Piston scoring D-21/210/220/7030 engines

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   Trying to finish up this customers knocking 220 engine. I've experienced this problem for I'd say 30 years off and on. It's always the engines that don't have piston cooling spraying oil from underneath to keep piston temps down that seem to do this. Replacement pistons and sleeves are parts that work fine in 7040's and bigger because they do have piston cooling, but the newer design piston/sleeves do not like being used in the old non-piston cooled engines. Unfortunately, the old piston/sleeve parts have been discontinued for a very looong time.  All you can purchase now is the newer designed tighter fitting parts.  The older engines used to spec piston skirt to cylinder sleeve clearance at .007". All the newer piston/sleeve kits are .003".  Sometimes they work for years and then, just like this engine, you've got a mess to deal with. I've got a jig made to take my sleeves to a favorite machine shop and have (new or old) sleeves power honed out an extra .004" to alleviate this problem. It's an unfortunate event with no warning whatsoever. My advice is if you are overhauling one of these older non-piston cooled engines, you'd better loosen it up a little or you might get to do it again someday down the road. Pictures on the way.

	This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
	The Forum	Parts and Services	Unofficial Allis Store	Tractor Shows	Serial Numbers	History

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 22237	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Topic: Piston scoring D-21/210/220/7030 engines Posted: 1 hour 58 minutes ago at 9:09pm
	Trying to finish up this customers knocking 220 engine. I've experienced this problem for I'd say 30 years off and on. It's always the engines that don't have piston cooling spraying oil from underneath to keep piston temps down that seem to do this. Replacement pistons and sleeves are parts that work fine in 7040's and bigger because they do have piston cooling, but the newer design piston/sleeves do not like being used in the old non-piston cooled engines. Unfortunately, the old piston/sleeve parts have been discontinued for a very looong time. All you can purchase now is the newer designed tighter fitting parts. The older engines used to spec piston skirt to cylinder sleeve clearance at .007". All the newer piston/sleeve kits are .003". Sometimes they work for years and then, just like this engine, you've got a mess to deal with. I've got a jig made to take my sleeves to a favorite machine shop and have (new or old) sleeves power honed out an extra .004" to alleviate this problem. It's an unfortunate event with no warning whatsoever. My advice is if you are overhauling one of these older non-piston cooled engines, you'd better loosen it up a little or you might get to do it again someday down the road. Pictures on the way.

Sponsored Links