manifold help?

weekender1

Petty Officer 3rd Class
Joined
Apr 12, 2011
Messages
99
i have a merc 165hp inline 6 and removed the side plates from the manifold and found alot of rust inside of it how to clean that out and get better water flow??
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: manifold help?

If the manifold is plugged up, you replace it not just clean it out. Since it is the cooling system, rust is normal. Do you have a cooling problem? Being in Ohio with fresh water, I can't imagine it being plugged up. If you do have a cooling problem, have you checked the raw water pump, thermostat, riser etc.?
 

weekender1

Petty Officer 3rd Class
Joined
Apr 12, 2011
Messages
99
Re: manifold help?

i ran some water threw the namifold and it flowed pretty good some rust came out i read some place to rod it out?? as for the thermostat and water hoses all looks good but still going to replace the thermostat. was thinking about running a gallon of mirax acid threw it just to help clean it some more. the last time i ran the motor it never over heated on me and did run good..
 
Top