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cylinder head studs
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Miken



Joined: 24 Dec 2012
Posts: 544

PostPosted: Sun May 25, 2014 11:08 pm    Post subject: cylinder head studs Reply with quote

I have been cleaning up the bare cylinder block for my Morris prior to reassembly and i notice that some of the threaded holes for the cylinder head studs break through into the water jacket gallery.
This is not a problem but i was wondering what would be a suitable sealant or lubricant to put on the studs for reassembly to stop corrosion and maybe leakage.
The studs were extremely difficult to remove and I don't want to find that they have rusted solid in the block if I ever have to take them out again.
I was thinking maybe silicone grease or Hylomar.
Suggestions welcomed
Thanks, Mike
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goneps



Joined: 18 Jun 2013
Posts: 601
Location: Auckland, New Zealand

PostPosted: Mon May 26, 2014 1:17 am    Post subject: Reply with quote

Mike,

Loctite 243 (nut lock), but thoroughly clean both male and female threads first. This is a common problem, at least with the Eight. The studs have broken through because in the past they've been tightened down too hard to stop them unscrewing with the nuts. Loctite overcomes that problem, and seals the threads.

From your remarks it sounds likely that the studs are old and have been stretched. At the very least they will have suffered from countless heating/cooling cycles. I strongly recommend you obtain new studs, but whatever you do, don't buy the stainless steel ones advertised on eBAy. Common stainless grades are totally unsuitable for this application.

In the case of the Morris Eight I should think Ian Harris could supply new studs, failing which they're simple enough to make from ordinary M10 x 1.5mm bolts by cutting off the head and threading the other end with a die. Zinc plated high tensile bolts (Metric class 8.8 ) are the most suitable.

Richard
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Miken



Joined: 24 Dec 2012
Posts: 544

PostPosted: Mon May 26, 2014 8:38 am    Post subject: Reply with quote

Thanks Richard ,
I will try Loctite.
You are correct in thinking that the studs are rather tired and i have purchased and intended making new ones from 5/16" dia. EN16. Which is what IH gets his made from.
But on reflection HT bolts may be a better source of material.
This is for a 1933 Minor
MN
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Jim.Walker



Joined: 27 Dec 2008
Posts: 1229
Location: Chesterfield

PostPosted: Mon May 26, 2014 11:50 am    Post subject: Reply with quote

I'm not very knowledgable about these engines, though I know some early Morris cars had METRIC components.
But with Mike talking Metric and you MN talking Imperial, someone is VERY wrong.
And NEVER the twain should meet!!
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Quote from my late Dad:- You only need a woman and a car and you have all the problems you
are ever likely to want". Computers had not been invented then!
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ajlelectronics



Joined: 04 Oct 2010
Posts: 168
Location: Gloucester

PostPosted: Mon May 26, 2014 6:12 pm    Post subject: Reply with quote

You could prevent the corrosion in the first place if you stop using water for coolant.
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goneps



Joined: 18 Jun 2013
Posts: 601
Location: Auckland, New Zealand

PostPosted: Tue May 27, 2014 3:25 am    Post subject: Reply with quote

Jim.Walker wrote:
I know some early Morris cars had METRIC components.

Morris engines used Metric threads from c.1919, when Hotchkiss engines replaced White and Poppe motors as supply of the latter dried up. Morris subsequently took over Hotchkiss' Coventry factory, and continued using the Metric machine tools right up until being absorbed into BMC.

To save British mechanics from having to splash out on a set of Metric spanners, Morris instructed its fastener supplier (most likely GKN) to supply nuts and bolts with Metric threads but Whitworth/BSF hexagons. This is sometimes referred to as "Morris' Mad Metric", but the above shows there was method in the madness.

Many (but not all) Morris gearbox threads of the period were also Metric.

Richard
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Miken



Joined: 24 Dec 2012
Posts: 544

PostPosted: Wed May 28, 2014 5:00 pm    Post subject: Reply with quote

.[/quote]
Morris engines used Metric threads from c.1919, when Hotchkiss engines replaced White and Poppe motors as supply of the latter dried up. Morris subsequently took over Hotchkiss' Coventry factory, and continued using the Metric machine tools right up until being absorbed into BMC.
quote]


So why is my 1933 Minor all BSF?
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