. there is a small hole with an oring in the impeller housing that feeds water to the engine adapter plate.

 

[Eric45653]

Re: sport jet 90- maybe i shouldnt be a boater!!

Thanks all for the info...and more important...the incouragment!!!! I cleaned it all out..and installed a temp gauge. I also have a 34 footer w/ problems, but are being worked out(thanks to this forum). THANKS!!

 

[Capt Ken]

Re: sport jet 90- maybe i shouldnt be a boater!!

Learn something new everyday about my jets. Thought the O ring hole was the drain to keep the water from standing in the block and the big one inch hose coming from the pump the inlet water.

 

[Capt Ken]

Re: sport jet 90- maybe i shouldnt be a boater!!

Just looked it up, check the big hose on the rear and back flush it. That's the inlet hose for the incoming water.