Re: 38 Twelve loose crankshaft pulley
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Home away from home
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I checked mine and it is 1 7/8".
Good luck
Posted on: 2021/4/4 7:49
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Re: 38 Twelve loose crankshaft pulley
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Home away from home
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Thanks for confirming that. I suspect that the attachment bolt has bottomed as it will not tighten further and the pulley is still loose. I fear that I shall have to remove the bolt and check this. There is no washer listed and I may have to shorten the bolt or put a large washer on. Has anyone come across this issue before? I do not feel like pulling the front clip on the car just to get to the pulley bolt. Peter T
Posted on: 2021/4/4 13:50
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I like people, Packards and old motorbikes
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Re: 38 Twelve loose crankshaft pulley
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every harmonic balancer I've ever worked with has a big thick washer under the head of the bolt...sorry to say. But I've never done a 12..and I don't see a washer or lockwasher in the parts list either. Surprising...does show for 1703/jnrs in the 35-41 book.
DAF
Posted on: 2021/4/5 8:32
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Re: 38 Twelve loose crankshaft pulley
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Home away from home
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LOVE the photo.
Had a loose dampener years ago that ate up the crank key way. The dampener was easy to source but the crank was metal sprayed & re cut for the new key. Happy ending :)
Posted on: 2021/4/5 11:05
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Re: 38 Twelve loose crankshaft pulley
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Home away from home
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If you look at a cutaway of the 12 in the parts book, page 98 in mine, there is obviously a washer under that bolt in the diagram.
Posted on: 2021/4/5 15:03
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Re: 38 Twelve loose crankshaft pulley
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Forum Ambassador
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Packard blueprint MISC1-847 (engine assembly details, Twelve) does not show a washer. It does show quite a bit of available threaded but unused blind space behind the bolt, such that it would be impossible for an OEM bolt to bottom out.
Just as an aside, these MISC-series blueprints of engine assembly notes for the 320, 385 and Twelve engine have a lot of information not easily found elsewhere.
Posted on: 2021/4/5 17:11
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Re: 38 Twelve loose crankshaft pulley
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Home away from home
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Dave,
Is there a copy of that print on this site, if not where can I get one? Thanks Bill
Posted on: 2021/4/6 14:18
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Re: 38 Twelve loose crankshaft pulley
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Assuming they have it in their inventory, you could get the blueprint copy from the Packard Motor Car Foundation (Packard Proving Grounds). Bruce Blevins runs the project, just reference the print # I provided.
Posted on: 2021/4/6 15:25
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Re: 38 Twelve loose crankshaft pulley
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Hello all, Very appreciative of the input and I would like to provide a bit of detail in how I am convinced that I have resolved the loose crank pulley for others that may encounter the same problem.
Packard 12 engines are not cheap to do anything with...a $A40k potential problem. Well, the pulley crankshaft bolt inch and seven eighth, seven eighth UNF 16tpi together with the crank thread were stripped as the bolt had topped out on the crank without the pulley being tensioned, possibly due to working of a developing clearance There was no way to make an original bolt work and a NOS bolt was doomed to fail. The original bolt has a 1.75 AF ( across flats) dimension and I defy anyone to get a socket behind the radiator shroud. I was not prepared to do a front clip removal on the Twelve ( have done 120's and 25th Series) and decided to remove the lower approx 12 inches of the shroud and it is replaceable although the skin on my knuckles from the grinder will take a little longer. The original 1.875 bolt, .825 inch 16 TPI was 1.25 inches in length. I have manufactured a 13/16th AF 2.15 inch in length bolt of the same thread dimensions and a cup washer of 0400 inches, recessed .25 inch to allow it to press onto the pulley rather than bottom on the crank. there is 1.75 inches available in the crankshaft. I fitted this and also locktighted the arrangement. I have driven it approx 100 miles and it appears to have resolved a faint but "bound to get worse" noise. Twelves are quality products and are meant to be very quiet. Peter T
Posted on: 2021/4/20 3:02
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I like people, Packards and old motorbikes
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