Farm Equipment - AC 175D Engine oil problem?

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AC 175D Engine oil problem?

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=45179
Printed Date: 11 Sep 2025 at 10:58am
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Topic: AC 175D Engine oil problem?

Posted By: NC Bruce
Subject: AC 175D Engine oil problem?
Date Posted: 07 Feb 2012 at 10:03pm

My favorite AC 175 Diesel has black oil leaking out of the manifold. Looks like some is running down from muffler joint too. BEFORE I get to take off the manifold for a look, WHAT are some repair possibilites I'm looking at....best and worst ideas?

Tractor cranks, seems to run good, not smoking noticeably more?.., has about 3700 hrs?

I was hoping for 'valve gasket leak' but it looks like only coming thru manifold.

Wish it could be a head gasket, but that's not a symptom, is it?

Does it sound like a bad Piston? if so...why?

Any advice / ideas greatly appreciated!

*Lately, I noticed it was taking a little oil to top it off (on dipstick). I was cutting, raking, and baling just a few round bales ( I know it's Jan, & my Dad would have had a fit....ha!...but missed my fall cutting...besides, hay was short and too dry..if you can believe that!!!)

Replies:

Posted By: MACK
Date Posted: 07 Feb 2012 at 10:25pm

Could be a bad injector or not being worked hard enough to burn oil or fuel that got in manifold. Put it on a good load and see if it clears up. MACK

Posted By: j.w.freck
Date Posted: 08 Feb 2012 at 8:52pm

you are probably right mack,had the same problem with one of my 45-d,replaced the injectors,dont slobber any more...

Posted By: Steve Bright
Date Posted: 09 Feb 2012 at 8:03am

My vote is also INJECTOR

Posted By: NC Bruce
Date Posted: 09 Feb 2012 at 3:24pm

thanx fellows! I had planned to pull the manifold and run it to see what's happening?

What's procedure for checking the injectors? ...to find the bad one,

or remove all 4 and have them each tested?

thanx for any advice.....again!

Posted By: j.w.freck
Date Posted: 09 Feb 2012 at 7:32pm

best to remove the injectors and put them on the test stand and have them run...