The Ford Barn

Tony, NY · 12-01-2014, 12:33 PM

I just got my flywheel/pressure plate assembly, for my '51 Merc engine, balanced. On re-assembly had a hard time getting the flywheel to seat on the crank.
First question is should it go on by hand or are the pins tight fitting? A rubber mallet wouldn't work. I tried for over an hour. Went on most of the way but wouldn't seat. Had to use the bolts to draw it in the last little bit.
Second. Checked out the flywheel face run-out after it was bolted on and with PP, and it was .010. That was about an 1/8" from the outer edge. I'm thinking that may be borderline or over allowable. Any opinions on that?
BTW, the engine is out of my AV8. Only has a few running hours but had a vibration at about 1200 rpm that made me pull it. Checked it with no belts on and was the same. Pushed in the clutch pedal and was the same. Hoping that this balancing cures it.

Mac VP · 12-01-2014, 05:39 PM

Ford gave a spec of .005" maximum run-out on the flywheel. As a side note, the max allowable runout for the RING GEAR was .010". The shop manual states that after checking the flywheel runout, if it exceeds .005" be sure to remove it and remount the flywheel by 180 degrees....and check run out again. If the measurement is still above .005" the manual says to remove the flywheel and check the run out of the mounting flange. In other words, the problem could be the crankshaft mounting flange. Would be a bummer to replace the flywheel and still have a problem. Take the measurements out close to the edge (but not the actual ring gear).

The flywheel-to-crank flange bolts get torqued to 75-85 lbs. The pressure plate-to-flywheel bolts get 17-20 lbs. The manual states to align the flywheel onto the dowel pins, install and torque the bolts. It can take some wiggling and tapping with a rubber mallet to get it started. Make sure there are no burrs or other damage to the dowel pins, or the pin holes in the flywheel.

Walt Dupont--Me. · 12-01-2014, 08:13 PM

If the crank flange is true , it's poseable that the flange on the back of the wheel was not cleaned good when the wheel was resurfaced . Walt

Binx · 12-01-2014, 09:12 PM

The vibration may have sheared a step in your alignment pins.

Lonnie

Tony, NY · 12-01-2014, 09:36 PM

Thanks for all the replies. Good information.

El Rat · 12-02-2014, 06:11 PM

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You can "hang" the flywheel on threaded studs. Studs long enough to let you position the FW without fear of dropping it on your tootsies! That thing does not need .010 runout. Take it off clean both surfaces and try again.

George/Maine · 12-02-2014, 06:43 PM

Does yours look like this ,rust is ok for sale $75.00

Tony, NY · 12-02-2014, 08:28 PM

I removed the flywheel again and examined the back side more closely. The bolt holes edges felt like they were higher than the surface so I deburred them. Also cleaned crank and flywheel with a surface conditioning disc. Put the FW back on 180* from before. Checked runout and it was .004. Looks like things are good now.
Yes, George/Maine, looks the same minus the rust/oil.
Thanks again.

Tony, NY · 12-29-2014, 06:15 AM

Just a follow-up. Reinstalled the engine and fired it up. No more vibration. So, don't think the worst if you have a engine related vibration. This problem should have never happened on a new build, but it did. Now, to tackle the next thing...

Mart · 12-29-2014, 10:30 AM

Result!

Well done.

Mart.

Ol' Ron · 12-29-2014, 04:32 PM

A ford head stud is the same thread as the flywheel and also makes for a nice handle when installing the crank. Now which end do you uz??

Pepetrolo · 05-04-2015, 11:31 AM

Hello, I was just wondering if I can ask a question about a flywheel that I had stored for a decade or so, Part Number B4AZ-6376(or 5)-B I bought it for my 1960 F100 1/2 ton and the clutch pressure plate is bigger (about 1 inch in Diameter) I believe it is for a 54 something, Can I just buy the bigger clutch and still us it, or should I just try to sell it, It is a Brand new in the Original Ford Box, Please, Thank You to anyone willing to help,. I'm willing to sell it for less of what I bought it,.

Bob C · 05-04-2015, 11:40 AM

B4AZ-6375-B Flywheel and Ring Gear Assembly 11" clutch 6 cylinder 223, 262 1954-64

Bob

Pepetrolo · 05-05-2015, 10:48 AM

Thank You Bob for Replying, I will buy the correct parts for the flywheel, It is a Lot of Help,. Thanks Again,. Have a Great Day,.

12-01-2014, 12:33 PM	#1
Tony, NY Senior Member Join Date: May 2010 Location: Capital of Corruption , NY Posts: 811	Flywheel Questions I just got my flywheel/pressure plate assembly, for my '51 Merc engine, balanced. On re-assembly had a hard time getting the flywheel to seat on the crank. First question is should it go on by hand or are the pins tight fitting? A rubber mallet wouldn't work. I tried for over an hour. Went on most of the way but wouldn't seat. Had to use the bolts to draw it in the last little bit. Second. Checked out the flywheel face run-out after it was bolted on and with PP, and it was .010. That was about an 1/8" from the outer edge. I'm thinking that may be borderline or over allowable. Any opinions on that? BTW, the engine is out of my AV8. Only has a few running hours but had a vibration at about 1200 rpm that made me pull it. Checked it with no belts on and was the same. Pushed in the clutch pedal and was the same. Hoping that this balancing cures it.

12-01-2014, 05:39 PM	#2
Mac VP Senior Member Join Date: May 2010 Location: Cincinnati, OH Posts: 1,361	Re: Flywheel Questions Ford gave a spec of .005" maximum run-out on the flywheel. As a side note, the max allowable runout for the RING GEAR was .010". The shop manual states that after checking the flywheel runout, if it exceeds .005" be sure to remove it and remount the flywheel by 180 degrees....and check run out again. If the measurement is still above .005" the manual says to remove the flywheel and check the run out of the mounting flange. In other words, the problem could be the crankshaft mounting flange. Would be a bummer to replace the flywheel and still have a problem. Take the measurements out close to the edge (but not the actual ring gear). The flywheel-to-crank flange bolts get torqued to 75-85 lbs. The pressure plate-to-flywheel bolts get 17-20 lbs. The manual states to align the flywheel onto the dowel pins, install and torque the bolts. It can take some wiggling and tapping with a rubber mallet to get it started. Make sure there are no burrs or other damage to the dowel pins, or the pin holes in the flywheel. __________________ VANPELT SALES LLC Cincinnati, Ohio Office: 513-724-9486 www.vanpeltsales.com www.classictransmission.com Last edited by Mac VP; 12-01-2014 at 05:43 PM. Reason: additional info

12-01-2014, 08:13 PM	#3
Walt Dupont--Me. Senior Member Join Date: May 2010 Location: Gardiner Me. Posts: 4,200	Re: Flywheel Questions If the crank flange is true , it's poseable that the flange on the back of the wheel was not cleaned good when the wheel was resurfaced . Walt

12-01-2014, 09:12 PM	#4
Binx Senior Member Join Date: Oct 2011 Location: Gloucester VA Posts: 1,042	Re: Flywheel Questions The vibration may have sheared a step in your alignment pins. Lonnie

12-01-2014, 09:36 PM	#5
Tony, NY Senior Member Join Date: May 2010 Location: Capital of Corruption , NY Posts: 811	Re: Flywheel Questions Thanks for all the replies. Good information.

12-02-2014, 06:11 PM	#6
El Rat Senior Member Join Date: Nov 2010 Posts: 260	Re: Flywheel Questions Sponsored Links (Register now to hide all advertisements) You can "hang" the flywheel on threaded studs. Studs long enough to let you position the FW without fear of dropping it on your tootsies! That thing does not need .010 runout. Take it off clean both surfaces and try again.

12-02-2014, 06:43 PM	#7
George/Maine Senior Member Join Date: May 2010 Location: Mid coast Maine Posts: 1,878	Re: Flywheel Questions Does yours look like this ,rust is ok for sale $75.00

12-02-2014, 08:28 PM	#8
Tony, NY Senior Member Join Date: May 2010 Location: Capital of Corruption , NY Posts: 811	Re: Flywheel Questions I removed the flywheel again and examined the back side more closely. The bolt holes edges felt like they were higher than the surface so I deburred them. Also cleaned crank and flywheel with a surface conditioning disc. Put the FW back on 180* from before. Checked runout and it was .004. Looks like things are good now. Yes, George/Maine, looks the same minus the rust/oil. Thanks again.

12-29-2014, 06:15 AM	#9
Tony, NY Senior Member Join Date: May 2010 Location: Capital of Corruption , NY Posts: 811	Re: Flywheel Questions Just a follow-up. Reinstalled the engine and fired it up. No more vibration. So, don't think the worst if you have a engine related vibration. This problem should have never happened on a new build, but it did. Now, to tackle the next thing...

12-29-2014, 10:30 AM	#10
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 8,752	Re: Flywheel Questions Result! Well done. Mart.

12-29-2014, 04:32 PM	#11
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Flywheel Questions A ford head stud is the same thread as the flywheel and also makes for a nice handle when installing the crank. Now which end do you uz??

05-04-2015, 11:31 AM	#12
Pepetrolo Junior Member Join Date: May 2015 Posts: 3	Re: Flywheel Questions Hello, I was just wondering if I can ask a question about a flywheel that I had stored for a decade or so, Part Number B4AZ-6376(or 5)-B I bought it for my 1960 F100 1/2 ton and the clutch pressure plate is bigger (about 1 inch in Diameter) I believe it is for a 54 something, Can I just buy the bigger clutch and still us it, or should I just try to sell it, It is a Brand new in the Original Ford Box, Please, Thank You to anyone willing to help,. I'm willing to sell it for less of what I bought it,.

05-04-2015, 11:40 AM	#13
Bob C Senior Member Join Date: May 2010 Location: So Cal Posts: 8,751	Re: Flywheel Questions B4AZ-6375-B Flywheel and Ring Gear Assembly 11" clutch 6 cylinder 223, 262 1954-64 Bob

05-05-2015, 10:48 AM	#14
Pepetrolo Junior Member Join Date: May 2015 Posts: 3	Re: Flywheel Questions Thank You Bob for Replying, I will buy the correct parts for the flywheel, It is a Lot of Help,. Thanks Again,. Have a Great Day,.