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Old 24th August 2021
Muldoonsghos Muldoonsghos is offline
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Question Sportster oil pump upgrade. How can I block the cam chest oil drain?

Hi all.

This forum has a great write up on upgrading earlier oil pumps to later ones. I'm in the process of doing mine, right now. But before I put the engine back into the frame I want to know HOW I can block the cam chest drain? The engine is complete so I can't drill and tap the hole to put a bolt in unless I want an engine full of swarf. Maybe I should clean the surface of oil and fill it with some sort of liquid metal? Nah, it would just vibe out then block oilways. What it the recommended method?

Quote:
Cam chest drain in 77-97 engines
98 and up oil pumps will bolt straight up to 77 -97 engines.
However, 77-97 engines drain the cam chest to the crankcase.
'98 and later pumps all have a scavenge inlet in the cam box and therefore your motor's cam box to crankcase drain is not needed and actually not desirable. 14)
So a complete update would include plugging that drain.
http://sportsterpedia.com/lib/exe/fetch.php/techtalk:evoilre-98_cam_chest_drain_by_aswracing.jpg
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Old 24th August 2021
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I'd think as you've already mentioned that threading the whole would be the best way.
Red Loctite a set screw in there.

I wouldn't suggest any type sealer in there.
Maybe someone else has done it and will chime in.
Can you measure "accurately" the existing hole size?
Is it possible that the hole size is close enough for a self tapping threaded bolt or such?
Do you have a pic of the exact hole location?

This pic is from the pedia.
Is the hole in the same spot on yours?
If so, it is possible to use a "bottoming" tap (no long taper, only chamfered at the end) to make the threads.
You should be able to get most of that hole drilled very slowly and with plenty of thick luge on the bit to keep most of the swarf out of the crankcase.

You can buy a "tap extension" to get the tool out from inside the case to turn the bits.
You can also grind the sides of a drill bit to fit into an extension.
So there are options.

This page is actually concerning the timing hole plug but you can see some of the steps in preventing chips in the motor.
http://www.sportsterpedia.com/doku.p...ref:engmech01a

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Last edited by Hippysmack; 24th August 2021 at 22:26..
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Old 24th August 2021
Muldoonsghos Muldoonsghos is offline
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Good evening Hippy, thanks for your response. This (if I can get a picture to work on this forum) is my hole. No, just, NO.

https://photos.app.goo.gl/KuGe3W4afA4M2ZBy5


I'll try to measure it tomorrow. It doesn't need to be oil tight, as long as it is mostly blocked that will do.
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Old 24th August 2021
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The links say I have to sign in to google.
I think if you redo the settings to share we can see them without signing in to google.
I'm not sure about that but we've seen this happen before.

My first thought would be to thread the hole "almost" all the way in and Loctitie a set screw in there.
That way there shouldn't be any way for the set screw to walk into the crankcase and the Loctite will keep it from going into the gearcase.
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I have updated the link.
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I understand why you want to plug that hole.
But I have a question. Any answer is probably good.
If you plug that hole, and looking at the cam floor, will oil pool too high before running over to scavenge at the pump?
I don't have a 4 speed or I'd already have that answer.

Ok, I see the pic now.
Thanks for leaving the cams in, helps.
It looks like plugging that hole will do no harm in flooding.
But there will be more oil sustained in the cam chest.
May have more oil mist from the cam breather but should be able to address that if needed.
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Question.
Do you still have the oil pressure bypass in the filter pad or have you plugged / bypassed it?
That bypass dumps a lot of oil when it goes off and the front scavenge on that pump should definitely help with that.
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Old 25th August 2021
Muldoonsghos Muldoonsghos is offline
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Picture of the inside of the case from last winter. I guess the small hole in the bottom right is where the pump pulls oil from the sump.

I'm no engineer and I don't have technical proof, but I would guess it would just pool until it overflows into the pump. Maybe some would get drawn up and thrown around, but I can't see what harm it could do?
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Old 25th August 2021
Muldoonsghos Muldoonsghos is offline
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Quote:
Originally Posted by Hippysmack View Post
Question.
Do you still have the oil pressure bypass in the filter pad or have you plugged / bypassed it?
That bypass dumps a lot of oil when it goes off and the front scavenge on that pump should definitely help with that.
It's on my list of Things To Do. I'll get to it when I put the engine back in the frame.

This is my album of where I am now.
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I have no idea what just happened.... but I'll try and post this again.
The hole in the bottom right of that pic is the scavenge hole from the crankcase to the oil pump.
This drawing shows the path.

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