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'.
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 !!!!
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 !!!!
