The Ford Barn

Stoker280 · 12-11-2020, 05:05 AM

I am restoring a 1953 M250 classic (basically a 53 F250) with a 239 flat head and 4 speed transmission. I have the opportunity to get some hardware from a work site that is being closed. I was wondering if anyone knew the size and thread pitch of the clutch pressure plate bolts and the engine/transmission bell housing mounting bolts. Any of the hardware sizes would be great and I could take the opportunity to get some new fasteners.

Mart · 12-11-2020, 05:35 AM

Get them all.

The pressure plate bolts are 5/16 UNC (if the same as the earlier ones) and are about 1" long with a portion of plain shank. The thread is short it is not a standard bolt but you can shorten some longer ones.

I don't know about the bellhousing bolts but if the same as the earlier ones they are 3/8 UNC by about 1".

But seriously if they are going begging, get them all. You never know what you are going to need in the future.

Mart.

51 MERC-CT · 12-11-2020, 06:15 AM

Bell housing to engine bolts with cast housing are 7/16-14 x 1-1/4"

With pressed steel housing 7/16-14 x 1"

The pressure plate bolts are special 3/8-16 x 3/4" with appox. 5/16" that is not threaded.

PeteVS · 12-11-2020, 08:51 AM

For flywheel and / or pressure plate bolts, I'd recommend getting a set from ARP from any of the big speed parts vendors. They'll be the right size, proper shank diameter and "tougher than nails."

G.M. · 12-11-2020, 09:20 AM

The non threaded area is for alighnment. G.M.

Ol' Ron · 12-11-2020, 08:00 PM

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Be carful with the pressure plat bolts. A friend of mine ordered some and they were WRONG!! these bolts should have a shoulder on them that match the flywheel. Sometimes you get the wrong part???

GB SISSON · 12-11-2020, 08:06 PM

That shoulder is very important.... And it could be same diameter as the unthreaded area of a regular bolt. But in a HD truck like an F250 in granny gear with a load, and dump the clutch heading uphill, think of the shear on those 6 rather small bolts!

PeteVS · 12-12-2020, 07:10 AM

Quote:

Originally Posted by GB SISSON

Think of the shear on those 6 rather small bolts!

Not too bad on the pressure plate bolts due to the large diameter of the bolt circle but the flywheel bolts see a lot of shear! And, half of the torque being applied to the clutch disc is coming from the flywheel direct, only the other half from the pressure plate.

12-11-2020, 05:05 AM	#1
Stoker280 Junior Member Join Date: Jun 2020 Posts: 27	Bolt sizes for pressure plate and bell housing I am restoring a 1953 M250 classic (basically a 53 F250) with a 239 flat head and 4 speed transmission. I have the opportunity to get some hardware from a work site that is being closed. I was wondering if anyone knew the size and thread pitch of the clutch pressure plate bolts and the engine/transmission bell housing mounting bolts. Any of the hardware sizes would be great and I could take the opportunity to get some new fasteners.

12-11-2020, 05:35 AM	#2
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 9,239	Re: Bolt sizes for pressure plate and bell housing Get them all. The pressure plate bolts are 5/16 UNC (if the same as the earlier ones) and are about 1" long with a portion of plain shank. The thread is short it is not a standard bolt but you can shorten some longer ones. I don't know about the bellhousing bolts but if the same as the earlier ones they are 3/8 UNC by about 1". But seriously if they are going begging, get them all. You never know what you are going to need in the future. Mart.

12-11-2020, 06:15 AM	#3
51 MERC-CT Senior Member Join Date: May 2010 Location: East Hartford, Ct Posts: 5,898	Re: Bolt sizes for pressure plate and bell housing Bell housing to engine bolts with cast housing are 7/16-14 x 1-1/4" With pressed steel housing 7/16-14 x 1" The pressure plate bolts are special 3/8-16 x 3/4" with appox. 5/16" that is not threaded. __________________ DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES Last edited by 51 MERC-CT; 12-11-2020 at 06:39 AM.

12-11-2020, 08:51 AM	#4
PeteVS Senior Member Join Date: May 2010 Location: FP, NJ Posts: 2,828	Re: Bolt sizes for pressure plate and bell housing For flywheel and / or pressure plate bolts, I'd recommend getting a set from ARP from any of the big speed parts vendors. They'll be the right size, proper shank diameter and "tougher than nails." __________________ Don't never get rid of nuthin!

12-11-2020, 09:20 AM	#5
G.M. Senior Member Join Date: May 2010 Location: Florida and Penna. Posts: 4,471	Re: Bolt sizes for pressure plate and bell housing The non threaded area is for alighnment. G.M. __________________ www.fordcollector.com

12-11-2020, 08:00 PM	#6
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,985	Re: Bolt sizes for pressure plate and bell housing Sponsored Links (Register now to hide all advertisements) Be carful with the pressure plat bolts. A friend of mine ordered some and they were WRONG!! these bolts should have a shoulder on them that match the flywheel. Sometimes you get the wrong part???