No engine serial number

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No engine serial number

Postby muleboss » Tue Oct 22, 2013 11:22 am

I have a cub engine that does not have a serial number.
Known about engine- Mfg 9-11-K
Firing order numbers very crude. Could probably not read first 2 numbers if I did not know what they are.

Casting number on block-355741 R6
# 2 stamped in block above 3rd pan bolt on left side (as sitting on tractor)
Letter "L" just left of oil filler (dipstick)
Front cover- 651 674 R1
Oil pump cover- 251398 R1----L IH 7

I do not know what year this was suppost to come from.
I bought it in a pile of a tractor that was in many pieces.
Was told the engine had been replaced and this was original to tractor.
Can not tell you any other parts numbers from tractor as it was parts and I do not know which ones they are.

Question is, Why no serial number on engine.
Thanks Bob
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Re: No engine serial number

Postby Eugene » Tue Oct 22, 2013 1:53 pm

Don't know the answer.

I have a NOS engine block, Casting code 5-16-X, with no serial number. This one came from someone who purchased several crated NOS engines from military surplus.
I have an excuse. CRS.
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Re: No engine serial number

Postby RaymondDurban » Tue Oct 22, 2013 6:07 pm

Engines with no SN's are replacement blocks from IH. Only complete engines were stamped with a SN. Your engine was replaced at some time in the past, with the internals swapped over.

There are many around, here are two that were at last years OK Cubfest.
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Re: No engine serial number

Postby muleboss » Tue Oct 22, 2013 7:18 pm

Raymond, Thanks for the answer. That would mean that cub has had 3 different engines.
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Re: No engine serial number

Postby RaymondDurban » Sun Jun 29, 2014 10:39 am

muleboss wrote:I have a cub engine that does not have a serial number.
Known about engine- Mfg 9-11-K
Firing order numbers very crude. Could probably not read first 2 numbers if I did not know what they are.

Casting number on block-355741 R6
....

Bob, I did a search on the forum for the 355741 block PN and yours was the only hit. I have a question for you about the block, hopefully you still have it.
Was/is the PN raised cast lettering or was the original PN ground off and then the new PN stamped into the cast?
Did the engine have an extra casting in front of the oil filter housing to accept a plug into the water jacket?
Thanks!
Raymond
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Re: No engine serial number

Postby muleboss » Sun Jun 29, 2014 9:05 pm

Raymond,
Yes the numbers are raised, as they should be,
Yes there is a plug in front of the oil filter housing.
Bob
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Re: No engine serial number

Postby brewzalot » Tue Jul 22, 2014 8:22 pm

Raymond or Bob,

I have a 61 cub ( 218968) with all correct casting numbers(G) except for the engine-I will get them all to you for the database. I too have a plug in the casting by the oil filter and no serial number. The block part number has been ground off, I think , and then stamped 355741R1. The engine date code is 4*18*W, can you tell me what I might have or what year that may be?

thanks,
Tim
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Re: No engine serial number

Postby RaymondDurban » Wed Jul 23, 2014 1:32 am

Tim,
You have a 1951 U-1 power unit engine installed in your tractor. The reason that yours and several other members here on the forum have these same PN engines that have the SN ground off is a mystery it seems.
Thanks for the data, and I'll take the rest of your information any time!
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