21226191 Main Bearing Kit | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta standard-size crankshaft main-bearing set for compact D1 and D2 marine diesel engines. The kit contains three matched upper-and-lower bearing pairs for the engine's three main journals. It is a complete standard-size engine set rather than one journal pair. The kit cross-references with Volvo Penta 3884515.

🚤 Compatibility

• HP Range: Approximately 13-40 HP
• Year Range: Approximately 2000s - 2020s

⚙️ Key Features

• Genuine Volvo Penta complete three-main-bearing set
• Standard crankshaft journal size
• Three upper and three lower half-shells
• One kit services one complete engine
• Cross-reference 3884515
• Engine type: Volvo Penta compact 3-cylinder marine diesel

📋 Kit Contents

• 21226191 upper main-bearing half-shell - 3
• 21226191 lower main-bearing half-shell - 3
• 21226191 complete standard three-journal main-bearing set - 1
• Volvo Penta does not allocate separate service numbers to the individual shells; all six shells are supplied under kit number 21226191
• Thrust components and connecting-rod bearings are not included

🔌 Function

The three bearing pairs support and align the crankshaft on pressurised oil films throughout the engine block.

⚠️ Common Signs of Failure

• Low oil pressure or main-bearing knock develops
• Crankshaft clearance exceeds specification
• Bearing shells are scored, wiped or fatigued
• Metal debris is present in the oil filter
• A reground crankshaft is incorrectly matched to standard shells

🛠️ Service Notes

• Have the crankshaft journals measured before ordering so the kit matches the journal size — standard and reground shells are not interchangeable, and neither is a mixed set
• Fit the shells dry behind: clean the saddles and caps, wipe the shell backs, and never oil, grease or scrape the back of a shell, which stops it shedding heat and can let it move in the housing
• Check that each locating tang drops into its notch and the shell sits flush, and keep grooved, plain and flanged halves where the workshop manual for your engine puts them
• Oil the running and thrust faces, refit each cap in its original position and direction, and tighten in the manual's sequence to the torque and angle it specifies, renewing the bolts where they are single-use
• Check running clearance and crankshaft endfloat by the method in the manual and confirm the crank turns freely by hand before the sump goes back — and establish why the old bearings failed, because most repeat failures are oil supply or dirt rather than the bearings

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21226191 → Supersedes 3884515

OEM / Related Numbers

• 3884515 earlier number superseded by this part

Aftermarket / Verified Equivalents

• Recmar: RM21226191

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging