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38 Twelve loose crankshaft pulley
#1
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Peter Packard
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Hello all and Happy Easter( not sure if we can say that any more).
I have been irritated by a minor "rattle" in my 38 Twelve for the past nine years and used this holiday to trace it. I thought that I had found it a few years ago when I dropped the sump for an inspection and found No 7 wrist pin was slightly worn. I replaced the bush and the noise changed but a noise was still there. My thermostat failed a few weeks ago and a new one has arrived, many thanks to the Flackmaster "Mr unobtainium". Whilst prepping to change same I removed the belts to obviate water pump or generator "rattles". sure enough the rattle was still there but the absence of the belts yielded a new aspect to the noise. I noticed that the Crank wobbled. I shut off the engine and Viola!. The crank pulley is loose. It is a prick to get to and I would like to know the AF socket to use. Could someone with a V12 engine out of a car please check the socket size for "Motor Crankshaft fan pulley screw 221498" I suspect 1.875 ( inch and seven eights). April fools joke attached.

No new Covid positive cases in Australia today. good news Peter Toet

Attach file:



jpg  053-Googong-17JUN12.jpg (62.34 KB)
154_606969055b92c.jpg 332X500 px

Posted on: 4/4 1:21
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Re: 38 Twelve loose crankshaft pulley
#2
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blue40devil
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I checked mine and it is 1 7/8".

Good luck

Posted on: 4/4 6:49
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Re: 38 Twelve loose crankshaft pulley
#3
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Peter Packard
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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: 4/4 12:50
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Re: 38 Twelve loose crankshaft pulley
#4
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flackmaster
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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: 4/5 7:32
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Re: 38 Twelve loose crankshaft pulley
#5
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64avanti
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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: 4/5 10:05
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Re: 38 Twelve loose crankshaft pulley
#6
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blue40devil
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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: 4/5 14:03
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Re: 38 Twelve loose crankshaft pulley
#7
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Owen_Dyneto
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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: 4/5 16:11
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Re: 38 Twelve loose crankshaft pulley
#8
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blue40devil
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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: 4/6 13:18
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Re: 38 Twelve loose crankshaft pulley
#9
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Owen_Dyneto
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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: 4/6 14:25
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