Honda BF45A - outlet water flow rate

[glidepath]

Hi,<br /><br />I have a pair of 9 year old BF45A outboards. When the boat is out of the water and I flush them with the muffs, I notice different flow rates in the outlet cooling water.<br /><br />On the starboard engine, the flow from the telltale is very strong, but the flow out through the hub exhaust is only medium and varies. <br /><br />On the port engine, the flow from the telltale is only medium, but there's a strong constant flow out through the hub exhaust. <br /><br />After a 10 minute warm up period, the water from the starboard side feels warmer than the port, but neither are uncomfortable to touch with my hand.<br /><br />Both engines are running well, and have had new impellers and new thermostats fitted about 6 months ago. Neither is giving overheat warning, even after long high-speed running. Also, I keep the water intake under the cavitation plate covered during flushing.<br /><br />I'm just wondering if the different flow rate is a warning of trouble ahead.<br /><br />Thanks.

 

[hondon]

Re: Honda BF45A - outlet water flow rate

Probably not.More likely we have an obstruction at the telltale .Best way to tell if we have a problem is to compare temps at the tstat housing.You have done that to an extent and it sounds like you are good to go if not running a little cold.That stack always gets pretty warm and tstat values have changed over the years for this engine,especially in cold water conditions.