overheating

[locator229]

I recently put a used engine n my 1988 wellcraft 190 classic..engine has 120 psi of commpesion on all 4 cyl..it is a 3 liter mercruiser ..when i run boat hooked to hose it runs smooth for about 15 min the temp goes up fairly quick I am no mechanic just need input on what the problem might be..thanks for any suggestions..thanks

 

[Bondo]

Re: overheating

Ayuh,... Replace the Impeller in the lower unit....
Or start there anyways...

 

[locator229]

Re: overheating

thanks for the suggestion ..but i have already done that anymore thiughts

 

[Bondo]

Re: overheating

Ayuh,.... Then follow the water,.... Water In, Water out....
Pull the In hose from the T-Stat housing,+ test the flow as stated in the manuals....

Manuals are in the Adults Only section,... Stop on by,....

 

[locator229]

Re: overheating

Well here is an update on the 88 wellcraft... I took the thermo housing of ..and of course no thermo..go figure now the question is do you think that a new one will solve the problem ? thanks tony

 

[bomar76]

Re: overheating

No.
Someone took it out in a failed (and foolish) effort to correct an existing overheating problem in that engine.

 

[locator229]

Re: overheating

so that will probolt not fix the problem here is the other thing i noticed the drive belt was loose if i tighten the belt and put thermo back in do you think this might fix the overheating?

 

[Bondo]

Re: overheating

so that will probolt not fix the problem here is the other thing i noticed the drive belt was loose if i tighten the belt and put thermo back in do you think this might fix the overheating?

Ayuh,... So you've found 2 Issues,... Fix those 2,+ Try it...

 

[locator229]

Re: overheating

thank you for the help and suggestions ..I am gonna go take care of these thing and will update you all with the results..once again thanks

 

[liquidlew]

Re: overheating

One more thing to check: Engine Timing!

 

[bomar76]

Re: overheating

so that will probolt not fix the problem here is the other thing i noticed the drive belt was loose if i tighten the belt and put thermo back in do you think this might fix the overheating?

Seriously doubt it.

An old wive's tale, repeated by those with zero knowledge of thermodynamics, is that removing an thermostat will cause an engine to overheat due to "The water racing through the engine so fast it doesn't have time to cool it"

That is utter BS.

If your engine overheats with out a thermostat, it will with one.

 

[achris]

Re: overheating

... "The water racing through the engine so fast it doesn't have time to cool it"

That is utter BS....

So, I'm not the only one to have been told that.

Chris.........

 

[achris]

Re: overheating

One more thing to check: Engine Timing!

One of THE most common causes of overheating is a blocked exhaust elbow... That's the second place I'd be checking (first would be the impeller).

Chris.......

 

[bomar76]

Re: overheating

So, I'm not the only one to have been told that.

Chris.........

I read that on here from time to time and just shake my head in dismay.

It's right up there with putting clothes pins on your fuel line to stop vapor lock..

 

[lakeerieboater26]

Re: overheating

make sure your exterior water intake hose is not kinked !!!

 

[achris]

Re: overheating

I read that on here from time to time and just shake my head in dismay.

It's right up there with putting clothes pins on your fuel line to stop vapor lock..

How about 'using large fuel lines makes the fuel pump work harder'.... Just about wet myself laughing when I read that one.

Chris......

 

[full stringer]

Re: overheating

being stated that it takes 15 min to overheat tells me its not the impeller. it would overheat rapidly if thats the case . check exhaust log pull the hose that connects and start the engine with water supply of course, there should be a steady stream of water after the t-stat opens. if there is, the problem is a blockage in the log and replacement is needed if you have a cracked block or blown head gasket these symptoms could occur as well. a compression check will tell. good luck!!

 

[locator229]

Re: overheating

i had a mechanic do compression test we found 120 psi on all 4 cyl..i put new impeller pump..i will cheeck to make sure water is getting to thermo and let you know the results..