Jet Outboard / Overheating

[Snookster]

I have a 99' 150 HP Yamaha OB Jet -- I have a problem that in very shallow water I pick up sand / shells & injest it directly into the water pump unfortunatly directly located over the jet screw. Now I'm pulling my heads down to unpack the sand. --- has any one succesfully re-plumed the water pickup (for cooling the engine) thru the 1/4" pipe tap on the side of the jet? Any other ideas?<br /><br />Dave B.

 

[JB]

Re: Jet Outboard / Overheating

Howdy, Snookster.<br /><br />Welcome to iboats. <br /><br />I will move this to Yamaha Troubles for you. This forum is for non-repair discussions.

 

[Snookster]

Re: Jet Outboard / Overheating

Thanks -- internet communications isn't my strong point<br /><br />Dave

 

[rodbolt]

Re: Jet Outboard / Overheating

nope4<br /> that is a problem with a jet.<br /> at low speeds its a giant hoover. wait till the muffler eats a hole in it <br /> you will go nuts trying to figgure it out

 

[Snookster]

Re: Jet Outboard / Overheating

Oh yeah -- I got the hoover part down pat. Seems the jet can tolrate trash but the genius that set up the water intake for the engine on top of the jet prop will always have a special place in my heart.<br /><br />Muffler?<br /><br />No suggestions on a back flush? or is this a tear down?<br /><br />Opptional water pick up?

 

[rodbolt]

Re: Jet Outboard / Overheating

hello<br /> the steel tube in the nozzle<br /> it rusts<br /> it will also cause a tech that has never seen the problem some gray hairs <br />about the only way i know to unsand it is to remove the heads and covers. usually the exhaust cover can be left alone.<br /> thats why for flood rescue jets suck. I tried to tell our local police/fire rescue but they bought one and its always mudded up or full of milfoil and dead. I tried to talk them into a hovercat for about 1000 more dollars. for what they have spent trying to keep a jet running they could have bought two hover cats

 

[Snookster]

Re: Jet Outboard / Overheating

Thanks for the tip & I'll ck the tube. What sort of undesireable side effects will this rusted out tube generate?<br /><br />Are there temp sensors on both heads?<br /><br />Dave

 

[rodbolt]

Re: Jet Outboard / Overheating

two temp switches. one on each head. <br /> when the muffler lets go it will act like carbs or a stator problem. it will idle well and make no power. the water pressure tries to back up the exhaust and resticts it. if the engine cant breathe it wont turn up. I have seen techs changing powerpack and carbs and all kinds of things<br />then find the 25 dollar tube is bad

 

[Snookster]

Re: Jet Outboard / Overheating

Thanks Mr Rodbolt.<br /><br />Dave B.