Oil bath lubrication
A chain casing absorbs noise and should be as large as possible, to prevent the chain knocking against the casing wall if the chain elongates due to wear. There is no loss of lubricant in an oil bath. The chain linkplates and rollers should be submerged in the bath. Too great a depth leads to overheating of the oil and its premature oxidation, and causes power loss due to the increased running resistance.