I have a 1994 Regal 233 with a Volvo Penta 5.7GL engine. I had not used my boat for 5-6 weeks when I hauled it the other day. The engine started first turn and idled nicely. Ten minutes into the trip to the boat ramp I opened the throttle and all I could get was 2400-2600 RPM and a speed of about 10-20mph. I tried a couple of times and it was the same. The engine was running good other wise. I had decided to wait until spring to take it to a boat yard.
Today I started the engine to flush it out and use up some gas. All was good for about 15-20 minutes when I noticed the temp was up to 175, it runs about 155-160. I watched it and after about 2minutes it came down. I ran it for 30 minutes and it did this 2 more times. Each time I felt the risers and the port riser was warm each time but the starboard riser got a little hotter each time the temp went to 175. It cooled down when the temp came down each time.
I gave it some quick throttle advances when the temp hit 150 or so today and it hit 3000rpm easy. I know that's not a good idea but I had to see.
Could this temp problem I am seeing be related to my slow speed? Why would my temp go up and down like that? I'd like to figure this out now so I don't have to worry all winter. Thanks.
Today I started the engine to flush it out and use up some gas. All was good for about 15-20 minutes when I noticed the temp was up to 175, it runs about 155-160. I watched it and after about 2minutes it came down. I ran it for 30 minutes and it did this 2 more times. Each time I felt the risers and the port riser was warm each time but the starboard riser got a little hotter each time the temp went to 175. It cooled down when the temp came down each time.
I gave it some quick throttle advances when the temp hit 150 or so today and it hit 3000rpm easy. I know that's not a good idea but I had to see.
Could this temp problem I am seeing be related to my slow speed? Why would my temp go up and down like that? I'd like to figure this out now so I don't have to worry all winter. Thanks.
