3yrs after re-power starting to run hot

[rbryn]

I repowered 3yrs ago, a complete replacement including all attached pumps, alternators etc.

I'm raw water cooled and in saltwater, we average 200hrs a year in usage.

This summer I've watched the temp gauge slowly climb each time I go out, normally it reads about 175-180, today we were running about 200-210. It's the original 2003 analog gauge so I have to estimate it a bit.

Any thoughts?


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[islandhopper00]

Robert, need more info.
Is your boat trailered, or slipped?
Do you flush the motor after every trip?
Use salt away?

Salt water left in the engine is corrosive, and after 3 years could be your problem.

 

[Lazy Daze]

The most common thing would be it might be time for an impeller change.

Do you run in shallow, sandy water a lot?

 

[hottoddie]

My bet is you need exhaust elbows at a minimum. Maybe manifolds as well. Get an infra red thermometer and check the temps at the thermostat and exhaust component s.

 

[rbryn]

Thanks guys.

The boat is kept in the water year round. We flush it regularly with fresh water after trips but don't use saltaway(yet).

The area is sandy bottom but we never really operate in areas that are shallow enough for it to ingest sand (family is a funny, they like to swim and not touch the bottom at all).

I'm guessing (or hoping I should say) that it's time for the impeller change, I admit I've been a little lax on changing it out, we normally do it every 2 years but we've just been enjoying it too much for a haul out.

 

[Westie]

No need to do a haul out to change the impeller on a bravo III. When you remove the water intake hose just have something available to plug it quick. A tapered wooden plug works well for that or even a rag stuffed into the end of the hose will work.

 

[Lazy Daze]

No need to do a haul out to change the impeller on a bravo III. When you remove the water intake hose just have something available to plug it quick. A tapered wooden plug works well for that or even a rag stuffed into the end of the hose will work.

Agree. AND, if you don't already know this, Westie, don't try to do the impeller change in the boat. Take the entire assembly off the boat - remove it by removing the BRACKET from the engine with three bolts (don't try to remove the actual pump, first).

 

[CliffA]

No need to do a haul out to change the impeller on a bravo III. When you remove the water intake hose just have something available to plug it quick. A tapered wooden plug works well for that or even a rag stuffed into the end of the hose will work.

would something like this work to pinch the water hose closed instead of plugging the hose?.....if so you can get a pair for $4 at Harbor Freight Tools.....

cliff

 

[Westie]

would something like this work to pinch the water hose closed instead of plugging the hose?.....if so you can get a pair for $4 at Harbor Freight Tools.....

cliff

It might work but you are putting stress on the hose when you pinch it off. One part of the wall of the hose will have a very small bend radius, which could cause it to develop cracks. I would plug it myself rather than pinch it. When my water pump failed and I had to replace it I left the hose plugged for a day with no issues.

 

[rbryn]

Thanks. Being a novice.. The thought of stuffing anything in a hose with water running into the bilge terrifies me. I'll haul it and feel a bit more confident with it. This will be the first time I've done this on my new engine. It was a breeze on the older engine. This one looks like I have to disassemble a bit just in order to get to the pump to remove it.

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[rbryn]

Just following up on this one with the results. Before we hauled her out to replace the impeller I decided to go ahead and replace the thermostat since it's a quick easy job.

Pulled the old thermostat out, put a new one in and she is now running 170-175 with no issues. The thermostat was in n pretty poor shape considering that we flush it after every use.


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