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John Deere 70 Lawn Tractor Engine


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#1 jdslednut OFFLINE  

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Posted February 17, 2010 - 09:58 PM

I have a 70 but like most the Tecumseh engine is shot with a crank worn way over specs. Has anyone retrofitted another engine on the 70 that can still operate the deck and blower with the weird PTO clutch the Tecumseh had? Anyone retrofitted an electric clutch to work with Briggs? Looking for any idea here that wouldn't break the bank.

#2 Guest_hooligan_*

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Posted March 02, 2010 - 09:58 PM

I don't see why you couldn't use a kohler or briggs as long as the pulley fit on the shaft, I saw a 8 hp kohler on a MF-8, looked good

#3 jdslednut OFFLINE  

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Posted March 02, 2010 - 11:02 PM

The shaft is the problem. First of all, it is a vertical shaft engine and I believe Tecumseh only made this model for the 70 and a few Snapper rear engine riders but the Snappers I think used a different crank. Driving the tranny would be easy - just a pulley but to drive the deck or blower a conical friction type clutch is used (I think conical would be the right word). The crank needs to step down in size and I don't remember the mearurements off hand but they're odd. Thank you for the ideas. Unfortunately I don't think it is that simple. My other thought is to heck with the blower and deck and get a push blade for it! Seems though as everyone else has this thought too.

#4 Guest_hooligan_*

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Posted March 03, 2010 - 07:59 AM

Yeah after I posted, I remebered the 70 model was probably a vertical shaft, since it was made as a true Lawn tactor, get a blade keep it simple, you'll lie awake nights trying to figure it out, I'm already doin that

#5 Pa Plow Day OFFLINE  

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Posted April 08, 2010 - 08:08 PM

it shouldn't be too hard to find another engine to swap out cheap. it won't be new, but i'm sure it won't be hard to find. look at the john deere 60 too, a lot of times they were swapped from a 6hp to a 7 hp.

#6 Shawn OFFLINE  

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Posted May 06, 2010 - 09:48 AM

A friend of mine is having te same problem, trying to find a repower, or an original replacement.

#7 03rsixer OFFLINE  

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Posted May 03, 2011 - 09:12 PM

I have a 70 and ended up rebuilding the engine. For the crank, I ended up having is welded and ground back to std. and bought a new rod. It wasn't cheap, but I wanted to keep it all original. Another option is a V70 instead of the VH70. It's the aluminum version and a little easier to find.

#8 grnspot110 OFFLINE  

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Posted May 03, 2011 - 09:25 PM

To use a Briggs (w/deck) you'll either have to re-work the clutch or the crank. I did this instead;

Used an 8HP Briggs from a JD, R72 RER in my 60 lawn tractor to make the L/60 "Custom"! Takes a little frame trimming, but not too difficult. ~~ grnspot

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  • GARDEN TRACTORS 573 (Custom).jpg


#9 Gary400 OFFLINE  

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Posted May 04, 2011 - 07:24 PM

is it possible to take it to a machine shop and have it built up and turned down to the spec size ? i dont know if its a foraged or cast crank but ether way i would think it can be fixed and most likely cheaper than getting a new engine or crank

#10 jdslednut ONLINE  

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Posted May 04, 2011 - 07:26 PM

I have found a crank that isn't wore as much and may try it. It's only a couple thousandths under spec compared to the .012 the original one is. I won't run it hard for anything so it should (hopefully) last as long as I have the little beast.

#11 Gary400 OFFLINE  

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Posted May 04, 2011 - 07:30 PM

hope it works out for ya good luck

#12 middleageddeere OFFLINE  

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Posted May 04, 2011 - 07:42 PM

I love how those 60's and 70's looked like mini full size tractors. I hope you get her running.

#13 chris597 OFFLINE  

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Posted May 04, 2011 - 10:40 PM

I wanted a 70 until I read about the engine!

#14 chris597 OFFLINE  

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Posted May 04, 2011 - 10:40 PM

Does the 100 have the same engine?

#15 jdslednut OFFLINE  

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Posted May 04, 2011 - 11:53 PM

100 has a Briggs 8 Horse.




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