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J.C.VleugelTue Nov-15-16 07:44 AM
Member since Nov 15th 2016
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"leaking oil from cylinderhead Norton Model 50 n13 1958"
Tue Nov-15-16 08:58 AM by NortonGuy

          

Dear All,

On behalf of a friend of mine I have some questions. His Norton leaks oil from the cilinderhead.

What is the best cylinderheadgasket to use in this case?

What are the torqs to set for the cylinderhead?

(he has an old workshop manual wich states the torqs in degrees and perhaps because of that he tightened it up too strong. He also says that he does not dare to tighten it up too strong again otherwise the pushrod busses/tubes will tear/maybe the pushrod bus/tube distance is not accurate anymore because of leveling the cylinderhead after distortion in the mating surfaces.)

ive read on the nortonownersclub uk that leakage is also possible via the crushwashers on the stud's I was wondering if this is also the case for this model(model50 n13)?

Many thanks in advance,
Kind regards,
Jakko Vleugel
Arnhem the Netherlands

  

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NortonGuyTue Nov-15-16 08:59 AM
Member since Mar 18th 2009
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#1. "RE: leaking oil from cylinderhead Norton Model 50 ..."
In response to Reply # 0


  

          

Welcome friend.

Here are our online manuals...
http://britmoto.com/

You can search all our messages.

Some members will probably post.

NortonGuy
moderator

NortonGuy
Board Founder

  

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J.C.VleugelTue Nov-15-16 12:19 PM
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#2. "RE: leaking oil from cylinderhead Norton Model 50 ..."
In response to Reply # 1
Tue Nov-15-16 12:19 PM by J.C.Vleugel

          

Dear mr. Nortonguy,

Thank's a lot for the welcome, the answer and the link.

I will look forward to eventual post's on this matter.

Kind regards,

Jakko Vleugel

  

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dynodaveWed Nov-16-16 07:19 PM
Member since Mar 18th 2009
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#3. "RE: leaking oil from cylinderhead Norton Model 50 ..."
In response to Reply # 2


  

          

Sounds like the gasketless system I saw on access norton was the best. Not easy to accomplish but I have heard of it before. Good luck on sealing the head.
cheers
Dave

  

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NortonGuyThu Nov-17-16 09:50 AM
Member since Mar 18th 2009
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#4. "RE: leaking oil from cylinderhead Norton Model 50 ..."
In response to Reply # 3
Thu Nov-17-16 09:52 AM by NortonGuy

  

          

This is what I found...
******
don't bother with the gasket. I use Loctite 574 multigasket, its an anaerobic and doesn't leave rubbery lumps inside the engine.
It hasn't blown yet but has the advantage you could partially lift the barrel and reseal if you had to.

No base gasket here, just Wellseal. It's been noticeable that the barrel nuts have needed re-torquing (by my calibrated spanner-holding hand!) a couple of times, but I have no plans to lift the head to get at the outer bolts.
Not 100% relaxed about this, but that's how it is.
Cheers,
Andy

******
I suspect the real reason for Nortons trying to do without the gasket on the 850 is that the through-bolt system doesn't facilitate re-torquing. I follow the practice of removing the head to re-torque the through-bolts after 100 miles but this means doubling up on the head gasket re-torquing and probably an extra gasket as well.

*******
agree with all of your comments except for the last one about the through bolts going slack because they can't be re-torqued. The 5/16" and the 3/8" studs probably couldn't begin to take over the clamping force on the cylinder. The former because of their size and the later because it's anchored to an unsupported finger in the case. I think they function more for sealing than clamping, it's just that they couldn't hope to hold things together on their own. So if you use a gasket and it takes a crush after the engine's run in, the bolts loosen up some, the studs float a little, and whatever equilibrium you end up with is what you get. Most of the time it's sufficient. Personally, I've gone over to leaving the gasket out. When I did use gaskets I found that if I let the cylinder sit overnight or a few days I could re-torque all the fasteners and get around 1/8 turn out of them.
*********

That is the best advice I could find on the net.
Good luck and keep us posted.

NortonGuy
Board Founder

  

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J.C.VleugelMon Nov-21-16 07:38 AM
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#6. "RE: leaking oil from cylinderhead Norton Model 50 ..."
In response to Reply # 4


          

Thank you Andy,

I will pass this info on to my friend.

It seems that there are more way's to fix the oil leakage.
posted my questions on accesnorton aswel. Got a.o. answer about gasketless system from George Cohen's website.

Who know's your approache to this problem works. I Guess it will be trial and error different approaches till the leakage stops.

Cheers,

Jakko

  

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J.C.VleugelMon Nov-21-16 07:33 AM
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#5. "RE: leaking oil from cylinderhead Norton Model 50 ..."
In response to Reply # 3


          

Thank you Dave for the response.

you are right.

I asked my questions on acces norton aswel and i got a response about gasketless system copy pasted from George Cohens website.

Cheers,

Jakko

  

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