07-12-2018, 04:17 PM
Hi Mr f,
I would suggest before putting the crank into the case you assemble the centre main onto it and make sure it turns OK. Although it seems blindingly obvious now, I've recently discovered the hard way, that individual bearing housings are not directly interchangeable. If your pair come from a previously running engine you should be OK but if not better to know before the engine's too far built? You can bolt them together roughly with two 3/8BSF x 4" set screws, the shells centralise the two halves together. There would be no harm in also trial assembling the big ends to check they're free as well, which leads onto doing a rod straightness check with a king pin through two adjacent little ends 1 to 2 and 3 to 4.
Dave
I would suggest before putting the crank into the case you assemble the centre main onto it and make sure it turns OK. Although it seems blindingly obvious now, I've recently discovered the hard way, that individual bearing housings are not directly interchangeable. If your pair come from a previously running engine you should be OK but if not better to know before the engine's too far built? You can bolt them together roughly with two 3/8BSF x 4" set screws, the shells centralise the two halves together. There would be no harm in also trial assembling the big ends to check they're free as well, which leads onto doing a rod straightness check with a king pin through two adjacent little ends 1 to 2 and 3 to 4.
Dave