Final answer:
Plastigage is a thin plastic thread used to measure clearance between journal bearings and bearing surfaces. Removing it before further installation is important to prevent lubrication and functioning issues. Leaving Plastigage can hinder oil flow, increase friction, and cause damage to other components.
Step-by-step explanation:
Plastigage is a thin plastic thread that is used to measure the clearance between journal bearings and the bearing surfaces. It gets compressed when torqued down by a fastener, and the resulting thickness is measured to ensure the proper clearance. However, it is important to remove the Plastigage from the journals before further installation because leaving it in place can affect the lubrication and functioning of the engine or machinery.
When the Plastigage is left in the journals, it can act as a barrier and prevent proper oil flow, which can lead to increased friction and wear on the bearing surfaces. Additionally, if the Plastigage is not completely removed, it can become dislodged during operation and cause damage to other components. Therefore, it is crucial to remove the Plastigage to ensure optimal performance and longevity of the engine or machinery.