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09-21-2018, 10:46 AM | #1 |
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Crankshaft Question
I am currently building an 8BA out of a '53 Customline.
(Side Note: I have posted a Want Ad for a stock camshaft to be used as a core for regrind.) I purchased this 4" Merc Crank from a guy last year. I was in the process of moving and the 8BA build was on hold for the time. So, I never really took time to unbox the crank when it arrived. I had a good conversation with the gentleman I purchased it from, and he seemed to be very trustworthy. The story was that it had been to the rebuild shop and was cut to .010/.010. Well, the 8BA build is starting to progress again so I am gathering parts. I decided to take a look at the crank this morning. I am not sure what takes place during the rebuild of a crankshaft. There were some things that looked a little concerning to me, however. So, I wanted to post these pics and get your input as to the overall condition and looks of the crankshaft. Any feedback you have would be appreciated. Thanks in advance.
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09-21-2018, 10:59 AM | #2 |
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Re: Crankshaft Question
What are the questions, the casting flaws? Looks like a fairly normal flathead crankshaft. The holes are how they are balanced.
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09-21-2018, 11:03 AM | #3 |
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Re: Crankshaft Question
I guess the casting flaws were the main concern. I appreciate the input.
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09-21-2018, 11:18 AM | #4 |
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Re: Crankshaft Question
make sure to clean out the oil gallerys and install plugs after. that large piece missing would have me concerned wether the crank can be balanced.
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09-21-2018, 11:27 AM | #5 |
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Re: Crankshaft Question
The chuck missing is from the factory. The cranks were cast in groups of four (I think it's 4) and then busted apart. It is common to see the parting flaws. If it would not balance properly it would not have left the Ford factory.
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09-21-2018, 11:28 AM | #6 |
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Re: Crankshaft Question
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09-21-2018, 11:34 AM | #7 |
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Re: Crankshaft Question
I have one with 3/8 plug holes but the wide counter weights and 4” stroke. You need to measure the stroke to make sure. I agree the casting flaws aren’t a bad thing..... Mark
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09-21-2018, 11:40 AM | #8 |
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Re: Crankshaft Question
I read that the measurement across the thick throw on a Mercury crankshaft should be about 6". As opposed to the Ford crankshaft which is about 5 1/2". My crank measures about 6".
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09-21-2018, 11:49 AM | #9 |
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Re: Crankshaft Question
The middle picture in the bottom row concerns me. It looks like an open, or porous, fracture in the side of the casting, and maybe a crack half way through the top flat part. Also, maybe it is the picture, but it looks like a step where the radius should be.
At any rate, your machinist should be able to make determination about its condition. You say you are looking for another crank, have you determined it is bad? |
09-21-2018, 11:58 AM | #10 |
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Re: Crankshaft Question
Actually, I am looking for a stock camshaft to be reground.
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09-21-2018, 12:17 PM | #11 |
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Re: Crankshaft Question
I agree with "40cpe". I got carried away looking at the big rough area and missed the one he mentioned.
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09-21-2018, 02:52 PM | #12 |
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Re: Crankshaft Question
Again, this passed Ford quality inspection, it is not something that would be difficult to see. But I agree, it is not pretty!
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09-21-2018, 03:35 PM | #13 |
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Re: Crankshaft Question
A lot of years and miles (not to mention at least one regrind) from the time it left the factory. A lot could have happened in the interim period.
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09-21-2018, 04:25 PM | #14 |
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Re: Crankshaft Question
Nothing to get excited about - standard Ford stuff.
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09-21-2018, 07:20 PM | #15 |
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Re: Crankshaft Question
The Canadian 4" crank has 3/8 clean out holes in some of their cranks, With out the natching rods you;ll have to have the assy balanced. I always keep the rods with the crank, the factory balance is hard to improve on. Piston weight is not that important for a street engine
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09-22-2018, 05:42 PM | #16 |
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Re: Crankshaft Question
Looks like all the Merc cranks I've seen
The bearing journals look pretty good. If it has a 6" wide big throw it's a Merc for sure. |
09-23-2018, 01:33 PM | #17 |
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Re: Crankshaft Question
Cranks were cast in multiples so the were connected by sprues for transfere of molten metal throughout the mold. After the castings were removed from the mold, they were broken away from the sprues and likely set in a shaker box to break away the mold cores. The one spot on there is a surface inclusion that was determined to not be structurally deficient by Ford. I imagine that the crank was run for many miles like that already.
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10-15-2018, 11:22 AM | #18 |
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Re: Crankshaft Question
Is anyone aware of a shop in the Dallas / Fort Worth area that I can take this crankshaft to and have it completely checked out before putting into my 8BA?
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10-15-2018, 02:40 PM | #19 |
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Re: Crankshaft Question
Please disregard the above question. I found a place about 20 minutes from me.
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10-18-2018, 03:35 PM | #20 |
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Re: Crankshaft Question
.
As I understand, those cranks were cast in pairs and had to be broken apart, resulting in each having a rough area. A new pristine Scat crank can cost $1300 and does NOT have nasty cast marks. |
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