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Does the NB8A engine have a CAS at the rear of the exhaust cam and associated \"O\" ring oil seal as per the NA8 The parts diagram I have indicates there is just an oil seal cap there. It's not a good diagram though.

No, it is at the front.

rhysk wrote:No, it is at the front.

Crankshaft Position Sensor is number 6.

Thanks. Yes, I know about the CPS at the front, my question is what is at the rear of the exhaust cam Is it just a blanking seal Photo anyone

JBT wrote:Thanks. Yes, I know about the CPS at the front, my question is what is at the rear of the exhaust cam Is it just a blanking seal

There is a blanking plate. You need to remove the last cam cap to remove it. Not sure if there's an o-ring on it, but a CAS will fit in, so probably... The cam still has the dog drive for a CAS too.
photo on page 46

JBT wrote:Thanks. Yes, I know about the CPS at the front, my question is what is at the rear of the exhaust cam Is it just a blanking seal Photo anyone

OOoooh, sorry, I know what you'r asking now. Matty is right, there is a blanking plate there. You can retrofit an NA8 CAS into that spot. This way, you can disconnect the VVT part of the engine and control engine timing with a piggy back that doesn't know how to control the MX5's VVT.

That's how I learnt what is in that spot anyway.

Okay, thanks folks. I guess in its NB8A guise then it isn't a potential oil leak source like the NA6/NA8 CAS \"O\" ring can be. Cheers.