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The CJ-3A Page :: Forum :: Rambling, Malarky, Rants, Bullsh*t :: Vehicle numbers for Bob
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AuthorTopic: Vehicle numbers for Bob (Read 158 times)
Mike
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Vehicle numbers for Bob
« Thread Started on Oct 4, 2009, 1:18pm »		[Quote]
Hi Bob,

You asked for these a long time ago and again recently, and I figured I better get them to you before I start putting everything together.

Head Casting date of 6 48
[image]

The block casting date has been altered so you cannot read it. I don't know if this was standard practice for a re-manufactured engine or not.
[image]
[image]

block casting number
[image]

transmission casting date
[image]

t-case numbers
[image]
[image]

Bell housing cast date was also altered
[image]

Bell housing serial
[image]

Other stampings
"U" stamped next to number 3 cylinder
[image]

"E" stamped next to number 1,2,4 cylinders
[image]

"3" stamped on each side of front main bearing under oil pan lip
[image]

"Z" stamped near oil pickup under oil pan lip
[image]

engine serial number RMC 15860
[image]

If you need me to look anyplace else just ask Bob,

Mike
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Re: Vehicle numbers for Bob
« Reply #1 on Oct 4, 2009, 3:22pm »		[Quote]
Luka that looks like a fairly late L head casting judging from the wider and reinforced bell house mounting flange. Those are fairly rare as they were only made for a couple of years toward the end of the production before they switched over to F heads.
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Re: Vehicle numbers for Bob
« Reply #2 on Oct 4, 2009, 7:22pm »		[Quote]
I think you may have missed a digit in your engine serial number. Looks like RMC115860.

Larry
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Re: Vehicle numbers for Bob
« Reply #3 on Oct 4, 2009, 8:29pm »		[Quote]
Excellent stuff, Thanks!!!!!!! I will comment on those numbers when I get a few spare minutes. Before it goes back together can you check for two date stampings?

The first is on the top machined surface right rear corner of the transmission case
[image]


And on the top ear of the transfer case
[image]


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Re: Vehicle numbers for Bob
« Reply #4 on Oct 5, 2009, 8:31am »		[Quote]
1st photo; 6.48 is the compression ratio, the casting date appears to be 1 16.
2+3; The block casting date looks normal to me, 7-3 E. Why are you saying it's altered?
4; Block casting 804380 first appeared in about 1952.
5+6; Gear box casting dates.
8; bellhousing cast 5 4 C. You can see the cast screw heads that transferred from the pattern to the mold and onto the final part. The screws were used to hold interchangeable date tags onto the casting pattern.
9; Part number of the rough casting
10-13; Stampings for assembly size variations and locating marks.
14; Serial number RMC115860 would have been a factory Replacement engine for an MC (M-38). I'd say that number puts it at about 1953.

So the gear boxes and bellhousing appear to be original to your Jeep. The vehicle assembly date probably would have been shortly after the last date, so perhaps May/June of 1951.
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Re: Vehicle numbers for Bob
« Reply #5 on Oct 5, 2009, 9:54am »		[Quote]

Oct 5, 2009, 8:31am, BobW wrote:
1st photo; 6.48 is the compression ratio, the casting date appears to be 1 16.
2+3; The block casting date looks normal to me, 7-3 E. Why are you saying it's altered?
4; Block casting 804380 first appeared in about 1952.
5+6; Gear box casting dates.
8; bellhousing cast 5 4 C. You can see the cast screw heads that transferred from the pattern to the mold and onto the final part. The screws were used to hold interchangeable date tags onto the casting pattern.
9; Part number of the rough casting
10-13; Stampings for assembly size variations and locating marks.
14; Serial number RMC115860 would have been a factory Replacement engine for an MC (M-38). I'd say that number puts it at about 1953.

So the gear boxes and bellhousing appear to be original to your Jeep. The vehicle assembly date probably would have been shortly after the last date, so perhaps May/June of 1951.


Cool Bob thanks for the great explanation. Yea I realized that the 6 48 was the compression ratio after I posted the message. :-/ (I really need to think about what I am writing before I post)

I had written in my notes 6-7 years ago that the engine had ties to the M-38 so I am glad you confirmed it. As for the date codes I guess I expected the year to be on the block casting not just 7-3..... Do the letters "E", "C", etc... stand for a certain year?

Here are some of the pics you requested for the t-case (I tried my best to get the numbers to come out good) I will get the transmission tonight:

t-case:
[image]
[image]
[image]

I am going to print out your explanation and put in my notes, I love knowing the history of my vehicle.......

Thanks again,
Mike
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Re: Vehicle numbers for Bob
« Reply #6 on Oct 5, 2009, 10:01am »		[Quote]

Oct 4, 2009, 3:22pm, Doug wrote:
Luka that looks like a fairly late L head casting judging from the wider and reinforced bell house mounting flange. Those are fairly rare as they were only made for a couple of years toward the end of the production before they switched over to F heads.


Thanks Doug,

Yea on the passenger side the back flange covers 60% of the hole that lets you see the TDC and 5 degree mark on the flywheel which kind of sucks. Also you can tell the bell housing and engine were not originally made for each other, they bolt up fine but the various dimensions of all the mating surfaces tell you that they are intended for different partners. Also I like you just use grade 8 bolts to mate the engine and bell housing, I have never seen or read about alignment pins/dowels.

Thanks,
Mike
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Re: Vehicle numbers for Bob
« Reply #7 on Oct 5, 2009, 10:04am »		[Quote]

Oct 4, 2009, 7:22pm, rocketeer wrote:
I think you may have missed a digit in your engine serial number. Looks like RMC115860.

Larry


Thanks Larry,

Typo by me for not getting the extra "1" in there.

I am glad everyone here agrees the number ends in a "0" (zero) because the previous owner (or me) put a little mark in the last letter that REALLY makes it look like a "Q"...


Mike
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Re: Vehicle numbers for Bob
« Reply #8 on Oct 5, 2009, 5:29pm »		[Quote]
Mike,

Thanks for the transfer case photos. It looks like 5-18-51C to me, is that what you are seeing?

I am currently working on finding patterns in the cast date code letters.

In one of your previous threads it looks like you have a later bolt-on timing pointer on the engine so you don't need the blocked timing hole at the rear.
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Re: Vehicle numbers for Bob
« Reply #9 on Oct 5, 2009, 6:19pm »		[Quote]

Oct 5, 2009, 5:29pm, BobW wrote:
Mike,

Thanks for the transfer case photos. It looks like 5-18-51C to me, is that what you are seeing?

I am currently working on finding patterns in the cast date code letters.

In one of your previous threads it looks like you have a later bolt-on timing pointer on the engine so you don't need the blocked timing hole at the rear.


Hi Bob

The "8" is actually a "6" so I see 5-16-51C but the first first 5 is really suspect.

Anyway here is the Transmission numbers:
[image]
[image]

As for the timer pointer I put that on after Larry posted the source here on the CJ3A page (cost me more in shipping than the actual part). But when I finally got off 3 layers of paint with runs that looked like it was put on with a paint brush I found the original marks in the timing cover. I am going to do some special highlighting with white paint and black paint to make these really show up once the engine is complete.
[image]
[image]
[image]

Thanks again everyone

Mike
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Re: Vehicle numbers for Bob
« Reply #10 on Oct 5, 2009, 7:07pm »		[Quote]
E281 is April 28, 1951
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Re: Vehicle numbers for Bob
« Reply #11 on Oct 22, 2009, 12:36pm »		[Quote]
Bob,
Why would an "E" be April? If "E" is the fifth letter, would that be the 5th month? I am curious. JamesR
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Re: Vehicle numbers for Bob
« Reply #12 on Oct 23, 2009, 8:33pm »		[Quote]

Oct 22, 2009, 12:36pm, jamesr wrote:
Why would an "E" be April?


Because I can't count, you are correct.
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