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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!
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.
All 289s had 3-bolt 28 oz balancers. '68/'69 passenger car 302s had 3-bolt 28 oz balancers. In 1970, the 302s in passenger cars were changed to a 4-bolt 28 oz balancer (water pump inlet was also changed from pointing off to the right side of the engine to pointing to the left). The Bumpsides used the 3-bolt harmonic balancer on the 302s from 1969 through 1972.
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.
Thanks for the clarification. And just to make the point that three-bolt 50 oz balancers do exist.
You're welcome. The three bolt holes are there (on this 5.0L Explorer harmonic balancer). They just aren't for the purposes of bolting a pulley onto it. They're just present for attaching a puller for removal of the balancer from the crank.
There are aftermarket 50 oz 302/5.0L balancers designed for 3-bolt pulleys though.
Thanks guys for the help. So the balancer is right... now the part I'm not looking forward to. Pulling the tranny and looking at the flywheel lol. I may need help identifying that too once I get it out. Looks like I got my Saturday plans! Lol
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.
Thanks I'll check it out when I'm putting it back together . It's a 3 speed. Not sure what they call that one. seems to be pretty good. Clutch feels good just have that shake when you give it gas. In neutral or in gear. Kinda feels like it's around the back of the motor.
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