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Old 17-04-2011, 20:42   #1
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Antifreeze Change on a Yanmar 4JH DTE

Wondering if anyone has ever had the following experience, 2 years ago I changed from the green anti freeze to orange. Today,300 engine hours later, I drained the system and saw that 1 of the 5 drain locations still had the old green antifreeze. Should I be surprised and more importantly, now that I drained out the green from this area, should I be concerned that the new orange antifreeze added today will/ can reach this area of the engine ? Any thoughts are appreciated.

Ken
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Old 17-04-2011, 21:25   #2
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Re: Antifreeze change question on a yanmar 4JH DTE

which drain (of the five )?
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Old 18-04-2011, 10:06   #3
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Re: Antifreeze Change on a Yanmar 4JH DTE

The only old anti freeze (green) came from the smaller drain on the port side of the engine. There are 2 drains on the port side one is larger than the other. Does that help? I can get more specific but i need a diagram. Thanks for your thoughts!
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Old 18-04-2011, 10:11   #4
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Re: Antifreeze Change on a Yanmar 4JH DTE

on the side where the heat exchanger is located?
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Old 18-04-2011, 10:16   #5
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Re: Antifreeze Change on a Yanmar 4JH DTE

yes that is correct. the drain is right at a small elbow there.
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Old 18-04-2011, 11:59   #6
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Re: Antifreeze Change on a Yanmar 4JH DTE

Sorry for all the q's but trying to figure this out. Heat exchanger drain included a small hose length of approx 6 inches(external to the HX). If it was only a small amount of old antifreeze, I'd guess it was trapped there (in the drain tube) since you last drained the old antifreeze out.
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Old 18-04-2011, 14:18   #7
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Re: Antifreeze Change on a Yanmar 4JH DTE

See the Manual
http://sagaforumet.com/yanmar-manual/4JHE/manual.pdf

Page 6-1
http://sagaforumet.com/yanmar-manual...kapittel_6.pdf
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Old 18-04-2011, 19:01   #8
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Thanks for the manual however that does not really address my concern. I drained about a cup and a half of the old green antifreeze from the one drain plug (after using orange for 300 hours). When I refilled the engine with fresh antifreeze that particular drain had nothing in it (however i could not start engine because it's out of the water). I guess After i run the engine I'll check that the new antifreeze does indeed come thru this one drain port. Is it possible that sections of the fresh water cooling system can get blocked off from other parts? Again your thoughts are appreciated.
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Old 18-04-2011, 19:06   #9
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Re: Antifreeze Change on a Yanmar 4JH DTE

Take a wire and rod out the holes where the drain plugs go. Rust and scale can accumulate in these areas.
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Old 19-04-2011, 05:17   #10
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Re: Antifreeze Change on a Yanmar 4JH DTE

From what I've read from various sources, the green and orange antifreezes aren't compatible. Although both use ethylene glycol as the coolant, they have different corrosion inhibitors. The organic acids in the orange version can cause the silicates in the green version to precipitate, creating blockages. So, perchance's recommendation is a good place to start. There may be a plug of "gunk" blocking the drain plugs.
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Old 19-04-2011, 05:27   #11
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Re: Antifreeze Change on a Yanmar 4JH DTE

Quote:
Originally Posted by Kenalt View Post
Thanks for the manual however that does not really address my concern...
Quote:
Originally Posted by Kenalt View Post
... I can get more specific but i need a diagram. Thanks for your thoughts!
Ken
There's a diagram in the manual.
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