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Dave H 
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Joined: 11 Sep 2009
Location: Central IL
Points: 3603
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 Topic: Repowering My MTD
Posted: 6 hours 53 minutes ago at 7:04pm |
No need to get into why the current engine is toast. 
Anyhow I really like this lawn tractor. It came with the twin cylinder opposed motor. Finding a replacement motor of that vintage has proven like impossible so far.
Does anyone know of a replacement engine chart that says what else besides my dinasour cousin will fit the mounting, shaft, ect.
I don't care about the motor fitting under the sheet metal. This thing has beening running around naked for some time. thanx
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 25131
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Posted: 5 hours 54 minutes ago at 8:03pm |
Assuming it's a B&S , drop in a V-twin ! , they run smoother than the opposed, should fit fine.Wiring is the same. LOTS of 'dead ' riders with vtrins in them for sale, anything from 16 to 24 HP will work for you.
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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Dave H
Orange Level
Joined: 11 Sep 2009
Location: Central IL
Points: 3603
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Posted: 5 hours 13 minutes ago at 8:44pm |
Jay, Thanks for the reply, are you indicating that the crank shaft diameter and length are about all the same. That is what has me befuddled. Like I indicated fitment on the deck of the chassis and crank has me in a tissy. 
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AllisFreak MN
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Joined: 07 Dec 2009
Location: Minnesota
Points: 1616
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Posted: 4 hours 44 minutes ago at 9:13pm |
This thing has beening running around naked for some time. thanx
Sounds like a girl I once knew...
Edited by AllisFreak MN - 4 hours 42 minutes ago at 9:15pm
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'49 A-C WD, '51 A-C WD, '63 A-C D17 Series III, 1968 A-C One-Seventy, '82 A-C 6060, '75 A-C 7040, A-C #3 sickle mower, 2 A-C 701 wagons, '78 Gleaner M2
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Dave H
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Joined: 11 Sep 2009
Location: Central IL
Points: 3603
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Posted: 3 hours 58 minutes ago at 9:59pm |
Allis, you lucky dog. 
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 90414
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Posted: 2 hours 2 minutes ago at 11:55pm |
Dave... you can find the shaft dia and length on line.. I assume you have the old 18 HP opposed 180 degree twin.. The came in a vertical and horizontal option... The newer engines are the same, both options...(Remember, some of the HORIZONTAL shaft engines have a shaft sticking out both ends for the DRIVE on one end and the PTO / mower belt on the other...) They also advertise the shaft diameter and length.. I have found most are comparable, as long as you dont try to put a 25 HP motor in a 18 HP tractor..... Jus compare what you have now to the new.. I know you want a YES- NO answer, but some of this depends on what engine you chooses..
this is what GOOGLE says.........
Briggs & Stratton 18HP Opposed Twin Engine Crankshaft Specs422707 model often faces engine replacement challenges and crankshaft compatibility issues during upgrades. The Briggs & Stratton 18HP opposed twin engine (model 422707) typically has a crankshaft diameter of 1 inch and a length around 3.5 inches. When replacing the engine, matching these dimensions is crucial for proper fitment with the mower deck and transmission. Measure the existing crankshaft carefully, including keyway size and position. Also, verify mounting bolt patterns to ensure compatibility. Proper alignment prevents premature wear and ensures smooth operation after replacement.
Edited by steve(ill) - 1 hour 45 minutes ago at 12:12am
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Like them all, but love the "B"s.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 90414
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Posted: 1 hour 60 minutes ago at 11:57pm |
NOTE the SPEC ... gives shaft size...
the new engines will all be overhead cam and have oil filters .. both improvements over the old 160 18 HP opposed twins.
Edited by steve(ill) - 1 hour 56 minutes ago at 12:01am
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Like them all, but love the "B"s.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 90414
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Posted: 1 hour 48 minutes ago at 12:09am |
here is another version... NOTE the shaft is 1-1/8 instead of 1 inch... so you have to VERIFY as they make a couple different sizes..
Edited by steve(ill) - 1 hour 44 minutes ago at 12:13am
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Like them all, but love the "B"s.
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