Drive unit, internal combustion engine, spacer element for a fluid line arrangement, and tool kit for mounting a spacer element

A spacer element for a fluid line arrangement having a cavity adjoined by a first wall element and a second wall element, the first wall element having a bore leading into the cavity and through which a fluid is flowable, wherein the spacer element comprises:

• a resilient clamping sleeve configured to be introduced through the bore in the first wall element, wherein
• the resilient clamping sleeve has a first length portion and a second length portion set back from the first length portion via at least one notch that runs transversely with respect to a longitudinal axis of the resilient clamping sleeve,
• the first length portion of the resilient clamping sleeve is configured to remain in the bore in contact with a bore wall,
• the second length portion is configured as a tube with an axial slot having borders, the borders of the axial slot being curved radially outward,
• the second length portion serving as a spacer element to maintain a defined distance between the first wall element and the second wall element of the cavity, the cavity being accessible for a fluid via the bore in the first wall element.