16 replies to this topic

[wile e coyote]

On the brightside theres no particulate scoring on either main or big ends, the crank float as measured is a little on the high side but no serious issue - the mix and match thrust solution was used on my engine and it's fine... what strikes as odd (and Im using a small screen so tricky to see is apparent localised discolouration on the main at the bottom left? - However when all's said and done I note that the engine had no evident problems before strip down so after a few judicious measurements and thrust change to compensate wear evident and natural owner paranioa - pop in a new set of shells.....

[Sprocket]

That big end bearing wear is peculiar to crank flex. As the crank flexes the big ends nip up. The wear on the main bearings might support this theory, which is why I keep saying to measure all bearing clearances. on a meduim to high mileage car, anything over 0.0025" clearance is going to wear the bearings at a higher rate. If the crank is allowed to move in the bearings its flex increases. Total failure of the center main bearing can see the crank flex more than enough to allow the pistons to touch the head.