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Posted by: moggy Mar 9 2009, 07:29 AM

Does anyone know what size is the weird bolt under the pushrods. It's the one thats like a big allen head bolt (I think it's called an XZN or torquehead). I think it threads into the oilways.

Cheers

Moggy

Posted by: Brett W Mar 9 2009, 08:42 AM

It is a secondary oil pressure relief valve. It dumps directly back into the oil pan.

Posted by: Racer Chris Mar 9 2009, 10:45 AM

Try using a 3/8" socket extension.

Posted by: Dominic Mar 11 2009, 07:11 AM

It's a metric 12 point head, size is M14. I actually bought the right tool for it a few years back. That special bolt holds in one of the oil pressure relief pistons and spring.

Posted by: Joe Ricard Mar 12 2009, 03:11 PM

Not pressure relief.
Pressure control.

Posted by: moggy Mar 12 2009, 03:24 PM

Thanks Chris that worked a treat