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Old 04-02-2019, 09:07 PM   #1
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Default RAD Flush - Maxum 4100 SCR - 8.1, 502 Mercruiser

Hi folks

I recently removed the heat exchangers from my twin 502's and want to flush and fill the system. Closed cooling of course. I have looked at many diagrams to find a drain plug on the block but the older Mercruiser guides I've looked at haven't been much help and I cannot seem to find on the block. The only thing I can think of is pull a hose, start the engine and put a hose in the exchange and will with water until all the fluid is in the bilge. If anyone has a diagram I can look at to show the plugs and their location, I'd prefer to do it that way.

PS knowing what I know about this boat, I suspect the fluid has been in there for 20 years which is why I am eager to change.

Thanks
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Old 04-03-2019, 12:12 AM   #2
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Go to Documents of this site and get Mercruiser manual 30 for your engine, it has flushing instructions.
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Old 04-04-2019, 06:57 PM   #3
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you mean those big bold letters at the top of the page that say DOCUMENTS that I didn't even see? LOL

Damn! Best advise I've ever received but I'm such a fool.

Thanks Much this is a great resource. :-)
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Old 04-05-2019, 12:21 AM   #4
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Quote:
Originally Posted by ktchristie View Post
you mean those big bold letters at the top of the page that say DOCUMENTS that I didn't even see? LOL

Damn! Best advise I've ever received but I'm such a fool.

Thanks Much this is a great resource. :-)
Trust me you not the only one who overlooks it. If thatís the worst you do your in great shape.
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