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Minneapolis Moline Tractors Discussion Forum

UTU Heads

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Greg

10-29-2003 09:32:55

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Does anyone know where I can find out what heads are suppose to be on a 1950 UTU tractor? I just aquired my grandfather's tractor and it has two different head on it (10A4206 and GE30J).

Thanks in advance for the information

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ACEd

11-03-2003 11:16:08

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Re: UTU Heads in reply to Greg, 10-29-2003 09:32:55

MM Repair Catalog R1056E for U with 283A4 from tractor 334001 (circa 1947) up to UTU 01108297 / UTS 01205553 et al (circa mid 1951) says for 70 Octane Gas its GE30E for Distillate GE30K for LP GE30J

Beginning in 1951 after the above s/n (beginning motor 01914127 and ending motor 01924196) per R1115A they also had different heads for different altitudes: GAS Sea Level to 4000 ft GE30E
GAS 4000-8000 ft GE30M
GAS above 8000 ft GE30J
Tractor Fuel(Dist) Sea Level to 4000 ft GE30K
Tractor Fuel(Dist) 4000-8000 ft GE30N
Tractor Fuel(Dist) above 8000 ft GE30E
LP Sea Level to 4000 ft GE30J
LP 4000-8000 ft GE30P
LP above 8000 ft GE30T

Beginning with motors after 01924196 the GAS only changed again per R1115A to: GAS Sea Level to 4000 ft GE30M or GE30Z
GAS 4000-8000 ft GE30J
GAS above 8000 ft GE30P

Beginning with all UB and with UTS after s/n 01210571 (beginning 283B4 motor 06100001) per R1119D they had 10A series heads for different altitudes (note I have an early UB with GE30Z heads): GAS Sea Level to 4000 ft 10A4210
GAS 4000-8000 ft 10A4213
GAS above 8000 ft 10A4206
Tractor Fuel(Dist) Sea Level to 4000 ft 10A4204
Tractor Fuel(Dist) 4000-8000 ft 10A4205
Tractor Fuel(Dist) above 8000 ft 10A4209
LP Sea Level to 4000 ft 10A4206
LP above 4000 ft 10A4207

Best Ed

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ACEd

11-03-2003 09:41:17

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Re: UTU Heads in reply to Greg, 10-29-2003 09:32:55

MM Service Letter 266 gives following Compression Ratios for 10A heads on 283 ci U motor. (Note heads also common to G and M5 but not same CR on different jugs / cranks) Equivalence from other sources.
GE30D, GE30K, 10A4204 = 4.5:1
GE30N, 10A4205 = 5.2:1
GE30E, GE30F, GE30H, GE30W, 10A4209 = 5.5:1
GE30M, GE30Z, 10A4210 = 6.95:1
GE30J, 10A4213 = 7.55:1
GE30P, 10A4206 = 8.35:1
GE30T, 10A4207 = 9.3:1

Have more info, but will post later

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Andy

10-29-2003 10:28:57

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Re: UTU Heads in reply to Greg, 10-29-2003 09:32:55

If it is LP fueled either of those heads are correct but not mixed like that. 30J is that same as a 4213. That is hard on the rod and main bearings to run it like that. if you find a GE 30P that is the same, (older part number) as a 4206. If it is a gasolene they came with 4209,(30E) or 4210 (30Z).

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Greg

10-29-2003 11:23:28

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Re: Re: UTU Heads in reply to Andy, 10-29-2003 10:28:57

This tractor orginally ran on gas, but was switched to LP. I am thinking about switching back to gas though. If I found a matched head to either one of these heads, do you think that it would run alright on the gas they sell today?

Once again, thanks for your response in advance

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Andy

10-30-2003 18:24:23

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Re: Re: Re: UTU Heads in reply to Greg, 10-29-2003 11:23:28

If you run 4213's (30J) you should be fine. If you run 4206, (30P) you will be on the edge of pre-ignition. I had a U with this setup and I blended ethynal with the fuel to prevent dieseling when I shut it off.

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