How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Noel Schembri Your Own Question
Noel Schembri
Noel Schembri, Marine Technician
Category: Boat
Satisfied Customers: 1951
Experience:  Advanced technical diploma
Type Your Boat Question Here...
Noel Schembri is online now
A new question is answered every 9 seconds

I have a 1980 30' Mariner with two X 225 Mercruisers. Boat

Customer Question

I have a 1980 30' Mariner with two X 225 Mercruisers. Boat laid up out of water but in good condition. Both engines have two NEW heat exchange manifolds each (never seen salt water) and when mains pressure hose water was introduced they ran normal temperature, but now it's floating they both overheat.
Question: Is the likely cause the salt water (external not closed loop) water cooling reticulation not working because of the pump impellers needing replacement?
Many thanks,
Colin Stacey
Grays Point NSW
Submitted: 1 year ago.
Category: Boat
Expert:  Noel Schembri replied 1 year ago.

Hello my name is ***** ***** I will assist you. The impellers normally need replacement every 3 yrs so if they have been installed for more then that it is the first step you need to do. If it still overheats then please post back as we would need to check the cooling systems step by step.