In this Article we are talking two major hints for Car ( Vehicle ) users.
Carbon Accumulation and How to care of Valves
Good oil used with discrimination will not entirely overcome carbon deposits in the combustion chamber but it will go a long ways towards keeping it down to a minimum.
And the way to fight carbon is to keep after it continually and prevent that heavy accumulation which is exceedingly difficult to remove.
If used properly there is no more active agent than denatured alcohol. Bring a piston in the case of a four-cylinder car to the heights of the compression stroke, at which point both valves will be closed.
After filling the combustion chamber to its capacity close it up and allow it to stay closed for several hours at least.
When all of the cylinders have been treated run the engine for the purpose of blowing out the loosened carbon.
If the alcohol is not brought in actual contact with the carbon the results will not be satisfactory.
It is to be assumed that some portion of the alcohol will find its way down to the oil and it is advisable after having run the engine a while to remove the old oil and substitute a fresh supply.
How to care of Valves.
Valves which are not gas tight require immediate attention and while to some valve-grinding might appear to be a difficult operation yet it can be accomplished if it is approached.
Most difficult part is tie removal and putting back the springs, built as there are tools for this purpose, use of them will .minimize the work.
Before grinding there should be At least a sixteenth of an inch clearance -beneath the end’ of the valve stem so the valve. When the valve had been loosened it must be cleaned thoroughly, first scraping off any carbon which may have accumulated and then using gasoline.
It is rarely necessary to use any but the fine grinding compound for ordinary work. Spread a light coating of the compound on the valve and put a little oil on the valve seat.
Then drop the valve in place and with the aid of a screw driver or a brace with a screw driver bit turn it back and forth about a quarter of a turn without exerting too much pressure.
After several turns have been made turn the valve to a new position and proceed as before until the valve seats well.
At the final grinding use only oil and the result will be a much smoother and better finished surface when the job is done.
In order to check up the work wipe valve and valve scat clean, make several marks on the valve seat with a soft lead pencil, re-seat the valve and give it two or three turns as in grinding.
The erasing or partial erasing of the marks will show whether or not the valve scats properly.
If the valve is in such condition that considerable grinding is necessary it will be economical to get a new one. Valves that are badly pitted can be trued up. Also bear in mind that after grinding it will necessary to adjust the lifters.
The best way to do this is to get a piece of metal that will exactly fit this space when the engine is cold and use that as a gauge.
How to care of Valves & Carbon Accumulation Source : Auto data Book