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Lawn tractor blowing antifreeze
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Posted by farmerbil (My Page) on Fri, Nov 20, 09 at 4:57
| I have a john deere 345 with a fd590v kawasaki motor that started blowing antifreeze out the exhaust. I thought it might be a blown head gasket and removed the heads, they looked okay but I replaced them anyway to no avail, still blowing antifreeze. There is no evidence of antifreeze in the cyliners, oil, or plugs either. I appreciate any advice/suggestions, thanks. |
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RE: Lawn tractor blowing antifreeze
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| A pressure test of the cooling system would be called for in this case. It might be due to a crack in one of the heads, that has spread into the exhaust passage. To identify which head it may be, you probably need to drop the exhaust manifold (if a common manifold serves one muffler) to observe if any antifreeze is leaking into an exhaust passage in the head. You need to remove the spark plugs while you pressure test the system because if there is a cracked head involved here, and the exhaust valve of the offending head happens to be open during the test.....antifreeze might flow into the cylinder and fill it up before running out the exhaust port. It sorta would depend on whether the exhaust passage slopes uphill or downhill from where the crack/leak is whether it would run to the cylinder. Don't put the spark plugs back in until you have spun the engine with the starter (after the test) or you may get a hydrolock condition due to coolant in the cylinder. And when you do get ready to spin the engine with the plugs out, watch carefully to see if any coolant is blown out of a spark plug hole. You might need to leave the pressure tester connected and pumped up to system spec pressure for a while (hour or more) to see results. If you don't have a cooling system pressure tester, might be justified in buying one for this, make sure that the tester has an adapter that will fit your radiator (take your radiator cap with you). |
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