Boreand Stroke

fastfarmall

Well-known Member
I am getting pretty interested in that old L.A. what is the bore and stroke, and what RPM does it run? Does't seem to be any pistons or rings available It's not that this one needs work ! Is that a 5 main bearing engine?
 
Let me try that last post again: My parts book shows three main bearings. (I have only heard of one broken crankshaft in my 68 years; it was a neighbor of ours and dad sold him a shaft out of an engine that had frozen and broke the block.)
 
Don't want to start a war but my factory shop manual, dated March 1948, shows bore @ 4 5/8th Stroke @ 6 and full load 1100 rpm. max no load is listed @ 1200 rpm
 
These guys are correct. 4 5/8 bore and 6 inch stroke. Toughest tractor built by Case. I worked them really hard.
Richard in NW SC
 
Forgot. 1100 RPM at load. Ran a sawmill for years with an LAE and used an LA tractor to work the farm.
Richard
 
I looked up the displacement in my manual and it was 403 cubic inches. The only tractor I am aware of that topped that during that era was the Oliver 99 with 443 cubic inches. The engine was 4 3/4" bore and 6 1/4" stroke. I would love to see these two tractors go head to head. They had about the same hp.
 
Thanks proud vet, i seen this one at our local threshing day's it been almost 30 yrs ago, when they would threw in to many bundles, it would open the govenor a tad !
 
i have a early Oliver model 99 with a 4 cylinder continental engine that I take to shows. I will say that it is a lugging machine however, it is a pain to crank and start, not like a case. I will take the LA over the 99 any day.
 
My 99 is a 1951 model with electric start. I don't know when exactly the 99 came out but I have a brochure from 1940 stating it was the most powerful tractor on wheels and rated it a 5 plow tractor.
 

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