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I just have a question that appears not to have an easy answer. I have recently noticed that I was leaking coolant behind the engine on my S1 R33. I was able to trace it down to coming out of a hole above a core plug. This hole I believe functions as a drain for the Spark Plug valley. However next to the spark plugs are what look to be either bolt or plugs that coolant seems to be leaking out of.

I tried tried to unbolt these, however they are impossible to remove, what's further is that any application of force seems to strip what appears to be a Hex head. I have measured the inner diameter of the Hex head with a vernier caliper and it is 10.5mm, which is pretty odd. For the moment I have applied some sealant to this to stop the leak.

Any comments if the pictured are bolts or plugs? (Please note: not my engine)

jj03ux.png

Edited by Penitent_Spark

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