20578851 Main Bearing Kit | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta standard-size crankshaft main-bearing service package for the D16 engine family. Bearing position and engine serial break are critical.

🚤 Compatibility

• Engine Family: D, TAD, TWD
• HP Range: 230 HP
• Year Range: Approximately 2003 onward
• Serial Range: SN002477-., Std

Full model list at the end of this description.

⚙️ Key Features

• Standard-size crankshaft main bearing
• Serial-number-controlled D16 design from serial number 002477 onwards
• Precision matched upper and lower shells
• Used in 16.1-litre Volvo Penta and Volvo Group engines
• Crankshaft journals and housing bores must be measured before assembly
• Engine type: Volvo 16.1-litre 6-cylinder diesel
• Quantity varies by assembly, most commonly six

📋 Kit Contents

• 1 x upper main-bearing shell - kit-only component
• 1 x lower main-bearing shell - kit-only component
• One kit services one journal; six kits are required for crankshaft journals 1-6

🔌 Function

Supports the crankshaft journal, maintains the specified oil film and transfers combustion loads into the cylinder block.

⚠️ Common Signs of Failure

• Low engine oil pressure
• Crankshaft knock or rumble
• Bearing material found in the oil or filter
• Excessive crankshaft journal clearance
• Scored, overheated or fatigued bearing 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

• 20578851 current standard bearing reference from engine serial 002477

OEM / Related Numbers

• 20578853 standard rear / number 7 bearing kit
• 20700881 0.25 mm undersize
• 20700882 0.50 mm undersize
• 20700885 0.75 mm undersize
• 20700886 1.00 mm undersize
• 20700887 1.25 mm undersize
• 270929 standard thrust-washer kit

Other-Brand OEM Numbers

• Kolbenschmidt: 77957600 complete standard 6+1 bearing set
• GLYCO: H1016/7 STD complete set

Aftermarket / Verified Equivalents

• NE: 180059001100 complete set
• VTP: 210224ALT complete set

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D16C-A MG, D16C-A MH, D16C-B MH, D16C-C MH, D16C1-E MG, D16C1-F MG, D16C2-E MG, D16C2-F MG, D16C-D MH, D16C1-E MH, D16C1-F MH, D16C2-E MH, D16C2-F MH
• Volvo Penta D13C3-B MH, D13C4-B MH, D13C5-B MP, D13C3-B MG, D13C4-B MG, D13C2-A MG, D13C1-A MG, D13C7-B MP, D13C8-B MP
• Volvo Penta TAD1640-42GE-B, TAD1640GE, TAD1640VE-B, TAD1640-42VE-C
• Volvo Penta TAD1641VE-B, TAD1641GE, TAD1641VE
• Volvo Penta TAD1642VE-B, TAD1642GE, TAD1642VE
• Volvo Penta TAD1650VE-B/51VE, TAD1650GE, TAD1650VE
• Volvo Penta D8A6-A MH, D8A6-A MG
• Volvo Penta TAD1643VE-B, TAD1643VE
• Volvo Penta TWD1683GE-B, TWD1683VE
• Volvo Penta D4-230I-G
• Volvo Penta TAD1651GE
• Volvo Penta TAD1660-62VE
• Volvo Penta TAD1662VE EU5
• Volvo Penta TAD1670-72VE
• Volvo Penta TWD1643GE
• Volvo Penta TWD1644-45GE
• Volvo Penta TWD1652GE
• Volvo Penta TWD1653GE
• Volvo Penta TWD1663GE
• Volvo Penta TWD1672-1673GE
• Volvo Penta TWD1682-83GE
• Volvo Penta TWD1744GE