Posted by Noah in IA on August 11, 2012 at 18:16:00 from (166.181.3.176):
Hi all,
I noticed a little antifreeze in the oil when doing an oil change last weekend; Dad told me I had better get it fixed before mowing any more (it's his tractor). I searched around this site for a while and read up on some common causes (frost plugs in the head and sleeve seals) I removed the rocker arm cover today and immediately noticed all three frost plugs had antifreeze sitting in them. To prove to myself that this was indeed the source of the leak I went ahead and shop-vacked up the antifreeze/oil mixture out of the frost plug "cups" and then pressurized the radiator to about 4 psi. Antifreeze leaked out of the radiator in several spots but none seemed to seep through the frost plugs. Next I pressurized the system to about 7 psi ; still no leaks from any of the frost plugs, just from the leaky radiator which caused the pressure to drop off real fast. The frost plugs appear to be in good shape (not too rusty) sooo is my coolant leak most likely from elsewhere and not the frost plugs (ie the sleeve seals) or is the leak so small through the frost plugs that I can't detect it. I guess I'd like to know if I should bother replacing the frost plugs or if I need to keep searching for a more severe leak. It's probably worth mentioning that the amount of antifreeze in the drained oil was not all that significant - but rather just enough to notice that it was there (some dark green liquid mixed in). Thanks for any help you guys might be able to offer!
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