Changed rings but plugs still oil-foul

Changed rings but plugs still oil-foul.

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Don P
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Re: Changed rings but plugs still oil-foul

#46

Post by Don P » Fri Jul 13, 2018 10:00 pm

Had the same problem with my 51. The machine shop had to shave .010 of the face of the head due to inserts pulling out some. That solved the problem



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Re: Changed rings but plugs still oil-foul

#47

Post by Doc37W » Mon Jul 16, 2018 6:22 pm

Don P wrote:
Fri Jul 13, 2018 10:00 pm
Had the same problem with my 51. The machine shop had to shave .010 of the face of the head due to inserts pulling out some. That solved the problem
Never in all the years I've been working on H-Ds, have I seen headbolt inserts pull out of a head (Have seen threads stripped on heads & cylinders bc someone put a 'cheater pipe' on the wrench while tightening the headbolts!). What I have seen is the aluminium between and around the inserts be worn away by the old asbestos headgaskets from the head expanding and contacting (from starting,running,& shut off over time). The newer teflon or grafite gaskets are slippery enough to not wear away the surface material. The Service School instructors said the best way to renew the head gasket surface on Pans & Shovels is to mill the same MINIMUM (usually about .010") amount off both heads to get them flat, then,counterbore the steel inserts another .010"-.015" from the headgasket surface. I've freshened up heads later that I did that to, never saw any more wearing away of the surface (but I never used the asbestos headgaskets on them, either). Doc

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Re: Changed rings but plugs still oil-foul

#48

Post by Panacea » Mon Jul 16, 2018 9:32 pm

Doc! that's the same explanation I got from an old Harley mechanic back many years ago when I did my first pan re-build, he set a couple metal blocks on his bridgebort, clamped the head down and took off .010 like you said. You are the only other person to state that as to why the cast-in threads tend to protrude...

panheadrider1961
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Re: Changed rings but plugs still oil-foul

#49

Post by panheadrider1961 » Sun Jul 22, 2018 4:55 pm

question did you get it to stop oil fouling? i cant see a expander on oil ring the honeycomb it should seal at ring gap opposed 180 degrees from each other looking at both pictures on piston and on work table without this installed it still will suck oil , and all oil rings i have every put on pistons had it 1 pc. or 3 pcs just wondering

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Re: Changed rings but plugs still oil-foul

#50

Post by melchorz » Sat Jul 28, 2018 10:54 pm

I used the rings straight from the un- opened box.
See previous photos.
Bike has been back together for awhile but had no time yet to take a test ride.

panheadrider1961
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Re: Changed rings but plugs still oil-foul

#51

Post by panheadrider1961 » Sat Jul 28, 2018 11:23 pm


melchorz
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Re: Changed rings but plugs still oil-foul

#52

Post by melchorz » Mon Oct 15, 2018 5:31 pm

Bike is running!
I measured the bore which was well within spec for .020 over. So l put NOS pistons in from eBay.
Thanks to all who gave advice.
Brief video:

melchorz
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Re: Changed rings but plugs still oil-foul

#53

Post by melchorz » Mon Oct 15, 2018 5:34 pm

panheadrider1961 wrote:
Sun Jul 22, 2018 4:55 pm
question did you get it to stop oil fouling? i cant see a expander on oil ring the honeycomb it should seal at ring gap opposed 180 degrees from each other looking at both pictures on piston and on work table without this installed it still will suck oil , and all oil rings i have every put on pistons had it 1 pc. or 3 pcs just wondering
Yep, see last post.

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Re: Changed rings but plugs still oil-foul

#54

Post by melchorz » Mon Oct 15, 2018 5:44 pm

Doc37W wrote:
Mon Jul 16, 2018 6:22 pm
Don P wrote:
Fri Jul 13, 2018 10:00 pm
Had the same problem with my 51. The machine shop had to shave .010 of the face of the head due to inserts pulling out some. That solved the problem
.....Never in all the years I've been working on H-Ds, have I seen headbolt inserts pull out of a head (Have seen threads stripped on heads & cylinders bc someone put a 'cheater pipe' on the wrench while tightening the headbolts!). What I have seen is...... Doc
My local Harley guru said the same thing. He said the inserts can never (never say never) go beyond bottoming against the top of the solid cast iron cylinder.

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