66 F100 damper bolt size

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Oct 8, 2014 | 09:18 PM

AboutTime

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Trailering

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66 F100 damper bolt size

Hello,

I recently purchased a 66 F100 w/ 352. The cam is shot and leak down test was 50% leakage, or better, on each cylinder so I'm going to rebuild. I have the engine out and disassemblied down to pulling the harmonic balancer off. I bought a puller from Sears but the bolts with the puller do not fit the balancer. Can any one tell me the bolt size for the 3 bolt holes in the balancer?

Oct 8, 2014 | 10:10 PM

tbm3fan

Cargo Master

Joined: Jul 2006

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From: Concord, CA

3/8-16 x 3"

Oct 9, 2014 | 03:53 AM

NumberDummy

Ford Parts Specialist

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From: Simi Valley, CA

Quote:

Originally Posted by tbm3fan

3/8" -16 x 3"

Quote:

Originally Posted by AboutTime

I recently purchased a 66 F100 w/352. The cam is shot and leak down test was 50% leakage, or better, on each cylinder so I'm going to rebuild. I have the engine out and disassemblied down to pulling the harmonic balancer off.

I bought a puller from Sears but the bolts with the puller do not fit the balancer. Can any one tell me the bolt size for the 3 bolt holes in the balancer?

The 3 bolts have nothing to do with retaining the harmonic balancer to the crankshaft. Once the 3 bolts are removed, the balancer is still bolted to the crankshaft.

Harmonic balancer includes a single sheave pulley. Ford offered single, double and triple sheave accessory outer pulleys that bolt to the balancer (ONLY!) to add P/S and/or A/C.

So...these 3 bolts are only present if there are accessory outer pulleys. The 3 bolts are 3/8" -16 x 1.00" long. 3/8" is the thread size, not the wrench size.

Pic: Remove the 355721-S bolt (5/8" -18 x 1 1/2" long ~ 5/8" is the thread size, not the wrench size). The balancer comes off the crank along with the accessory outer pulleys.

Notice the 2 different sizes/types of keyways on the crank. One is used to retain the balancer & spacer in place, the other is used to retain the crank gear in place.

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Oct 9, 2014 | 10:19 AM

tbm3fan

Cargo Master

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From: Concord, CA

Bill, those 3 bolts I listed are to be used to pull the damper off the crankshaft snout. The Sears puller does not come with that particular size as I have the same one. I needed to go out and buy the correct size in order to make the puller work. That is what the OP is talking about and I know since I pulled my damper off 2 months ago and just happen to have it sitting around to look at. We are not talking Ford bolts here.

Oct 9, 2014 | 10:45 AM

NumberDummy

Ford Parts Specialist

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From: Simi Valley, CA

Ah ha, now I see what you're talking about. But what is the OP talking about? Does his truck have the accessory outer pulley's that are retained to the balancer with 3 bolts?

Oct 9, 2014 | 05:06 PM

tbm3fan

Cargo Master

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From: Concord, CA

Quote:

Originally Posted by NumberDummy

Ah ha, now I see what you're talking about. But what is the OP talking about? Does his truck have the accessory outer pulley's that are retained to the balancer with 3 bolts?

Well he says he has the engine disassembled down the damper on the crank. I would assume that the pulley is already off at which case all one would need to do is take that bolt down to the hardware store and match it with a longer one. Yet, since he asks which size bolt then maybe there are no 3 bolts nor a pulley. Your guess is as good as mine.

Oct 12, 2014 | 09:46 PM

AboutTime

Thread Starter

Trailering

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Hello all,

I was talking about using the puller and needing the bolt size to purchase, tbm3fan was dead on. I bought the bolts and the balancer is now off.

Bill, Thanks for the additional info. Always willing to learn.