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Old 01-26-2014, 05:04 PM   #1
smoky
Scooby Newbie
 
Member#: 221439
Join Date: Aug 2009
Chapter/Region: E. Canada
Location: Quebec, Canada
Vehicle:
2004 STI
Blue

Default First time measuring clearance with Mic/Bore, need opinion on result

Looking for advice/critic on my results.

Quick story, I did about 10 round of practice on my old block/crank before taking those. I was able to get to a max variance of 0.0002 while practicing on my old block. I'm using a 2-3' fowler Mic and fowler Bore Gauge.

Method I found to work the best so far:
1) Measure all crank mains
2) Measure again the main #1 and lock the mic (make sure you get the same measure than 1)
3) Zero the bore gauge on the mic
4) Measure all mains
5) Once done recheck your bore gauge on the mic to make sure it's still at 0

Results I got with
- Used 2008 block
- Brand new crank (BBBCC and ZZII)
- Manley + ACL race STD rod bearing
- King XPG main bearing

Mains (took measure twice):
1) -0.0003/-0.0005 (main #1 was smaller by around 0.001 without bearing, so seems normal)
2) 0.0010 / 0.0010
3) 0.0006 / 0.0007
4) 0.0014 / 0.0014
5) 0.0017 / 0.0019

Rods:
1) 0.8
2) 0.9
3) 0.7
4) 0.7/0.6

Will need more bearing to get the result I want.

If you see anything that would sound like I ****ed up my measurement please advice.
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Old 01-26-2014, 05:06 PM   #2
smoky
Scooby Newbie
 
Member#: 221439
Join Date: Aug 2009
Chapter/Region: E. Canada
Location: Quebec, Canada
Vehicle:
2004 STI
Blue

Default

Forget to give the crank measure:
Mains
1) 2.3619
2) 2.3619
3) 2.3619
4) 2.3617
5) 2.3617

Rods:
1) 2.0466
2) 2.0467
3) 2.0468
4) 2.0468
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Old 01-26-2014, 05:28 PM   #3
Serkan
Scooby Specialist
 
Member#: 180514
Join Date: May 2008
Chapter/Region: E. Canada
Location: Windsor
Vehicle:
2004 Sti White

Default

I don't think you are doing it right.

How do you get minus clearance for #1 main. You are saying crank journal is larger than block journal with bearing in it.

Put the block halves together with the main bearings and crankshaft in it (apply a little assembly lube on the journals). If you indeed have no clearance the crank will not turn.

Edit: Are you torquing the block halves together properly. You better be following the FSM for this stuff.

Last edited by Serkan; 01-26-2014 at 05:34 PM.
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Old 01-26-2014, 07:09 PM   #4
Barney145
Scooby Newbie
 
Member#: 376219
Join Date: Dec 2013
Location: southern Virginia
Vehicle:
1977 5.4L MGB

Default

Anytime you are going to measure main clearances you need to measure the block first. It can be out of spec and give you problems trying to get accurate bearing clearance measurements. Torque the cases together without bearings, set your bore gage to 2.520" and measure all the housing bores. It does sound like your #1 main is out of whack if you have no clearance. If you want the clearances to come out as consistent as your crank measurements, you'll need a line bore.
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Old 01-26-2014, 07:38 PM   #5
smoky
Scooby Newbie
 
Member#: 221439
Join Date: Aug 2009
Chapter/Region: E. Canada
Location: Quebec, Canada
Vehicle:
2004 STI
Blue

Default

Just to confirm, I'm using the FSM to torque the block together.

I did measure the block with not bearing and the #1 was actually 0.001 smaller than all the other one.

Also confirming that #1 is actually smaller than the crank

A line bore might be a good idea, on the other side with a set of +0.001 clearance I would be almost where I want.

Good points Serkan about trying the assembly to see if it turns, would be a good way to double check I'm doing it properly.

Tx for the advice, still thinking about what's next.
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