A-Type and B-Type cylinders mix

Hi Ray

Well the simple answer is you can use both A and  B however you need to match the pistons to the cylinder size.  There is a slight difference between the 2.  If you have A cylinders they are very slightly smaller than the B cylinders.  The pistons if you note on the parts manual are also a bit difference to get the correct piston to cylinder wall clearance.  So that said you should not mix the pistons from the smaller group into the larger cylinders and especially never mix the larger piston group to the A cylinders.  In that later case it would perhaps lead to a failure of the piston to wall clearance and might let you down.  

Use the heavy maintenance manual and go to the forum charts for the pistons and cylinders.  You can find all the tolerance groupings and what is allowable.  It also explains how to measure the piston and the cylinders correctly.  If you are not familiar with that portion look for a accredited iRMT to help you.  As information it is extremely rare to ever have to replace the cylinders as this is a liquid cooled engine and the bores are a special coating that will wear for many thousands of hours in normal use.  Even at overhaul the pistons and cylinders are on condition,, only the rings need replacement at TBO providing all else measures within the limits.  

Cheers

Thank you for your clear explanation on the topic. It matches with our understanding too.

But just for information, we get engines where cylinders are found badly worn out, leading to replacement of all cylinders.

Kind regards.

Ray