The cap or cup over end of valve is pushed down with the decompression mechanism and is under neath the rocker arm shaft. If you wanted to take the cup off you would have to remove whole rocker arm assembly. They are a regular shaped valve but very small, and open into the spark plug, gasoline side combustion chamber therefore lowering the compression ratio for starting on gas. Usually you can get them to move down a little but getting them to move back up is a little harder. You might be lucky and be able to do so from spark plug hole but those two center ones are really hard to get at. May have to take manifold off. They have to move totally free and also not leak when seated. They are very prone to warping when not cooled on their seats. That is why I suggest checking by cranking with spark plugs removed with lever in diesel position as first of all if stuck open you will have total compression leaking out through the plug hole and if they are closed but leaking you will have some leaking. A slight leak can be tollerated .There are other ways to also check them but this is simplest.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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