40c engine main bearing cap direction

rooster · Post by **rooster** » Wed Mar 07, 2012 7:59 pm

Could someone tell me what direction does the main bearing tabs go on a 100cid jd
Towards the cam or not. The engine I tore down had the tabs opposite to the cam, is this corrrect

Dave T · Post by **Dave T** » Thu Mar 08, 2012 2:43 am

Is there not a tab relief in the block ? Or an oil passage that will determine direction?

rooster · Post by **rooster** » Thu Mar 08, 2012 8:23 am

There is a tab in the block opposite to cam side. There is a tab in the main cap also. But the question is what side does the tab in the main bearing cap go since you can flip the main bearing cap etheir direction. Origanlly they were opposite to cam..

waterman28 · Post by **waterman28** » Thu Mar 08, 2012 12:17 pm

Tab to Tab I believe

Dave T · Post by **Dave T** » Thu Mar 08, 2012 5:20 pm

Yes tab to tab at least on any eng. I've ever rebuilt. the tabs keep the bearings from spinning on both the mains and rods. tab to tab keeps the bearings in place no matter the rotation. Pay close attention to the oil ports in the bearings that they match up with the oil passages in the block for the mains and cam bearings.

Post by **Lavoy** » Thu Mar 08, 2012 6:42 pm

The only thing that goes towards the cam is the dimples on the connecting rods, main bearings are as previoiusly described.
Lavoy

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40c engine main bearing cap direction

40c engine main bearing cap direction

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