Build date
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=195713
Printed Date: 25 Aug 2025 at 9:59pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Build date
Posted By: Allisguy93
Subject: Build date
Date Posted: 16 Jun 2023 at 9:03pm
| How do I identify the build date on my 670T motor ? It has the serial number tag but I cannot find a source to cross any of the numbers to determine the year and possible confirm what the motor is out of Any help would be appreciated, thanks |
Replies:
Posted By: DrAllis
Date Posted: 16 Jun 2023 at 9:22pm
| About all you can do is look for a casting date number on the block and that would be close by a year or so. A model 670-T was first used in late 1977 in the 7045 tractor and L-2 combines. It would have had a Stanadyne injection pump and A-C injectors. Painted black for a tractor and orange for a combine. In 1980 the combine engines became black and Bosch injectors were late 1980/81. M-100 Bosch injection pumps came in 1982 in model 8030 tractors and L-2/L-3 combines. The type of flywheel also is a clue to tractor versus combine. If it has a hydraulic pump drive on the left side it might be from a New Idea Uni-Harvestor. |
Posted By: Allisguy93
Date Posted: 17 Jun 2023 at 7:54am
| Ok that helps me a lot thank you. This one is black and Bosch injectors , stanadyne pump |
Posted By: Allisguy93
Date Posted: 17 Jun 2023 at 10:00am
 Would that be a 1980 then? And it’s a 670 i. Not 670T idk why I said T. It’s intercooled |
Posted By: DrAllis
Date Posted: 17 Jun 2023 at 6:24pm
| I'd guess the 21st week of 1980 the block was cast. So, probably a late 1980/early 1981 built engine. Could be a 7060 or maybe an N-5. What's the injection pump model?? DM-4 XXXXXXXX. What's the crankshaft pulley groove count?? Rubber crank pulley or fluid damper?? What style flywheel ?? |
Posted By: Allisguy93
Date Posted: 17 Jun 2023 at 6:42pm
| Dm4629 pump. 3 groove pully on crank Fly wheel i don’t know. Was told it was out of a n6 combine but I’m thinking it was a n5 |
Posted By: DrAllis
Date Posted: 17 Jun 2023 at 6:53pm
| DM4-629 with a RUBBER crankshaft pulley ain't a combine, its a 7060. If it has a fluid damper and not a rubber pulley it would be N-5. Four inch exhaust elbow is N-5, Three inch is 7060. Complete numbers off the injection pump would confirm what I've said. |
Posted By: Lynn Marshall
Date Posted: 17 Jun 2023 at 7:00pm
| There appears to be an auxiliary drive plate bolted onto the back of the front engine plate. I would say combine engine. They must have the water filter tapped into another location because they aren't using that block drain. |
Posted By: Allisguy93
Date Posted: 18 Jun 2023 at 8:19am
I will take more pictures of it but it’s 4” exhaust elbow and I’m guessing the pully on the crank is off the original motor being it’s plum and so is the water pump but the motor is black also the oil filler kneck is plum in color 
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Posted By: DrAllis
Date Posted: 18 Jun 2023 at 10:36am
| Pump has had work done to it with all the XXXXX. 2300 RPM means 7060. Manual shut-off means tractor. Electric shut-off means combine. DM4-629 means 7060 or N-5. Rubber crank pulley means tractor. Fluid crank pulley damper means N-5 combine or 7080. 4 inch exhaust pipe means N-5 or 7080. 3 inch exhaust means 7060. |
Posted By: Lynn Marshall
Date Posted: 18 Jun 2023 at 10:52am
| I don't see the manual lever on the pump and there's a wire hanging there in the picture, so??? Super hybrid engine with a variety of parts used as needed. |
Posted By: Allisguy93
Date Posted: 18 Jun 2023 at 12:52pm
| Yes it’s a electric shutoff I was always told it was out of a N6 but from you guys know it appears to be a N5 it sounds like and around a late 80 to 81 model year |