Main bearing clearance NA block

[reses]

I'm putting together a NA block with TT pistons, looking to do a stock 9b TT conversion with NA block (yeah, no extra squirters, no cap stays), looking at the Engine Manual, the standard values: 0.0008 - 0.0020 (0.02 - 0.05mm), I'm getting about 0.0015 at the mains, according to plastigauge, I've read multiple times that is better to aim for 0.0025-0.0030, I'm using ACL Main bearings and King Rod Bearings, crank was polished and turned down to 0.010 undersize, this is a good value (0.0015), considering that I will turbo the engine?

Also, does it matter if I torque the cap down without setting the thrust first? I'm just checking the clearance before fighting with the thrust washers..

:eek-new:

http://i.imgur.com/OkfPGB9.jpg?1

[Chris@Rvengeperformance]

3 thou is old school thinking, your clearance is better.

[reses]

Actually, I got confused about the torque specs (saw the 93+ torque, but that was for the 4 bolt), the 2 bolts have 67 ft.lbs, I was doing 54 ft.lbs, checked again, its just about 0.001-0.0015 at the mains, then I got another problem, after cleaning the plastigauge and putting assembly lube, the crank binds, girdle was aligned correctly, thrust setting in spec....

I followed the service manual sequence and used 3 steps when torquing the mains, the last 2 bolts (front most 7-8) were binding the crank past 50 ft.lb, checked again the clearance in that one, its still good, I tried with a different sequence, leaving the rear most bolts last (5-6 from sequence) and now it turns easily by hand, something wrong here..?

[KeithMac]

Crank's bent?, very unlikely though as you've just had it turned.

[Chris@Rvengeperformance]

make sure the thrusts and all the bearings are installed correctly and you don't have one backwards.

[reses]

Checked that before, grooved side down, flats on the girdle, same with the thrusts, grooves out (manual illustration got those backwards), I'm sending the crank to another machine shop, also I think that the bearings got trashed from lots of plastigauging and turning..

[reses]

Well, it was the main journal, it was about 1 thou on the tight side, shortblock is done, ring gaps checked, crank endplay is good, rod clearance good, now its hard to turn but thats my new rings :D

[reses]

The car in this post is still running good, I got 16-19psi @ hot idle, sometimes after a hard run, it gets down to 12psi, low pressure light never blinkend.

Thing is..
Got another car for a rebuild, 93 3000gt with a spun bearing, the crank was turned down to 20/30 and was straight (rods are trashed), mine didn't spun a bearing so I didn't try to drill the oil galley plugs, just a thorough cleaning with solvent and compressed air, now.. I can't find any shop that would touch the crank balls so I can't clean the sludge traps, I've seen the importance to do that on cranks with spun bearings, that means that unless I remove the galleys crank is junk?

[murphys_law]

Remove them and clean it, then insert set screws.


http://youtu.be/nXzYoQFpm5c


Sent from my iPhone 6s+ using Tapatalk

[reses]

No one wants to touch those galley plugs, actually I got that video on my phone when I asked about the drilling.