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Author Topic: M8 leaking piston jets  (Read 11735 times)

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J.D.

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Re: M8 leaking piston jets
« Reply #15 on: September 29, 2017, 05:03:02 PM »

IMHO that is not the look of threads pulling but rather tapping that hole after the surface was machined.  Would have to see it up close to say for sure though.
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Re: M8 leaking piston jets
« Reply #16 on: September 29, 2017, 07:00:34 PM »

IMHO that is not the look of threads pulling but rather tapping that hole after the surface was machined.  Would have to see it up close to say for sure though.

That's what I originally thought as well, but if the drill and tap operation was done properly there shouldn't have been that raised area.  I've seen spot facing done both before and after drilling and tapping operations, and I've never seen what I saw in that photo.  Leave it to Harley to find a way though.

Jerry
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Re: M8 leaking piston jets
« Reply #17 on: September 29, 2017, 07:19:24 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:
For those of us with less experienced eyes - can you (or Steve) get a copy of the photo to post with arrows pointing to the areas you are seeing that are suspect.  Trying to understand but I just don't have the degree of technical experience you guys do.
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J.D.

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Re: M8 leaking piston jets
« Reply #18 on: September 29, 2017, 07:46:33 PM »

I suppose you can always drill them out and put stainless inserts in to strengthen them up as a preventive measure.
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Re: M8 leaking piston jets
« Reply #19 on: September 29, 2017, 08:40:21 PM »

I suppose you can always drill them out and put stainless inserts in to strengthen them up as a preventive measure.
Pretty sure they're talking about the area right around the hole itself. Almost looks like a metal o-ring to me that shouldn't be there.
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J.D.

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Re: M8 leaking piston jets
« Reply #20 on: September 29, 2017, 08:43:31 PM »

Look closely at the photo in OP.  Raised metal ridges around the tapped threads preventing the squirter jet from sitting flush.
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Re: M8 leaking piston jets
« Reply #21 on: September 29, 2017, 09:29:43 PM »


Look at the edge around each threaded hole.  It is raised above the surface, which keeps the body of the piston jet from fitting flat to the case.

Jerry
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Re: M8 leaking piston jets
« Reply #22 on: September 29, 2017, 10:14:29 PM »

Look at the edge around each threaded hole.  It is raised above the surface, which keeps the body of the piston jet from fitting flat to the case.

Jerry
Got it.  Thanks.   :2vrolijk_21:
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mark

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Re: M8 leaking piston jets
« Reply #23 on: October 02, 2017, 02:45:36 PM »

If this is causing the sumping, it's hard to believe (though not really) the MoCo hasn't pinpointed it yet.  If it's a manufacturing flaw, I could see the bean counters refusing to issue a recall.
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Re: M8 leaking piston jets
« Reply #24 on: October 02, 2017, 03:17:34 PM »

If this is causing the sumping, it's hard to believe (though not really) the MoCo hasn't pinpointed it yet.  If it's a manufacturing flaw, I could see the bean counters refusing to issue a recall.

It has to become an epidemic before it would ever get "acknowledged" as an actual problem. Then somebody smart has to get involved. With that said,
I'm not the one who figured this one out. Lol..

Steve@fullsac.com
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J.D.

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Re: M8 leaking piston jets
« Reply #25 on: October 02, 2017, 04:07:10 PM »

For reference, the original twin cam camplates have one less oil supply hole than their 2000-2006 counterparts.  If installing the latter plate into the earlier engine this hole needs to be plugged.  It's only about 1/4" diameter but if not plugged will fill the camchest with oil (at idle with the cheap old oil pump) in about a minute.
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CVOThunder

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Re: M8 leaking piston jets
« Reply #26 on: October 11, 2017, 05:49:37 AM »

Good stuff Steve. Thanks for letting us know.
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Re: M8 leaking piston jets
« Reply #27 on: October 14, 2017, 04:28:38 PM »

Does this effect all M8's or just the 114?
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Re: M8 leaking piston jets
« Reply #28 on: February 11, 2018, 12:56:58 PM »

Bringing this back to life.

Any issues with your engine after finding this?
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Re: M8 leaking piston jets
« Reply #29 on: February 11, 2018, 01:13:43 PM »

I just have to ask.... Could the people on the line making the Harleys just not care because of the economic issues affecting the motor company. pressure to produce faster than they want too. I believe that an unhappy employee can cause so many issues, production and moral come to mind. I visited the assembly plant in York, Pa. not blaming them just that they are a factory like so many others. You piss me off, i piss you off. So can it be unhappy employees or just not knowledgeable workers.
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