Volvo Penta Upper Gear Shaft Nut 3852301

Volvo Penta 3852301 is a genuine OEM nut used in Volvo Penta sterndrive upper vertical shaft and upper gear service. The strongest current public parts-diagram trail places this part in the DP-G / Marine Propulsion upper gear assembly as schematic object key 1, where it appears with the shaft, sliding sleeve, spacer, locking clip, bearing, and gear set. Current parts references also show earlier Volvo Penta numbers 854228 and 839332 updating to 3852301, making 3852301 the current OEM replacement number for that exact nut position.

Key Features

• Genuine Volvo Penta OEM nut, part number 3852301.
• Strongest current public diagram support places it in DP-G / Marine Propulsion as object key 1.
• Shown in the same upper gear group as shaft 3852292, sliding sleeve 3855783, spacer 3852298, locking clip 3852295, bearing 3852390, and gear set 3861685.
• Current public parts references show earlier numbers 854228 and 839332 replaced by 3852301.
• Current Volvo-style parts sources list thickness variants in this nut family, with 3852301 identified as the TH=0.00 / H=0.0 mm version.

Engine Compatibility

The strongest supportable fitment trail for Volvo Penta 3852301 is by exact sterndrive assembly position rather than by a single narrow engine list. Current public references place it in DP-G / Marine Propulsion and SX-M Upper Vertical Shaft assemblies, while broader public fitment coverage also associates it with many Volvo Penta drive families and older diesel and gasoline applications. Because this nut is part of a thickness-selected upper gear stack-up, the safest fitment standard is the exact Volvo Penta serial-number-based parts diagram for the drive or engine being serviced.

Serial Number Fitment Notice

Fitment can vary by drive family, upper gear version, and required stack-up thickness. Confirm Volvo Penta part number 3852301 against the exact serial number and the correct Volvo Penta parts diagram before ordering, especially on upper vertical shaft and upper gear assemblies where nearby nut variants such as 3852302 and 3852303 can look identical but differ by thickness.

When This Part Needs Replacement

Replace this nut when the original fastener is thread-damaged, rounded, corroded, distorted, or no longer securing the upper gear or shaft assembly correctly. It is also a smart replacement during upper gear or shaft service when the original nut has already been removed and the driveline stack-up is being checked or rebuilt.

Installation Notes

Match this nut to the exact Volvo Penta application before installation. The strongest public reference places it in the upper gear / upper vertical shaft group, so confirming both the part number and exact diagram location is the safest cross-check before ordering or reassembly. Because current public references also show thickness-specific variants in this nut family, verifying the required thickness in the parts diagram matters more than matching by thread alone.

Alternate/Superseded Part Numbers

Current public Volvo Penta parts references show 854228 and 839332 as earlier numbers updated to 3852301. Use 3852301 as the current primary OEM ordering number for this listing.

Parts Desk Insight

This is the kind of hardware part that looks generic once it is off the drive, but in upper gear assemblies the wrong thickness can affect the whole stack-up. Matching the exact Volvo Penta diagram position first is usually much safer than substituting by thread and wrench size alone.

Shipping: Ships same or next day for fast Canada wide shipping.