31330321 Main Bearing | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta red-coded upper main bearing without flange, from the Engine group, weighing 0.043 kg and listed for 70 D series engine applications. It consolidates earlier references 31251577 and 31251378, and the workshop manual gives the selection procedure.

🚤 Compatibility

• Engine Family: D
• HP Range: 110-220 HP

Full model list at the end of this description.

⚙️ Key Features

• Red colour code
• Upper shell, without flange
• 0.043 kg
• Consolidates 31251577 and 31251378
• 70 D series engine applications
• 5 used per assembly

🔌 Function

Provides the upper main bearing shell that carries the crankshaft in the block.

⚠️ Common Signs of Failure

• Deep rumble from the bottom end under load
• Low oil pressure, worst when hot
• Overlay worn through to the shell backing
• Metal debris in the oil and on the filter
• Crankshaft main journals scored or out of round

🛠️ Service Notes

• Four colour grades are catalogued for the upper unflanged position — red, yellow, blue and green — and the colour is the size grade, so follow the workshop manual procedure
• Matching lower shells are separate parts, so order upper and lower by their own numbers
• Main bearing failure usually points at oil supply, so find the cause before rebuilding

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 31330321 → Supersedes 31251577

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D3-110I-B, D3-110I-C, D3-130I-C, D3-220I-G, D3-130A-A, D3-160A-A, D3-130A-B, D3-160A-B, D3-130A-C, D3-160A-C, D3-140A-D, D3-170A-D, D3-200A-D, D3-220A-D, D3-140I-D, D3-140A-E, D3-170A-E, D3-200A-E, D3-220A-E, D3-140I-E, D3-140A-F, D3-170A-F, D3-200A-F, D3-220A-F, D3-140I-F, D3-140A-G, D3-170A-G, D3-200A-G, D3-220A-G, D3-140I-G, D3-190A-B, D3-190A-C, D3-190I-A, D3-110I-A, D3-130I-A, D3-160I-A, D3-110I-D, D3-150I-D, D3-170I-D, D3-200I-D, D3-220I-D, D3-110I-E, D3-150I-E, D3-170I-E, D3-200I-E, D3-220I-E, D3-110I-F, D3-150I-F, D3-170I-F, D3-200I-F, D3-220I-F, D3-110I-G, D3-150I-G, D3-170I-G, D3-200I-G, D3-110I-H, D3-160I-C, D3-190I-B, D3-190I-C, D3-140A-H, D3-170A-H, D3-200A-H, D3-220A-H, D3-130I-B, D3-160I-B, D3-150I-H, D3-170I-H, D3-200I-H, D3-220I-H, D3-140I-H