I have an old D6 with the D6600 engine. I finally got it fired up last week and found the injection pump was leaking. This has the individual pumps that sit on top. One of those pumps appears to be leaking below the star shaped nut. Not positive that is where its coming from, but I'm pretty sure it isn't coming from the injection line. Anybody ever had one of these pumps apart???

Checked all my stuff but I don't have any parts breakdown on those old flanged type injection pumps other than setting and adjustment. Maybe edb might have something if he catches this post. I would suspect there is a gasket under that star nut but I do not know for sure. Are you sure it is not a cracked ferrule on the injection line?

Hi Team,
never had a reason to dismantle one of these units, usually they were visually US from pumping dirt with tram line grouves worn into the helix area which made them pump low volume on testing and so were junk.
A leak in the area described could be caused by an injector which has high valve opening pressure (VOP), is partially blocked at the orifice, sticky needle, or an injection valve needle with less than the 0.007" needle lift, crimped fuel delivery line--also seen lines worn through and brazed up partly blocking the pipe also causing artificially high VOP's.
There is a dowel pin which would need to be removed to get the top star nut undone to get the guts out, I think the star nut is splined onto the bonnet so it can be verniered to get the lock grouve to line up to the dowel pin location, also a screw in the lower front of the pump body. These are not a serviced item, they are not meant to be worked on and as a result no parts were ever available.
You may get lucky and be able to tighten the star nut and/or lap in the faces of the pump components.
Beaver-flat and OM, sorry this is about the best I can do to help you.
Cheers,
Eddie B.

Hi edb,
Thanks for the response but I was thinking beaver-flat was referring to the very early D6600 in the 2H D6 that used the old flange type injection pumps.
Do you have any info on them?

hello ,in the operator book it doesn't show any info about the pump ,only how to bleed the system ,is the star nut you need info about ,the vent valve ,it may have a bit rust /dirt stopping it from setting properly ,i would say that over tighten then may also could them not to set properly from damaging the set area of the valve ,may have to take them out to have a look at the set area,bruce oz

Hi Team,
yeah well I took a guess for the later type, have no sectioned pix of the flange type FIP.

If beaver-flat has the flange type FIP then Bruces' call is the most likely candidate for the bleed screw seating. A leak here would appear to come from around the star nut area.
If the bleed screw is not leaking then I believe the construction of the flanged and tall pumps is similar enough for my pic to be usefull in dismantling the FIP. Really the major visual difference between the two pumps is that the flange type sits mainly down into the pump housing and the tall pump sits on top. The basic construction would be the same. I stand to be corrected on this point as I have handled both types but never dismantled either.

Thanks guys!
It is actually the later style as shown by Edb.
I've got the fuel filters out right now, had to order the replacements. When I get it back together I'll double check the injection line ferrule as OM suggested. If it is the actual pump leaking, sounds like I need to give Jim zimmerman a call for a replacement....
My parts supplier says the fuel filters (6 of the sock type) are obsolete. He did manage to find 6 of them ($70 for the 6) at a warehouse in Nebraska though. Don't know what I'll do the next time they need to be changed!

What is the serial number of your tractor?
Are the fuel filter elements a part # 2A5247 (strainer) or the later type #7B8261
which are common to many tractors and have a Wix interchange #33164. $10.00 each is about the going price.

The tall pumps are a part number 2A4424 or 6B6080....10mm bore common to the 5-3/4 in bore engines. The current number I show for new replacement is a #8M9760 @ about $90 ea.

Thanks OM the s/n is D6-2H7640.
I got it running again today and the pump is definetly the source of the leak. It developed into a spray, coming right from under the star nut!
I'm going to try dissasembling it to see if I can replace the gasket....figure worst case I still have to buy another pump.