Oil pump

Oil pump repair

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USDP65
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Oil pump

#1

Post by USDP65 » Tue Feb 11, 2020 7:46 pm

I have an oil leak and discovered that my oil pump housing ( '47 FL) has a hairline crack on the very bottom where the oil feed nipple threads in. Question is, can it be removed and welded to repair and if so, is it necessary to remove the gearcase cover to remove the oil pump or can it be carefully removed and replaced without an issue ?



RUBONE
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Re: Oil pump

#2

Post by RUBONE » Tue Feb 11, 2020 9:22 pm

Yes to both questions, it can be repaired (the problem is common when users over tighten the fittings, they are pipe tapers so easily can crack the pump), and it can be removed and replaced carefully. However if the shaft is pushed in a little the key on the drive gear can fall off, and when done that way there is no way to check the pump for binding when it is tightened up.

USDP65
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Re: Oil pump

#3

Post by USDP65 » Tue Feb 11, 2020 9:48 pm

Thanks Rubone, Understood, I was concerned about binding but thought if I carefully marked the case and housing where everything is positioned now that all would fit back as it was ? Is there that much movement on the housing when tightening ? I don't have a lot of experience with oil pumps. The engine was rebuilt and test ran and he must have missed the crack, Don't know how much of an issue it will be, just a drop when sitting, project bike, not all done just yet.

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Re: Oil pump

#4

Post by RooDog » Tue Feb 11, 2020 10:07 pm

When ever one pays to have work done one never knows exactly what was actually done, nor what was not done. I have found that it is better, for me, to educate my self, and do my own work. Having been burned a time or two on farmed out jobs, I try very hard to do all the work on my motorcycles that I can. And what ever I nave to farm out, I try to be able to recheck and confirm the work done for me. If you are gonna play, you are gonna pay, one way or another.....
....RooDog....

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Re: Oil pump

#5

Post by Larry » Tue Feb 11, 2020 11:37 pm

If it's only a drop, spray the area with brake cleaner and cover the crack with Three Bond. If it holds, you got away cheap and the fix will be impossible to see.

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Re: Oil pump

#6

Post by Andygears » Tue Feb 11, 2020 11:52 pm

I have an oil pump with that crack on the bottom and it has been braised around the fitting. I have never tried to remove the fitting or disturb it and it don’t leak.

If you attempt to remove the pump without the cam cover coming off, when you remove the end cover, look close at the drive gear and rotate the motor until the keyways are up. Then with some picks, working gently, the body can be removed per the manual disassembly.

Andygears

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Re: Oil pump

#7

Post by USDP65 » Wed Feb 12, 2020 12:49 am

Maybe I'll give Three Bond a try and good tip on the keyways being up if I go that route- shouldn't have to do this !!

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Re: Oil pump

#8

Post by pan620 » Wed Feb 12, 2020 2:27 pm

I would take the pump and cam cover off and fix it right, putting sealer on is only going to work temporarily, and then the bike will be fully assembled and more time consuming to do right.Or why do you not talk to the person who put the motor together and test run it? Why do people pay some one to do something and when it is not right they ask people how to fix or take to someone else to fix, happens in my shop weekly. Either way good luck with your project!

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Re: Oil pump

#9

Post by RooDog » Wed Feb 12, 2020 4:22 pm

My thoughts on this: Some times an item is best returned to be corrected, but other times I feel that if they didn't do it right the first time, I'll not give them a chance to make it worse. This oil pump issue is the former. But, being that this is a cast iron pump body with a steel fitting, I, personally, would remove it and do a little brazing, that would be MY fix, your choice may be different.....
....RooDog.....

USDP65
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Re: Oil pump

#10

Post by USDP65 » Wed Feb 12, 2020 5:10 pm

I am going to take it apart the correct way including the cam cover and make a proper repair. I would like to return to the builder who was very reputable, and I'm sure he would have taken care of it, but unfortunately he is now MIA.

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Re: Oil pump

#11

Post by RooDog » Wed Feb 12, 2020 6:22 pm

"Reputable" and "MIA" in the same sentence? Hummmm ! ! !.....

USDP65
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Re: Oil pump

#12

Post by USDP65 » Wed Feb 12, 2020 8:13 pm

Like I said, was reputable....shouldn't have said MIA, he is out of business.

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Re: Oil pump

#13

Post by 48Doc » Wed Feb 12, 2020 11:45 pm

The problem described often occurs when the oil line is tightened up. If the pump fitting isn't held stationary with a wrench it also turns and cracks the housing. I would repair the housing with braze, weld or silver solder. For added insurance you can JB Weld or red lock tight the fitting to prevent overtightning.

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