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Replacing 18 hp opposed twin with 14 hp Vanguard?


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#1 Diesel1050 ONLINE  

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Posted June 28, 2015 - 03:10 PM

The opposed twin in my Agway GT-18 burns way too much fuel, doesn't run good, and needs a lot of work to be good again. I have a good running (Just needs starter) 1991 Vanguard 14 hp V-twin in a Bolens 1468 and was wondering if anyone had any opinions on the swap? Still want to run the shaft drive PTO off the electric clutch already on the motor. Is it worth doing the swap? How efficient are the Vanguards? How large of a deck or snowblower can I run?
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#2 Cvans ONLINE  

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Posted June 28, 2015 - 03:16 PM

As far as I know the Vanguards were a very good engine. How hard was the the 18HP being worked. The Vanguard may not have enough power for your mower. 


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#3 Chris11 OFFLINE  

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Posted June 28, 2015 - 05:06 PM

That 18 is a great engine. Im sure it will out last the vanguard.

#4 Diesel1050 ONLINE  

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Posted June 28, 2015 - 05:09 PM

No mower at the moment, want to run a 4 foot deck for brush. 18 is pretty much toast, was run hot too long. Has close to 2k hrs on it. Has major piston slop and will need a bearing.

#5 dodge trucker OFFLINE  

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Posted June 28, 2015 - 08:16 PM

what brand is the opposed twin? Horiz or vertical?



#6 Diesel1050 ONLINE  

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Posted June 28, 2015 - 08:30 PM

Briggs, Horizontal. It's not worth fixing as it has had a super hard life.

#7 stiemmy OFFLINE  

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Posted June 28, 2015 - 09:10 PM

Every person here will have a different opinion naturally, but ultimately in the end it's your decision what will eventually go in there. Myself, I'd try to stay around the HP that's in it, or larger. I could give an arms length long list, but 3 things that really stick out to me are, 1. you never see a person frown on a replacement engine that is big enough or bigger when you try to sell it. 2. It will decrease the value of the unit cause chances are a buyer wants that size tractor for the job to be done, and that's what the manufacturer designed it to do. 3. If it ends up going to work with a smaller engine it's going to be over worked, underpowerd, and the life of the engine will be shorter. Good luck on your engine hunt. Cheers!
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#8 Diesel1050 ONLINE  

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Posted June 28, 2015 - 09:14 PM

It is a hydro, so only needs a few hp to run the drive. It is a BIG tractor! Physically the size of a Deere 400. I want to use this tractor, but the absurd fuel consumption, and constant issues prevent me from doing so. It has a 3 pt, and will be used for plowing a garden, and snowblowing (4 foot single stage). Oh and I won't ever sell it. It is a fairly rare machine, and with a better engine will be able to do anything I want. I have a seperate mowing tractor so that's not a problem. The engine right now can't be putting out more than 14 hp, so personally I don't think it will be an issue but what do I know!

Edited by Diesel1050, June 28, 2015 - 09:15 PM.


#9 Diesel1050 ONLINE  

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Posted June 28, 2015 - 09:18 PM

Also, the newer versions of these had a 18 hp Vanguard and the pto works fine, also having the electric clutch engage the pto appeals to me greatly!

#10 Diesel1050 ONLINE  

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Posted June 28, 2015 - 09:33 PM

Another off topic question is if I were to put the snowblower (From Simplicity 3012 with its own pto) on my Bolens 1050, which has been repowered with a 10 hp Chinese Diesel, could I make a front pto by using a piece of pipe? Threaded and connected where the flywheel nut is, then run about 5" out, with a pully on the end to connect to the blower belt (factory has this pulley right off crankshaft) with a pillow block (would be connected to frame) as close to the inner side of the pulley as possible (know what I mean?)

#11 Cvans ONLINE  

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Posted June 28, 2015 - 09:57 PM

I've owned a good number of GT's with snow blowers. I've also converted several to diesel. From my experience your 10hp diesel will not pull a blower over 32 inches in deep snow at anything faster than a crawl. I replaced the 12hp diesel in my Kubota G4200 with a 21hp diesel and finally have enough power to make full use of it's 48" blower. Had a Simplicity 7117 with a newer 18hp  Kohler and could easily pull it down with a 36" blower. These were all single stage blowers or snow throwers. Take a look at walk behind blowers and the amount of horse power verses width of cut and then add to that the load required to drive your tractor. Hydros in the cold of winter can use quite a few more horses. 


Edited by Cvans, June 28, 2015 - 09:58 PM.


#12 Diesel1050 ONLINE  

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Posted June 28, 2015 - 10:01 PM

I have to disagree. Factory, this tractor had a 9.85 hp gas engine and was capable of running a 42" single stage shaft drive blower. It will be used at 3600 rpm in a low gear. I have no doubt that it would work fine, as I have used a case 222 12 hp and a 48" blower no problem. I just wanted to make sure I wasn't gonna overstres the crankshaft.

#13 Cvans ONLINE  

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Posted June 28, 2015 - 10:12 PM

I don't think your going to hurt that crankshaft as long as everything is straight and true. I have some here that have pulleys mounted on stub shafts mounted to the flywheel with no problems. How large a diameter is your shaft? 

Glad your have good results with your blowers. Blowing snow that has been packed by blizzards is tough. 



#14 Diesel1050 ONLINE  

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Posted June 29, 2015 - 07:42 AM

The crank is 1" I think? Now I thing I might make an adapter that bolts in the holes that once held the recoil start assembly. That supports the shaft (Which still bolts to the crank) about 1/2 way out and prrvents side to side motion of the shaft. The diesel is 10 hp, which is equivalent to a 16 hp gas. Plus if I find the blower is spinning too slow, I can always swap the pulley and belt.
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#15 skyrydr2 ONLINE  

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Posted June 29, 2015 - 08:45 AM

I don't care if its diesel or gas, there is no replacement for cubic inch displacement! Unless you tubo charge it.
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