(800) 853-2651
SHOP NOW

Farmall 706 Gas - lost compression

A

Anonymous-0

Well-known Member
I used the 706G on the round baler this past weekend with no issues, made 55 bales. Coming home I thought I noticed a bit of a miss but it's been known to foul a plug occasionally, so I didn't think much of it. Went to start it today and it fully misses on #2. Pulled plug and it is brownish gray, not fouled. Did compression check and #2 is 20 psi. I last checked compression during tuneup in March and it was 105. So....either a stuck valve or a hole in the piston. I'm hoping a valve - the tractor is supposed to have M&W pistons in it. Oil pressure holds well at 38 psi and temp runs just below 190.

Which one do you guys think it is going to be, valve or piston, before I open her up?
 
Could also be as simple as need to adjust the valves. As an engine gets older then valve move up and that closes the gap between the rocker arms and the valves so it is possible for you the have a simple valve out of adjustment and that would in fact lower compression
Hobby farm
 
Put the #2 at its TDC on the compression stroke. Lock the brakes in high gear. Put air pressure in the cylinder (20 psi) and figure out where the air goes by listening for the leak in the oil fill hole, air intake, and the exhaust stack! It will show up. JimN
 
Pull the valve cover and watch the valves on No2 to see if the stems and rockers are moving at an idle. Could have a bent push rod. Hal
 
A good way to check the exhaust valve is to rev the engine up and shut the key off. If a valve is burnt you will hear it spittin as the engine coasts to a stop.
 
Well two things here that i am betting on , 1 ya have a burnt valve and 2 that compression is WAY off what it should be so now is the time to do it wright .
 
You must log in or register to reply here.

Similar threads

3
IH backhoe 3444 ?'s
Replies
2
Views
159
bc
B
J
WC compression
Replies
6
Views
596
Butch(OH)
Butch(OH)
L
TEA20 compression
Replies
7
Views
505
Steve@Advance
S
J
1750 Gasoline, Compression Check
Replies
4
Views
392
Jon Wescott
J
G
Farmall H C152 piston ring help
Replies
11
Views
404
Highwayman
H
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