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Coolant leak 620

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01-20-2013 18:11:46

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I have a JD 620 that has just a slight coolant leak. It leaks into the left cyl when it's not running. The longer it sits the more it gets in the cyl. It doesn't get in the oil and I'm not getting any bubbles in the radiator. It started this after I put a redone head. I'm thinking the head gasket but it only leaks into the cyl but not out?

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01-21-2013 04:54:09

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 Re: Coolant leak 620 in reply to onefarmer, 01-20-2013 18:11:46  
For your sake I hope it"s head gasket related. Did you the the surfice"s checked for flatness? I have two ar5621 heads that are cracked, both inside the exhaust valve port, both showed no bubbles while running. Both didn"t give me a problem until I retorqed the heads. What I found out too late I had the carb set too lean, exhaust port temps too high. & Both started like yours & got worse, quickly.


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01-21-2013 05:13:39

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 Re: Coolant leak 620 in reply to rla, 01-21-2013 04:54:09  
The head was completely redone, it was shaved on the chamber surface and the manifold surface, valve seats replaced and new valves. I haven't used it hard yet, and it's been three years since installation

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01-21-2013 10:32:47

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 Re: Coolant leak 620 in reply to onefarmer, 01-21-2013 05:13:39  
If you have "Re-Torqued" the head, was it Totally Heat-Saturated, before you Re-Torqued the Head..???

NOT just "Warmed-Up"..HEAT-SATURATED.....

If so, there is still Sealers you can try...

Would be a good idea to get it out and put it to Work and see is it seals up..

They can seep sometimes for quite a while before they seal..


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