Next I assembled the oil
pump Applying assembly lube to the feed and return gears and shaft. Then slipped it into the case.
I torqued the pump and put the keyway, oil
pump, drive gear and snap ring on.
Next the pinion drive gear and gear spacer.
Next I put on the pinion gear, and pinion nut (use red Loctite on threads and taper) and torqued. I then lubed the cam bearing (Torrington) with Vaseline. I installed the cam thrust washer, cam spacer and cam, making sure all were lubed with assembly lube. When doing this all alignment marks must match up. Cam @6 o’clock, Pinion @ 12 o’clock, Breather to line up with cams second mark @ 8 o’clock, on this engine anyway.
Yes I know my marks are off in this pic. I rotated the crank a little.
It should be noted that Prior to the cam being installed, I checked the cam centerline with the nosecone installed. It was fine. If it wasn’t, I would have had to ream the cam bushing.
The next step was to install the nosecone. And then the lifters and housings. Make sure you use an alignment tool in the hole next to the oil
feed on the lifter housing.
I cleaned the cylinders. I use a paper towel soaked in oil.
Next, i set the ring gap. I put the ring in the cylindr and square it by pushing the piston down on it. I check the gap with a feeler gauge and file to spec. I have a ring grinder but a file will work.
I used this to figure out the gap I needed:
bore x .0045 for the top ring
bore x .0035 for the second ring
bore x .015 for the oil rings
Tighened em up just a little.
Next, I put the compression rings on the piston. They do have an order in which they go, so check your specs. Installed the piston, wristpin and clip. The oil rings were next. Because this piston is short, the wrist pin goes through the oil ring groove. So the wrist pin goes in first. Lube everything.
Another thing about the rings is to make sure the gaps are away from each other and not over the wristpin hole. if they are in line you will have a blowby issue and oil contamination. not to mention compression.
Next put the base gasket on, compress the rings and install the cylinder. I use motor oil on the pistons and cylinder wall for this.
I then installed the head gasket and head, torquing in an x pattern. Repeat the process for the next cylinder.