The Ford Barn

onthehunt · 03-08-2024, 11:02 AM

Hi All,
I'm going through a few boxes of flathead bearings and found several with odd dimensions.

For example, I've got a set labeled "ICM-6333-A Red .0852-.0855 and Blue .0855-.0858"

Can anyone explain the color/sizing? I've never run across these before and am not finding anything in my books.

flatjack9 · 03-08-2024, 11:48 AM

Std bearing thickness is .0852, so these could be used on a slightly undersized journal

onthehunt · 03-08-2024, 11:51 AM

Ahh, thanks! I wasn't considering the shell thickness. Were odd journal sizes really that common? I've come across piles of bearings over the years but never the reds and blues.

Bob C · 03-08-2024, 12:15 PM

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This is from 1949-53 Mercury parts book.
1CM-6333-B (Red Size) crankshaft dia 2.498"/ 2.499 (Std)
Block main Bearing Bore 2.675"/2.671" (Std) Overall Length
1.49"/1.506" (Std)
It shows the same dimensions for 1CM-6333-C (Blue Size)

03-08-2024, 11:02 AM	#1
onthehunt Junior Member Join Date: May 2011 Location: NR, Ohio Posts: 19	Flathead bearings - red/blue sizes? Hi All, I'm going through a few boxes of flathead bearings and found several with odd dimensions. For example, I've got a set labeled "ICM-6333-A Red .0852-.0855 and Blue .0855-.0858" Can anyone explain the color/sizing? I've never run across these before and am not finding anything in my books.

03-08-2024, 11:48 AM	#2
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,527	Re: Flathead bearings - red/blue sizes? Std bearing thickness is .0852, so these could be used on a slightly undersized journal

03-08-2024, 11:51 AM	#3
onthehunt Junior Member Join Date: May 2011 Location: NR, Ohio Posts: 19	Re: Flathead bearings - red/blue sizes? Ahh, thanks! I wasn't considering the shell thickness. Were odd journal sizes really that common? I've come across piles of bearings over the years but never the reds and blues.

03-08-2024, 12:15 PM	#4
Bob C Senior Member Join Date: May 2010 Location: So Cal Posts: 8,755	Re: Flathead bearings - red/blue sizes? Sponsored Links (Register now to hide all advertisements) This is from 1949-53 Mercury parts book. 1CM-6333-B (Red Size) crankshaft dia 2.498"/ 2.499 (Std) Block main Bearing Bore 2.675"/2.671" (Std) Overall Length 1.49"/1.506" (Std) It shows the same dimensions for 1CM-6333-C (Blue Size)