"I have a 1987 5.7 Mercruiser
"I have a 1987 5.7 Mercruiser with 3300 hours. each year for the last 3 years it has started the season with an overheating problem at low rpms. I change the impeller and it runs fine.previous to this I usually changed the impeller every 3 years as a precaution. Has anyone ever done an acid flush in their motor and do you think this might help. The boat is used in fresh but I thought I might have some excess buildup of silt and rust.
Thanks, Rick"
"I have a 1987 5.7 Mercruiser with 3300 hours. each year for the last 3 years it has started the season with an overheating problem at low rpms. I change the impeller and it runs fine.previous to this I usually changed the impeller every 3 years as a precaution. Has anyone ever done an acid flush in their motor and do you think this might help. The boat is used in fresh but I thought I might have some excess buildup of silt and rust.
Thanks, Rick"