Are you certain it is a 1979 175B?
I looked at machine 4291U001952 which is a C model, & it is as I understand a 1975 model.
This thread contains IH construction equipment serial number lists and engine cross reference information. Excellent info for ascertaining the year of manufacture of your crawler tractor and the engine it uses, not to mention the other machines that use the same engine. If you have questions abou...
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175 1972-1996 series C [ 429-1U ]
WT-30100lbs Bucket-2yd
501-1972
1204-1973
1888-1974
2489-1975
2791-1976
2843-1977
3171-1978 3362 end
175 [ 429-4U ]
3501-1978
3591-1979
3726-1980
What’s your serial number?