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| Name: |
Rickiray
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To Anchorbaydon
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8/9/2004 7:20:22 AM
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Hi. How big a job is it to change the thermostat on a 5.0 L mercruiser. Can I do it myself?
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| Name: |
AnchorbayDon
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To Anchorbaydon
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Date:
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8/9/2004 8:19:58 AM
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It's usually not a big deal, depending on how the boat mfgr built the boat around the engine to cramp engine access. Be sure that you have a new gasket in addition to the thermostat before starting as the old one probably will be ruined in the process.
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| Name: |
AnchorbayDon
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MOre info
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Date:
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8/9/2004 8:24:35 AM
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If your mercruiser 5.0 is multi port injected (MPI), don't use too cool of a thermostat as the engine really needs to run > 170 degrees for the fuel to vaporize properly. If it runs too cool, you will waste fuel, foul your plugs and run amazingly rough!
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| Name: |
Rickiray
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MOre info
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Date:
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8/9/2004 9:08:43 AM
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It's an EFI , the manual says it shoud run 160. It usually runs about 185, but it runs great . It just worries me that it's higher than what the manual says.
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| Name: |
AnchorbayDon
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| Subject: |
More info
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Date:
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8/9/2004 12:08:15 PM
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Follow the manual's recommendation as closely as possible. The new marine engines are very particular about the temp that they run at as well as the fuel they use. That is why no marinas here even carry 87 octane fuel - the marine engines are just not built to run on anything less than 89 octane. If people persist in using lesser fuels, it may run OK for a while, but they will pay for it in the long run.
The other false economy relates to filling your fuel tank from portable (5 gal) gas cans. That is the best way I know of to introduce water into your fuel system. Most of the marinas on Lake Martin have new fuel systems that are incapable of pumping water with their fuel, but if there is any water or condensation in a 5 gal can and that can is inverted to fill a boat tank, guess what goes into the boat first? Most 'water in gas' events that we see are from a boat being sunk or being regulalry filled from portable, inverted tanks. People think we say this to sell more gas - that's simply not true.
People that refill their boats regularly from portable tanks at least need to replace their water-seperating fuel filter very often.
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| Name: |
Rickiray
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More info
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Date:
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8/9/2004 12:30:43 PM
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Sounds like good advice on the gas. So what do you think I should do about my temp? I had a guy at River North look at it in the water and he said it's fine. Like I said , the gauge reads 185, and it's been that way since i got the boat. Is it possible that i've had a bad thermostat all this time? I can touch the water outflow risers while the engine is running and they are hot but not too hot to touch.
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| Name: |
Rickiray
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| Subject: |
More info
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8/9/2004 1:32:04 PM
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I checked my owners manual regarding fuel octane. It is recommended to run on 87 octane. The engine temp question / issues is knawing on my mind. I'm not sure what to do...
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