new here and need your advise.150 ficht

[johnson5]

Hi,Boaters just recently purchased a 24'grady offshore with dual 1999 150 ficht.They have had all upgrades w/500 hours on them,They fire right up and run wonderfully....except one motor over 4000rpm will trigger hot light beep and go into <br />safe mode..anything under 4000rpms runs purfect<br />no problems or lights(all day long)...Past original owner said he replaced thermostats,but that could be only here say ,i have noticed on water prssure gauge<br />that this particular motor has 30psi when at 3400rpm.other motor at 15 psi..can you help me?<br />oh i can shut off and refire and start running<br />with no problems...<br /><br />1988 gray white offshore<br />w/armstrong bracket<br />&dual 150's

 

[MCM]

Re: new here and need your advise.150 ficht

Welcome 88offshore, <br /><br />From a purely mechanical point of view, the difference in psi between motors would seem to indicate some sort of obstruction in the water passages, whether its from a t'stat not fully opening or something else is dificult to say.<br /><br />Since the motors are apparently mew to you the prudent thing to do may be to replace the t'stats & water pumps in both motors and have both systems properly flushed.<br /><br />Somebody more familiar with your motors may have other or better advice.

 

[seahorse5]

Re: new here and need your advise.150 ficht

IF the waterpump kit was replaced recently, it sounds like they installed the wrong one. There are 2 kits that look almost identical, but will lose water pressure if the wrong one is installed on motors with a 25" shaft.<br /><br />Your motor (I'm assuming is 25") requires a #5001595 waterpump kit. Perhaps someone installed either an off-brand kit or the incorrect #5001594 kit.<br /><br />IF there are any thru-hull fittings, transducers, or "speed-wheels" within 14" of the prop centerline, or marine growth on the hull, aerated water could be causing the overheat at high speeds. The motor needs a good supply of "solid" water at the gearcase intake screens.

 

[johnson5]

Re: new here and need your advise.150 ficht

thanks for your reply guys!..However i changed the 2 upper t-stats.my mechanic says that theres another one below the housing,where i cant get to.<br />(im in a slip with no trailer),Like up the creek <br />with no paddle..<br />Changing the 2 did not help.I have this high pressure as soon as you fire up the motor<br />it pees really hard,but as soon as you rev it up <br />the gauge will fly to 30 max psi,at idle about 10psi,so with increase in press i dont think its the pump? I guess i need to get it out and change that other lower t-stat?anything besides water to flush this system?would like to take the motors over 4000rpm.....

 

[Solittle]

Re: new here and need your advise.150 ficht

For any motor that is "new to you" I would replace both the t-stats and water pumps even is the seller "said" that they were replaced yesterday especially if you are getting indications of overheating.

 

[andy6374]

Re: new here and need your advise.150 ficht

I'm not at all familiar with these engines. That being said, do these motors have pressure relief valve system like a merc. If this was a merc and the water pressure was building up at higher RPMs I would guess the poppit is stuck and won't open. This would definitely cause the engine to overheat.<br /><br />-andy

 

[jim_in_day]

Re: new here and need your advise.150 ficht

There is a service notice for that problem, there is a specific repair for that problem that your Johnson/Evenrude shop should be aware of. I'm not at the shop right now, so i can't give you a specific number on it. It involves drilling a hole in a specific location in your midhousing

 

[johnson5]

Re: new here and need your advise.150 ficht

Jim_in_day thanks for the Hope! can you find this info so i may talk to a mechanic,would luv to print this service bulletin!!!!!!waitong for your reply....and thanks for a GREAT SIGHT!!!!

 

[johnson5]

Re: new here and need your advise.150 ficht

btt

 

[MCM]

Re: new here and need your advise.150 ficht

88, someone posted the info from this bulletin about 2 weeks or so ago on another thread, you might be able to find using the search feature