720 engine options?
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=36684
Printed Date: 02 Aug 2025 at 11:04pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 720 engine options?
Posted By: plowboy8550
Subject: 720 engine options?
Date Posted: 04 Sep 2011 at 9:01am
|
My 720 has a bad carb and the cyl walls are scared so I need to repair or replace.. Small engine werehouse has a 23 hp briggs for 1800 but id rather have a little bigger engine and if possible a diesel. What have you guys seen or done?? Any ideas?
Thanks Matt
|
Replies:
Posted By: Tracy Martin TN
Date Posted: 04 Sep 2011 at 9:37am
| What model was the Honda engine people repowered with?That is what I want. Tracy Martin |
Posted By: Kcgrain
Date Posted: 04 Sep 2011 at 12:21pm
| I have both a 620 and 720 I want to repower, would like the honda although I have been told by the small engine people locally the Vangaurd engine is actually better and have had less problems with them than the honda, and as I understand it is either a copy or it is built in Japan, have thought about the diesel option but after looking and driving some small diesel lawn tractors, I am not going to pursue it they shake to much, are noisy and small diesels do not perform like there gas counterparts. So it looks like its going to be the Vanguard for me would be neat to do a honda and a vanguard just to see which one is better. |
Posted By: SHAMELESS
Date Posted: 04 Sep 2011 at 12:33pm
| the small diesel in my AC 920 is powerful! |
Posted By: Kcgrain
Date Posted: 04 Sep 2011 at 12:39pm
| how many cylinders? shake? noise? make? I am still curious about the diesel but like I said the ones I have seen dont turn my crank ......yet. |
Posted By: SHAMELESS
Date Posted: 04 Sep 2011 at 12:46pm
| KC...it's a "lambordini" engine, came from the factory that way. and i'd hafta look as to how many cyl's, i can't remember right now. either 2 or 3 i think! i'll let ya know!l. and parts are readily available on this engine! even in omaha,ne! |
Posted By: Orange Blood
Date Posted: 04 Sep 2011 at 12:46pm
|
look on eBay, there is often a Honda Repower kit available for the 620/720 engines. ------------- Still in use: HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060 Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7 |
Posted By: SHAMELESS
Date Posted: 04 Sep 2011 at 12:48pm
| sorry..i hit the button before answering the rest of your ??'s...has a shake upon startup, then smoothes out, is very quiet ( has a short muffler) , my wife drives it, she loves it! |
Posted By: Kcgrain
Date Posted: 04 Sep 2011 at 12:48pm
| air cooled water cooled I heard if you put the diesel water cooled in you have to put them in with the radiator in back is that how your is? |
Posted By: Orange Blood
Date Posted: 04 Sep 2011 at 12:49pm
|
Or here is a vanguard option
http://www.ebay.com/itm/23hp-Briggs-Vanguard-fit-Onan-Allis-Chalmers-620-720-L-/200647308202?pt=LH_DefaultDomain_0&hash=item2eb782f3aa - http://www.ebay.com/itm/23hp-Briggs-Vanguard-fit-Onan-Allis-Chalmers-620-720-L-/200647308202?pt=LH_DefaultDomain_0&hash=item2eb782f3aa ------------- Still in use: HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060 Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7 |
Posted By: Coke-in-MN
Date Posted: 04 Sep 2011 at 12:49pm
|
I used the V Honda to replace the K341 Kohler 16 HP in my New Holland S16.
Same engine in Honda is rated from 18 to 27 HP , so unsure of what they change in it to up the HP. Might get some ideas from this link
http://www.smallenginewarehouse.com/ - http://www.smallenginewarehouse.com/
Another link to 720 repower
http://www.smallenginewarehouse.com/RepowerItems.asp?Brand=Allis%20Chalmers&Model=720 - http://www.smallenginewarehouse.com/RepowerItems.asp?Brand=Allis%20Chalmers&Model=720 ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: wjohn
Date Posted: 04 Sep 2011 at 12:50pm
|
If I recall correctly, Lombardini is connected to Kohler. They use those diesels on walk behind tractors and they seem to be good little engines. The walk behind engines are air cooled. I don't know about the larger ones. ------------- 1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45 |
Posted By: SHAMELESS
Date Posted: 04 Sep 2011 at 12:52pm
| mines air cooled, i have seen ones with radiators hanging on back, i wouldn't think that would be a good thing! i have also seen kabota liquid cooled engines on AC garden tractors! |
Posted By: SHAMELESS
Date Posted: 04 Sep 2011 at 12:53pm
| yeah..wjohn spelled it right! |
Posted By: SHAMELESS
Date Posted: 04 Sep 2011 at 12:54pm
| grasshopper mowers also use the kabota diesels in them! |
Posted By: Kcgrain
Date Posted: 04 Sep 2011 at 12:57pm
| Dang you guys now I got to rethink this again!!!!!!!!!!!!! Although with 2 could make one diesel and one gas, the 620 came with a tall ag tire should put the diesel in that one w dual on, now that would be wicked |
Posted By: BrianC,Ont
Date Posted: 04 Sep 2011 at 12:59pm
|
At one time I was thinking of putting a Kubota 3 cyl gas engine in my 720. ------------- 35WC on steel, B with belly mower, D17 puller, D15 Series II puller, D15 Series II with loader, 608 Lawn Tractor |
Posted By: plowboy8550
Date Posted: 04 Sep 2011 at 1:08pm
| I was told that the new hondas use a positive ground now, thats why you dont see them in the conv kits anymore.. Im just thinking that about 30 hp would be ideal and turn it into a mowing machine.. Its hard to tell what hp ive got now but i would guess around 10 so anything will be a drastic improvement.. When you mow with a very weak engine and have to go so slow you cant help but daydream about going 7mph cutting grass. :) |
Posted By: Coke-in-MN
Date Posted: 04 Sep 2011 at 1:12pm
|
Seen the small V Honda engines used in cycles and are said to be putting out 45+ HP with some small modifications.
As far as polarity of charging system that is a small problem that isn't a problem . All my British motorcycles are + ground. ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: Dale H. ECIL
Date Posted: 04 Sep 2011 at 9:06pm
|
I put the Honda 24HP replacement from Small Engine Warehouse 4 or 5 years ago in my 620 and have not regretted it one bit. It has not used a drop of oil and uses at least 1/2 the gas as the Onan engine. It has more power than the Onan and the deck belts will slip before the engine pulls down.
------------- Allis Chalmers Museum, Paris, Il.http:// www.allischalmersmuseum.com 217-275-3428 |
Posted By: injpumpEd
Date Posted: 05 Sep 2011 at 8:40am
------------- 210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers! |
SHAMELESS wrote: