670t question

I have a Gleaner M3 combine  that has a A/C 670t engine. I had to have the injectors rebuilt and when I  go to the AGCO parts book or the dealer parts counter they show copper seals that go under injector and I got some of them. The injectors of the actual engine dont have these seals, there's nothing there but it does look like copper. I looked in the hole with a borescope and I cant see any seals. It didnt look like it had ever been apart and it didnt leak any compression. I think I'm missing something.

If your oil filters are on the grain bin side of the engine, that is NOT a 670-T.......it is a 649 T or 649 I.......no copper washers used.

just curious , what was wrong with the injectors???

the first clue was it's an M3. Which was never available with a 670. If it had one, somebody took out the original and replaced it. If your AGCO parts guy looked up the parts, it wouldn't show a 670

They did look them up, I was watching them and then I looked later at the same web site they used which was the AGCO parts catalog. It shows all of those engine under the M3 maybe it's not correct. Any way I think that one of the cups under the injector was leaking compression badly enough that it needs to be replaced, this cylinder #2 was miss-firing. This combine had a history of fuel and fuel tank problems before I got it, and since I've owned it everything was gone through except the injectors. That injectors holes were plugged up but I dont think thats all of my problems ,you can see a blown out area and if you look with a bore scope closely theres no way I think its going to seal. How do you change those cups?

The M3 and L3 share the same parts book so that's probably why they were confused.  You have to remember that even a 40 year old parts man was 8 years old when AC was done and a 50 year old parts man was a Senior in high school.  I find it's vitally important to just figure out the parts I need myself from the parts book listing when I go get parts for the AC machines because the guys there have no knowledge of the older machines.  Not their fault and not holding it against them.  Bet they know a lot about the new stuff which I know nothing about.  Now, if you can find a 70 year old parts man...that's a different story!

If you have a 649 with the copper cups, make sure you get the head checked for cracks before replacing any, and you may be better off in the long run to replace them all at once. They are available aftermarket from hy capacity last I checked. The other option is to replace the head with an older head that uses copper washers from a 2900 series engine.

Hurst

Just a reminder that there was two different head gaskets used on the D2900 series engines. The head without the copper injector tubes used a gasket with the small diameter water passage holes. When the copper tube head was introduced in the seventies they added a new head gasket with larger water passage holes to increase water flow into the head. 

M3 green stripe combines had the 426 in them seen one on the lot brand new . I don't care if anyone says different, sold them bought them or ate them, There were M3s that came new from independence with 426s in them. Not all of them, but there were some.

Hurst wrote: If you have a 649 with the copper cups, make sure you get the head checked for cracks before replacing any, and you may be better off in the long run to replace them all at once. They are available aftermarket from hy capacity last I checked. The other option is to replace the head with an older head that uses copper washers from a 2900 series engine. Hurst

I'm not sure how the change carried over into the naturally aspirated engines at the end, so dounless check. On the turbo engines, the copper sleeves started with the 7000 and the 2900 MKII engine. I'm not sure when the change was made to the 4 cylinder little brother, as it wasn't widely used in tractors, just combines before the 6000 series, and I'm not really familiar with the combine side of things. I'm pretty sure the 6000 series engines were all copper sleeves from the factory.

Hurst

1972 model L combines had copper sleeved 301 heads.

Found engine tag and its a 649I, cleaned up the holes in the sleeves in the head, reinstalled injectors and now it runs fine, no leaks. The only problem having is that it runs rough after it first starts , it starts up quickly but runs like it has air in the pump for about a minute then super smooth.  I took the fuel line off the pump before I started it the other day and almost no fuel came out . I wonder if the fuels bleeding off when it sits but I'm not sure how it works seems like there should be a check valve or something maybe in the transfer pump. It's had this rough running on start up problem problem for some time according to the previous owner. The fuel filter is higher than the pump. I'm not sure what to look at next