Volvo Penta Propeller Shaft Bearing Inner Ring 984225 | DPH DPR Lower Unit

Part Details

• Part Number: 984225
• Brand: Volvo Penta
• Type: Inner ring — propeller shaft roller bearing assembly
• System: Sterndrive lower unit — propeller shaft bearing housing
• Diagram Position: Propeller shaft / bearing housing assembly — directly adjacent to roller bearing 984222
• Qty Per Assembly: 1
• Weight: Approx. 0.2 kg
• Important: Inspect as a matched set with roller bearing 984222 — replace both if either shows wear or damage

About This Part

Genuine Volvo Penta 984225 is an OEM inner ring used in the propeller shaft and bearing housing assembly on Volvo Penta DPH and DPR sterndrives. Parts diagrams place 984225 directly beside roller bearing 984222, where it forms part of the internal shaft-support bearing arrangement inside the lower gear housing. Because the inner ring functions as the mating running surface for the roller bearing, its condition must be evaluated together with 984222 — a worn or corroded inner ring will accelerate damage to a new bearing if reused. Several roller bearings, needle bearings, inner rings, seals, and shims are installed in close proximity inside DPH/DPR lower units; confirm drive model, serial number, and diagram position before ordering.

Compatible Applications

DPH Series (diagram-confirmed):

• Volvo Penta DPH-A
• Volvo Penta DPH-B
• Volvo Penta DPH-D / DPH-D1
• Volvo Penta DPH-C, DPH-E — referenced in application catalogs; confirm against exact drive serial-number diagram

DPR Series (diagram-confirmed):

• Volvo Penta DPR-A
• Volvo Penta DPR-B
• Volvo Penta DPR-D
• Volvo Penta DPR-C — referenced in application catalogs; confirm against exact drive serial-number diagram

• Volvo Penta DPI-A — referenced in application catalogs; confirm against exact drive serial-number diagram

Always confirm drive model, serial number, and exact diagram position before ordering. Similar rings, bearing races, and spacer components within DPH/DPR lower units can appear similar but are not interchangeable.

When to Replace

Replace this inner ring when inspection reveals any of the following:

• Pitting or scoring on the bearing running surface
• Corrosion from water contamination
• Excessive bearing-surface wear
• Heat discoloration indicating overloading or lubrication loss
• Damage discovered during roller bearing 984222 replacement
• Any wear that affects the mating surface for the associated roller bearing

If roller bearing 984222 is being replaced, inspect 984225 at the same time and replace it if there is any sign of wear, corrosion, or heat damage. Reusing a worn inner ring with a new bearing will shorten the new bearing’s service life.

Installation Notes

Inspect roller bearing 984222, the propeller shaft running surface, adjacent bearings, seals, shims, and the bearing housing bore during service. Volvo Penta diagrams show 984225 immediately adjacent to 984222 — both components should be carefully inspected for matched wear before reassembly. Bearing installation depth, preload, and shim selection must follow the applicable Volvo Penta workshop procedure for the specific DPH or DPR drive model.

Related Parts in This Assembly

• Volvo Penta Propeller Shaft Roller Bearing 984222 — DPH DPR (mating bearing for this inner ring)
• Volvo Penta Drive Shaft Ball Bearing 984223 — DPH DPR Sterndrive
• Volvo Penta Needle Roller Bushing 984224 — DPH DPR Drive Shaft Lower Unit
• Volvo Penta Bearing Box 22173381 — DPH DPR Sterndrive

Cross-Reference Part Numbers

• OEM: 984225
• Note: No confirmed Volvo Penta OEM superseding number identified in current parts references.

Parts Desk Insight

984225 is the mating inner ring for roller bearing 984222 in the DPH/DPR propeller shaft bearing stack, and it is the part most commonly overlooked during a lower-unit bearing service. The standard mistake is replacing the roller bearing while reusing the original inner ring — if the inner ring has any pitting, corrosion, or heat marking, the new bearing will run on a damaged surface and fail well before its expected service life. If the lower unit has been water contaminated or overloaded, plan to replace 984225 together with 984222 rather than inspecting and deciding at teardown.