Moving along towards assembly. The block went back on the stand today.
Here's a couple of pictures showing how the block was drilled to allow use of a later oil pump. This '89 pump (discussed previously) has a different oiling path that pumps oil through the bearing and, from there, it drains back into the pan. Early pumps draw the oil from behind the seal and may suck in air through the seal. This is better (or simply "better") and the pump itself, although used, is likely tighter than the original one.
The first pic shows the drilled hole and the inside view of the pump. The drain is the oval area. The second pic shows marking the drain area on the block.
I also used Plastigage to size the rod journals. Using one rod and an old bearing, I checked the clearance each journal. All were in the range 0.045mm to 0.075mm which is in-spec (0.02-0.07) or real close to it. Considering the old bearing is a bit worn, it looks really good. This gives reassurance that the rod journals aren't worn and some guidance if the new bearings are too tight or too loose as to where to move the bearings to get a better fitment.
__________________
1980 928S Euro x2
1987 944 N/A
|