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WD-9 / 4-71 Detroit conversion


IH OAK

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A neighbour has a HD 19 that got turned into a farming tractor.  It now has an 8v71 and a Spicer heavy duty gearbox hooked to the Allis rear end.  And an air cab.  As he says whoever did it knew exactly what he was doing.

He used it on a heavy duty blade plow.  It is still mobile but pretty well retired now.

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I have a cousin still running several HD 9's to farm with. Still running 4-71's but latter heads with bigger valves and injectors and bigger dry air cleaners. He has a bit of final drive trouble over the years. But it starts with cap screws backing out. Going from 5/8 to 3/4 has helped.

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2 hours ago, Rawleigh99 said:

Ray, I think they made that upgrade on the next series (was it the HD11)?

According to tractordata the HD 11 uses an Allis engine.  AC bought out Buda in the mid 50s to get away from using GM engines.

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Yes just a few little things different on the early HD 11 other then the Buda engine. He had early HD 11 before he parted it out the souped up HD 9's out worked it.

 

But I do where to find a HD 11  with a V6 -71. One observer has dubed it Power No shift.

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I was talking about the larger bolts in the final drives.  And I understand that parts for the Buda/Allis engines are very expensive and rare.  That is what is good about the older ones with the Detroits.

They used to put a pair of those 16's in the menhaden fishing boats around here.  Also Detroit powered gensets and the purse boats that carried the net around the fish had 4-71's I think.  They were very popular in work boas around here.  I can still remember hearing the crabbers and oystermen with the dry stacked 6-71's leaving the creeks early in the morning.  Then all the rich folk moved in and started complaining bitterly about them.  My wife's grandfather bought a surplus 6-71 in the crate from my father in the late 50's and it ran in his workboat into the 90's.

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