CBR 600F3 1995 - 1998 CBR 600F3 Forum

'95 F3, Coolant in oil, NO oil in coolant

Old 05-11-2018, 09:02 AM
hamlin6's Avatar
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I honestly don't know. There are people on here that have a lot more top end experience than me. They may have some insight
Old 10-05-2018, 09:33 PM
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Default Car 600 f3

Originally Posted by hungrycamel View Post
Update: fixed it. Absolutely the dumbest, smallest thing that cost me way too much time and money.

Turns out the two sealing plugs in the head had backed out so far that coolant was weeping right past the threads. Torqued them down and the system has been holding steady pressure for ten minutes.
Old 10-05-2018, 09:34 PM
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Where are these screws located?
Old 10-06-2018, 08:46 PM
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When casting something as complex as an engine head with a metal that cools as fast as aluminum, the 'pour' must happen quickly. Experimentation with early revision parts may show the engineers sections of the casting that can form air pockets that are resistant to the flow of the molten metal. In such cases, a 'port' is usually introduced to the casting that allows for the quick escape of trapped air. Such a spot in the casting may require machining and plugging before the part is ready for service.
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