hi guys, I wish to purchase the tool to test the cylinder compression but I am not sure which one I should go for.  Do I just search for the one with 16mm? I have found one that contains 12mm, 14mm, 18mm and 20mm.  Surely thats not going to work for us?

 

any one bought one recently? 

Something like this should do you ok - https://www.machinemart.co.uk/p/040814101/

 

Whilst the hex size is 16mm, the actual thread diameter is 14mm, with a 19mm reach, see here for info - http://www.sparkplugs.co.uk/ngk-spark-plug-pfr6q click the additional info tab.

Edited 14 November, 20169 yr by kentphil1

That was very helpful, thank you