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HELP NEEDED

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=18507
Printed Date: 07 Feb 2025 at 12:31am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com


Topic: HELP NEEDED
Posted By: ac-mike
Subject: HELP NEEDED
Date Posted: 20 Sep 2010 at 4:02pm

MY CUSTOMER HAS A D-17D ALLIS THAT HAS BLOWN THE HEAD GASKET TWICE. I PULLED THE HEAD OFF AND THE SLEEVES ARE ABOVE THE DECK .010 TO .015 WHICH IS WAY TO MUCH ACCORDING TO MY BOOK. I WOULD ASSUME THAT WOULD BE THE REASON IT BLOWS ACROSS THE FRONT OF THE BLOCK WITHOUT BLOWING THE FIRE RING. THE NUMBER ON THE SLEEVE IS 4508465T. DOES ANYONE HAVE INFORMATION ON THIS SLEEVE THAT WOULD HELP ME DECIDE WHAT WILL NEED TO BE DONE. ANY HELP WOULD BE APPRECIATED.




Replies:
Posted By: Michael Crowe
Date Posted: 20 Sep 2010 at 5:49pm
I don't have the part numbers, but AC did make a sleeve with a taller lip to use when the deck had dropped.  I have a set for my D19D when I get around to rebuilding it.

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Posted By: Brian Jasper co. Ia
Date Posted: 20 Sep 2010 at 6:58pm
How sure are you on the sleeve measurement? Usually the problem is the sleeves sink into the block requiring the counterbores to be recut. Originally, there was a special tool the dealers had to cut the bores and a .020 thicker sleeve. The thicker sleeve is no longer available. Now you either have to have shims made, bores re cut and the block surfaced, or have the counterbores re sleeved.
If your measurements are correct and the sleeves set that high, it sounds like the block was surfaced and the counter bores not re cut.
When re cutting the bores, you also need to pay attention to the piston protrusion. The original blue prints call for .002 to .029 above the deck. My machine shop says his book shows .040 above the deck. Surfacing the block can quickly bump up piston height too far and the pistons can hit the head. My D17D project went from a simple head gasket job to a complete overhaul due to the pistons hitting the head and the sleeves too low in the block. In my case, a compressed head gasket was .055 and the pistons were near .060 above.
You need to pull the engine to tear down and decide if the counterbores are good enough to recut. Mine weren't due to rust and cracks around the head bolts. In my case a replacement block was the cheaper and better repair.
To give an idea what I've gone through, I have right about $1000 in the new block. $500 for the block, $200 for hot tanking and line boring the mains, another $200 to recut the counter bores and surface the deck, and about $100 to put new cam bearings in it. The total overhaul not counting my labor will be between $4K and $5K. I'm leaving nothing to chance though. 
The problems you have are NOT going to be inexpensive to fix. Private message me if you have more questions.


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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford



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