20790423 Big-End Bearing Kit | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta 0.25mm repair-size big-end bearing pair for Deutz-derived D5 and D7 engines fitted with connecting rod 20585982. It is used after the crankpin has been professionally reground 0.25mm undersize. One kit services one connecting rod. Four-cylinder D5 engines normally require four kits and six-cylinder D7 engines normally require six kits. The bearing is serial- and rod-revision controlled.

🚤 Compatibility

• Engine Family: D, TD, TAD, MD
• HP Range: Approximately 110-320 HP
• Year Range: Approximately late 1990s - 2010s

Full model list at the end of this description.

⚙️ Key Features

• Genuine Volvo Penta 0.25mm D5 / D7 big-end bearing pair
• Only for connecting rod 20585982
• Four kits for D5 four-cylinder engines; six kits for D7 six-cylinder engines
• Engine type: Volvo Penta 4- or 6-cylinder Deutz-derived turbocharged industrial diesel
• Quantity varies by assembly, most commonly six

📋 Kit Contents

• 20790423 upper connecting-rod bearing half-shell - 1
• 20790423 lower connecting-rod bearing half-shell - 1
• 20790423 matched 0.25mm big-end bearing pair for one connecting rod - 1 set
• Volvo Penta does not assign separate service part numbers to the two half-shells; both are serviced under kit number 20790423
• Connecting-rod bolts and small-end bushing are not included

🔌 Function

The shell pair supports one connecting rod on the crankpin oil film and carries combustion and reciprocating loads.

⚠️ Common Signs of Failure

• Big-end knock develops under load
• Bearing clearance exceeds specification
• Shells are wiped, scored, fatigued or heat-discoloured
• Metal debris is present in the sump or oil filter
• The installed shell does not match crankpin repair size

🛠️ Service Notes

• Fit the shells dry into clean, dry rod and cap housings with the locating tang in its notch, then oil the running face only — oil or dirt trapped behind a shell stops it bedding and carrying heat away
• Never file, scrape or dress the shells, the backs of the shells or the cap joint faces; the crush that locks a shell in place depends on those faces being untouched
• Measure the crankshaft journals and check the clearance you actually have, with a crush-type clearance gauge or a bore gauge and micrometer, against the figures in the workshop manual for your engine — a scored, worn or oval journal will destroy new shells
• Keep each pair of shells with its own rod and cap, refit caps the original way round, and read the wear pattern on the shells you removed; it usually tells you why the bearing failed
• Renew the rod bolts where the manual calls for it, tighten by the specified method and sequence, and confirm the crankshaft still turns freely by hand before going any further

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21203681 recognised related / superseded 0.25mm bearing reference where catalogued

OEM / Related Numbers

• 20585982 required connecting-rod reference

Other-Brand OEM Numbers

• Kolbenschmidt: 79408610
• Deutz / KHD: 0428 4146

Aftermarket / Verified Equivalents

• King: CR1634CP0.25
• Component references: 60132610
• Component references: 72189610

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D7A-B TA, D7A-T, D7A-TA, D7C-B TA, D7C-TA
• Volvo Penta D5A-B TA, D5A-T, D5A-TA
• Volvo Penta MD2010, MD2010B
• Volvo Penta TAD520GE, TAD520VE
• Volvo Penta TAD720GE, TAD720VE
• Volvo Penta TAD721GE, TAD721VE
• Volvo Penta TAD722GE, TAD722VE
• Volvo Penta TAD730GE MECH, TAD730GE EDC4
• Volvo Penta TAD731GE MECH, TAD731GE EDC4
• Volvo Penta TAD750GE, TAD750VE
• Volvo Penta TD520GE, TD520VE
• Volvo Penta TD720GE, TD720VE PP
• Volvo Penta TAD532GE EDC4
• Volvo Penta TAD732GE EDC4
• Volvo Penta TAD733GE EDC4
• Volvo Penta TAD751GE
• Volvo Penta TAD760VE