Fitting a new seal to the crankshaft scraper assembly. Note the IMS tucked in place.
Another view of the crank carrier combo showing new, updated chains in place and still a little stiff as well as new wear pads for the tensioner paddle and guide. At the time this engine was built, we did not have LN Engineering's billet IMS tensioner blade which we since then use on all rebuilds in place of the original cast part.
Lubrication during assembly is key! All components that come into contact with another component must be lubricated or wear will be experienced during assembly and initial start up. As we build by feeling, areas where additional sensitivity to feedback is needed, we use straight 30wt break-in oil. On items like chains and wear pads, a thicker assembly lube like that supplied by CMW Oil Co. is good where you want to keep dripping and drainage of lubricant to a minimum.
Here we have dropped the crankshaft carrier combo as a unit with timing chains attached into the crankcase half.
Note the connecting rods for cylinders 4-6 protruding from the carrier unit.
After tightening a few fasteners and attaching the cylinder 1-3 rods and rod caps onto the crankshaft assembly I roll the crankcase half over with the crank carrier combo installed to verify and record our cylinder 1-3 deck heights. With the LN procedures the case decks are surface ground and this means excellent accuracy, all our deck heights were within .0015 of each other, which makes for even combustion balance and a very smooth running engine!
Here we have installed the 4-6 crankcase half and inserted the special tool used for piston alignment for the 4-6 position pistons.
Another view of the tool inserted through the access hole. Through this hole we are about to be assembling the entire 4-6 bank of the engine using only skill, sense of feel, and the aid of a borescope to check our work.
Cylinder #6 with it's piston installed and pushed down the bore with the alignment tool inserted through the access ports in the cylinders. This special tool aligns the piston and the connecting rod to aid with the assembly of the wrist pin and retaining clip. This particular cylinder and piston are THE MOST difficult to assemble as they are deep within the confines of the engine and all work must be done very patiently with the use of sense of feel and the borescope. The wrist pin clip must be inserted into the piston effectively and one small goof results in a failed procedure and a clip that fires it's self into the crankcase, requiring tear down to fetch it!
If this occurs hours of labor are lost...