Leak Down Procedure (Pic Heavy)
First, excellent post ! THX added.
Second, I (with Your permission Sir). would like to add an note on the hot/cold test
parameters.
Pistons are, always have been, and always will be of an 'cam ground' design--- read the larger mass across the pin bosses , when heated, 'pulls' the smaller mass of the casting/forging into a circle.
Apologies, suffice to say, do the test no more than 10 min after normal operating temp has been reached.
Now Sir on to My humble answer on Your rebuild 'Q'.
I wrote down all the results:
Might be time for a rebuild, what do you think?
Left bank total % = 56.
Right bank total %= 60.
total variance 4%...bank to bank anyway. further,
#1-#2 delta , 4%.
#3-#4 delta , 4%.
#5-#6 delta , 5%.
#7-#8 delta , 1%.
'Delta' an term used for 'total' overall engine 'sealing' health. as it were.
In Your case Sir 14% total delta = changing #8 when it oil fouls, probably
after 3-4k miles
Thx to the board for My long winded reply !!!!