| Author |
 Topic Search  Topic Options
|
KD8NGV 
Bronze Level
Joined: 03 Oct 2010
Location: Ohio
Points: 178
|
 Post Options
 Thanks(0)
 Quote  Reply
 Topic: Allis-Chalmers G Project Questions
Posted: 30 Mar 2012 at 3:20pm |
I am working on my newly acquired G. The one thing I noticed is there is a pipe facing downwards coming out of the Valve cover. What is this and what does it mean if there is something coming out of it while running? Thanks, Kevin
|
 |
|
Sponsored Links
|
|
|
Roddo
Orange Level
Joined: 16 Jul 2010
Location: Brant, Ontario
Points: 466
|
Post Options
Thanks(0)
Quote Reply
Posted: 30 Mar 2012 at 3:30pm |
Its just a crankcase vent. Usually if you have oil slobbering out of it that means you have a bit of blowby in your engine.
|
|
KD8NGV
Bronze Level
Joined: 03 Oct 2010
Location: Ohio
Points: 178
|
Post Options
Thanks(0)
Quote Reply
Posted: 30 Mar 2012 at 5:03pm |
|
It is pushing out a vapor of sorts... What would that mean?
|
|
Burgie
Orange Level
Joined: 13 Sep 2009
Location: Scottsburg, IN
Points: 1192
|
Post Options
Thanks(0)
Quote Reply
Posted: 30 Mar 2012 at 6:18pm |
|
|
|
"Burgie"
|
|
Burgie
Orange Level
Joined: 13 Sep 2009
Location: Scottsburg, IN
Points: 1192
|
Post Options
Thanks(0)
Quote Reply
Posted: 30 Mar 2012 at 6:20pm |
|
Kevin, There is a picture of that half scale G.
|
|
"Burgie"
|
|
JoeM(GA)
Orange Level
Joined: 12 Sep 2009
Location: Cumming,GA
Points: 4815
|
Post Options
Thanks(0)
Quote Reply
Posted: 30 Mar 2012 at 7:41pm |
|
kevin, check your messages
|
|
Allis Express North Georgia
41 WC,48 UC Cane,7-G's,
Ford 345C TLB
|
|
KD8NGV
Bronze Level
Joined: 03 Oct 2010
Location: Ohio
Points: 178
|
Post Options
Thanks(0)
Quote Reply
Posted: 01 Apr 2012 at 5:56pm |
That's a nice lloking half scale!!
What would that vent pushing out a vapor of sorts mean?
|
|
Burgie
Orange Level
Joined: 13 Sep 2009
Location: Scottsburg, IN
Points: 1192
|
Post Options
Thanks(0)
Quote Reply
Posted: 02 Apr 2012 at 6:02am |
|
Could be worn rings or cylinder bores.
|
|
"Burgie"
|
|
KD8NGV
Bronze Level
Joined: 03 Oct 2010
Location: Ohio
Points: 178
|
Post Options
Thanks(0)
Quote Reply
Posted: 02 Apr 2012 at 10:48am |
Please excuse the green behind my ear.... How might I go about checking that? I assume I need to take the head off the tractor, but how do I check the rings and bores? Do I look for slop? Or what?
Thanks guys?
Kevin
|
|
Gary in da UP
Orange Level
Joined: 13 Sep 2009
Location: EUP of Mi.
Points: 1885
|
Post Options
Thanks(0)
Quote Reply
Posted: 02 Apr 2012 at 10:59am |
|
Inspect the plugs, do a compression test. Start there and post the results. In the meantime get manuals for your tractor.. You need them.
|
|
KD8NGV
Bronze Level
Joined: 03 Oct 2010
Location: Ohio
Points: 178
|
Post Options
Thanks(0)
Quote Reply
Posted: 02 Apr 2012 at 11:01am |
|
I have all of the manuals for the tractor, I'll refer to them as I tear her apart. Ill take a look at the plugs tonight. Compression tested by thumb test or do I need a set of gauges?
|
|
JohnCO
Orange Level
Joined: 11 Sep 2009
Location: Niwot Colo
Points: 8992
|
Post Options
Thanks(0)
Quote Reply
Posted: 02 Apr 2012 at 11:12am |
|
KD, You can get a compression gauge at most any store selling auto parts, shouldn't cost much more then ten bucks for a simple one. You really need an accurate number on each cylinder, should be around 120 PSI as I remember. If one cylinder is quite a bit lower then the others, that might suggest a leaky valve but if there is blowby coming out of the breather tube, it is probably worn piston rings. If it runs ok and you aren't doing a lot of work with the tractor, you may just put off spending much money on it until it gets worse. Someone here will have better advice.
|
|
"If at first you don't succeed, get a bigger hammer"
Allis Express participant
|
|
mmccarty
Silver Level
Joined: 06 Feb 2012
Location: SW Wisconsin
Points: 86
|
Post Options
Thanks(0)
Quote Reply
Posted: 03 Apr 2012 at 5:31pm |
 KD8NGV wrote:
I am working on my newly acquired G. The one thing I noticed is there is a pipe facing downwards coming out of the Valve cover. What is this and what does it mean if there is something coming out of it while running? |
As other have said, it's a crankcase vent. All engines have a certain amount of leakage past the compression rings (blowby). Without a vent it would pressurize the crankcase and cause problems with the oil seals. On a modern engine this vent would be plumbed backed into the engine intake and the gases would be reburned as an emissions control measure. They refer to this as Positive Crankcase Ventilation (PCV).
It's normal to see a small amount of vapor leaving the vent. If it's blowing oil out on the ground, then the blowby is rather excessive and indicative of worn rings.
|
|
