OT Engine overhaul
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=45648
Printed Date: 21 May 2025 at 6:35am
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Topic: OT Engine overhaul
Posted By: EPALLIS
Subject: OT Engine overhaul
Date Posted: 15 Feb 2012 at 8:43pm
| Just curious if there was an industry standard (best practise), how many hours does the typical tractor engine run before an overhaul is needed? Any thoughts would be appreciated. Thanks. |
Replies:
Posted By: CTuckerNWIL
Date Posted: 15 Feb 2012 at 8:54pm
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My neighbor just traded a 4230 Deere in cause it had over 13,000 hours and had never been worked on. many of those hours were pulling a 4 row planter or dragging a mixer-mill around but it was still going.
------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: BLee Mn
Date Posted: 15 Feb 2012 at 9:02pm
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the 6080 i bought had 9000 hours and dont beleive it had been touched, i just got done with major overhaul, it was definitely time, low compression, cam ,lifters were shot ------------- Cowboy UP |
Posted By: Stan IL&TN
Date Posted: 15 Feb 2012 at 9:29pm
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Depends on how it was used, treated and maintained. Some will be shot in 1000 hours and some will go 15000 hours. ------------- 1957 WD45 dad's first AC 1968 one-seventy 1956 F40 Ferguson |
Posted By: DSeries4
Date Posted: 15 Feb 2012 at 9:37pm
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It is important to note that John Deere hours were not measured in actual hours. They were maybe 45 minutes (compared to 60). Gave them bragging rights that their tractors could go longer before needing a rebuild. ------------- '49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '61 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080 |
Posted By: D-17_Dave
Date Posted: 15 Feb 2012 at 9:37pm
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I've worked on a few 20K gen sets with Yanmar 4cyl. turboed engines with 15.000 plus hrs on them. They were both covered in oil from lack of service and smoked a little blue when cranked but within 30 seconds cleared mostly up. These units were obviously not maintained real well and in fairly dirty environments and enclosed areas and ran above temps about all the time. But they ran smooth and responded to heavy loads very well. I know this is a little different since they run a constant 1800 rpm's but I'm a FIRM believer in these engines after all of them I had my hands on. ------------- Yea, I can fix that..... |
Posted By: Eric[IL]
Date Posted: 15 Feb 2012 at 9:55pm
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Perhaps the engine's design has something to do with it? I have had no experience with the AC 426 engine being a problem. But, Kenny Barker of Barker Implement just east of Shelbyville, IL (older dealership that has since been deleted by AGCO) told me once that the AC 426 engines in the 7000 series should get fresh crank bearings every 3000 hours. I ask why? He just replied that back in the day, it was a common problem on that engine and their dealership had to do many of rebuilds until they learned to just schedule a replacement. After going to the 3000 hour lower-end schedule, they rarely had problems. Of course, the engine oils of the 1970s - 80s could be consider inferior in some regards to today's multi viscosity synthetic types? I don't know that to be a fact - just saying... That said, I do not consider a lower end schedule an engine overhaul. So, I would venture to say 6,000 - 8,000 hours could be industry standard?
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Posted By: Gerald J.
Date Posted: 16 Feb 2012 at 10:39am
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In most tractors, hours on the tachometer are accurate only at some standard speed, like PTO speed. Slower engine speed, they accumulate slower, faster engine speed they accumulate faster. And that probably matches wear because loads tend to be lighter at lower speeds and heavier at higher speeds. An electric Hobbs meter is more accurate at actual hours though I find it runs ten minutes after I've shut the engine off, so short runs it exaggerates and it doesn't reflect high speeds as harder on the engine. And then tachometer hour meters haven't the greatest reputation for long term reliability often needing replacement far more often than the engine bearings need replacement. So for there is no law specific to tachometer hours like that for vehicle odometers so that fiddling with tachometer hours is not rare with sellers of tractors and combines. You have to "look at the horse's teeth" to get a better idea of operating time. And checking for wear on rod and accessible mains with the pan dropped is a good check, along with wear of seat, fan belt, fan belt pulleys, steering, wheel, pedals, and hitch pin holes. Its not horribly expensive to replace rod and main bearings when found worn, lot less work than doing the whole engine, reqrinding the crank and fixing that new inspection port a failed rod made in the side of the block. Gerald J. |
Posted By: Orange Blood
Date Posted: 16 Feb 2012 at 11:11am
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Our 7060s we get around 9-12K hours depending on use. The loader is on the 9K side just because so much of it is road time, (high RPMs) The field tractors that we don't "road" a lot are around 12K Our 7030 is a baling tractor, but also get lots of road time, is somewhere around 6K, since the last rebuild, and is still pretty strong, and little blowby. Our 190xt was around 10K I think when a hole rubbed in the line post air filter, it was mostly a field tractor prior the 7060s, now it just bales and mows. ------------- Still in use: HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060 Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7 |
Posted By: DrAllis
Date Posted: 16 Feb 2012 at 5:59pm
| Let's just say that you had a 1957 D17 gas and a 1967 D17 series 4 gas. I know for a fact, that if both of them are properly maintained (oil/filter changes...air cleaner maintenance, valve tappet adjustments, etc) and used in the same manner (plowing, discing, hay making, feed grinding, etc) the series 4 will run from 3500 to 5000 hrs before overhaul. It's doubtful the older D17 will run that long because of the slightly sub-standard oiling/filtering system and when you did overhaul it the crank would need to be reground and the series 4 will not need regrinding. Some engines are born to be long lived.....some are not. The harder they work, the shorter the life regardless of the care/maintenance they get. |
Posted By: powertech84
Date Posted: 16 Feb 2012 at 6:49pm
Sigh... Common man, use some common sense. Just goes to show, you can't believe everything you read on the internet...
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DSeries4 wrote: