20397778 Frame | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta lower cylinder-block stiffening frame used on selected D12 engines. The ladder-style frame bolts beneath the cylinder block to increase crankcase rigidity, support main-bearing alignment and reduce structural vibration.

🚤 Compatibility

Typically suits:

• Volvo Penta D12C-A MP
• Volvo Penta D12D-A MP
• Volvo Penta D12D-B MP
• Volvo Penta D12D-C MP
• Volvo Penta D12D-D MP
• Volvo Penta D12D-E MP
• Volvo Penta D12D-F MP
• Volvo Penta D12D-G MP
• Volvo Penta D12D-H MP
• Volvo Penta TWD1240VE

• Engine Family: D, TWD

⚙️ Key Features

• Lower crankcase ladder / stiffening frame
• Approximate overall length 822 mm
• Reinforces the cylinder block around the main-bearing structure
• Used with the specified frame-to-block screws
• Requires clean mating faces and the workshop-manual tightening sequence
• Engine type: Volvo Penta 12-litre diesel
• L=822mm (Volvo assembly listing)

🔌 Function

Increases lower-block rigidity and helps maintain crankshaft main-bearing alignment under combustion and driveline loads.

⚠️ Common Signs of Failure

• Cracks or fretting at the frame-to-block joint
• Abnormal lower-engine vibration
• Main-bearing alignment problems
• Loose or stretched frame screws
• Oil leakage from disturbed lower-crankcase joints

🛠️ Service Notes

• A frame is a structural member — check the surrounding mounts, fasteners and mating faces for corrosion, cracking and elongated holes before refitting
• Offer it up and get everything aligned with the fasteners finger-tight before final tightening, so nothing the frame carries is pulled into strain
• Fit every fastener the frame is designed to take and tighten to the figures in the workshop manual for your engine
• Protect the fitting faces against corrosion where dissimilar metals meet, and refit any rubber mounts, pads or insulating strips
• Recheck the fasteners for tightness after the first period in service, since a frame carries vibration loads continuously

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 8130120 - earlier related cylinder-block reference
• 20412465 - related cylinder-block references
• 20451181 - related cylinder-block references
• 965187 - related frame-fastening screw

📦 Condition

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