(800) 853-2651
SHOP NOW

TEA 20 Fuel problem

A

Aus.Steve

New User
:? Hi, I'm new to group so not sure if this has been covered.
I am having trouble getting my TEA 20 to run properly.
It has the Zenith carby which according to the manual I downloaded should have the slow running mixture screw set at 1 to 1&1/4 full turn from closed and the main jet set at 1 to 2 full turns, depending on workload. These are the settings I have always used.
I recently had to strip the carby down due to impurities causing the needle and seat to stick open and flood the carby. As the gasket had deteriorated severely i had to form a silicon gasket. After this the tractor ran better than it ever has for several hours on different occasions in the several years I owned it.
However it recently started missing severly and blowing a lot of black smoke and the main jet can only be set at about 1/8 of a turn at idle before excessive smoking and stalling occurs and needs to be adjusted to 1/4 to 1/2 of a turn at high revs. any more and it runs rough.
I'm wondering if a breach has occurred in the gasket causing a cross over of fuel between the main and slow idle jets.
Appreciate any feedback
 
I can"t imagine using silicone to make a gasket in that area. Too much to go wrong- maybe a gob floated into the wrong area? Cut a new gasket using paper, maybe paper from a manila folder? or similar thickness. Not too hard to outline one and cut it out. Tap the paper with a small ball pein hammer to locate the inner cutouts.
 
Hi Steve, you may find the correct gasket on Bareco in Australia. I use a Vapormatic kit on mine. Check for sticking float or needle valve. These cause fuel to leak into the intake from the air cleaner.
 
Steve

Might be more than one Zenith carb then - I think ours is 2 on the main jet and about a half on the idle. And the idle works in reverse - out is leaner.

When in doubt look at the part book which I just did - there are two, the second used after engine No SC9379SE.

Does your main jet have a pin through it and is horizontal at the bottom (if so early) or a knurled knob with a spring under it and an insert like a rivet head in the knob as a marker that goes down at an angle from the top (late)

And by the descriptions you're getting too much fuel in somehow and I don't think it will be that gasket.

More sh1t in the float valve?

If so have you got a screen in the sediment bowl under the tank? The later carb also had a screen in the banjo where it bolts to the carb (might even have been one in the banjo at the sediment bowl too) but I can't see one listed in the earlier Zenith carb which I'm presuming you have.
 
(reply to the needpost at 20:33:39 01/02/16)
Click to expand...
Cheers Majorman. I found that when the float sticks it usually floods back into the inlet pipe which it isn't doing now. But will check it out just in case.
 

Cheers Ian. The main jet doesn't have a pin through it . It has the knurled nob with what looks like a blob on it as a position indicator. No spring that I'm aware of. The fuel bowl has the gauze filter and I've just put a brand new tank on it last week. No gauze filter in either end of the flared fuel line. There may have been a bit of dirt still in the line which might be partly fouling the float. Will check it out once I've got a new gasket.
 
With a silicone gasket, and good running for a little while, it could be the gasket failed only into engine vacuum at the throat, in which case it could be picking up gasoline by pulling a vacuum on the fuel bowl.
 

Gas eats silicone.

Take it apart, clean it/blow it out, make your gaskets out of gasket paper.

Gas eats silicone.
 
Silicone is attacked by petroleum. Very likely your problem is due to the gasket failing due to exposure to petroleum - as in gasoline. Gasoline causes silicone to swell, get soft, and generally deteriorate. As others have suggested, either make or obtain a correct paper gasket.
 
Thanks for the advice fellas. Sounds like I stuffed up by using the silicone. Being automotive silicone I thought it would be ok. Won't make that mistake again.
 
You must log in or register to reply here.

Similar threads

D
1963 Ford 4000 Gas carburetor trouble. Any suggestions??
2
Replies
27
Views
726
DLPinnix78
D
D
1947 Ford 2N searching for steady rpm at Idle?
Replies
8
Views
239
Dwd14329
D
K
Jacobson G10 Help
Replies
6
Views
402
mhb@ufe
M
R
Alternator Confusion, Positive Ground
2
Replies
29
Views
1K
used red MN
U
L
450 carburetor
Replies
4
Views
307
Lynerd
L
Tractor Parts Tractor Manuals

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.

Copyright © 1997-2024 Yesterday's Tractor Co.

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.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top