21319790 Main Bearing | Genuine Volvo Penta Part

🔧 Product Description

A precision crankshaft main-bearing shell used in the designated Volvo Penta diesel-engine cylinder block.

🚤 Compatibility

• Engine Family: D, TMD, TAMD, MD
• HP Range: 50-75 HP

Full model list at the end of this description.

⚙️ Key Features

• Precision bearing surface
• Maintains controlled oil clearance
• Supports crankshaft loads
• Must match journal size and bearing position

🔌 Function

The bearing carries crankshaft loads while a pressurised oil film prevents metal-to-metal contact.

⚠️ Common Signs of Failure

• Deep crankcase knock
• Excessive journal clearance
• Scoring or metallic debris

🛠️ Service Notes

• Replace main bearings as a complete set and never mix new shells with used ones; check that the grade or size supplied matches the crankshaft, which may have been reground
• Fit the shells with dry backs — shell backs and housings must be clean, dry and free of oil, grease and debris so the shell beds fully onto the housing and can carry heat away
• Make sure each shell's locating tang sits in its recess and that the shell is flush with the housing face rather than standing proud
• Never scrape, file, polish or dress a bearing shell and keep abrasives away from it; check the running clearance against the figures in the workshop manual for your engine using a crush-type clearance gauge
• Lubricate the running surfaces with clean engine oil, refit each cap in its original position and direction, tighten in the stages the manual gives, then turn the crankshaft by hand to confirm it is free

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21319790 → Supersedes 877387

OEM / Related Numbers

• 877387 earlier number superseded by this part

Aftermarket / Verified Equivalents

• Recmar: RM877387

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta 2003, 2003TB, 2003TB SOLAS, 2001AG, 2001B, 2001BG, 2003T, 2002AG, 2002B, 2003B, 2003B SOLAS, 2003 SOLAS, 2001, 2002
• Volvo Penta D2-55, D2-55B, D2-55C, D2-55D, D2-55E, D2-55F, D2-50F, D2-75, D2-75B, D2-75C, D2-75F, D2-60F
• Volvo Penta MD22A, MD22L
• Volvo Penta TMD22A, TMD22B
• Volvo Penta D2003AG
• Volvo Penta TAMD22P-B