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Engine Number?

M

Mpat70

Member
I have a D14 and the number on the torque housing is D14 21697. I know that this is the tractor serial number and am OK with it. Now to my confusion.... the number stamped on the engine just behind the carburetor is 15-8472-R. Can anyone tell me why the engine is stamped 15 instead of 14 indicating the model? Also, what does the "R" stand for? It's a gas G149 engine so I figured it should end with a "M".
 
The "15" means to me, it's a D-15 block at least, or maybe a complete engine. All D-15 gas engines have an oil filter like a PH-8A Fram type. D-14's are all like a WC-WD-WD-45 the cotton string filter with the metal tube that shoves up inside of it. The "R" I don't know, but there were only gas and LPG engines, not kerosene versions, and a compression test would verify which one of those it actually is. An engine block that came thru the Parts Dept for a repair, will never have a serial number on it, so you've either got a used block, or a complete D-15 engine. The oil filter type will be the clue to that dilemma.
 
Good question. A look at the tractor registry doesn't clear this up at all. If accurate- there are D15's listed with both 149 and 15 as engine number prefixes. On one page, there are several different suffix letters.(That might be on the D14 page)
I was going to suggest the R might mean standard compression, as opposed to high altitude/compression? But then what do all the other suffixes mean?
More questions. So was a high altitude/compression gasoline engine available? Would that have the same compression ratio as an LPG engine?
 
15 is prefix for a D15 engine, R is normal suffix for gasoline, I is suffix for higher compression LP engine.
 
above info applies to D15 Series I with G149 (prior to 1963) R suffix was 7.75:1, I suffix was 8.9:1. G149 in D14 with M suffix was 7.5:1 and there were distillate G149 with S suffix in D14. Engines I have seen starting 149 prefix were generally power units, and frequently power units had different suffixes from tractor use - but the G149 was used all over incl D10 and D12 series II with varying gas CR over time with differing suffixes. And obviously engines of this vintage may have been rebuilt and could have non-standard pistons and compression ratios.
 
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