rhillman75
Petty Officer 2nd Class
- Joined
- Jul 28, 2010
- Messages
- 176
From previous threads I have had with my 1989 Mercruiser 5.7L with possible overheating issue. I changed the t-stat from 165 degrees to 142 degrees, new impellar, and new water hose from upper drive housing transom. With the motor on the muffs for 20 minutes at idle and temp guage at 142 degrees, what is the ?ideal? temp the manifolds should be at and the ?ideal? temp the riser should be at. I cleaned out both manifolds at both ends and have collected ? ounces of kitty litter sized metal fragments. Now I do know that all engines run differently, but what are some ?baseline? temps that I can refer to. My boat is about an hour away and the HOA doesn?t like a 30 foot Regal in my driveway that long for diagnosing. The motor temp still tends to increase when I give it throttle at 1500 rpm, but goes down when it is returned to idle. I was kind of hoping to get an idea of to look for before I start ordering parts. I have flushed both manifolds and risers for upwards of 30 seconds 4 or 5 times.
