Overheating

[Dade22]

I am having all kinds of overheating issues with my boat, and i just replaced the water pump. It is a 2003 Tige with a 350 mercruiser. I can idle around and just cruise fine but when i plane it out or pull anyone it almost instantly overheats. I let it idle and it cools right back down. It doesnt always overheat but it's frustrating to deal with cause i never know when it is gonna happen. Any ideas or suggestions? Thanks in advance.

[bigdaddy_houseboater]

Several issues can be present for this:
1. Impeller rubber parts in the water system blockingg ports.
(pull hoses and backflush the system)
2. Stuck thermostat.
(replace the thermostat)
3. Plugged transmission cooler.
Pull the hoses and backflush to the street from the top)
4. Impeller blades flipped backwards, depending on the model pump.
(re-install the impeller)
5. Blown head gasket.
(check for water in the oil)
6. Sand or debris build up in engine block.
(backflush the block)

Lots of different things cause overheating. Id say your fist move is the tranny cooler. If your last pump tore apart, the blades may be in the hose or in the water inlet on the intake manifold. Dont be afraid to start taking that cooling system apart. Boats get more crap in there water system.

[Dade22]

Checked thermostat it is opening also backflushed water system didn't notice anything coming out.

[bigdaddy_houseboater]

Checked thermostat it is opening also backflushed water system didn't notice anything coming out.

Did you take the hose off of the inlet side of the tranny cooler yet?

[Dade22]

Not yet. Gonna try that now.

[bigdaddy_houseboater]

Keep posting. I will walk you thru as much as I can. Ive had these issues as well.

[Dade22]

Had a little trash come out. Gonna run it this evening and see if that helps. I will keep you posted. Thanks for your help.

[bigdaddy_houseboater]

It doesnt take a lot to block it, maybe a handful. Let me know how it goes.

[DavisStrauss]

Make sure that thermostat showing exact results. It will help improve problem.

Hardwood Flooring

[tollie]

how do you back flush? I have the same problem and i had impeller thermostat and waterpump all replaced and it still overheats?!

[TeamAllen]

how do you back flush? I have the same problem and i had impeller thermostat and waterpump all replaced and it still overheats?!

Welcome to the site.
Maybe this previous thread will help?
http://www.tigeowners.com/forum/show...ight=backflush

[4bw]

Until I added a sea strainer, I would get one stalk of hydrilla stuck in that trans cooler and the transmission would overheat. Be careful clearing as the water can be hot when you have been running. Sea strainer resolved this problem permanently. Also, remember you are supposed to change the trans fluid if it overheats, it should be pink/red and pleasant smelling, if is brownish or has a burned odor change it, it is only a few bucks for the fluid.

[Tanner]

Check your exhaust system while on the hose. Make sure you have water coming out of both exhausts. If not, then Pull the hoses going into the bottom of the manifolds. Make sure you have water going into them. If you don't have water then you can backtrack from there, to your pump, etc. If you do have water, then you need to start looking at your manifolds and heads. More than likely it'd be a manifold.