Howdy all!
I'm in the midst of my first engine rebuild. I got everything back from the machine shop and I have started reassembly.
I have the main bearings in. Crankshaft in. Main bearing covers in. I lightly coated the journals and the bearings as I put everything in. Without tightening the bearing covers, I can turn the crankshaft. It requires a little muscle, but it turns.
Specs call for the main bearing covers to be tightened to 90-108 ft-lbs. I figured I'd go middle of the road, so I set my torque wrench to 100 ft-lbs and tightened everything down. I tried turning the crankshaft and it didn't move. I loosened the bolts, except I couldn't get one of the bolts on the front cap to budge. I worked on it for 30 min with the impact wrench, but it would not move.
So I went ahead and tried tightening everything to 95 ft-lbs. Again, no crankshaft movement, so I backed them off again.
Finally, I tried going down to 90 ft-lbs. I checked movement with each cap I tightened. I tightened the front cap last, as it still had one bolt tightened to 100 ft-lbs. It still moved easily right up until the very end. Once I tightened the loose front cap bolt to 90 ft-lbs, it became difficult to turn the crankshaft. I can turn it, but it's not easy.
My question is two fold. How easily should the crankshaft turn in it's current state. Second, should I continue trying to break the bolt tightened to 100 ft-lbs, or let it be?
Thanks for any help!
brent
I'm in the midst of my first engine rebuild. I got everything back from the machine shop and I have started reassembly.
I have the main bearings in. Crankshaft in. Main bearing covers in. I lightly coated the journals and the bearings as I put everything in. Without tightening the bearing covers, I can turn the crankshaft. It requires a little muscle, but it turns.
Specs call for the main bearing covers to be tightened to 90-108 ft-lbs. I figured I'd go middle of the road, so I set my torque wrench to 100 ft-lbs and tightened everything down. I tried turning the crankshaft and it didn't move. I loosened the bolts, except I couldn't get one of the bolts on the front cap to budge. I worked on it for 30 min with the impact wrench, but it would not move.
So I went ahead and tried tightening everything to 95 ft-lbs. Again, no crankshaft movement, so I backed them off again.
Finally, I tried going down to 90 ft-lbs. I checked movement with each cap I tightened. I tightened the front cap last, as it still had one bolt tightened to 100 ft-lbs. It still moved easily right up until the very end. Once I tightened the loose front cap bolt to 90 ft-lbs, it became difficult to turn the crankshaft. I can turn it, but it's not easy.
My question is two fold. How easily should the crankshaft turn in it's current state. Second, should I continue trying to break the bolt tightened to 100 ft-lbs, or let it be?
Thanks for any help!
brent