I'm trying to assemble the bottom of my b20 and I'm having a hard time installing the thrust bearing next to #4 main cap. There doesn't seem to be enough space for both. Any suggestions?

 

sorry for sounding stupid, does it go on #4?

 

Hi. I'm sorry but I've figured it out. My bro showed me where it goes. I mistakenly thought that one half went between the main cap and the crankshaft when it actually goes on the other side of #4 main cap support on the block. In other words, I was trying to stack the bearings on top of each other rather than set them on opposite sides of the main cap support.

 

Two bearing halves, one on each side of the crank journal, completely surrounding the crank journal, yes. Kewl, simple mistake, thanks for posting the FIX.

Did one of the bearing halves have a hole in it to allow oil to flow through it, maybe they both had holes, maybe niether. Is it possible to be each one in the opposite side in the cap and cap support or are the indexed to only fit in one location.

 

The thrust bearings are sold as a set. It includes two like pieces (at least that is what I believe, because that is what I assumed while installing them). The bearings keep the crankshaft from moving in a direction parallel to its long axis. They are installed against a machined surface on both sides of the #4 main crankshaft bearing support that is cast into my B20B engine block. There is no provision for the bearing to fit against the main cap on either side. There are no oil holes in this bearing although it has two of what I will call vertical grooves machined into the bearing face of it. It is also bevelled on the ends. There is what I guess is a partial part number or a casting number on the side opposite the bearing surface. Hope that was helpful and not confusing.

 

You also should plastigagethemto check for oil clearance, interference fit. This will verify too loose or too tight, lose of oil pressure or not enough space available for oil lubrication.