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01-31-2024, 01:38 PM | #1 |
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When did Ford change from crankshaft slingers to seals?
Hi,
38_couupe and I are asking for help in identifying when Ford changes from front and rear crankshaft oil slingers to rope seals? I'd like to add a row to the chart below, adding this detail. this question was raised in this recent thread. "Both of my 41s ( very early 3 piece fender ) have slingers and no rope seal . I also thought that the rope seal started in 42 . Memory gets slim in the later part of the day . Maybe its the coffee that wakes up mu memory? As far as the work you want to do , some questions . How old are you ? Are you capable of doing the work yourself ? Are there known good flathead mechanics and machine shops around you ? Are you aware of the difference between a slinger and a rope seal ? Check out what a slinger is if you didn’t. Good luck, Gary" (Ggmac)
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Archives of historical but relevant older articles: ------------- Hover mouse over the links below and click! ~~~~~~~~~~~~~~~~~--------------- Rumble Seat's Notes Techno-Source for the 1932 thru 1953 Flathead Ford |
01-31-2024, 02:37 PM | #2 |
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Re: When did Ford change from crankshaft slingers to seals?
Starting in 1939 with the 91A-6303-B and the 99A-6303-B crankshafts for big trucks and buses. The 6303-A crankshafts have the slinger on the rear used in the passenger car.
Last edited by Ken/Alabama; 01-31-2024 at 06:40 PM. |
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01-31-2024, 04:48 PM | #3 |
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Re: When did Ford change from crankshaft slingers to seals?
Joe Abbin , Ford and Mercury flathead v-8 identification abd rebuilders guide , page2-10
“ Sometime in 1941 , the slinger ( labyrinth) type rear main bearing oil seal ( used previously) was replacedby a rope seal on engines for commercial ( bus , truck ) applications. The rope type seal and associated parts became standard for all applications after the war . “ |
01-31-2024, 05:56 PM | #4 |
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Re: When did Ford change from crankshaft slingers to seals?
There is an easy way to tell if you have the slinger especially if its time for an oil change . Make sure your oil is at the full mark and on level ground . Add 3 1/2 to 4 1/2 qts of old oil and see if it streams out the back . Do not start it with this much oil in it . Drain oil .
I did this with a used motor I was going to buy , the seller said the 221 with bottom welch plug bumps , said the crank was machined and a rope seal was installed . Motor was supposed to only have 5,000 miles since rebuild. Well I didn’t buy it , oil poured out the back . I’m of the nature that if you lie to me about one thing , how much more is bs ? A friend later bought the motor and was given the same story , long story but it still had the slinger and wasn’t rebuilt with only 5,000 miles on it . Maybe 30,000 . Major ridge and pistons at 040 . |
02-01-2024, 06:50 AM | #5 |
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Re: When did Ford change from crankshaft slingers to seals?
I'll expand the question a bit. Let's make a list of all the crankshafts that fit the 221-239-255 flathead V8s. Off the top of my head I can think of:
I can't remember if the crankshaft ends were changed for 1951 when the automatic transmissions came out. What am I missing from the list? |
02-01-2024, 08:40 AM | #6 |
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Re: When did Ford change from crankshaft slingers to seals?
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Glenn
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Archives of historical but relevant older articles: ------------- Hover mouse over the links below and click! ~~~~~~~~~~~~~~~~~--------------- Rumble Seat's Notes Techno-Source for the 1932 thru 1953 Flathead Ford |
02-01-2024, 08:53 AM | #7 |
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Re: When did Ford change from crankshaft slingers to seals?
There are at least two different flywheel flanges for the later 51 - 53 crankshafts - one takes a throw-out bearing (like the 32 - 48 cranks), the other is for an automatic transmission (much smaller pilot hole).
I've not screwed with the automatic version, I'm sure they can be "retrofitted" for a clutch setup with a bit of work. Anybody know the deal on these? |
02-01-2024, 11:30 AM | #8 |
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Re: When did Ford change from crankshaft slingers to seals?
You can never rule out previous rebuilds where older parts are fitted into newer blocks or vice versa. I was surprised to see a slinger crank in a 59 block for instance. It may have been correct, I don't know.
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02-01-2024, 01:28 PM | #9 |
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Re: When did Ford change from crankshaft slingers to seals?
Same here. My 59A had a slinger that I became aware of when I tilted the motor during removal and oil poured out the back. Surprise! I had thought it would be easier to drain the crankcase once it was out of the truck.
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02-04-2024, 11:46 AM | #10 |
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Re: When did Ford change from crankshaft slingers to seals?
Thanks for everyone's comments!
I put together a document based on comments here and internet searches. I also added it to the Techno-Source link, page #61, in my signature below. Glenn
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Archives of historical but relevant older articles: ------------- Hover mouse over the links below and click! ~~~~~~~~~~~~~~~~~--------------- Rumble Seat's Notes Techno-Source for the 1932 thru 1953 Flathead Ford |
02-05-2024, 02:01 PM | #11 |
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Re: When did Ford change from crankshaft slingers to seals?
Thanks Glen - UR the best!
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02-05-2024, 03:38 PM | #12 |
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Re: When did Ford change from crankshaft slingers to seals?
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Archives of historical but relevant older articles: ------------- Hover mouse over the links below and click! ~~~~~~~~~~~~~~~~~--------------- Rumble Seat's Notes Techno-Source for the 1932 thru 1953 Flathead Ford |
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