View Full Version : Yanmar 4JH2E freeze plug leaks

06-26-2009, 02:39 PM
I have a 1993 4JH2E that had a pin hole leak in a freeze plug about two years ago which I cleaned and plugged with epoxy putty and added new antifreeze. I still have a very slow leak from it and now another plug which amounts to a few table spoons per month. Use is only about 100 hours/year. Any stop leak products that can be added and how often should antifreeze be changed? Use in NW USA.

07-08-2009, 02:26 PM
"Hi Larry:
I have a 4JH2E 1993 as well, and had the same problem. You can buy replacement plugs and replaced the leaky ones IF you can reach them with tools. Otherwise I am not aware of any stop leak product."