28oz or 50oz balancer
#1
28oz or 50oz balancer
Hi new to the site and to older ford trucks. I have a 74 f100. The motor has a pretty bad shake when your above idle. The original 302 was swapped out with another 302 casting number e7te. Correct me if I'm wrong but I believe this is a 87 block which would have the 50oz flywheel and harmonic balancer. I took the harmonic balancer off to see what one is on the truck but I don't know how to tell. Hoping someone could help me out. Thanks!
#3
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#6
The balancer you have shown LOOKS like this 50 oz balancer on this '90 Mustang GT 5.0L engine I have. However, looks don't always mean anything.
If you'll look on the thinnest part of the balancer casting, on its edge, you'll see the number stamped on the balancer. This 50 oz balancer on my '90 5.0L engine reads E4TE-A3A.
If you'll look on the thinnest part of the balancer casting, on its edge, you'll see the number stamped on the balancer. This 50 oz balancer on my '90 5.0L engine reads E4TE-A3A.
#7
IIRC, early Windsor balancers where three-bolt and 28 oz, later were four-bolt and 50 oz.
Hybrids do exist! 3 bolt vs 4 bolt harmonic balancer - Vintage Mustang Forums
Hybrids do exist! 3 bolt vs 4 bolt harmonic balancer - Vintage Mustang Forums
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#8
Applications: 1984/89 misc. FoMoCo Passenger Cars 302 (Possibly 1990 and later, I don't have the 1990/98 car parts microfiche slide for engine parts).
1984/95 F150/250; Econoline & Bronco 302.
#9
IIRC, early Windsor balancers where three-bolt and 28 oz, later were four-bolt and 50 oz.
Hybrids do exist! 3 bolt vs 4 bolt harmonic balancer - Vintage Mustang Forums
Hybrids do exist! 3 bolt vs 4 bolt harmonic balancer - Vintage Mustang Forums
In '81, the 4-bolt balancer was changed to a 50 oz imbalance. The flexplate/flywheel has to match the imbalance weight of the harmonic balancer.
The Explorer 5.0L engine harmonic balancer/pulley is essentially one-piece. The pulley doesn't bolt on. It's pressed into the balancer as is the toothed trigger wheel. The only bolt holes on this balancer are the 3 in it for screwing the bolts into it for a puller.
351Ws have a 28 oz imbalance.
#11
There are aftermarket 50 oz 302/5.0L balancers designed for 3-bolt pulleys though.
#13
#14
Look at the keyway on the harmonic balancer and make sure it's not cracked along its length and that the edges of the Woodruff key on the crank are sharp and not rolled over on the edges.
I had this happen on a 302 I had in a '66 Mustang fastback I used to have. The keyway on the harmonic balancer split allowing the balancer to spin on the crank snout, out of phase, and would cause the engine to shake really bad. I replaced the balancer only to have this happen again, later on. This is when I noticed the shoulder on the key was rounded off on the edge. I got another balancer and a new #43 Woodruff key and that problem never came back. I don't know if this is the problem with your engine but it would be a good idea to look and make sure whether or not this is or isn't its problem.
What transmission do you have?
I had this happen on a 302 I had in a '66 Mustang fastback I used to have. The keyway on the harmonic balancer split allowing the balancer to spin on the crank snout, out of phase, and would cause the engine to shake really bad. I replaced the balancer only to have this happen again, later on. This is when I noticed the shoulder on the key was rounded off on the edge. I got another balancer and a new #43 Woodruff key and that problem never came back. I don't know if this is the problem with your engine but it would be a good idea to look and make sure whether or not this is or isn't its problem.
What transmission do you have?
#15