The Ford Barn

marcshall · 10-05-2012, 01:02 PM

i took my BB crankshaft to the auto machine shop, they say that they cannot grind it with the wieghts over lapping the rod jouranls . looking for information about taking the wieghts off and on a BB crankshaft so it can be ground. thanks john

Charlie Stephens · 10-05-2012, 01:37 PM

Take it to a shop that specializes in the old Fords. If you posted your general location and/or included it in your profile someone might have suggestions for a shop.

Charlie Stephens

Pete · 10-05-2012, 01:42 PM

Drill the pins out and then bump the weights off with a lead hammer.
We used to do a lot of them when we had a crank grinder.
We used to put the weights back on with screws so it was easier to do the next time.

southfork · 10-06-2012, 12:01 AM

I thought that I read somewhere that some of those B cranks with pinned-on weights were "for industrial use only" and would not stand up to the high-revs that they would get in a car/pickup. if that is true, how do you know what B crankshafts with pinned on weights are OK to use?

Tom Wesenberg · 10-06-2012, 03:45 AM

The pinned on weights have a full circle, so they are plenty safe for your car.

Pete · 10-06-2012, 11:34 AM

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Quote:

Originally Posted by Tom Wesenberg

The pinned on weights have a full circle, so they are plenty safe for your car.

Roger on that..
Here is a pic of the bottom end of my last engine.
It turned 6100 twice a lap for 2 seasons and then was sold and put in a vintage dragster and won the Antique Nationals 2 years in a row.

Flathead · 10-06-2012, 02:52 PM

That is a thing of beauty!!

Jim Brierley · 10-07-2012, 02:25 PM

A welder friend of mine welds a stick to the pins and pulls them out. He then knocks the weights over just far enough to clear the grinding wheel. He then knocks them back in place and has the mains ground (or vice-versa?) I have seen those weights come off of race engines but are fine for normal use. An engine builder in Texas says that he has never seen a BB crank with a crack in it.

Kohnke Rebabbitting · 10-07-2012, 04:01 PM

We shrink ours weights on, they would never need the pins to hold them, but we put them in any way.

Herm.

marcshall · 10-08-2012, 10:24 AM

how did you shrink the weights on . at one time did they have offset stones to grind these crankshafts . when was the bb crankshaft introduced , were they for industurial use . john

just plain bill · 10-08-2012, 08:03 PM

Maybe this might help understand

Kohnke Rebabbitting · 10-08-2012, 10:44 PM

Quote:

Originally Posted by marcshall

how did you shrink the weights on . at one time did they have offset stones to grind these crankshafts . when was the bb crankshaft introduced , were they for industurial use . john

We do them the way Ford did, they are shrunk on, like a ring gear!

The off set stones, and Machine that I seen, was made by Sunnen, and was made for a single rod pin, and also they came out with the longer stone on one side.

Herm.

just plain bill · 10-09-2012, 10:37 AM

Quote:

Originally Posted by Kohnke Rebabbitting

We do them the way Ford did, they are shrunk on, like a ring gear!

The off set stones, and Machine that I seen, was made by Sunnen, and was made for a single rod pin, and also they came out with the longer stone on one side.

Herm.

Sure like to see a picture of that !

10-05-2012, 01:02 PM	#1
marcshall Member Join Date: May 2010 Location: duncan BC canada Posts: 63	BB crankshaft i took my BB crankshaft to the auto machine shop, they say that they cannot grind it with the wieghts over lapping the rod jouranls . looking for information about taking the wieghts off and on a BB crankshaft so it can be ground. thanks john

10-05-2012, 01:37 PM	#2
Charlie Stephens Senior Member Join Date: May 2010 Location: Southern California Posts: 7,032	Re: BB crankshaft Take it to a shop that specializes in the old Fords. If you posted your general location and/or included it in your profile someone might have suggestions for a shop. Charlie Stephens Last edited by Charlie Stephens; 10-07-2012 at 05:17 AM.

10-05-2012, 01:42 PM	#3
Pete Senior Member Join Date: May 2010 Location: Wa. Posts: 5,408	Re: BB crankshaft Drill the pins out and then bump the weights off with a lead hammer. We used to do a lot of them when we had a crank grinder. We used to put the weights back on with screws so it was easier to do the next time.

10-06-2012, 12:01 AM	#4
southfork Senior Member Join Date: May 2010 Location: Idaho Posts: 416	Re: BB crankshaft I thought that I read somewhere that some of those B cranks with pinned-on weights were "for industrial use only" and would not stand up to the high-revs that they would get in a car/pickup. if that is true, how do you know what B crankshafts with pinned on weights are OK to use?

10-06-2012, 03:45 AM	#5
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: BB crankshaft The pinned on weights have a full circle, so they are plenty safe for your car.

10-06-2012, 02:52 PM	#7
Flathead Senior Member Join Date: May 2010 Location: Southern Maine Posts: 1,498	Re: BB crankshaft That is a thing of beauty!!

10-07-2012, 02:25 PM	#8
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,088	Re: BB crankshaft A welder friend of mine welds a stick to the pins and pulls them out. He then knocks the weights over just far enough to clear the grinding wheel. He then knocks them back in place and has the mains ground (or vice-versa?) I have seen those weights come off of race engines but are fine for normal use. An engine builder in Texas says that he has never seen a BB crank with a crack in it.

10-08-2012, 10:24 AM	#10
marcshall Member Join Date: May 2010 Location: duncan BC canada Posts: 63	Re: BB crankshaft how did you shrink the weights on . at one time did they have offset stones to grind these crankshafts . when was the bb crankshaft introduced , were they for industurial use . john