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Service bulletin TT466

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10164800
Published by NHTSA2019-09-16
Manufacturer's numberTT466
Manufacturer's date2019-08-20
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

TECHNICAL TIP BULLETIN TT466: UPDATED OIL PUMP FOR MILWAUKEE-EIGHT ENGINES. PURPOSE: To notify dealers that a new oil pump was put into production on some late 2019 and all 2020 Milwaukee-Eight® engines, all models. The new oil pumps are retrofittable to all previous years and models that have the Milwaukee-Eight engine. If replacing the oil pump on 2017 - 2019 vehicle with a Milwaukee-Eight engine and pump should only be install as a complete unit. It is important to note that the new oil pumps, or their internal components, are not compatible with old oil pump versions.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine

Vehicles listed
HARLEY-DAVIDSON TOURING2017 to 2019
HARLEY-DAVIDSON TRIKE2017 to 2018

Listing a model year does not mean every vehicle of it is concerned: the document says which.