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Please Educate Me Between Onan B43G And Onan B48M Differences?


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#1 adolphsson09 OFFLINE  

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Posted January 29, 2014 - 02:23 AM

So heres the deal I have a B48M in my Snapper 1855a now and this guy has a B43G for sale. What I need to know is what are the differences between the two engines. He says his is an 18 hp engine and so is my b48m. If this engine is an easy swap out for mine (if) it should ever be needed I just may buy it. But if the differences are non compatible I wont do it. Im sure the seller will tell me whatever I want hear just to sell his. I need someone who KNOWS the differences to EDUCATE ME PLEASE Thanks Nick

#2 MH81 ONLINE  

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Posted January 29, 2014 - 07:35 AM

My original answer was wrong, so I deleted it.
I just found a spec sheet that says the 43 is 16 hp and the 48 is 18

2 less ponies, it seems.image.jpg

#3 KennyP OFFLINE  

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Posted January 29, 2014 - 08:04 AM

From what I have found, the only difference between a B43 & B48 is the stroke. B43(M&G) should be a 16 horse. You can see the stroke difference in the post above. Just pull a head and check it.



#4 TAHOE ONLINE  

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Posted January 29, 2014 - 08:51 AM

yep 16 to an 18, other than that, pretty much same motors. I think 1655's had the 43, 1855 had the 48.


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#5 adolphsson09 OFFLINE  

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Posted January 29, 2014 - 12:35 PM

This engine of his came out of a John Deere 318 and is the B43g The data I find shows that the motor used in the 318 is an 18hp Im confused here I know the b43m is a 16 hp just don't know anything about these engines that were in the john deeres

#6 KennyP OFFLINE  

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Posted January 29, 2014 - 04:28 PM

Maybe the 'G' designates an 18 horse?



#7 MH81 ONLINE  

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Posted January 29, 2014 - 07:17 PM

I hope an Onan guy shows up, but it's my understanding the 43 is a 16. That said, if it was in a 318, it's not the original.

#8 olcowhand ONLINE  

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Posted January 29, 2014 - 07:50 PM

B43G is 18hp, B48M is also 18hp with the B43M being 16hp.  Not sure on the differences between the 2 different 18 horse models, but should swap perfectly if cranks are the same size/length.


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#9 KennyP OFFLINE  

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Posted January 29, 2014 - 07:57 PM

I have searched many places for a manual for the 'G' models, but have not found anything. I think the Onan in 'Big Bertha is a B43G. The one FF has a B48G, which is supposed to be a 20 HP. The last one is a P220. They all look very much alike.


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#10 adolphsson09 OFFLINE  

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Posted January 29, 2014 - 10:55 PM

Thanks olcowhand for clearing up the confusion because it was the stock motor in the 318 is what the seller said

#11 dropped82 ONLINE  

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Posted January 30, 2014 - 10:15 PM

Check where the starter is mounted. Onan mounted the starter on either side depending on the engine model. Also some had solenoids on the starter and some didn't. Could cause clearance issues. All the Onan B's shared a lot of parts. Even the P series. Hope this helps.

Eric

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