BJ7 Engine Reassembly

[campbellbennet]

I'm restoring a BJ7 that was totally disassembled when I bought it. Presently I am reassembling the engine after much machine shop work. There are two short pipes, one 1/2" diameter by 4.25" long, and one 13/16" diameter by 5" long, both are threaded on one end. I believe the larger screws into the rear main bearing cap, but have no idea where the smaller one goes as it would thread into any of the other three main bearing caps. The manual I have says nothing about them, and the only one I can find in the Moss exploded diagram is the larger pipe.

I expect this will not be the last question I have to ask before this engine rebuild is complete.

JPF

 

[Dandare]

I think some earlier 2.6L engines had the smaller drain pipe, maybe you have some extra bits and pieces in the mix.

Danny

 

[GregW]

One does go on the rear bearing cap. For your mystery piece, at the next bearing, on the distributor side, there is a threaded hole inboard of the oil pan gasket surface.

 

[red57]

The larger diameter one goes in the rear main bearing cap and is a drain for oil caught by the crankshaft scroll. The smaller diameter one is a drain for the oil pressure relief valve and goes into the block next to the oil pump output. Both tubes are arrowed in yellow in the attached picture.

Note: if you are changing to an alloy sump, you will need to shorten both of these tubes to clear the extra thickness of the ali sump.