• Welcome to Jetboaters.net!

    We are delighted you have found your way to the best Jet Boaters Forum on the internet! Please consider Signing Up so that you can enjoy all the features and offers on the forum. We have members with boats from all the major manufacturers including Yamaha, Seadoo, Scarab and Chaparral. We don't email you SPAM, and the site is totally non-commercial. So what's to lose? IT IS FREE!

    Membership allows you to ask questions (no matter how mundane), meet up with other jet boaters, see full images (not just thumbnails), browse the member map and qualifies you for members only discounts offered by vendors who run specials for our members only! (It also gets rid of this banner!)

    free hit counter
  • Reminder of the Thrust Vector and Lateral Thruster group buy through JetBoatPilot.....you only have Until AUGUST 31st. to get in on this group buy.
    With a Maximum discount of 35% this is the sale to get in on!
    So if you are looking to improve your steering-either forwards or in reverse.....this sale may be for you!  

    Thank you Will @jetboatpilot for offering this exclusively to JETBOATERS.net members!

    (You can click the X to the right to dismiss this notice)

will running with flush cap off overheat engine?

robertr

Member
Messages
39
Reaction score
9
Points
17
Location
Miami, FL
Boat Make
Yamaha
Year
2003
Boat Model
SR
Boat Length
23
hi guys, took the 2003 sr230 out for the first time yesterday, as soon as I left the ramp, and just on no wake speed heading out the marina, the starboard overheat light started flashing, I really didn't check too good if I was not getting any or just little spurts of water coming out the pisser, came back to dock, no blockage in impeller or intake mesh screen, let it cool , and it did the same thing again, got back home, flushed the engine for 20 mins ,no overheating, but I did notice I had the flush valve cap off, I read some where that this will make the system loose pressure and not let water flow correctly to engine, I'm going to start trouble shooting but want to check first, besides that it didn't sink and no leaks so that was good, lol, I had installed new tstats before we took her out, and cleaned all the pisser lines out with air, they were clogged,

thanks
 

Elliott

Jet Boat Addict
Messages
181
Reaction score
178
Points
92
Location
Savannah GA
Boat Make
Yamaha
Year
2017
Boat Model
FSH Sport
Boat Length
19
The flush port cap has no effect; there is a check valve in the port to prevent back flow. When you flush, pushing the probe/fitting into the port opens the valve; you must rotate the probe to hold the valve open.

It is not uncommon for the cap to vibrate loose or off.
 

robertr

Member
Messages
39
Reaction score
9
Points
17
Location
Miami, FL
Boat Make
Yamaha
Year
2003
Boat Model
SR
Boat Length
23
Thanks Elliott, guess I got some troubleshooting to do, I did get a steady stream out the tstat pissers while on the hose, I’m gonna start at the Y ftg and make sure nothing is clogged in those lines and work my way back
 

tdonoughue

Jetboaters Admiral
Messages
3,314
Reaction score
2,351
Points
292
Location
The Woodlands, TX 77381
Boat Make
Yamaha
Year
2012
Boat Model
AR
Boat Length
24
An IR gun may be your friend. Several here while tracing overheat issues have used it to determine if the issue is a real overheat or just a sensor. By comparing the same spot on the 2 engines, you can figure out if you are really overheating...
 

robertr

Member
Messages
39
Reaction score
9
Points
17
Location
Miami, FL
Boat Make
Yamaha
Year
2003
Boat Model
SR
Boat Length
23
Correct me if I’m wrong but

At the Y ftg , one leg goes from intake screen from impelller duct housing which is where it sucks in sea water
The other leg of the Y goes to the hose flush attachment
These fees the manifold that feeds a couple of things , oil cooler, exhaust etc
So it either gets water from flush hose attachment or intake screen

now if it doesn’t overheat thru flush hose but does thru intake screen on the water , then it has to be something in that section of line from screen to Y?
 

tdonoughue

Jetboaters Admiral
Messages
3,314
Reaction score
2,351
Points
292
Location
The Woodlands, TX 77381
Boat Make
Yamaha
Year
2012
Boat Model
AR
Boat Length
24
I agree that the line from the impeller duct to the Y should be your first point of inquiry.

However, for many of us, water pressure that we are able to provide by the hose is not as much as normally is provided by the impellers. If you have high pressure on your hose, it may be that you are able to provide more water that way than by the impeller route. Not likely, but possible. In which case you may have some lesser obstruction after the Y which the hose can provide sufficient pressure to get enough water by, but the impeller route cannot. Such may be the case when you have water jackets in the engine that are clogged or something like that.

Hopefully that is not your case. Start back at the impeller duct by pulling the grate... Most likely something is amiss there, I would think.
 

robertr

Member
Messages
39
Reaction score
9
Points
17
Location
Miami, FL
Boat Make
Yamaha
Year
2003
Boat Model
SR
Boat Length
23
I think I found the problem!

I went a little crazy with the silicone and it closed up the intake hole on the impeller housing

what do you guys think?
Put her back and go!
Thanks
 

Attachments

robertr

Member
Messages
39
Reaction score
9
Points
17
Location
Miami, FL
Boat Make
Yamaha
Year
2003
Boat Model
SR
Boat Length
23
Which makes sense why it overheated just in idle , no water coming in, probably would of cleared if I had floored it but may have gotten stuck somewhere else
 

tdonoughue

Jetboaters Admiral
Messages
3,314
Reaction score
2,351
Points
292
Location
The Woodlands, TX 77381
Boat Make
Yamaha
Year
2012
Boat Model
AR
Boat Length
24
That could definitely be it. Hopefully no other bits broke off and went upstream. Clean that puppy up and give us a report that it is all fixed and on the water!
 
Top