It is called an oil gallery plug and plugs the end of the main oil gallery which supplies oil under pressure to the crank bearings.There is also one on the other side directly oppisite. It can be used to check the oil pressure by removing the plug and attaching an oil pressure guage to it. When you replace the plug, replace the O ring also and tighten it to 8 Nm and do not overtighten it as it is easily broken.
The head fell apart on mine but the recess goes into the engine so was able to unscrew with an allen key
So should we all change ours before we all suffer the same. Cant see why the plug is so expensive tho.Having just changed the coolent - when you remove the drain plug nothing comes out untill you take off the filler cap- wouldnt this be just the same, or even less so as the oil is thicker and is not so far above the draining hole and so dosent have a head of pressure above
You come up with some great theories fazersharp
QuoteYou come up with some great theories fazersharpI have been told before but with different words, and not so generous as yours.Sooo im not to touch it then am I