MAin bearings Problems

[enawazh]

Here is the dealeo

I got new bearings 0.25 oversize. Crank was machined. I plastigauged it and all of the bearing clearances checkout according to tsrm. I installed the crank and it spins freely by hand. While i was installing the rings one of the oil control rings came loose and scratched my cylinder. I took the block to the machine shop and had the guy re-hone it.

Now i am installling the crank again and for the life of me i cannot get it to turn smoothly by hand. as a matter of fact it wont turn by hand at all. WTF gives???

Anyone have any input??

ps. I made sure all the bearings went back in the same place that they were removed from during the first crank install.

[gaboonviper85]

Remove all bearings and clean everything again...make sure you put rod in facing the right direction...crank main caps facing the correct direction

[enawazh]

Everything is in the right direction. I undid the rear three caps and the front three and retorqued them and the problem fixed itself.

I have built several 7M's but never seen this before?????It seems like one of the bearings was not sitting properly.

Thnx for the response gaboon

[queenskid926]

hmm great info to know for the future. what brand of bearings did you go with?

[enawazh]

I used ACL bearings for mains and kings for rods. Both are 0.25 oversize

[supra90turbo]

Checked with plastiguage I assume?

[enawazh]

Plastigauge, yes.

All clearances are good.

[IJ.]

Did you seat and check the thrusts?

[Mark Conte]

Everything is in the right direction. I undid the rear three caps and the front three and retorqued them and the problem fixed itself.

I have built several 7M's but never seen this before?????It seems like one of the bearings was not sitting properly.

Thnx for the response gaboon

Take everything back apart and redo it according to the factory service manual. I don't know how you installed it but it sounds like you torqued them 1, 2, 3, 4, 5, 6, 7 and 60% of the time, that will screw something up every time.

The crank doesn't rest on the top half of the main journal at least partially due to the eccentricity of the bearings. It must be pressed/pulled in by the main caps, so if you tighten one cap down at the front of the crank, the rear of the crank kicks up in the air, if you continue along this path you have a twisted crank, how it spun freely the first time (if you did it like this) was just luck of the draw but still not right.

If you do that to a camshaft...it will break. You need to follow the stud/cap and torquing sequence to set the crank uniformly.

Now if you did all that stuff...I don't know why it acted funny. But still I would not run the engine if all you did was loosen the rear few caps and then torque them back down, I definitely suggest pulling it all apart checking everything again and doing it again.

[enawazh]

I got new thrust washers. They are seated and lubricated on the outer side.