Starboard engine overheating at low RPM

Comments

• Dream_Inn Member, Moderator Posts: 7,652 mod

  June 2018

  Sounds like either an impeller or blockage in the water line.

  Dream 'Inn III -- 2008 400 Express

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• Black_Diamond Member Posts: 5,439 ✭✭✭✭✭

  June 2018

  +++ on the impeller

  Past owner of a 2003 342FV
  PC BYC, Holland, MI

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• rasbury Member Posts: 8,340 ✭✭✭✭✭

  June 2018

  Yep, impeller more than likely...al what do you think about the ss wear plates and the shorter impellers? Mine worked fine....well assuming I get back in the water..

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• Wildstyle Member Posts: 42 ✭✭

  June 2018

  Ok thanks for your help guys. I’ll get it apart this week and replace the impellers. I YouTube’d It and it seems like a simple job to do...I say that now of course...

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• Black_Diamond Member Posts: 5,439 ✭✭✭✭✭

  June 2018

  Hardin Marine for the SS pumps. Uses std Merc impeller. Wear plates to rebuild. 

  Past owner of a 2003 342FV
  PC BYC, Holland, MI

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• Wildstyle Member Posts: 42 ✭✭

  June 2018

  Quick update: the impellers were both changed, but it’s still overheating. They’re going to haul it out and inspect / flush the coolant system I think next. 

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• Liberty44140 Member Posts: 4,373 ✭✭✭✭✭

  June 2018

  I’d buy the Hardin pump and install before paying for a haul out. Pump will pay for itself in the price of a haul out.

  07' Cruisers 390 (Previous Rinker's: 06' 342EC & 01' 310FV)
  
  

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• rasbury Member Posts: 8,340 ✭✭✭✭✭

  June 2018

  @alswagg I have had good results. It looks exactly like the merc impeller...stainless tops and bottoms and I have the brass pump body. Assuming I ever get back in the water...

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• pistole Member Posts: 158 ✭✭

  June 2018

  If you have a fresh water cooled system, check and clean the heat exchanger. 
  
  

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• Black_Diamond Member Posts: 5,439 ✭✭✭✭✭

  June 2018

  A new impeller with a worn pump will not solve the problem. Basically if you have any grooves where the impeller sides run it will not move water well enough. 

  Past owner of a 2003 342FV
  PC BYC, Holland, MI

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• Wildboating Member Posts: 957 ✭✭✭

  June 2018

  Did you check the recirculation water pump on the front of the motor?  
  
  

  2003 Rinker 342 Fiesta Vee, 350 Mag MPI, Bravo 3 2.20:1 w/ 22p 4 x4 props
  
  

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• earl1z19 Member Posts: 342 ✭✭✭

  June 2018

  A new impeller with a worn housing will actually make the situation worse. The old impeller has the groove already worn in the end to match the worn housing where the new impeller does not.

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• pistole Member Posts: 158 ✭✭

  June 2018 edited June 2018

  Unless the sea water pump's impeller was completely gone, it's unlikely to be the cause of your overheating. 
  
  Check for airlock in cooling system  (easy) , belt tension (easy) , and maybe obstruction in cooling system  (harder)

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• Wildstyle Member Posts: 42 ✭✭

  June 2018

  pistole said:

  Unless the sea water pump's impeller was completely gone, it's unlikely to be the cause of your overheating. 
  
  Check for airlock in cooling system  (easy) , belt tension (easy) , and maybe obstruction in cooling system  (harder)

  Yep that’s exactly what it was. It was an airlock...apparently they didn’t tighten the hoses all the way when getting it ready for summer. Tightened them up and problem went away! Whew!

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• aero3113 Member Posts: 9,014 ✭✭✭✭✭

  June 2018

  Great fix!!

  2008 330EC

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