Flywheel 239=312?
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From: Lancaster, So Carolina
Flywheel 239=312?
I am about to swap out a freshly painted bellhousing, trans from my '55 parts truck and it seems easiest to get the 239's flywheel resurfaced so I can assemble without pulling the one off the 312 and waiting while it would be resurfaced.
Anyone know if its the same part? The 312 is a '59
Thanks
Anyone know if its the same part? The 312 is a '59
Thanks
Posting Guru
Joined: Jul 2001
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From: Southern New Hampshire
Flywheel 239=312?
The 54-55 239 probably has a 10" clutch which was what came stock in trucks and cars unless they had the police/taxi package.
In the 272-312 years the 10" was stock and the 11" optional; so you will probably have to pull and check. Id want to guess the 312 has the 11".
In the 272-312 years the 10" was stock and the 11" optional; so you will probably have to pull and check. Id want to guess the 312 has the 11".
Cargo Master
Joined: Apr 2003
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Flywheel 239=312?
I believe that the same flywheel was used for the 10 and 11" clutch. The ring gear has the same number of teeth so the flywheels must be the same diameter. I would measure the surface of the 239 flywheel where the disc contacts it and make sure there is enough surface area for the 11" disc to make contact without any obstructions, holes, ridges that resurfacing will not get out, etc. I feel like it will work just fine.
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Senior User
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From: Lancaster, So Carolina
Flywheel 239=312?
Got lucky.
Flywheel from 239 was same part on the 312 (whether it was on the 312 originally I will never know)
Clutch 10"
swapped 3 sp gearbox in nice shape that had the plastic (nylon?) speedo drive gear long since munched up in the old trans. So speedo back in biz.
Smoother and quieter than ever b4- now I just hear those good Y sounds!
Flywheel from 239 was same part on the 312 (whether it was on the 312 originally I will never know)
Clutch 10"
swapped 3 sp gearbox in nice shape that had the plastic (nylon?) speedo drive gear long since munched up in the old trans. So speedo back in biz.
Smoother and quieter than ever b4- now I just hear those good Y sounds!
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From: Lancaster, So Carolina
Flywheel 239=312?
I should be accused here of talking to myself.
But I hope to save someone else the heartburn
Although that 239 flywheel 'fit', it DOES NOT have the same balance as a 312 flywheel. We had machined and balanced the 239 unit, but it still gave a mild shake at about 2500.
Another veteran Y blocker swears he ran into the same thing trying to get a 292 flywheel to work with a 312.... ie that the 312 flywheel is its own thing.
Now I gotta resurface the 312 unit and do it all over.
But I hope to save someone else the heartburn
Although that 239 flywheel 'fit', it DOES NOT have the same balance as a 312 flywheel. We had machined and balanced the 239 unit, but it still gave a mild shake at about 2500.
Another veteran Y blocker swears he ran into the same thing trying to get a 292 flywheel to work with a 312.... ie that the 312 flywheel is its own thing.
Now I gotta resurface the 312 unit and do it all over.
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Posting Guru
Joined: Jul 2001
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From: Southern New Hampshire
Flywheel 239=312?
Diggin a bit deeper it appears that Mercury used a different flywheel on all Y engines with the 57-60 312 being by itself.
I can dig deeper Monday.
I can dig deeper Monday.
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Thread Starter
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Senior User
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From: Lancaster, So Carolina
Flywheel 239=312?
Well I'm still fighting this thing. The 239 fly vibrated moderately at low rpm , smoothing out some at 2500 or so.
THe resurfaced 312 shakes now uniformly thru all the rpm. The shop that turned it of course swears they take care to keep it balanced. THis is possible because the old racer mechanic that did the job (since passed on to the track in the sky) had 'unconventional' ways of balancing engine components and all. Now we are chasing around trying to acheive balance with different weight bolts, etc. Also gonna TRY to find another one of those special 312 flywheels.
BTW the block is B9AE with the ECZ caps , which I have seen is probably a 59 Merc??
THe resurfaced 312 shakes now uniformly thru all the rpm. The shop that turned it of course swears they take care to keep it balanced. THis is possible because the old racer mechanic that did the job (since passed on to the track in the sky) had 'unconventional' ways of balancing engine components and all. Now we are chasing around trying to acheive balance with different weight bolts, etc. Also gonna TRY to find another one of those special 312 flywheels.
BTW the block is B9AE with the ECZ caps , which I have seen is probably a 59 Merc??
Cargo Master
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Flywheel 239=312?
Don't use bolts to try to balance the flywheel. Take it to a machine shop that has the ability to balance it properly. If you can't find one locally send it to one. Idealy you want to balance the whole assembly - crank, flywheel, harmonic damper, pressure plate, rods, pistons. Otherwise you are just wasting money having one or two things balanced. My block is balanced and it runs like a sewing machine and roars like a lion.
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From: Lancaster, So Carolina
Flywheel 239=312?
Ah yes, you of course are right, and that is the right way.
Put yourself in my shoes for a sec. I once had a sewing machine also- this motor is maybe 1000 miles since overhaul. Done by a man that raced Y's. Southern home grown engineering, probably a lack of all the right tools and being too cheap to send things out, there is no telling what unconventional methods added up to the balanced engine I once had
All I do is resurface the flywheel during a clutch replacement and now I gotta drop the bottom of the motor? I think I'll have to play around a bit, whether its textbook or not. Y's dont need to go 10,000 rpm around town. Bottom line, I wish it had been done right first, now I'm chasing my tail
Put yourself in my shoes for a sec. I once had a sewing machine also- this motor is maybe 1000 miles since overhaul. Done by a man that raced Y's. Southern home grown engineering, probably a lack of all the right tools and being too cheap to send things out, there is no telling what unconventional methods added up to the balanced engine I once had
All I do is resurface the flywheel during a clutch replacement and now I gotta drop the bottom of the motor? I think I'll have to play around a bit, whether its textbook or not. Y's dont need to go 10,000 rpm around town. Bottom line, I wish it had been done right first, now I'm chasing my tail
Cargo Master
Joined: Apr 2003
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Flywheel 239=312?
Well that does make it a little more difficult and time consuming. I would still try to find a shop that has a jig for balancing flywheels or just an old crank laying around that they can bolt the flywheel to for balancing. Finding the right weight bolt and position on the flywheel will be a pain in the neck. But I understand why you cannot go the other route.
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Senior User
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From: Lancaster, So Carolina
Flywheel 239=312?
Went to another shop that had a dedicated horizontal turning flywheel GRINDER instead of the local parts shop with the adapted vertical brake rotor machine.
Guess what? Grinder hit one side of that 312 flywheel alot harder, and she's in, balanced, and runs creamy smooth!
Lesson 1. Y's have no real front vibration damper and balance of crank/fly is more critical
Lesson 2. Age-old, find a shop that knows what they're doing!
Guess what? Grinder hit one side of that 312 flywheel alot harder, and she's in, balanced, and runs creamy smooth!
Lesson 1. Y's have no real front vibration damper and balance of crank/fly is more critical
Lesson 2. Age-old, find a shop that knows what they're doing!
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