Coolant leak 620

onefarmer · Posted: Sun Jan 20, 2013 6:11 pm Post subject: Coolant leak 620

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?

RLA · Posted: Mon Jan 21, 2013 4:54 am Post subject: Re: Coolant leak 620

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.

RLA

onefarmer · Posted: Mon Jan 21, 2013 5:13 am Post subject: Re: Coolant leak 620

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

BushogPapa · Posted: Mon Jan 21, 2013 10:32 am Post subject: Re: Coolant leak 620

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..

Ron.

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