Overheating and lack of water
 

Ok, I have 3 days to getthis taken care of :(
Last week at LOTO I noticed several times that I wold not have wter exiting the port motor
Once the heat alarm went off :(
After ebing shut down for say, ten minutes or more I would restart and have plenty of water flow?
I have flushed the hoses twice, once at the car wash with a power sprayer.

What would casue me to loose water vo;ume and pressure once up and running?

Re: Overheating and lack of water
 

2 words,,,,,,,


bravo fever

Re: Overheating and lack of water
 

and just what is that suppose to mean?
:rolleyes:

Re: Overheating and lack of water
 

Have you checked your water impellers recently??? Might have lost some fins and allow flow through the oil cooler at low rpm and at higher speeds, the impeller pieces then might get sucked fast restricting the flow..... just a thought as to something to look at....

If you find inspect impeller and you are missing pieces, take off the hoses to the oil cooler and check the back of the oil cooler first and then flush if you haven't found all the pieces. I've found that you have to dig the pieces out, flushing only moved them to the back of the oil cooler....

Good luck!

Re: Overheating and lack of water
 

since you say you flushed , i assume you mean back flushed , which would remove any debri or old impellar fragments.

bravos some times fall victim to the rubber hose between the transom assembly and the helmut, colapseing, and then freeing them selves after the engine is shut down/ suction removed.

if their was a loose line or some type of air entering the system, it would most likely occur at start up, and over heat pretty rapidly.

good luck

Re: Overheating and lack of water
 

OK I do not want to hijack this thread but i have a question also. I am thinking about coming to the St Croix for the weekend but i noticed interesting Heat problem. I almost have the bugs worked out of this thing.... just in time for gas prices to skyrocket. The third time i put the motor together it really seemed to run well i fixed the oiling problem and put another piston in (that makes 4, and twice apart this year) after the dist went bad again!

It seemed like i could ruin it forever with no heat problem or oil temp problem (thanks fred).... But now i seem to have a heat problem and i am thinking i filled the block 1/2 way up with sand? we park on sand bars and i did suck up a bit of debris once. Now when i run it for say 10 15 min steady at say 3500 to 4500 rpm. the oil temp doesn't really rise that much .... say maybe 230 but the engine water temp will push 220 or more for about 10 min or so idling . I could never get it this hot before!!?!? When i am running there is not a problem. I just don't want to shut down the power when it is that hot. i am also getting allot of steam at these temps... (yes it is boiling in the heads) I did punch out the extra hole in the back of the felpro gaskets in the rear of the head to promote more flow. any ideas? should i pop a freeze plug a try to empty the sand? I am going to pull the motor again this winter and rehone and possibly put in a gap-less top ring???? Should i just wait for end of season?

Re: Overheating and lack of water
 

hpy540....
I'd try to do whatever you can to try and find the culprit. Pull everything in the cooling lines and see what you can blast out. And check your impeller. Missing a few fins will reduce the amount of water being pushed through along with any blockage... I'd pull the drain plugs and hoses and see what comes out, worth the little time it would take with hopes of clearing the system and preventing any serious damage .... I'd forwad and reverse flush all the access points.....

Good luck!

Re: Overheating and lack of water
 

East, impellar looks fine. Well at least once I took the assembly off and rotated the pump and looked at all the vanes. All were there, at least the ends visible to me. I guess it could be possible that the other side might be missing, but highly doubt it. I do fear that maybe the casing might have too many grooves in it. Could be possible and i plan on replacing the casing along with a new impellar this weekend.

Monstaa, now that is something I have not thought of. And I can totally agree with your thought that could be the cause.
How difficult is it to remove the entire intake hose? Looks like a pain :(

Indy, no problem with highjacking :) Same issues I have could help you also :)
If you have not already removed the blue plugs on the sides of your block I would do that first. If yuo get no water draining then I would hook up a garden hose and run the motor while using a coat hanger to push in the hole and free up the blockage.
This is the FIRST thing I check anytime I have low or no water while running.
On that thought, and along with your freeze plug comment,
Monsta or East do you think it is possible that even if I have good flow thru the blck drains that I might still have some blockage farther internally and would removing the freeze plugs help gain access to such blockage?

Re: Overheating and lack of water
 

I would pull the plugs and push water through the system and check to see if both sides of the block have about the same flow out the block drain plug... if one side seems slower than the other, than you might have found the problem.... basically keep pushing water through all the piping and hopefully something will show up, thus revealing your problem... keep us posted.....

Re: Overheating and lack of water
 

back flushing is the most productive at cleanseing engines. kinda like a colonic for your big block.

Re: Overheating and lack of water
 

If you have sand, work from the T-stat housing back, throught the oil cooler, the fuel cooler. Sand will make it through the pump, but it doesn't do well, at least in my boat, past the fuel cooler.

And Have I mentioned that i would like to choke the %$it out of the rotten *&ck sucker that designed that low water pick-up

Re: Overheating and lack of water
 

OK, was talking with someone this weekend about this.
He stated there is a plastic peice at the connection of the raw water hose on the inside of the transom mount.
Says there is a special tool to remove and install this.
Anyone know? what part #? I have looked on Bam's site and not totally sure what it is.

Re: Overheating and lack of water
 

Out of curiosity, why are you trying to remove this piece??? What led you to this point??? Determine problem is in the drive plumbing??

Re: Overheating and lack of water
 

The lead on this was by someone else's suggestion only.

I did a complete inspection of all the hoses, except the one in the transom assembly :( thats the last resort.

All hoses are fine, raw water pump and impellar are fine.
I removed teh thermostate and it looked fine, was new this season.
After removing the hose at the transom assembly I power flushed the hole back to the drive, was able to get a few small pebbles and some sand out :(
Put everything back together and will do a water test tomorrow, weather permitting. This test will be without the thermostat. If that goes well, I will install a new thermostat and try again. If it does not go well, the last resort of pulling the drive and checking the inner hose and insert will needed to be done. That will take away from my weekend run :(

Re: Overheating and lack of water
 

I thought you were trying to remove that piece... Were you getting good water flow at the bottom of the outdrive when you were pumping water from impeller point back down into the drive??? I have a hose hookup for freshwater flushing the engine and before starting the motor, the hose water will backflush down the outdrive basically gushing out the bottom holes of the outdrive.... You really must have sucked a lot of something into the drive at some point... were you in any shallow areas, hit bottom, get stuck at any point with the boat??? If you were getting a strong flow at the bottom of the drive, going by your extensive flushing, I'd say you'd have to have it licked at this point.... have you ever removed a drive???

Re: Overheating and lack of water
 

Iwas 'thinking' of removing that peice :(
I was getting good flow once the friend helping me stated there is no more rocks or sand coming out :)
I will be putting in a hose adapter and T block tomorrow :)
I have been wanting to do it for along time. Right now I have the hatch off and now is great time to do some maintenance on it tomorrow. Grease the coupler, steeting etc.
I will know tomorrow after a water test at the lake if all came clean.
I have personally never taken a drive off the boat. Done many Jet drives in the years past, but never an out drive.
Yes, I was in a shallow launch and have already done extensive and complete flushing on everything else.

Re: Overheating and lack of water
 

Just let us know if you have to pull the drive... it's really easy with two persons. If you have tie bars and/or hydraulic steering, then there is a little more time involved..... and grease the two zerks in the drive shaft universals when your in there

Coupler... two grease fittings per coupler

Good luck! Hope all goes well!!!!

Hey, long delayed update!!!
Boat has been drydocked since this issue!! :(

however what I found out was that the Oil cooler was plugged!!!
Not just with impellar peices, but with small rocks/pebbles and other crap!!!
If anyone ever has a lack of water pressure and they say they backflushed everything, I would still take off the upper and lower hoses for the oil Cooler and have a look!!

Of all the passages on mine only three were clear!!!!!!!!

All is well now :)