Final answer:
Carelessly installed valve stem seals may cause excessive oil consumption. Valve stem seals should not be lubricated with grease before installation. Neither Tech A nor Tech B is completely correct.
Step-by-step explanation:
Tech A suggests that carelessly installed valve stem seals can lead to excessive oil consumption. When valve stem seals are not properly installed, they can allow oil to leak into the combustion chamber. This results in the oil being burned along with the fuel and causing excessive oil consumption.
Tech B is incorrect in stating that valve stem seals should be lubricated with grease before the valves are installed. Valve stem seals should be dry and not lubricated with grease because the grease can interfere with the proper functioning of the seal.
So, the correct answer is Neither as both Tech A and Tech B have incorrect statements regarding the installation and lubrication of valve stem seals.