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Exhaust manifold donut

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Saber369(at)comcast.net
Guest

Posted: Sun Jun 02, 2019 7:03 am Post subject: Exhaust manifold donut

Doing the annual on the CJ and found one of the exhaust manifold "donut" gasket needing replacement.  I used an automotive asbestos gasket years ago to replace one but don't remember the part number. Any suggestions?



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richard.goode(at)russiana
Guest

Posted: Sun Jun 02, 2019 9:45 am Post subject: Exhaust manifold donut

I am no expert on the Nanchang, but the seal between exhaust pipe and

cylinder head can be a problem area with the Russian M 14 engine. We

actually call them "olives", but I'm surprised that an automotive gasket is

thick enough – the standard size for the M 14 "olive" is actually 10 mm

thickness, and we produce oversize ones according to a customer's

requirement, and these have been up to 15 mm!



Richard

RICHARD GOODE AEROBATICS

Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK

Tel:  +44 (0)1544 340120   Fax:  +44 (0)1544 340129

e-mail: richard.goode(at)russianaeros.com

www.russianaeros.com

WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES

In partnership with Aerometal Kft, Hungary.



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GeorgeCoy

Joined: 02 Dec 2010
Posts: 310

Posted: Sun Jun 02, 2019 12:13 pm Post subject: Exhaust manifold donut

I believe Doug Sapp has them in stock. If not, then we have them in stock.

p/n 14-04-542.



George Coy

MotorstarNA

714 Airport Rd.

Swanton VT 05488

802-868-5633 off

802-363-5782 cell

george.coy(at)gmail.com

http://motorstarna.com/

SKYPE george.coy



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wlannon(at)shaw.ca
Guest

Posted: Sun Jun 02, 2019 6:32 pm Post subject: Exhaust manifold donut

For general information - these items are identical for the M14P, Huosai and 

AI14R  engines.  The attaching nut is larger for the M14P cylinder but the 

sealing

area is the same.



Walt

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richard.goode(at)russiana
Guest

Posted: Mon Jun 03, 2019 12:08 am Post subject: Exhaust manifold donut

Yes – I was simply interested in the dimensions in that a satisfactory seal

seems to have been made with an automotive exhaust gasket, and if that is

the normal "asbestos" with a thin copper sheet on each side, I suspect it is

probably only around 4 mm thick, whereas the standard exhaust "olives" that

we make for the M 14 engine are 10 mm thick, and for customers where the

cylinder head has become worn (through running the engine with the exhaust

nut loose), we sometimes make special order "olives" up to 15 mm thick!

RICHARD GOODE AEROBATICS

Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK

Tel:  +44 (0)1544 340120   Fax:  +44 (0)1544 340129

e-mail: richard.goode(at)russianaeros.com

www.russianaeros.com

WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES

In partnership with Aerometal Kft, Hungary.

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wlannon(at)shaw.ca
Guest

Posted: Mon Jun 03, 2019 8:58 am Post subject: Exhaust manifold donut

Richard;



When you say 10 mm thick one envisions a solid piece of material.   Though 

I'm sure you are referring to the overall width which is approx. 10 mm it 

could be confusing to those unfamiliar with these engines.



The only exhaust gaskets I have seen for these engines are formed from 

steel, probably beginning in tubular form with a thickness of approx. 1 mm 

(.04").



The sealing effect is obtained from the spring like resistance to further 

deformation under tightening pressure of the nut.



Walt





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richard.goode(at)russiana
Guest

Posted: Tue Jun 04, 2019 12:19 am Post subject: Exhaust manifold donut

No, these are absolutely solid, made out of a soft mild steel. The standard dimension is 10 mm thickness, but some operators/pilots allow the exhaust nut to become loose, so then the flanged end of the exhaust pipe begins to "fret" against the cylinder head, eroding the metal. In these cases, according to the requirement of people, we make bigger "olives" which have been up to 15 mm thickness.

RICHARD GOODE AEROBATICS

Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK

Tel:  +44 (0)1544 340120   Fax:  +44 (0)1544 340129

e-mail: richard.goode(at)russianaeros.com

www.russianaeros.com

WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES

In partnership with Aerometal Kft, Hungary.

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