350 chevy overheat help

[bolo789]

hi guys, went fishing sat with my friend boat, 1983 21 foot searay with 350 chevy v 8 on my way back i notice the heat gage was at the higest point. i have to stop at least 4 times to let it cool to get back to the dock at 2 knots. i saw water coming from the flame arrestor why will water coming from there??? also the water pump on the front sound like when you hit bearing real noisy. where can we start?? how will i know if the head gasket got hit?? thanks for any in put . thats my friend boat and i have to get it fix. thanks. <br /><br />bolo

 

[huntenal]

Re: 350 chevy overheat help

Did U try a comprestion test on the cyl, also check the oil for water.

 

[bolo789]

Re: 350 chevy overheat help

i did not get to do any testing as yet all i know is that the engine was runing fine good great ect, before this overheat pop up.

 

[Solittle]

Re: 350 chevy overheat help

Pull plugs & examine - check oil for presence of water (water in oil will turn oil to chocolate milk color) - compression check - - When was the last time the manifolds & risers were tested or replaced? Water pump?? Thermostat?<br /><br />Original motor, manifolds & risers?????<br /><br />If you are lucky this will not be an expensive fix. It may take a fair bit of work. <br /><br />Don't try to run it until you know what is going on with the motor.

 

[TedCT]

Re: 350 chevy overheat help

I have the same engine. Overheating now too. If the manifolds and risers are old, replace them. Change the thermostat, its only 10 bucks. Pump on the motor old? Change it. Have you replaced your raw water impeller in the outdrive this year? No...replace it. I'm at the change the impeller step now. Eliminate all the variables and do it all. Save yourself the headaches.

 

[bolo789]

Re: 350 chevy overheat help

thanks guys all i knows about this boat is that, this is the second season he own this boat, when he got it he only change the oil and plugs and rebuilt the outdrive last year. so maybe a lot of things are to be change. well too bad i was the one driving it when that happen. so i will do whatever it takes to have his boat running. thanks guys. i will post my out come.

 

[bolo789]

Re: 350 chevy overheat help

hi guys i just got back from the boat yard. and this is what i got done so far. start boat, outdrive water pump is good. i took out the thurmostat and run it without. still getting over heat, i notice one risers is pretty hot while the other one is cool to the touch, i took off the one that is running hot and i notice water in one exaust hole on the engine block, the other three is dry. the riser and manifold dosent look too great so i am going to change them. my questions is what could cause the water to settle in one exaust hole??? als how must i treck to see if the circlucating pump is pumping ?? <br />thanks guys for any info <br /><br />bolo

 

[akriverrat]

Re: 350 chevy overheat help

riser/manifold gasket or rusted through/cracked. or head itself leaking. gasket blown, cracked, rusted through. do you still have banging noise?

 

[bolo789]

Re: 350 chevy overheat help

there is no banging noise, the mechanic said it got to be the impeller in the drive. he will give it a test in the morning so i will post my out come thanks.<br /><br />bolo

 

[bolo789]

Re: 350 chevy overheat help

problem solve, it was a crack riser thanks to every one who put in there two cents. and god bless this site.<br /><br />bolo