Posted by Tom Fleming on December 10, 2011 at 15:34:00 from (206.193.250.146):
In Reply to: Reassembly Lubrication posted by Jim Paterson on December 09, 2011 at 16:52:46:
Think about it this way. You put your tractor away for the winter (for those of you who don't use them all year). What do you think happens in the spring when you start them up for the first time? All the oil has left the filter cannister, and the oil has also run out of the journals on the crank and the rest of the block. Not much difference, except that the rings and bearings have "run in".
A brand new engine should have assembly lube. I personally crank a brand new engine over with out the ignition on for a bit to get the oil moving, but believe me, the oil starts to run out of the journals, galleries, and the filter immediately after you stop cranking it. There absolutely is some residual oil, but the journals and passages are NOT pressured up. If you use assembly lube, and put some oil in each cylinder (as is good rebuild practice), you prevent "dry" start damage. Heck, the IH manuals tell you to add oil to the cylinders after "long periods of storage".
On the letter series engines, all the rod and main bearings run on the oil film between the inserts and the crank, and it is the pressure of the oil flow from the oil pump NOT the bearing surfaces that the bearings ride on. On the F series, they do not ride on an oil film, and they do ride on the bearing surfaces (splash lube). Either engine should have assembly lube when first starting a brand new rebuild. There after, does anyone pressure up their oil systems before starting? hardly. Assembly lube is just good practice on ANY engine rebuild. A dry start can and ususally does either ruin an engine, or severely reduce bearing and ring life.
So, before anyone takes great offense to what I have posted, or spends hours typing about "what my brother's cousin's sister's father" did, think about how these engines work, and what the oil deliver systems do. Dry starts on a fresh rebuild is a big NO NO.
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