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Author Topic: M8 leaking piston jets  (Read 11739 times)

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Fullsac Performance

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M8 leaking piston jets
« on: September 26, 2017, 09:20:30 PM »

I tore into my 2017 today to install a 120 piston kit.  While I was in there I decided to remove the piston oilers and see if there was any truth to the possibility of them being loose and leaking additional oil into the crankcase. The bolts were not loose and I couldn't find any wiggle in them, pulled them off anyways. The first thing I noticed that didn't seem right was the gaskets being completely soaked in oil. The next thing that I noticed was the material around the threads was raised creating a hi spot. So I laid the squirter back in place with out the gasket and sure enough it was rocking now.
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Fullsac Performance

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Re: M8 leaking piston jets
« Reply #1 on: September 26, 2017, 09:23:58 PM »

I took a look at the underside of the squriter and you could see where the hi spot was making contact. It even looked as if it had been slightly relieved from the factory, but not enough. I took a 45 deg counter sink and removed material until they sat flat with out rocking.
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J.D.

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Re: M8 leaking piston jets
« Reply #2 on: September 26, 2017, 09:26:36 PM »

This is a very interesting observation.
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Fullsac Performance

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Re: M8 leaking piston jets
« Reply #3 on: September 26, 2017, 09:30:18 PM »

Cleaned everything real good and reinstalled with the gasket and ThreeBond case sealer. Did I fix anything? I would have told you my bike had no sumping issues.
I'm not so sure now?. I am convinced it was bypassing additional oil into the lower end. If I ever split the cases, I will install restrictors in front of the piston oilers to ensure it can't dump excessive amounts of oil into the lower end even if the oil bypasses the jet. The current oil passages feeding the squirters is over .250.
That is huge!

Steve@fullsac.com
« Last Edit: September 26, 2017, 09:35:46 PM by Fullsac Performance »
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Fullsac Performance

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Re: M8 leaking piston jets
« Reply #4 on: September 26, 2017, 09:41:31 PM »

If the cases were apart it would be real easy to drill and tap the passage and install a restrictor. Same thing we have been doing to small block Chevys for years.
Wouldn't be surprised if bumping the oil pressure up makes the plate flex, lift and leak even more. It should have been o ringed and 1/4 20 on the bolts too.

Steve@fullsac.com
« Last Edit: September 26, 2017, 09:49:18 PM by Fullsac Performance »
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Heatwave

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Re: M8 leaking piston jets
« Reply #5 on: September 26, 2017, 09:53:19 PM »

Great work and investigation into the oilers. Thanks for sharing.
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J.D.

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Re: M8 leaking piston jets
« Reply #6 on: September 26, 2017, 09:54:56 PM »

40+ psig of 220+F motor oil can do all sorts of interesting things.
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Re: M8 leaking piston jets
« Reply #7 on: September 26, 2017, 09:56:29 PM »

40+ psig of 220+F motor oil can do all sorts of interesting things.

Do the Stage IV kits get an upgraded oil pump?

Steve@fullsac.com
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Heatwave

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Re: M8 leaking piston jets
« Reply #8 on: September 26, 2017, 10:05:37 PM »

Do the Stage IV kits get an upgraded oil pump?

Steve@fullsac.com

It depends on what pump version is already in the case.
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Re: M8 leaking piston jets
« Reply #9 on: September 28, 2017, 07:26:07 PM »

Do the Stage IV kits get an upgraded oil pump?

Steve@fullsac.com

I was told by several people at Harley that they are shipping the new high performance oil pumps with the stage IV kits. However I don't know what to believe from them anymore.
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Re: M8 leaking piston jets
« Reply #10 on: September 29, 2017, 09:24:50 AM »

I tore into my 2017 today to install a 120 piston kit.  While I was in there I decided to remove the piston oilers and see if there was any truth to the possibility of them being loose and leaking additional oil into the crankcase. The bolts were not loose and I couldn't find any wiggle in them, pulled them off anyways. The first thing I noticed that didn't seem right was the gaskets being completely soaked in oil. The next thing that I noticed was the material around the threads was raised creating a hi spot. So I laid the squirter back in place with out the gasket and sure enough it was rocking now.


Dam...it we told the HD Mechanics to keep adding more gaskets ‘til the rock’in stopped and then tighten it up.   :soapbox:    :2vrolijk_21:  :2vrolijk_21:
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Fullsac Performance

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Re: M8 leaking piston jets
« Reply #11 on: September 29, 2017, 12:44:17 PM »


Dam...it we told the HD Mechanics to keep adding more gaskets ‘til the rock’in stopped and then tighten it up.   :soapbox:    :2vrolijk_21:  :2vrolijk_21:

That's not going fix the issue. Those little threads are pulled up for a reason. Either the little weak bolts were over tightened, or something (oil pressure) is pushing on them real hard trying to tear them out. Add a a little flex at the ears of the plate and we have a shower head instead of a controlled amount of oil.

Steve@fullsac.com
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CVOStreetglide

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Re: M8 leaking piston jets
« Reply #12 on: September 29, 2017, 03:20:18 PM »

That's not going fix the issue. Those little threads are pulled up for a reason. Either the little weak bolts were over tightened, or something (oil pressure) is pushing on them real hard trying to tear them out. Add a a little flex at the ears of the plate and we have a shower head instead of a controlled amount of oil.

Steve@fullsac.com


Steve:

I sure hope you know I was just kidding.    :D   :D

Best Regards

Jerry
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Fullsac Performance

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Re: M8 leaking piston jets
« Reply #13 on: September 29, 2017, 04:04:18 PM »


Steve:

I sure hope you know I was just kidding.    :D   :D

Best Regards

Jerry

Sorry, I'm a little slow these days. lol..
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Re: M8 leaking piston jets
« Reply #14 on: September 29, 2017, 04:59:40 PM »


The photo sure looks like the threads are pulling, causing the high spot.  Is that the case, or is something else going on?  If the threads are actually pulling, it makes me wonder how many will eventually fail completely and allow a bunch of oil to flood the crankcase.  Adding a relief to the cooling jet at the mounting bolt holes won't fix the problem if the threads and surrounding material have been compromised.

Jerry :nixweiss:
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