Jump to content

Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

Briggs engine question


SimpleTom

Recommended Posts

a 23 is a different block and head as the 19 as you probably know. as far as cube in I can not tell you, I'm not an engine builder specialist. it's easier just to find a larger engine and would probably last longer to. I have been buying grain augers for next to nothing and using the engines off of them, 16+ hp. $100.00 and down. taking the rest and scraping it.
Link to comment
Share on other sites

Yes, I know it is different. What I'm looking for is the physical size of the engine. Would a 9 hp fit on the frame and under the hood of a 725 without modifications? Tom
Link to comment
Share on other sites

I think the stroke(vertical height) is the same but not completely certain. The 23D and 243431s are the same stroke and external dimensions, difference being the 3" bore(9hp) and 3.25" bore(10hp). The baseplates are identical and the sheetmetal is identical as well between those two. As far as I know, the base chassis is the same from the 725 on up through the short wheelbase units. You may have to check the driveshaft alignment however. I seem to recall a height difference which required shims of some sort to make it straight.
Link to comment
Share on other sites

They are not a direct swap. The model 19 stands several inches shorter in overall height, the big difference is when you compare oil pans and blower covers. The 700/725 do not have a hole in the frame to accomodate the larger diameter blower cover of the 9hp and larger engines. I believe you would have to drill some different engine mounting holes as well.
Link to comment
Share on other sites

the answer is yes you can. here was the one my brother gave me he bought it like this. this is po's mod.


the oil filler tube is in the way if you want to swap grill supports I'm game. there are other problems, but I don't recall any shims under the engine to raise it up. the 19 is shorter then the 23 in size. I will look at the chassis tomorrow I have seen and have a shroud that has been cut out at the bottom as well??? I can't remember where it came from ie which tractor.
Link to comment
Share on other sites

I have an early Wards Squire same as a Simp 725 or AC B1 I put a 243xxx 10 Hp Briggs in. Had to cut in a notch in the bottom of the frame for the engine blower housing to clear. Look at the bottom of a B 11x or b21x series tractor. The opening needs to be about 5 inches wide and cut about 1 1/2 inches toward the front of the tractor on each side... |____|. Note: may nifty little pic is from the seat looking towards the front, do your own measuring as I guessed at how big I had to cut it. Drilled 2 holes cut through with a sawzall and pushed down with block of wood and 4lb hammer so blower shroud would clear. I would not cut a big hole with a torch. Some of the 100 and 200 series have an angled piece under each front mounting hole of oil pan to level out the motor they are 1/4 inch thick. I had no problem with crank drive shaft alignment on mine, no shims needed. Put a short level on front of crankshaft to see if shims are needed. It should be level. You may have to switch generator pulleys or drive shaft couplers depending on what is on the motor you are putting in. I did not have to modify anything else. Good luck on the conversion it is real easy just think about it and survey the situation before you start the saw.
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...