Cylinder casting dates

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1950Panhead
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Cylinder casting dates

#1

Post by 1950Panhead » Sat Nov 27, 2010 2:19 am

Will someone who has seen lots of panheads explain the casting dates.
I have attached some photos. There are two screw in mold date types and a stamping.
It looks like the format may be day-month without a year.
Years can only be determined by construction?
48-52 drain go through case.
53-62 drain goes through cylinder
63-65 does not have feed (external)
All repops don't have casting dates?
Jerry
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Cotten
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Re: Cylinder casting dates

#2

Post by Cotten » Sat Nov 27, 2010 1:22 pm

Jerry!

I think the code is week-year on the screwed pads.

....Cotten

Robert Luland
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Re: Cylinder casting dates

#3

Post by Robert Luland » Sat Nov 27, 2010 1:44 pm

The Letter outside of the tag is the month. If you go buy your last photo> January 13. 1953. I was always told that the 13 would be the day but I have to agree with Tom. I can’t see the factory changing the date code on the mold every day but anything’s possible. 1948 was the outcast. On my 48, you have the stamped number that you show on the front cylinder but no markings on the rear. Bob L

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Re: Cylinder casting dates

#4

Post by dbanana » Sat Nov 27, 2010 2:39 pm

Cotten wrote:Jerry!

I think the code is week-year on the screwed pads.

....Cotten
just my .02......no disrespect intended

if it was week/year.....there should be examples with 32-52 ie: M *52-3*

in the last pic....if the A is Jan. how could you be in the 13th week in Jan ?

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Re: Cylinder casting dates

#5

Post by Sir_Rat » Sat Nov 27, 2010 3:02 pm

if the A is Jan. how could you be in the 13th week in Jan ?
Long Winter??? :P

Aloha.....Mike

Robert Luland
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Re: Cylinder casting dates

#6

Post by Robert Luland » Sat Nov 27, 2010 3:20 pm

dbanana wrote:
Cotten wrote:Jerry!

I think the code is week-year on the screwed pads.

....Cotten
just my .02......no disrespect intended

if it was week/year.....there should be examples with 32-52 ie: M *52-3*

in the last pic....if the A is Jan. how could you be in the 13th week in Jan ?
Good point, obviously you had your coffee before me.

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Re: Cylinder casting dates

#7

Post by Cotten » Sat Nov 27, 2010 3:28 pm

dbanana wrote:
Cotten wrote:Jerry!

I think the code is week-year on the screwed pads.

....Cotten
just my .02......no disrespect intended

if it was week/year.....there should be examples with 32-52 ie: M *52-3*

in the last pic....if the A is Jan. how could you be in the 13th week in Jan ?
Dbanana!

I was just repeating a rumor.

If A is January, then what months are M and P?

These things are stuck upon patterns, presumeably wood. The screwed-on tags could be changed at will, but the letters appear to be glued or pinned to the pattern. Thus, perhaps, the letter denotes the pattern while the tag dates the casting.

And I suspect the second digit represents the year in the same way it was used on frames.

....Cotten

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Re: Cylinder casting dates

#8

Post by dbanana » Sat Nov 27, 2010 3:39 pm

Cotton....I am only repeating what I have read. The M would be Dec. (as they didn't use the letter I because it looked too much like the # 1 ) I was only using the M as an example.

Danny

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Re: Cylinder casting dates

#9

Post by panz4ever » Sat Nov 27, 2010 5:48 pm

So M-13-3 could be Dec 13 (53/63 depending on oiling system) if you exclude the letter "I" and A-17-7 could be January 17 (57/67)?

Anyone have a cylinder with a letter later than 'M'?

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Re: Cylinder casting dates

#10

Post by Cotten » Sat Nov 27, 2010 6:06 pm

Coulda swore I saw a P in the pics, me wrong again.

My wife's '65 has J [11-3] on the front and F [24-4] on the rear, while my scattered '65 stroker has K [1-4] and J [10-4], and one I need cases for is D [15-3] and H [19-3]

But! My '37 OHV has [11-22] and [12-5] and no big letters!

Some of the dead soldiers on my shelf have no tag or letter at all.

....Cotten
PS: I've a a perfect head on the shelf that has 4-65 on the tag! Pity its a Chubble.

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Re: Cylinder casting dates

#11

Post by panz4ever » Sat Nov 27, 2010 7:34 pm

49 pan...H-12-0; H-16-0

56 rat pan project...F-19-0; F-9-0

65 pan...A-25-4; A-17-4

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Re: Cylinder casting dates

#12

Post by panhead_kicker » Sat Nov 27, 2010 10:02 pm

64 pan
Front = J 12-3
Rear = H 27-3

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Re: Cylinder casting dates

#13

Post by Cotten » Sat Nov 27, 2010 10:54 pm

So,

Until we find a letter beyond M,
or a first tag digit higher than thirty-one,,

We are lead to believe that they absurdly denoted the month separately from the conjoined day and year. And the letters really looked like they were stuck on with bubblegum. Some of my late models are hard to read.

My Knuck must be a whole 'nother system, just like the chubble jug seasoning on my patio that says 4-71 with a separate tag: 1013, whatever that means.

Does Panz4ever have two sets of 1950 cylinders, or 1960?

This would have been the founder's doing, not H-D.
Now please help me remember: What was MOCASCO,.. "Motor Casting Corp", or maybe "Minnesota Casting Corp", or maybe castings could be either?

Thanks in advance,

....Cotten

1950Panhead
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Re: Cylinder casting dates

#14

Post by 1950Panhead » Sat Nov 27, 2010 11:13 pm

Panhead flywheels have a large M over a smaller c.
This is the foundry hallmark, I would like to know who this is.
I have not seen this hallmark on panhead cylinders.
Notice that the date tags are two sizes, large and small.
Why would a foundry use two different sizes of date tags?
Maybe the small tag is from one foundry and the large tag is from another.
The year seems to make more sense on later pan cylinders.
I don't think the year is in the date code for early cylinders.
Very interesting and puzzling.
Palmer does not reference these codes, it seems like he would have if it was obvious.
Jerry

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Re: Cylinder casting dates

#15

Post by Robert Luland » Sat Nov 27, 2010 11:33 pm

From what I've seen. The dating code didn't start until late 48 season. Bob L

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