Posted by Spook on November 26, 2014 at 06:52:17 from (99.108.197.221):
In Reply to: OT--gasoline engines posted by Jiles on November 25, 2014 at 20:34:40:
I spent 35 years building engines at GM. I did programming and setup on gages, and worked as a supervisor at a dyno facility, among other things.
Matierals have changed comepletely over the years. Todays bore liner is made out of powdered metal, as are most rods, and some camshafts. Most crankshafts are now forged. The powdered metal parts are very tough, almost like a carbide, they resist wear very well, and are hard all the way thru, not just surface hardened like many steel parts.
Tolerances: Engine parts today are made to incredible tolerances. A crankshaft that might have had a diameter vtolerance of +/- .0015 (+/- .037 mm ) might have a tolerance of +/- .001 mm today, a reduction of over 90%.
In house repairs: When I started, every production area had repair loops, to fix things that had not been done right the first time. In the mid 90's, these all got torn out and scrapped. No repairs are allowed. If a engine isn't perfect, it gets thrown in the scrap bin. If things aren't right, production stops in a hurry. Nothing is made until things are 100% right. This drove warranty down to almost nothing.
Fuel injection: Big improvement, no fuel washing the lube out of the cylinder walls, contaminating the oil.
There are probably things I don't know about, or can't remember, but this what I can think of, right now.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
... [Read Article]
Latest Ad:
2022 John Deere 5045E, 4wd, front end loader and 3rd function with grapple. 120 hrs, 55k new, must sell
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
