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Discussion Starter #1
I have located a 1984 Work Horse GT1800 for sale. It looks to be in good shape and a reasonable price but has a blown engine B&S 18HP Twin (V?). The owner has looked for a replacement engine on the web and through a "dealer" and says a replacement is not available due to the PTO/Accessory Drive pulleys installed. And is selling it only because he cannot find an engine.

With all the engine types made and this being a 1984, I'm surprised an engine cannot easily be found to replace the original. Not familiar with these tractors other than their reputatation, can anyone tell me if another engine can be installed in its place without too much trouble? Or if the dealer is incorrect and a direct replacement is out there?

Any information is appreciated.

mit678
 

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Here's the link to the PartsTree page for the original engine. Unless the block is trashed you should be able to have it rebuilt at a local machine shop. Also, I will look into the original engine specs and see if a direct replacement engine is available. A word of warning though. Rebuilding, if you can is the way to go, as a new engine is not going to come cheap.

http://www.partstree.com/parts/?lc=Briggs+and+Stratton&mn=422437-0663-01

Correct me if I am wrong but I believe your engine has the following spec's:

18 HP Opposed-Twin
1" dia. output shaft
2-29/32 Shaft Length
1/4" Keyway
Shaft is tapped 3/8-24

The only other dimension you need to worry about now is that the center-line of the shaft is in the same relative position from the mounting bolts as the old one. There may be some modifications involved, but an engine can be made to fit well with a little skill. All depends on how mechanically "handy" you are.
 

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Discussion Starter #4
Thanks for the responses. I do not have the engine info/specs and was hoping it was a fairly generic configuration that year. I figure someone has replaced one of these engines and would like to learn how they handled it.
 

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What type of damage did the original engine experience?

Here's the links to the two manuals for the original engine (Model: 422437-0663-01):
http://www.mywheelhorse.com/graphics/file/Engines/B&S_420000_274795-DOMESTIC_LO_OM.pdf

http://www.mywheelhorse.com/graphics/file/Engines/B&S_420000_MS7634_LO_IPL.pdf

Crankshaft dimensions:
http://www.smallenginesuppliers.com/html/engine-specs/briggs/Briggs_421400_422400.pdf

Replacing an Engine
• Compare the overall engine size to avoid possible mounting interference
• Match the crankshaft
- Diameter “A”
- Height “B” (distance from base to crankshaft center line)
- Length “C” (distance from oil seal/cover’s mounting face to end of crankshaft)
• Match the crankshaft type, i.e., keyway, tapered or threaded
• Match the crankcase cover’s tapped holes for mounting accessories (if applicable)
• Match the base mounting dimensions and bolt hole spacing
 

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Should be a gt1848. This is the same frame/ sheet metal as the rest of the WHs. You can put anything from a 10hp to a 16hp kohler and the 17/19 kt's also the 18/20hp magnums as long as they have the WH spec pto's and oil pans. Pto's need to be either 1" or 1 1/8" dia. and approx 3 1/2" in length and the singles need the deep oil pan. Depending which ign. you get if its point you'll need to change the ign switch and the wiring a little and if not a direct fit.
A lot of engines to choose from. If you get a engine with the 1 1/8 dia. pto pulleys are allways on evilbay, and for wiring diagrams once you decide on a engine just find a WH model that came with it and use that wiring diagram to hook it up.
Ooops forgot you can also put the single briggs on them, dont know the exact conversion needs but they came with them also.
 
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