I am ready to do the compression test on my 13B but the instructions say to put my modified compression gauge in each trailing plug hole. I see the 4 plugs on the driver's side of my NA 13B. Which two are trailing, the two lower-most plugs?

Thanks

Steve

 

The top plugs are trailing & the bottom ones are leading. There will also be the letters 'T' and 'L' cast into the housings.

 

Is it correct that I use the trailing plug holes for the compression testing? I have a gauge with a removable schrader valve that I will take out so I can check the individual rotor pulses

Thanks

 

i use the leading.

 

Most guides say to use the trailing holes, but I've done both and had the same results.

 

Ya trailing top... leading bottom.. I have NGK wires trailing is blue and leading is black.. That might help a little bit.. Also I have NGK plugs and there is blue rings around the trailing plugs and there is nothing around the leading plug

 

www.rotaryresurrection.com hit on your generation of car,then hit:Tech ..and enter the section.then read away..good stuf in there.

 

Thank you!!

 

To provide overkill to this thread.

The simple way to remember is.

(T) - Trailing Top
(L) - Leading Lower