rod bearing binding?
#16
Yea but he's saying it does turn easy and then gets more difficult at a certain point. The valve springs/cam should make the resistance vary with crank position. I just never made any notes on how many degrees ATDC does this occur and I sure can't remember...
#17
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4 sets of valves... 2 crank revolutions per cycle... that means the spring tension on the crank will be every 180 degrees. (And the tension usually comes when it's on the exhaust stroke and the intake valve opens before the exhaust valve closes.)
#18
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Rod bearings binding? - Resolved
Thanks to all that posted suggestions. Painfully I disassembled, seems like half the car to inspect my rod bearings. The issue, I believe, as I previously mentioned, was an overtightening of the nuts that hold the bearing caps. After inspecting the bearing caps, they were all aligned by the numbers. Though I did remove the caps and relubed the bearings, I tightened everything back up, according to specs. I did add a step to ensure that the engine turned over. I pulled the fuel pump fuse, installed the timing belt and start motor and then cranked the engine for a couple of rotations, no problem. Now it is all buttoned up and running smoothly.
#20
Thanks to all that posted suggestions. Painfully I disassembled, seems like half the car to inspect my rod bearings. The issue, I believe, as I previously mentioned, was an overtightening of the nuts that hold the bearing caps. After inspecting the bearing caps, they were all aligned by the numbers. Though I did remove the caps and relubed the bearings, I tightened everything back up, according to specs. I did add a step to ensure that the engine turned over. I pulled the fuel pump fuse, installed the timing belt and start motor and then cranked the engine for a couple of rotations, no problem. Now it is all buttoned up and running smoothly.
#21
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I used a craftsman click type torque wrench, it was reading about 10lbs less than it was actually torquing at the required rod bearing nut specs.
#22
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I think you could torque those bolts nearly to yield and not change the shape of the big end. Maybe a bearing was clocked a bit or had debris on the backside or something.
#23
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I agree. Cap and rod end is a lot of material to deflect at 100ft/lbs much less 10ft/lbs. Heck, 10lbs extra could be from frictional losses on the nut itself! Probably had one just a hair off center or not locked into the tab.