Last week the outlet valve seats were replaced by new hardened ones. If you want to use lead free petrol or LPG you need harder valve seats than the original valve seats who are directly cut into the edge of the valve port of the cast-iron Volvo B20B cylinder head.
And while the engine was still disassembled I brought the cylinder head to
Chris Milton Engines
Sam took some pictures of the whole process.
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| Cylinder head Volvo B20B |
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| Cylinder head and new exhaust valve seat |
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| Removing the old valve seat |
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| New uncut valve seat in place |
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| Cutting valve seat |
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| Cutting valve seat |
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| Valve seat cutted |
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| Refined shape of outlet port with new hard valve seat |
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| Ready |
Sam also did a vacuum test on the inlet valves; all good. Normally there´s no need to replace the inlet valves because they get less hot then the outlet valves.
Where did you get your hardened valve seat for the exhaust from?
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