The Ford Barn

rer_239 · 06-17-2024, 02:55 PM

Should rods have forward and back movement?
Tia
Dick

nkaminar · 06-17-2024, 05:01 PM

Yes. I am not sure how much is too much. I would day up to 0.050 inch would be OK, but that is just a guess.

If the rod is bent or twisted it will bang back and forth and create a knocking noise. Otherwise it will just float in there.

Kurt in NJ · 06-17-2024, 10:05 PM

From the Ford service bulletins
0.008 - 0.012 “

nkaminar · 06-18-2024, 04:47 AM

Thank you Kurt.

Bob Bidonde · 06-18-2024, 09:51 AM

The connecting rods must have fore-aft clearance on the crankshaft pins to accommodate the end play of crankshaft. Each time you step on the clutch, the crankshaft moves on its axis.
When the crankshaft end ply becomes excessive, the connecting rods get a bending stress.

1930artdeco · 06-18-2024, 10:10 AM

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This is timely, I just checked mine and I ended up with about .012 on #2/4 and 0 on #1/3-or such a small amount as to be negligible.

Mike

Jim Brierley · 06-18-2024, 10:57 AM

You should have more to allow oil to flow thru the bearing for good cooling of the brg. You can increase it by sanding a little off the sides of the rods using a flat surface of some kind. This is not rocket science.

Dan McEachern · 06-19-2024, 01:45 AM

The Ford journal is nominally 1.625 wide. My standard for facing rod thrust is to make them 1.615. Seems to have worked well for 40 + years so.........just throwing it out there.

06-17-2024, 10:05 PM	#3
Kurt in NJ Senior Member Join Date: May 2010 Location: on the Littlefield Posts: 6,555	Re: Connecting rod play From the Ford service bulletins 0.008 - 0.012 “

06-18-2024, 04:47 AM	#4
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 5,869	Re: Connecting rod play Thank you Kurt. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

06-18-2024, 09:51 AM	#5
Bob Bidonde Senior Member Join Date: May 2010 Location: Long Island, NY Posts: 4,113	Re: Connecting rod play The connecting rods must have fore-aft clearance on the crankshaft pins to accommodate the end play of crankshaft. Each time you step on the clutch, the crankshaft moves on its axis. When the crankshaft end ply becomes excessive, the connecting rods get a bending stress. __________________ Bob Bidonde

06-18-2024, 10:10 AM	#6
1930artdeco Senior Member Join Date: May 2010 Location: Lynden, Wa Posts: 3,783	Re: Connecting rod play Sponsored Links (Register now to hide all advertisements) This is timely, I just checked mine and I ended up with about .012 on #2/4 and 0 on #1/3-or such a small amount as to be negligible. Mike __________________ 1930 TownSedan (Briggs) 1957 Country Sedan

06-18-2024, 10:57 AM	#7
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,251	Re: Connecting rod play You should have more to allow oil to flow thru the bearing for good cooling of the brg. You can increase it by sanding a little off the sides of the rods using a flat surface of some kind. This is not rocket science.

06-17-2024, 02:55 PM	#1
rer_239 Senior Member Join Date: May 2010 Location: muskegon, mi Posts: 331	Connecting rod play Should rods have forward and back movement? Tia Dick

06-17-2024, 05:01 PM	#2
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 5,869	Re: Connecting rod play Yes. I am not sure how much is too much. I would day up to 0.050 inch would be OK, but that is just a guess. If the rod is bent or twisted it will bang back and forth and create a knocking noise. Otherwise it will just float in there. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

06-19-2024, 01:45 AM	#8
Dan McEachern Senior Member Join Date: Aug 2010 Location: SF Bay Area Posts: 254	Re: Connecting rod play The Ford journal is nominally 1.625 wide. My standard for facing rod thrust is to make them 1.615. Seems to have worked well for 40 + years so.........just throwing it out there.