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« 1 ... 38 39 40 (41)

Re: Ken's 1937 120 Touring Sedan
Not too shy to talk
Not too shy to talk

Russell Harmon
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Ken, thanks for the tip. When I had the radiator redone it was supposed to be a “high flow” but modern style core. Perhaps that is the issue.

Mixture, valve lash & timing have all recently been checked.

Thanks again!

Posted on: 9/29 18:26
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Re: Ken
Home away from home
Home away from home

Ken_P
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Long time, no post. I've been away for work for some of it, just busy moving and living life for some of it. I have been out in the car quite a bit, and the more I drive it, the better it gets.

I am working a long-standing problem, and hoping for some insight here.

When taking off, I would often get a loud "clunk". I initially suspected the cause as driveline u-joints. I replaced those, no change. Also new engine mounts and significant looks at the exhaust to make sure it didn't hit the frame. This spring, I had a helper look at the drivetrain when I was taking off. There is significant pinion motion when taking off, especially if transitioning from reverse to forward. That seems to be the source of my clunk.

I was assuming a rear suspension problem, and have begun disassembly and inspection, but so far I have found no smoking guns. I have both leaf springs off, gaiters removed, and while I'm still cleaning, I haven't found any cracked springs, broken shackles, broken shackle bolts, bad bushings, or any obvious problems. Other than chipping through 85 years of grease buildup, I was amazed how easily everything came apart.

I did find grease from the passenger side shackle on the fuel tank and rubbing on the passenger rear wheel well, indicating that the whole rear axle assembly is shifting to the left.

The ONLY issue I've found is that right rear shackle feels a bit looser than the left. With the axle disconnected from the leaf springs, I could get more lateral play out of the passenger leaf spring than the drivers.

Anyone experience this? How tight should the shackles be? Is it possibly just worn out leaf springs? The car has about 54k miles on it.

Thanks in advance!

Attach file:



jpg  85 years of grease.jpg (412.59 KB)
2964_6362ae25e0d6a.jpg 1512X2016 px

jpg  Next generation Packard owner.jpg (349.88 KB)
2964_6362ae671a82c.jpg 1512X2016 px

jpg  Shackle grease on fuel tank, passenger side.jpg (755.60 KB)
2964_6362ae87d7e9a.jpg 2419X3226 px

jpg  Rub marks on passenger side inner fender.jpg (1,226.12 KB)
2964_6362aebc505b7.jpg 3226X2419 px

Posted on: 11/2 12:03
1937 120 1092 - Original survivor for driving and continued preservation.
http://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=16514&forum=10

1937 115 1082 - Total basket case, partial restoration, sold Hershey 2015
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?start=0&topic_id=6550&order=ASC&status=&mode=0
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Re: Ken
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HH56
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This doesn't give any specs on tightness or define the noise but maybe something in it could be applicable.

Attach file:



jpg  shackle.jpg (384.00 KB)
209_6362a97545b9f.jpg 1078X1250 px

Posted on: 11/2 12:31
Howard
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Re: Ken
Home away from home
Home away from home

Ken_P
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Howard, that's helpful, thanks! I'll check both shackles and see if the passenger one was assembled incorrectly long ago.

Posted on: 11/3 10:02
1937 120 1092 - Original survivor for driving and continued preservation.
http://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=16514&forum=10

1937 115 1082 - Total basket case, partial restoration, sold Hershey 2015
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?start=0&topic_id=6550&order=ASC&status=&mode=0
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Re: Ken
Home away from home
Home away from home

39SixSedanMan
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Ken, there is a Service Letter that may apply. I recall it stating that a small amount of axle housing rotation during launch can result in the drive shaft needing to telescope just a bit (can't remember if shortening or lengthening) causing the sound.
The resolution was to change the angle of the rear axle just a bit by introducing tapered shims with just a couple degrees of angle.

Pat

Posted on: 11/4 14:46
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Re: Ken
Home away from home
Home away from home

39SixSedanMan
See User information
Ken, there is a Service Letter that may apply. I recall it stating that a small amount of axle housing rotation during launch can result in the drive shaft needing to telescope just a bit (can't remember if shortening or lengthening) causing the sound. The resolution was to change the angle of the rear axle just a bit by introducing tapered shims with just a couple degrees of angle. Pat

Posted on: 11/4 14:46
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Re: Ken
Home away from home
Home away from home

Ken_P
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Pat, thanks for that. I'll take a look.

Spent some more time this weekend on the springs. After cleaning everything up, still no smoking guns. There are some wear marks on each main leaf where the gaiters have rubbed for the last 85 years, but no cracks or anything that I can see. The ONLY issue that I have found so far, in addition to the right spring having more lateral motion when installed, is that the two leaf springs have a different static height. The passenger side leaf spring is about 1/4" taller than the drivers side.

I didn't take the frame height measurements discussed in the service manual before I disassembled, because I was expecting to find a broken bolt or spring mount.

I tore it down before I remembered that I'm supposed to have the car in a parade on Thursday. Based on that, and no obvious problems, I think I am going to trying swapping leaf springs side to side, and re-installing, using the shackle guidance above (my shackles do have the notches in the outer plate discussed in Howard's post), and see if the problem remains, shifts sides, or goes away completely.

Posted on: 11/7 12:23
1937 120 1092 - Original survivor for driving and continued preservation.
http://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=16514&forum=10

1937 115 1082 - Total basket case, partial restoration, sold Hershey 2015
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?start=0&topic_id=6550&order=ASC&status=&mode=0
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Re: Ken
Home away from home
Home away from home

Ken_P
See User information
I did find one problem - upon cleaning the u-bolts, it was evident that they were a little bit loose. I think this is what was allowing the axle to shift laterally. I also measured the leaf spring arch. Per Eaton spring, factory arch is 8-1/2". Passenger was at 8-3/4" and drivers was at 8-1/4".


I swapped sides of the leaf springs, reassembled everything, and got her back on the road. Clunk is still present, but much softer. I suspect the clunk is from the rear end as Jeff suggests. Perhaps it was made worse by the loose u-bolt, or it sounds the same and it's just my wishful thinking that it's better. Either way, I'm going to drive it!



I am also renewing the shock oil and installing new shock links. We'll see how she rides when I'm all done.

Posted on: 11/14 9:04
1937 120 1092 - Original survivor for driving and continued preservation.
http://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=16514&forum=10

1937 115 1082 - Total basket case, partial restoration, sold Hershey 2015
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?start=0&topic_id=6550&order=ASC&status=&mode=0
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