One more post- need to buy a spark plug socket- what size does a 850 take? thanks!

 

It should be 5/8" if your using volvo plugs.

 

OK, good thanks!

 

And a 6" extension. Thread the spark plugs back in by hand (I use the spark plug socket and then just twist the extension without the ratchet) so as to not cross thread them. Once they seat go ahead and use the ratchet to torque them down.

...Lee