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Forum: Engines and Propulsion Systems

19-04-2014, 10:04

Replies: 27

Flushing Yanmar 4JH2E Coolant

Views: 19,604

Posted By delmarrey

Re: flushing Yanmar 4JH2E coolant

You can't go by color anymore. There are many grades by the same manufacture. You need to go by the code #s. Some are for cast iron, some for aluminum and some for brass. In the old days brass and...

Forum: Engines and Propulsion Systems

19-04-2014, 08:37

Replies: 27

Flushing Yanmar 4JH2E Coolant

Views: 19,604

Posted By delmarrey

Re: flushing Yanmar 4JH2E coolant

BTW Yanmar recommends a special grade of antifreeze. The Texaco product Code #7997 & 7998 or Havoline/Chevron #7994.
I ended up at a NAPA store to find the right stuff.

Here's the Operational...

Forum: Engines and Propulsion Systems

18-04-2014, 23:40

Replies: 27

Flushing Yanmar 4JH2E Coolant

Views: 19,604

Posted By delmarrey

Re: flushing Yanmar 4JH2E coolant

Yes, all water rinses. And you just need to run it up to temp to open the thermostat.

Forum: Engines and Propulsion Systems

18-04-2014, 23:27

Replies: 27

Flushing Yanmar 4JH2E Coolant

Views: 19,604

Posted By delmarrey

Re: flushing Yanmar 4JH2E coolant

Without knowing how many hours on the motor I would be cautious about using a flush chemical. It could eat thru the heat exchanger unless you know when the last time the exchanger core was serviced....

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