The Ford Barn

CA Victoria · 03-29-2015, 02:56 PM

I'm trying to work through the pros and cons of running these crank journal clearances. I have .003 on #1 & #2' and .002 on #3 with new bearings. Realizing the stated limits is .005 it is foreseen that the increased clearance will reduce my oil pressure. Not a hot engine by any means but in a pickup with lower gears. At this stage I'm temped to bite the bullet and turn the crank to improve the clearance and or look for a 4" crank.

I'm a beginner so looking for expert advice.

Thanks!
Tim

Ross F-1 · 03-29-2015, 03:37 PM

Are you measuring with mikes or using Plastigauge to get those numbers? I don't trust Plastigauge, unless it is checked at multiple locations on each journal. My engine had similar clearances and had plenty of pressure.

CA Victoria · 03-29-2015, 03:44 PM

Good point, before I bought new bearings I did prelim measurements and thought my crank was within a couple thousands.....supprised to see the .003 with plastigage .
I will recheck it.

Walt Dupont--Me. · 03-29-2015, 04:41 PM

It's a little more than necessary but if it's in a truck and not driving long trips use 20-50 oil and it will live forever. Walt

CA Victoria · 03-29-2015, 07:31 PM

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Mains measured at .002 with micrometers.

03-29-2015, 04:41 PM	#4
Walt Dupont--Me. Senior Member Join Date: May 2010 Location: Gardiner Me. Posts: 4,200	Re: 8ba crank clearance It's a little more than necessary but if it's in a truck and not driving long trips use 20-50 oil and it will live forever. Walt

03-29-2015, 07:31 PM	#5
CA Victoria Senior Member Join Date: Feb 2011 Posts: 2,216	Re: 8ba crank clearance Sponsored Links (Register now to hide all advertisements) Mains measured at .002 with micrometers. __________________ Tim Downtown, Ca

03-29-2015, 02:56 PM	#1
CA Victoria Senior Member Join Date: Feb 2011 Posts: 2,216	8ba crank clearance I'm trying to work through the pros and cons of running these crank journal clearances. I have .003 on #1 & #2' and .002 on #3 with new bearings. Realizing the stated limits is .005 it is foreseen that the increased clearance will reduce my oil pressure. Not a hot engine by any means but in a pickup with lower gears. At this stage I'm temped to bite the bullet and turn the crank to improve the clearance and or look for a 4" crank. I'm a beginner so looking for expert advice. Thanks! Tim __________________ Tim Downtown, Ca

03-29-2015, 03:37 PM	#2
Ross F-1 Senior Member Join Date: Nov 2010 Location: NM Posts: 2,443	Re: 8ba crank clearance Are you measuring with mikes or using Plastigauge to get those numbers? I don't trust Plastigauge, unless it is checked at multiple locations on each journal. My engine had similar clearances and had plenty of pressure. __________________ '52 F-1, EAB flathead

03-29-2015, 03:44 PM	#3
CA Victoria Senior Member Join Date: Feb 2011 Posts: 2,216	Re: 8ba crank clearance Good point, before I bought new bearings I did prelim measurements and thought my crank was within a couple thousands.....supprised to see the .003 with plastigage . I will recheck it. __________________ Tim Downtown, Ca Last edited by CA Victoria; 03-29-2015 at 06:05 PM.