350 CHEVY OVER HEAT

[bolo789]

HI GUYS, FIRST TIME. MY PROBLEM I JUST GOT A 1988 IMPERAL WITH 350 CHEVY FRESH WATER COOL VOLVO PENTA DRIVE.I TOOK IT OUT FOR A DRIVE NOT EVEN 5 MIN IT OVER HEATS AND I SMELL ANTI FREEZE AND THE MOTOR CUTS OUT I HAVE TO WAIT ANTIL IT COOL BEFORE RESTART OVER HEATS AGAIN BARLEY MAKE IT HOME. ANY HELP WILL DO THANKS. BOLO

 

[dick]

Re: 350 CHEVY OVER HEAT

Well start by checking the seawater pump.On a Volvo they are driven right off the crank or via a belt right next to the crank.

 

[SS MAYFLOAT]

Re: 350 CHEVY OVER HEAT

Hi Bolo, **** is probably right on this one. When people sell their boats while on the trailer, they will sometimes start the engine without the water hose hooked to them. When this happens, the rubber impeller in your raw water pump will melt and fall apart in SECONDS. You just getting the boat suggests to me that this is what has possibly occured. Once you get the problem repaired, watch for white/blueish smoke in your exhaust. If it smokes, you may have overheated the piston rings causing them to loose their temper. This will cause low/poor compression. End result----REBUILD---- It is not a good sign when your engine gets so hot, it shuts down. This is where serious damage occurs. Good Luck..

 

[bolo789]

Re: 350 CHEVY OVER HEAT

THANKS GUYS. ONE MORE THING HOW MANY WATER PUMPS DOES THIS BOAT HAVE?? BEEN IT IS FRESH WATER COOL BECAUSE THERE IS THIS BOTTLE THATS HOLD ANTI FREEZE. IS THERE A WATER PUMP IN THE OUTDRIVE ALSO??.THANKS AGAIN.

 

[snapperbait]

Re: 350 CHEVY OVER HEAT

TWO.. One is the sea water or raw water pump driven off the crank or by a belt.. The second is the circulating pump which is the same as a water pump on a car or truck..The circulating pump moves the coolant(antifreeze) through the engine and the heat exchanger(The big bottle looking thing)... The raw water pump moves sea water through the heat exchanger to cool the antifreeze.. Think of the heat exchanger as a radiator and the sea water as the air moving through the radiator.. Same effect.

 

[bolo789]

Re: 350 CHEVY OVER HEAT

hi guys i change the water pumps and turmostat and the motor still over heats with some whitish smoke coming from it, what that meant crack block or head gasket??? how much you think is the cost for a rebuilt head???where is a good place to go for all these stuff.please keep the info rooling guys, thanks and god bless.

 

[BigBabyLou]

Re: 350 CHEVY OVER HEAT

Bolo, have you checked the heat exchanger and hoses for clogs? That should not be overlooked. If you haven't checked that, do it now before rebuilding the engine, the heat exchanger might just be full of seaweed or so, cleaning it NEVER harms.<br /><br />Hope that is your only problem.<br />Lou

 

[bolo789]

Re: 350 CHEVY OVER HEAT

SO WHAT YOU TRYING TO SAY IS THAT THE HEAD MAY NOT BE BAD I HOPE YOU ARE RIGHT, I AM GOING TO GIVE IT A TRY.WHAT UP WITH THE WHITE SMOKE.IT IS NOT A LOT. AH WHAT CAN I SAY,THE MECHANIC SAID ITS THE HEAD. I DO HOPE HE IS NOT TAKEING ME FOR A RIDE. WHEN HE PORE IN THE ANTIFREEZE TO FULL HE KORK THE OPENIONG AND START THE MOTOR IN ABOUT FOUR OR FIVE MINUITES HE OPEN THE KORK AND IT START BOILING OUT IS IT SOPOSE TO START BOILING THAT QUICK??? I MEANT BOILING OVER. KEEP THE INFO COMING GUYS ANY TIPS WILL HELP. THANKS BOLO

 

[BigBabyLou]

Re: 350 CHEVY OVER HEAT

Every closed cooling system is pressurized (water expands with rising temperature) and when he took the cork off, sure it started flowing over. That's ok.<br /><br />As for the heads, it's better to check the whole cooling system before pulling the engine and filling pockets of a mechanic who doesn't want anything but your money. Trust your skills, try to find the cause of overheating yourself and in the worst case, you can always pull the heads anyway.<br /><br />Keep us posted on your progress<br />Lou

 

[bolo789]

Re: 350 CHEVY OVER HEAT

thanks for the good advice guys, did not get to do much today,any way one final thing i notice when the boat is in nutial it rev very good, but as soon as i put it in drive it have no power. even if i put the leiver all the was it have no rev. what yuo think cause that??? hop on guys i hope this is my final question. thanks again.

 

[SS MAYFLOAT]

Re: 350 CHEVY OVER HEAT

Hi Bolo, How hot does your exhaust manifolds get? If they get so hot that you cant't touch them, I would say you have a water circulation problem with your raw water intake. With the Anti-freeze boiling, it is not getting chilled with the raw water. Your raw water pump should be on the end of the crankshaft, or if it is an early model, it will be on a bracket off to the side of crankshaft with a belt driving it. Check to make sure that you have a belt on it and that it does turn. Does water come out with the exhaust when it is running? If not, you DO have a problem with your raw water coming in and going through your heat exchanger. The white smoke could be steam, but with the loss of power tell me that it may be too late. Rings are possibly shot from getting too hot. Get your raw water flowing, change your oil, and hope like heck the motors all right!

 

[bolo789]

Re: 350 CHEVY OVER HEAT

THE MANIFOLD WAS NOT HOT, I COULD HOLD THEM WITH MY BARE HANDS. I THINK THE MOTOR SHOT GUYS. HOW MUCH YOU THINK IT WILL COST TO REBUILD, OR MAYBE I SHOULD GET A NEXT MOTOR,SAY PUT NEW RINGS HEADS AND GASKET, I HOPE THATS ALL. WHAT WOULD YOU DO SAY I AM NOT A WEALTHY GUY. THANKS FOR ALL THE HELP GUYS.

 

[bolo789]

Re: 350 CHEVY OVER HEAT

HELLO GUYS I AM BACK, I THINK I FOUND THE PROBLEM. FIRST THERE IS NO SEAWATER PUMPING IN TO THE BOAT FROM THE OUTDRIVE, MY ??? IS I DONT KNOW THE MODEL NUMBER OF THE OUT DRIVE,DO YOU THINK IT HAAVE A PUMP IN THE DRIVE, OR IT IS JUST THAT HOSE. I AM STUTTERING RIGHT NOW, HELP. LOL, THE BOAT IS A 1988 IMPERIAL W1TH 350 CHEVY MOTOR VOLVO PENTA DRIVE, THERE IS NO SEAWATER COMING TO THE SEAWATER PUMP. CIRCULATING PUMP IS GOOD, SEAWATER PUMP IS GOOD I THINK,THE HEAD IS GOOD THE HEAT EXCHANGE IS GOOD, TURMOSTAT IS GOOD. JUST NO SEAWATER COMING TO THE PUMP.PLEASE HELP GUYS I KNOW WE ARE THIS CLOSE I COULD FEEL IT LOL.

 

[Solittle]

Re: 350 CHEVY OVER HEAT

Bolo - Please do not type with caps (called shouting). Makes it tough to read.

 

[bolo789]

Re: 350 CHEVY OVER HEAT

i apologise to all. for my bad tiping skill. as i said i am not sleeping tonight still checking the site. want to do some work on the boat sat.