Oil Pump not Sealing
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Stage I
Joined: Mar 2023
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From: Ohio
Oil Pump not Sealing
Having trouble with my oil pump sealing to the case on my 85 Fxst. Had work done on it a year ago and now it won’t seal. Had a new cam new cam bearing new tappets and pushrods all installed by a shop. Got the bike back and now it won’t seal. Took it to another shop and they’re having the same issue. Is it possible one or both surfaces could be warped? I’m at my wits end here. Thanks!
Stellar HDF Member
Joined: Apr 2016
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From: Masshole
Easy enough to tell it it's warped with a straight edge. Wrong snap rings on the pump, key's not seated properly are another couple posibilities. Pictures would help to see where it's not sealing.
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,143
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From: San Diego, CA
I'm a little shocked that you have had two shops not able to get it to seal, and they have no idea why....??? They've made no suggestions on how to fix it?
Can't say I have a lot of faith in those shops......
Can't say I have a lot of faith in those shops......
Stellar HDF Member
Joined: Sep 2021
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From: Black Hills of SD
Is the OP'r maybe talking about the cam cover mating surface to the engine case leaking -not the oil pump inside?
I guess that the question would be - How do you know the "oil Pump" is not sealing = Oil pressure check?
If that is the situation, why did the shop that did all the work give you the bike back if there was an oil pressure problem?
I guess that the question would be - How do you know the "oil Pump" is not sealing = Oil pressure check?
If that is the situation, why did the shop that did all the work give you the bike back if there was an oil pressure problem?
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,143
Likes: 11,211
From: San Diego, CA
Is the OP'r maybe talking about the cam cover mating surface to the engine case leaking -not the oil pump inside?
I guess that the question would be - How do you know the "oil Pump" is not sealing = Oil pressure check?
If that is the situation, why did the shop that did all the work give you the bike back if there was an oil pressure problem?
I guess that the question would be - How do you know the "oil Pump" is not sealing = Oil pressure check?
If that is the situation, why did the shop that did all the work give you the bike back if there was an oil pressure problem?
The OP has an '85 FXST which has an EVO engine. The oil pump has two gaskets and seats into the rear flat surface of the cam chest. Like the Shovel head engine.
You have to assembly, align, and compress all the "guts" (containing a shaft, gears, keys, etc) and sandwich them between a cover, a gasket, a body, a gasket, and then the engine case...
I only did it once, many years ago, and don't remember it being a hard thing to do.... but that was many years ago....
It sounds to me like one of the gaskets started leaking after the OP got his bike back.... he is wondering if the mating surfaces are possible warped...
But I still don't know why the shop won't make it right, or offer a solution to make it right.... ???? For whatever reason, it looks like two shops can't figure it out...
It's always possible I am misunderstanding the problem..
Last edited by hattitude; Mar 22, 2023 at 02:32 PM.
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