need info on thurmostat housing merc 5.7L

[bolo789]

HELLO again guys, my is <br /><br />iam having over heat while at idle if i put it in nutral at 1500 rpm the guage come right back to 150 from 190.<br /><br />i know this is a sighn of outdrive impeller problem, but but???? at the thurmostat housing the two outlet with the checkballs a little piece of both end is broken off so when the balls sits there is a space open. when at about 3500 rpm one riser is so hot i caunt keep my hand on it i switch manifold and risers from one side to the other and the problem did not follow what could cause one side to be so hot ?? would a circluating pump going bad cause this<br /><br />thanks for any info

 

[TilliamWe]

Re: need info on thurmostat housing merc 5.7L

I wouldn't think the circulating pump would cause it, no. You're 100% sure all the hoses were/are in the proper places/sequence? I know on our 1984 260, there were two that were easy to switch. I am not sure what those balls did in those sysytems. And my 1997 5.7 doesn't have them.

 

[Don S]

Re: need info on thurmostat housing merc 5.7L

You didn't replace the manifold and riser on only one side before this happened did you?

 

[bolo789]

Re: need info on thurmostat housing merc 5.7L

thanks guys for the quick info don as i know you saw most of my problem with this project boat.<br /><br />well the risers are new not even 5 month old the manifold is what i got the boat with. they kinda look great but who knows. the stat housing i soaked in asid and there is no restriction in it but the ends with both ball chip off <br /><br />i think ihe hoses route perfect <br /><br />oh guys one thing in the stat housing i use a o ring gasket, put the gasket then the thurmostat sits on top of it is that the right way guys/????