Universal M3-20 diesel equivalence

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cadams

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Nov 12, 2009
18
Catalina 30 Bear Lake
I may buy a Catalina with a rebuilt Universal M3-20B diesel. I am trying to find out two things. First, what is the difference between the Universal M3-20B and the M3-20A. More importantly, which Kubota diesel is the "equivalent"?

Thanks in advance for any help you can provide.
 
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C

cadams

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Nov 12, 2009
18
Catalina 30 Bear Lake
Jack, thanks very much!
That shows the difference between the M3-20 and M3-20B. Much appreciated (and kinda glad I have the 20B with a bit more HP).
Anyone know the Kubota diesel equivalent?
 
C

cadams

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Nov 12, 2009
18
Catalina 30 Bear Lake
Still don't see it in the link. It shows: "The Model M3-20, a 38.9 cu in, 18 hp, 3 cylinder, based on the Kubota D-640 block, was built from 1988 to 1997. Approximately 525 were sold. The Model M3-20A, a 3 cylinder engine producing 13.4 kW / 18 hp at 3,600 rpm , based on the Kubota ?? block, was introduced in 19??." and " Universal models available in 1998, the 100 year anniversary of the first Universal motor, were the 3 cylinder M3-20B (20 hp) and M25-XPB (26 hp), and the 4 cylinder M-35B (32 hp) and M-50B (42 hp), all Kubota based light diesels converted to marine specification and fitted with integral heat exchangers and Hurth transmissions."
Still no equivalent model number for the M3-20B. Do you think the M3-20B is built on the same block as the M3-20 (Kubota D-640 block). I may be missing something, but it is a bit of a mystery. Thoughts?
 
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