I often use a socket over valve collet holders and give it a sharp tap, on all heads not just crusty ones, and the collets often jump out and are caught in the socket. It makes the valve compressor easy to use as well. With the valve grinder try and keep the stone on the valve and not swing way off the valve and come back on and the stones will stay nice longer with a good flat shoulder. Good old tool that grinder for sure.
Yea Righto, I usually just give them the tap with a soft hammer to loosen them. That one that was stuck wasn’t going to come apart without something stopping the valve from opening. The shear size of the head was the main problem with the spring compressor. I’ll have to try that with the grinder in the future, the stones we have are not in great condition, so we need something to face them, but we will get there.
I honestly don’t know exactly. But it’s not a lot. Probably about 4:1. As you can’t tell by the combustion chambers, they were not really going for high compression, the engine was also designed to run on Power Kerosene, which is very low octane.
@@stefantrnacek1394 it’s pretty common in this early stuff. You’ve got to remember that this tractor was built in 1937. The earlier version of this same engine actually has a flat cylinder head with no combustion chambers, but top dead centre is about an inch down the bore.
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The head is coming along nicely.
I often use a socket over valve collet holders and give it a sharp tap, on all heads not just crusty ones, and the collets often jump out and are caught in the socket. It makes the valve compressor easy to use as well. With the valve grinder try and keep the stone on the valve and not swing way off the valve and come back on and the stones will stay nice longer with a good flat shoulder. Good old tool that grinder for sure.
Yea Righto, I usually just give them the tap with a soft hammer to loosen them. That one that was stuck wasn’t going to come apart without something stopping the valve from opening. The shear size of the head was the main problem with the spring compressor.
I’ll have to try that with the grinder in the future, the stones we have are not in great condition, so we need something to face them, but we will get there.
@@vintagetractorsaustralia There is a company called Bundy Sales in Brisbane may well be able to help with stones etc. He would be worth a try.
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What compression ratio does the engine run?
I honestly don’t know exactly. But it’s not a lot. Probably about 4:1.
As you can’t tell by the combustion chambers, they were not really going for high compression, the engine was also designed to run on Power Kerosene, which is very low octane.
@@vintagetractorsaustralia They have to be the biggest combustion chambers I have ever seen.
@@stefantrnacek1394 it’s pretty common in this early stuff. You’ve got to remember that this tractor was built in 1937. The earlier version of this same engine actually has a flat cylinder head with no combustion chambers, but top dead centre is about an inch down the bore.