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Hydra Mac 8B Onan Identification
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<blockquote data-quote="Friesen009" data-source="post: 106703" data-attributes="member: 17366"><p>I had a copy of that and took the search a bit further (for anyone who may be looking in the future, here is my best guess so far). After doing searches on the Gehl 2500 and Ford CL20 which I believe to have run the same engine I came across the "Onan N Series Training Manual". It seems that sometime back in the 70s Onan's N series engine were all the same (except the N52M). They all came as 2 cylinder 4 stroke engines with a bore of 3.56", stroke of 3.00", and a compression of 6.5:1(NHA) or 7:1(NH, NHB, NHC) with 60 inches of displacement. The N52M was an odd duckling. It wasn't until later that Onan changed their model and serial system. This is where the B, P, and T models which I have been seeing for most parts lists come in. The B seems to stand for Basic (just guessing), the P for Performance (actually stated as such), and the T for something I am unsure. The B and P series seem to often times be lower HP engines with a different bore and stroke. Best that I could find is that older John Deere F930's ran an Onan which when cross referenced with the NHC from this manual had identical bore, stroke, displacement and HP. So I am guessing that the Onan T260 which was used in the John Deere F930's is an updated version of the NHC from the 70's. They may have some minor option differences, but are fundamentally the same engine. I have found a decent supply of parts for the T260 from Sears Parts Direct.</p></blockquote><p></p>
[QUOTE="Friesen009, post: 106703, member: 17366"] I had a copy of that and took the search a bit further (for anyone who may be looking in the future, here is my best guess so far). After doing searches on the Gehl 2500 and Ford CL20 which I believe to have run the same engine I came across the "Onan N Series Training Manual". It seems that sometime back in the 70s Onan's N series engine were all the same (except the N52M). They all came as 2 cylinder 4 stroke engines with a bore of 3.56", stroke of 3.00", and a compression of 6.5:1(NHA) or 7:1(NH, NHB, NHC) with 60 inches of displacement. The N52M was an odd duckling. It wasn't until later that Onan changed their model and serial system. This is where the B, P, and T models which I have been seeing for most parts lists come in. The B seems to stand for Basic (just guessing), the P for Performance (actually stated as such), and the T for something I am unsure. The B and P series seem to often times be lower HP engines with a different bore and stroke. Best that I could find is that older John Deere F930's ran an Onan which when cross referenced with the NHC from this manual had identical bore, stroke, displacement and HP. So I am guessing that the Onan T260 which was used in the John Deere F930's is an updated version of the NHC from the 70's. They may have some minor option differences, but are fundamentally the same engine. I have found a decent supply of parts for the T260 from Sears Parts Direct. [/QUOTE]
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Hydra Mac 8B Onan Identification
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