Engine riser hotter on one side.

Peter Z

New Member
Jun 26, 2018
29
Boat Info
2000 Sea Rayb Sundancer 340
Engines
Mercruiser 7.4 Horizon
2000 Sundancer 340. 7.4 Horizon fresh water cooled.

One riser on my starboard motor felt much hotter thank the other. I took off the hose that leads from my sea water pump to the oils cooler and found a bunch of old broken impeller pieces blocking up 90% of the oil cooler. After removing the pieces now the riser is much cooler but still warmer than the port motor. Should I replace the oil cooler? What else could be keeping it warmer? FYI my risers and manifold were replaced last year with Merc parts and only have about 15 hours on them.
 
Normal...you should be able to keep your hand on it, if it's hotter than that you have a problem. Water takes the path of least resistance that's why one will be cooler.
 
Normal...you should be able to keep your hand on it, if it's hotter than that you have a problem. Water takes the path of least resistance that's why one will be cooler.
Thank you.
 

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