Is it the Right Flywheel?
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Junior User
Joined: Dec 1999
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From: Hubbard USA
Is it the Right Flywheel?
After completing a engine swap (from 302 to 351w), there was a noticible engine vibration.
My mechanic thinks the Remanufactured Flywheel I bought might not be balanced properly. (The 351w came out of an automatic).
The main bearings are bad, so I'll be pulling the engine again and putting in a crankshaft kit.
While the engine is out, is there a sure way to check the balance of the flywheel? How much should it weight, are there numbers to look for on the flywheel, et c.???
Thanks,
Farlight7
My mechanic thinks the Remanufactured Flywheel I bought might not be balanced properly. (The 351w came out of an automatic).
The main bearings are bad, so I'll be pulling the engine again and putting in a crankshaft kit.
While the engine is out, is there a sure way to check the balance of the flywheel? How much should it weight, are there numbers to look for on the flywheel, et c.???
Thanks,
Farlight7
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The 351 uses a 28oz balance flywheel/flexplate. So if you reused or ordered one for the 302 then the vibration is more likely than not the flexplate somthing like 82 down used a 28 oz and 82 or so up used a 50 oz, hope this helps some. later
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Junior User
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From: Hubbard USA
I ordered the Flywheel for the 1990 351w. I only hope that's what actually came in the box. Anyway to check to make sure?
Do the remanufacturers check the incoming cores, and confirm they are labeled correctly?
Farlight7
Do the remanufacturers check the incoming cores, and confirm they are labeled correctly?
Farlight7
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Is there a part number on it? If so call them back and see if you can reference the number if it doesn't have a weight stamped on it somewhere. Worse case scenario I would think a tranny shop could double check it for you. Did you install a pilot bearing?
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From: Hubbard USA
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i am not a pro at this or a mechanic. but i swapped a 300 6cyl standard, to a 351 standard that was an automatic, now my point being is that the flywheel measured the same and bolted up the same and i was getting ready to bolt the 351w in that evening when a mechanic friend told me that i would get vibration and tear out the bottom end within a week , he mentioned that all flywheels are weighted differently for all engines, and thanks to his advice i didn't regret spending the 350.00 bucks, unfortunately i found out that getting a flywheel for a 351 w is not easy but not hard to find but expensive.
like i said though i am not a pro or a mechanic but hope this helps you make the decision
like i said though i am not a pro or a mechanic but hope this helps you make the decision
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Joined: Jul 2001
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From: Huntersville
If you can't cross reference the numbers take a tape measure and measure the actual weight on the flywheel. Post it back on here and I'll measure the weight on a flexplate with a 50 oz weight on it. If you put the 2 side by side it is very noticeable which is the 50 oz
Clint
Clint
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Joined: Jul 2002
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From: Bend,OR
im swapping my tired 302 for a 351 . my tranny is an AOD. So I found that a crownvictoria late 80's came with a 351/AOD. so got one from a wrecking yard for $50. the motor is going in this weekend.
late
late
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Junior User
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From: Hubbard USA
Will do, hopefully I get the engine out this weekend. But I want to get this vibration/flywheel problem figured out. Don't want to ruin a brand new crank and bearings.
Any chance engine vibration could be caused by the harmonic balancer??
Or could the crank be so worn that its wobbling around??
Auto to Auto: that's the way to go. I got my engine from a van with auto, but in went into my truck with 5 speed manual.
Any chance engine vibration could be caused by the harmonic balancer??
Or could the crank be so worn that its wobbling around??
Auto to Auto: that's the way to go. I got my engine from a van with auto, but in went into my truck with 5 speed manual.
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From: Hubbard USA
Finally got the engine out of the truck. Did it by myself, 3 1/2 hours from truch to engine stand. Only dropped it once : ).
Not really dropped, just let the cherry picker down too fast.
The flywheel info:
Casting numbers are E8TR-AA
5 7D3
the dimensions of the counter weight are 1 1/2 inches high
5 1/2 inches at the widest and 3 3/4 inches at the narrow.
Thanks for all the help.
Farlight7
Not really dropped, just let the cherry picker down too fast.
The flywheel info:
Casting numbers are E8TR-AA
5 7D3
the dimensions of the counter weight are 1 1/2 inches high
5 1/2 inches at the widest and 3 3/4 inches at the narrow.
Thanks for all the help.
Farlight7
Elder User
Joined: Jul 2001
Posts: 602
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From: Huntersville
O.K., went out and measured the flexplate that came with my AOD. It is out of a late modle Mustand so it should be 50 oz. i know side by side with the one I bought for my 351W there was a noticable difference between the sizes of the weights,
Measuring this one at the top of the radius is 4 1/4" bottom of radius is 4" it is 15/16" wide and 1/2 thick. Does not sound anywhere as large as the one you have so I am at a loss.
WWhen I did my AOD swap I went to Autozone and bought a reman. flexplate for a 1990 F150 5.8 AOD. It might be worth it too you to at least take yours to a parts house and compare it too one out of a 90 F150 5.8 AOD. Mine was'nt but $45.
Hope this helps
Clint
Measuring this one at the top of the radius is 4 1/4" bottom of radius is 4" it is 15/16" wide and 1/2 thick. Does not sound anywhere as large as the one you have so I am at a loss.
WWhen I did my AOD swap I went to Autozone and bought a reman. flexplate for a 1990 F150 5.8 AOD. It might be worth it too you to at least take yours to a parts house and compare it too one out of a 90 F150 5.8 AOD. Mine was'nt but $45.
Hope this helps
Clint