Engine Block cast W1 with higher serial number

Nov. 18, 1941 - MB100001 thru Mar. 6, 1942 - MB125809 NO EBAY or COMMERCIAL SALES.
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ppinotti
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Engine Block cast W1 with higher serial number

Post by ppinotti » Sat Oct 17, 2020 2:16 pm

Dear Friends,

A friend here in Brasil is rebuilding the engine of his Slat Grill SN124.851.

The engine block is W1 but has a high serial number 390.136, and inside the block there is a date stamped 3-44, that date I could not took a picture, I saw but when I returned to take a picture the engine was already closed.

In my opinion the engine is not original of the jeep was changed sometime. But the issue is the engine block is a early block assembled in 1944 and put in a 1944 MB and sent to Brasil, where the engine was moved to the Slat Grill. A commom situation in Brazilian Army.

Regards
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Paulo Pinotti
GPW 165420 DOD 12/14/1943 - Dallas Plant
Sao Paulo - Brasil


Adam
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Re: Engine Block cast W1 with higher serial number

Post by Adam » Sat Oct 17, 2020 6:02 pm

Why do you say i is an early block? Just due to the W1? Serial number looks non original, oval pad looks tampered with,, dash is missing after MB,

adam

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Re: Engine Block cast W1 with higher serial number

Post by ppinotti » Sun Oct 18, 2020 6:09 am

Adam,

Thank you for your comments, I learned more details about the engine block.

I will pay attention in this details you describe.

One question the letter W and the number indicate the cast year of the block. But can be assembled later. Keep in storage?

Thanks for the information.

Best regards
Paulo Pinotti
GPW 165420 DOD 12/14/1943 - Dallas Plant
Sao Paulo - Brasil

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Re: Engine Block cast W1 with higher serial number

Post by Adam » Sun Oct 18, 2020 6:15 am

1W is a mold number or something has nothing to do with dating it.

5- 23 is the date block was cast at the foundry. no year here ever though.


3-44 is the date it was machined at the foundry, what is the other digit before the 3?

look at the front water pump impeller hole, 1 big hole or 1 big and 1 smaller to the right. 2 holes is early, 1 hole is later.

I dont have my serial number list with me to see what the engine numbers could be.

Adam

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Re: Engine Block cast W1 with higher serial number

Post by ppinotti » Sun Oct 18, 2020 2:43 pm

Adam,

The number before the 3 is 2.

I will check the water pump.

Thank you.
Paulo Pinotti
GPW 165420 DOD 12/14/1943 - Dallas Plant
Sao Paulo - Brasil

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ppinotti
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Re: Engine Block cast W1 with higher serial number

Post by ppinotti » Sun Oct 18, 2020 4:21 pm

Adam,

After your post, I made some researches in books and internet about the W1 stamped in the block.

Is this code linked to the Willys contract W1, for jeeps delivered from November 41 till February 42, and the blocks made to this contract had the code W1, not necessarally used in the jeeps, due the large quantity of Wllys engine used in other applications(The Military Jeep MB/GPW Lawrence Nabholtz), or assembled on later production jeeps.

Can you comment what I think about.

Best regards
Paulo Pinotti
GPW 165420 DOD 12/14/1943 - Dallas Plant
Sao Paulo - Brasil

Adam
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Re: Engine Block cast W1 with higher serial number

Post by Adam » Sun Oct 18, 2020 6:05 pm

As far as anybody knows, nobody has exact info on what the W numbers are,Most likely, W1 is the casting mold used to make the sand casting for that engine, WW2 has up to W7, I think,would have to do some searching, I have seen up to W11 or something like that, in post war engines. Willys did not make the engines, the wilson foundry did, and they are the ones who stamped the date on the bottom of the engine.

If you can look at that water pump area, and find only 1 hole, it will prove the engine is not very early or early at all, most likely mid or mid/late war.

Adam

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Re: Engine Block cast W1 with higher serial number

Post by ppinotti » Mon Oct 19, 2020 5:02 am

Adam,

Thanks again for the information.

I will check the water pump.

Best regards
Paulo Pinotti
GPW 165420 DOD 12/14/1943 - Dallas Plant
Sao Paulo - Brasil

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Re: Engine Block cast W1 with higher serial number

Post by ppinotti » Sat Oct 24, 2020 11:40 am

Adam,

Today I was in the garage where the engine is, and I took a picture of the water pump assembly.

According your information, is a late engine block, correct?

Best wishes
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Paulo Pinotti
GPW 165420 DOD 12/14/1943 - Dallas Plant
Sao Paulo - Brasil

Adam
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Re: Engine Block cast W1 with higher serial number

Post by Adam » Sat Oct 24, 2020 12:20 pm

yepper, i would go with the date on the oil pan flange and the cast date on the side.

Adam

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Re: Engine Block cast W1 with higher serial number

Post by ppinotti » Sat Oct 24, 2020 1:34 pm

Adam,

Thank you for your lesson!

So the engine block is from 1944, as the date in the oil pan.

Best wishes
Paulo Pinotti
GPW 165420 DOD 12/14/1943 - Dallas Plant
Sao Paulo - Brasil


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