Severe Issue

[MooMoos14]

Alright here's the story,

we got the bottom end all put together, Pistons on the crank and torqued, bottom end all together, Before we torqued it down, The crankshaft could turn with some moderate force, But not to much. When we torqued down the Crank cradle,(In 5 steps from 20ft-lb to 85ft-lb in the nissan torque sequence) When we went to put the engine at TDC, I used a 27mm socket and a 2 foot breaker bar, and the engine wont spin at all... I even put all my weight on the breaker bar and I felt like I was going to break the main crank bolt.. My question is for you guys, Could we have the wrong sized bearings? My buddy took the block and crank to a machine shop, He measured everything and said that the bearings he had IN the engine (Which was used) the sizes were fine, And to order those sizes.. So my friend ordered OEM sized bearings from ACL.

Here's what I said to my friend to try and explain it more in depth.

When the machine guy measured the old worn bearings, Those sizes were fine.. Because they were old and worn down, They were within tolerances. When he ordered new OEM bearings, They were thicker than the old worn down ones.. So of course the tolerances are going to be alot smaller with the new oem bearings..

Anyways back to the bearings, Since we ordered bearings from ACL.. We dont know if they were legit OEM thickness.. So we cant really plasti gauge them to see if we need any thinner ones or anything.

What I was thinking we could do, Is plasti gauge them. Get the measurement, call up the machine guy and see if he can take said measurement thickness off of the crankshaft.. Say the bearings are .030 over, We would see if he could grind .030 off the crankshaft so that the bearings would be in spec.

What do you guys say? Can we grind off of the crank and everything else still be ok? or do we have to do a whole bunch of work and find out the bearing sizes we need etc..

[MooMoos14]

Bump!