Posted by Tom Fleming on December 31, 2010 at 12:00:31 from (67.20.243.240):
In Reply to: cub won't start posted by jeep 258goat on December 30, 2010 at 16:03:12:
ok, let's make a short laundry list here. First, Jeep said he rebuilt this thing, so my assumption is that the crank was out, the cam was out, distributor was out, etc. so, let's start here:
1.) check compression. all cylinders should register close to the same pressure. If the CAM is timed right, and the valve lash is right, then there should be decent compression. No compression, then there is a valve issue (timing or lash).
2.)Check spark at TDC on number 1 and timing order (wiring). If the rotor is not at 1:00 when #1 is at TDC, then there is a timing issue with either the distributor/Mag gear or the distributor itself. Also, are the wires on in correct order 1,3,4,2 starting at 1:00 on the cap, and going clockwise.
3.) vacuum. If the valves are timed right, and there is compression, then is the manifold leaking or anything else in the fuel supply path (carb, manifold).
4.)Fuel delivery. fuel may be going to the carb, but is the carb delivering fuel. Best way to check very quickly is with the air cleaner hose off, and a helper running the starter, spray some ether into the intake on the carb while cranking. if it fires then dies, you have a fuel delivery problem in the carb. BTW, this test should be done AFTER determining that the timing and firing order are correct. you really don't want to be spraying ether into an engine that may backfire.
If you go through all these steps, and she still won't run, then I am stumped. (that is based upon the fact that you state you have good spark at the plugs.)
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 - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
... [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.
