head gasket exchange / pressure relief valve?
Posted by RalfR on
URL: http://silk-motorcycles.221.s1.nabble.com/head-gasket-exchange-pressure-relief-valve-tp5002593.html
The head gasket is leaking after running a few minutes on idle.
Self healing or praying is no option so I decide to exchange the head gasket.
It looks like a straight forward operation and it is. Remove the water, loosen the head screws and the head steady and then the cylinder head is coming free.
The old gasket was very fragile and has some fractures.... a new one was needed.
I designed a CAD drawing taking the measurement from the cylinderhead. This data is usefull for lasercutting.
As material I choose for aluminium. The benefit is that you can torque it down to final values and there is no need to retorque after the first ride. I applied a silicon based sealant from Elring which can withstand a temperature of 310 °C..... three times more than you have to expect from a hot engine.
Next time I will cut the sealant apply nozzle as small as possible, you need only a very small volume on both sides of the head gasket.
Now I have to wait 24 h for the sealant to dry out. Then I can refill the water and start the engine for testing.
Is it correct that the water circuit has no pressure relief valve and is open? With a slight over pressure of 1,1 bar you will not have boiling water up to almost 110 °C. Could be a usefull reserve when standing in traffic jam. What is your opinion about that topic?
URL: http://silk-motorcycles.221.s1.nabble.com/head-gasket-exchange-pressure-relief-valve-tp5002593.html
The head gasket is leaking after running a few minutes on idle.
Self healing or praying is no option so I decide to exchange the head gasket.
It looks like a straight forward operation and it is. Remove the water, loosen the head screws and the head steady and then the cylinder head is coming free.
The old gasket was very fragile and has some fractures.... a new one was needed.
I designed a CAD drawing taking the measurement from the cylinderhead. This data is usefull for lasercutting.
As material I choose for aluminium. The benefit is that you can torque it down to final values and there is no need to retorque after the first ride. I applied a silicon based sealant from Elring which can withstand a temperature of 310 °C..... three times more than you have to expect from a hot engine.
Next time I will cut the sealant apply nozzle as small as possible, you need only a very small volume on both sides of the head gasket.
Now I have to wait 24 h for the sealant to dry out. Then I can refill the water and start the engine for testing.
Is it correct that the water circuit has no pressure relief valve and is open? With a slight over pressure of 1,1 bar you will not have boiling water up to almost 110 °C. Could be a usefull reserve when standing in traffic jam. What is your opinion about that topic?
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