21245957 Crankshaft | Genuine Volvo Penta Part

🔧 Product Description

A complete precision-forged crankshaft used in later-production Volvo Penta D7, TAD7 and TD7 diesel engines. It supersedes multiple earlier crankshaft references through documented engine serial breaks.

🚤 Compatibility

• Engine Family: TD, D, TAD
• Serial Range: (Gear Included) SN 10103093-

Full model list at the end of this description.

⚙️ Key Features

• Precision-ground main and connecting-rod journals
• Later service replacement in a multi-stage supersession chain
• Supports standard and undersize service bearings
• Direct replacement where part number 21245957 is specified
• Engine type: Six-cylinder turbocharged diesel

🔌 Function

Converts piston movement into rotational power and transmits engine torque to the flywheel.

⚠️ Common Signs of Failure

• Deep crankcase knock
• Cracked or scored journals
• Excessive crankshaft end float
• Repeated main or connecting-rod bearing failure
• Abnormal engine vibration

🛠️ Service Notes

• Fitting a crankshaft is a full bottom-end job — the block, bearing housings and oil ways all want checking, and the journals measuring for size, taper and ovality, before anything is assembled
• Wash out every oil way in the new shaft and blow it through; swarf or preservative left in a gallery will destroy the new bearings
• Fit new main and big-end shells and thrust washers, and check running clearance and crankshaft end float against the figures in the workshop manual for your engine rather than assuming they are right
• Oil the shells and journals on assembly, tighten the bearing caps in the sequence and to the tightening figures and angles specified for your engine, and turn the shaft by hand after each cap to confirm nothing binds
• Renew the front and rear crankshaft seals, inspect the flywheel, damper, pulley and their fasteners while the access is good, then prime the lubricating system and confirm oil pressure before the engine is run up under load

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21245957 → Supersedes 20875042 → Supersedes 20790461 → Supersedes 20724015 → Supersedes 20412323

OEM / Related Numbers

• 20875042 earlier number superseded by this part
• 20894544 earlier number superseded by this part
• 20790461 earlier number superseded by this part
• 20724015 earlier number superseded by this part
• 20412323 earlier number superseded by this part
• 21141948 - standard main bearing
• 21234191 - 0.25 mm undersize main bearing
• 20405541 - 0.50 mm undersize main bearing
• 20405899 - thrust-bearing kit

📦 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 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 TD720GE, TD720VE PP
• Volvo Penta TAD732GE EDC4
• Volvo Penta TAD733GE EDC4
• Volvo Penta TAD751GE
• Volvo Penta TAD760VE