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  #21  
Old 15th September 2018
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Gerotors

There is one very important change in later 83 to the gerotors and pump body and lid from 77-85. The diameter and thickness did not change. But the early had a 45 degree chamfer cut on the edge of the gerotor. And the later was square cut. The later pump body had a relief or clearance if you will, cut into it for the change. So you cannot rum a later gerotor in an early pump body. But you can run the early gerotor in both.

The chamfer-
26491-75- return
26492-75- feed



Square cut-
26491-83 return
26492-83 feed



Hippysmack a link on the first page of this thread to the sportsterpedia that explains this in some more detail. But here are some photos for reference.


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Last edited by DirtyCory; 15th September 2018 at 02:04.. Reason: Photobucket sucks ass
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  #22  
Old 15th September 2018
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Yep, that's the part that sucks working in the pedia, I can't scan copyrighted material.
That is the diagram from TSB M-892 showing the new undercuts.

Chamfer pics are fuzzy but the straight cut one is clear enough.

I've included all of the documentation I have at the moment in post 14. It may be a little hard to follow (time wise) since some changes occurred after the current catalogs were printed.

I've been looking for pics on the forum and there kinda scarce unless I've been looking in the wrong places. I've added a couple first glance (outside) pics to the pedia.

photos by ironheadjunkie




I need dims. I'll look for a used one.

Bring on the pics and dims.
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Last edited by Hippysmack; 15th September 2018 at 05:36..
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  #23  
Old 15th September 2018
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Quote:
Originally Posted by Hippysmack View Post
Chamfer pics are fuzzy

Bring on the pics and dims.
I can take more pictures. Photobucket has been a pain in my ass last few days

What pictures and dimensions are you wanting? I may have the parts
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  #24  
Old 15th September 2018
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I'd like to know the differences (not just visual) but functional and dimensional as well with the upgraded parts along the way.

There are many changes along with progressions of these pumps.
There's a whole lot less data showing what those were.
So, I am wanting to bring all of this together into one place.

Any pic that would answer any question you can think of regarding these pumps.
Basically, any pics of the different part changes would be a good start.
Dims would be helpful if you have a set of calipers.

Dims are subjective without data from the MoCo.
Every caliper can be slightly different.
Every user can be a slightly skewed while measuring.
Every used part can have more wear than another same used part.
Most new parts have target tolerances so each may not measure the same.
So, calling out dims ends up being subjective to the reader.
A picture showing the caliper measuring the part is usually more soothing to the beholder.

That said, without trying to nail down an exact dimension;
Pics with calipers of an original and an upgraded part would give an app. idea of what changed dimensionally.


I'd like to see pics and dims of the pump body bores, internal passages, gerotor and plate ODs and thickness, pump body lengths and so on.

What are the dims to the 2 different check valves?

Side by side comparisons of originals and upgrades.

What is the deal with 1600 pump? It's bugging me...
Questions I thought of while searching the catalogs, pics might help answer.

There are a whole lotta 70's and 80's owners on this forum.
Together, we can do it.

Then I'd like to know if the 5 Speed Oil Pump on 4 Speed Model conversion in this article would work for 77-85 engines also.
http://sportsterpedia.com/doku.php/techtalk:evoil03c
Has anybody done it? Can it be done?
Is it worth it?
If you can put an 07 pump on a 98 to get more oil out of the sump and then retro that pump to a 90 model, could you also adapt it to fit 77-85 models?

If the gear on the pinion shaft is the same and the drive gear matches up at height, then what are the bolt pattern dims between IH and Evo cases at the oil pump mounting bolts.

Pics and Dims help answer some of these questions I have and I'm sure someone else has also... maybe 1 ... or 2 ?


This is what I do.

If pics are a problem to manage, send me a pm for my email address and I'll post them for you.
I can store them in the wiki and you can link them to a post.

Just give me some background on the pic / part so I'll know where / how to place it there.

Last edited by Hippysmack; 15th September 2018 at 04:54..
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  #25  
Old 15th September 2018
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I have a lot of that stuff just havnt posted yet. My time is limited. So little at a time.

Yes there are a lot of 70's and 80's owners on this forum. But the ironhead section of this forum is very slow compared to what it used to be. 3 or 4 years ago, the entire 1st page of the thread list was from 1 day. Now it goes back 5 or 6 days easy.

So I'm not sure how many users are active anymore. I know I wasn't active at all for a few years, but just started participating again.
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Yeah, I got that.

I can't remember what at the moment but I've accredited several of your postings in the Sportsterpedia from past threads.

I bounce around subject matter so much that I lose track.
I was learning all about mags when you hooked me on oil pumps.

But, when I finished the pump articles, I had these questions.

So, when I learn something new, I write it down in the Sportsterpedia.

I don't expect anybody to spend time they can't afford. But, if anybody has pics already, they'd be helpful.
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Old 18th September 2018
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Gear shaft pin part #26430-76

I have new and used of these pins. What is interesting that in 2 out of my 5 pumps there was slight differences in the pin lengths. This difference in length corresponds with the depth of the hole in the gear shaft.

For some reason, the feed pin hole was more shallow on two of these shafts. I don't know why. But this is what I found.

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Old 18th September 2018
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What are the pump cover numbers for each of the two that have different gear shaft pin lengths?

Are both shafts the same length?

Last edited by Hippysmack; 18th September 2018 at 22:25..
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  #29  
Old 20th September 2018
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I found this in one of the pumps that had no casting numbers whatsoever and also in a pump that does have casting numbers. But these are all used pumps that I have gathered over the years so there is no way of telling what has been switched before I got them. Or if anything has been done at all don't know.

There was one out of the 5 shafts that was a little longer in a pump without casting numbers. It seems to be a loner. No Rhyme or Reason. But the extra length just went a little farther in the cover so doesn't change anything.

I'll go over the shafts I have the next time.
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Old 20th September 2018
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OK, so it could just be a quality control issue.

I have a supposed 79 pump on the way. Maybe it'll help compare to yours.
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