Kyle Wolfe wrote:Update....
All new Superior cylinders are on and the engine was test run for leaks.
I've got about 5 hours on it over the last few days. No oil leaks, no oil consumption and it's running smooth.
One question for those of you who have replaced all 6 cylinders - how tight or 'draggy' are those new cylinders?
When handpropping through the compressions the engine now has much more drag. I know it's hard to describe and pretty subjective, but what's been your experience? Are new rings and pistons in all 6 cylinders really that more noticable in their drag due to those new tighter tolerances?
The "drag" you mention might be due to the crankcase having been re-torqued and squeezing the main bearings more tightly than previously. (I once had an engine on a Baron suddenly demonstrate excessive "drag" during hand-turning and it developed that a main bearing had "spun" during a cylinder change at a local Cessna dealer in Austin. The engine had to be replaced after the next flight because oil pressure failed due to the spun front bearing.)
The possibility with "top ovhls" is the crankcase to be improperly torqued too
lightly such that a bearing might spin ... or that the bearing is displaced while the cyls are off and the crankcase is not clamped with thrubolts when someone turn the prop in the shop...unlikely in the scenario you've just described. (I realize these comments are not comforting...I just wanted you ..and others...to be cognizant of carefully following procedures.)
I prefer that when doing cylinder changes that thru-bolts be measured for torque-required when disassembly is made and that minimum (lower-range) torque be applied during reassembly to meet that previous torque as a maximum, i.e., the previous disassembly torque measurement is ideal as long as minimum spec per the manual is met and no maximum is exceeded.
Since you've already assembled and run the engine, I suggest you've already operated with the new pre=load on those mains and it is not helpful to startle you with those thoughts, so just keep a close eye on it and remain vigilant towards the possibility. If you've operated more than 5 hours now then it's probably fine. A bearing problem would likely have already shown up by now, but you might want an early screen/filter check.