6080 Question

Does anyone know what year the 6080 engine was modified to permanently address the thrust bearing issues ie: the engine was redesigned. Common thought is it was done on the later years but unknown when. Tractors were built 1980 - 1985 along with some other attempts to fix, the early models required a thrust bearing adapter installed to reduce pressure from clutch particularly on start up. If anyone knows the specific serial number on date modification was made going forward or where one might find that documented.

Thanks !

33--21863 was the cut in sn - can't go by date as many 6080's had the engines replaced.

About and not exactly - but if you look at the valve cover and it has a stack of spring washers under the tappet hold down bolts and if the inj lines go up and to the front then back up it is close to the sn cut in range.

AC did test the 6080 and put a lot of hours on them with no problems. HOWEVER when put on farms, the origional 4.33's had a really low compression. They were hard to start , thus the foot clutch was pushed in as was the PTO clutch and the engine was turned over for a LONG time before sputter starting then clean out. During this time there was over double the end thrust of a 180-200 due to the LUK or OMg clutch with

the two release brgs and no oil pressure. Then most operators left the PTO lever back thus ensuring the thrust load maintained a future that was not long. At first we started getting complaints of front mains leaking, then a noise in the engine as the crank ate into the block. The program was to check all thrust measurements, and put in new slotted main thrust bearings , which was a stopgap method. Finally all units proir to the time double wide thrust brgs were started, were programed and the front support kit as external thrust brgs were installed. Most dealers put them on everything from 6060's and all 6080's. Service was most lienient in this area. It was a mistake and one of the many nails in the AC coffin as the cost was in the millions. The folks at Harvey charged the Ag division for all the short blocks - as always - it was not their fault - thus the money went from one pocket to the other and out the door.

Thanks to all of you - DSeries4, Steve Z and TBran: I am brand new to the forum .... So I just have a couple of follow-up questions. DSeries4 - How can I obtain Norm's Book is it online for sale and does it go by another title? TBRAN - So the engine serial number is the control for the newer design along with the other observations on the engine. Steve Z: Thanks for the guidance on the PTO lever. As an aside, I grew up in Milwaukee and the surrounding communities. In my younger days circa 1973 - 1974, I had a friend who worked second shift at the AC plant in West Allis. After his shift was over we would meet at a small bar called Tom & Jerry's on Greenfield Avenue just up from the plant. So, those were the days as they say.....

sn is on the front lh side of the block just under the head gasket - if it is missing then it has been 'messed with'.

Older blocks can have the big thrust brg and crank installed as well. The wire edge has to be filed down in the block - the main cap is ok to accept the wide brg. .

www.agcopartsbooks.com enter as guest search for 6080 then search for crank.

was this a problem with the 6060s also ?

Life is tough,but it's tougher when you're stupid. - John Wayne

I have a 6060 and it has the add on thrust bearing kit.

'49 A-C WD, '51 A-C WD, '63 A-C D17 Series III, 1968 A-C One-Seventy, '82 A-C 6060, '75 A-C 7040, A-C #3 sickle mower, 2 A-C 701 wagons, '78 Gleaner M2

Yes 6060 had the problem too
wish the dealer would have told me
before the damage was done

WD WD45 DIESEL D 14 D-15 SERIES 2 190XT TERRA TIGER ac allcrop 60 GLEANER F 6060 7040.and attachments for all Proud to be an active farmer

michaelwis wrote:

Yes 6060 had the problem too
wish the dealer would have told me
before the damage was done

All years?

Life is tough,but it's tougher when you're stupid. - John Wayne

	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