Does my outboard need to be rebuilt

[dangerousdan]

The guy who works on my Mercury 175 horsepower says it needs to be rebuilt. It is ten years old but has very few hours and has always been garaged.<br />Can anyone tell me what the compression should be on this V-6?<br />Thanks.<br />

 

[Matt King]

Re: Does my outboard need to be rebuilt

when you check the compretion on the Merc. see if they are all the same. (balanced) within a few lbs. Other than that if it runs good don't worry about it. you can still get good power out of a used outboard. If it won't start, fouls out, or low end and high end power problems you might have to rebuild it. If it's not broke don't fix it.<br />good luck,<br />Matt

 

[dangerousdan]

Re: Does my outboard need to be rebuilt

I checked the compression today and all <br />6 cylinders were right at 75 pounds.<br />I am having problems in that 2000 to 3000<br />rpm range. Runs real rough.

 

[ODDD1]

Re: Does my outboard need to be rebuilt

hey Dan ...normally comp on a 175 merc 90 or 91 vintage will run between 125 an 135 psi on a cold motor, any thing under 115 an they running quality suffers find another guage and recheck it before you spend the money.....175 v6 cost $2500 to $3500 retail to reman..........

 

[dangerousdan]

Re: Does my outboard need to be rebuilt

ODD,<br /><br />Thanx for the information. Especially about trying another guage. The one I borrowed from a shade tree mechanic looked like Henry <br />Ford may have used it early in his carreer.