D17 IV Oil fill breather?
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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=25242
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Topic: D17 IV Oil fill breather?
Posted By: Craig from IL
Subject: D17 IV Oil fill breather?
Date Posted: 04 Feb 2011 at 7:46pm
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My D17 IV has oil leak out of the oil breather/cap when under load. It doesn't seem to have excessive blow-by. Will a new cap solve the problem at $70 or is there a better way of venting the crankcase? Thanks! Craig
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Replies:
Posted By: MACK
Date Posted: 04 Feb 2011 at 8:55pm
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May be getting ready for a overhal job. Check the hose at carb. for a hole on bottom side. If there is a hole and it has sucked dirt oil out the breather is the first sign. MACK
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Posted By: DrAllis
Date Posted: 05 Feb 2011 at 8:43am
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I'm not discounting the possibility of an engine overhaul, but for years I've always added a breather hose like bigger tractors have, to totally eliminate the oily mess that oftentimes soaks spark plug wires it gets so bad. To do so, first throw away the old breather cap....second, you need to weld/braze a short 3/8" pipe nipple to the neck of the old breather tube 2 inches down from the top and aimed at the battery and a little bit uphill so oil doesn't want to run out of it. Then attach a piece of 5/8" heater hose (about 36" long) to the nipple and run the hose downwards towards the starter and between the starter drive and the side frame. Before welding the nipple to the valve cover tube you have to drill a hole in the tube first, so be sure of proper nipple placement beforte you drill the hole. Finally, obtain a rubber plug to block the end of the tube.....one from a 1978 or newer F2 diesel combine fits very nicely and I think your local auto parts store may have something from a GM car that would also work. The key is to be sure to have the nipple/hose running a bit uphill to keep the oil where it belongs. With this little improvement the engine will now stay dry from oil coming from the breather area.
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Posted By: Craig from IL
Date Posted: 05 Feb 2011 at 10:56am
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Thanks Doc!! This is the info I was looking for. The engine runs like a top and uses very little oil (probably just what comes out the breather). I was raised on AC's and have strayed to other colors, but sure enjoy your posts! Nice of you to share your wealth of knowlege on this forum! Craig
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