21105524 Coolant Pump Housing | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta coolant-pump housing used on the D12C-A MP cooling system. The housing supports the circulation-pump bearing and impeller assembly, forms the coolant passages and provides the sealed mounting interface to the engine. Its internal surfaces and machined bores must remain free from cavitation erosion, corrosion and distortion.

🚤 Compatibility

Typically suits:

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

• Engine Family: D

⚙️ Key Features

• Cast coolant-pump body for the D12C-A MP engine
• Supports the pump bearing housing and rotating impeller assembly
• Formed volute and passages direct coolant into the engine circuit
• Machined sealing faces accept the specified gasket and O-rings
• Serviceable separately from the complete coolant-pump assembly
• Engine type: 12-litre inline-six marine propulsion diesel

🔌 Function

Contains and directs the coolant accelerated by the pump impeller while supporting the bearing assembly and sealing the pump to the engine cooling passages.

⚠️ Common Signs of Failure

• Coolant leakage from a corroded housing or sealing face
• Cavitation erosion inside the volute
• Loose or distorted bearing-housing bore
• Repeated gasket failure caused by surface damage
• Reduced coolant flow and overheating from internal corrosion or obstruction

🛠️ Service Notes

• Clean both mating faces without scoring them — avoid steel scrapers and blades on alloy faces, and check the faces for flatness and for corrosion pitting around the ports before assembly
• Renew every gasket, O-ring and shaft seal that comes out with the housing, and fit dry unless the workshop manual for your engine specifies a sealant
• Inspect the housing bore, the seal seat and the drain or weep hole; old or wrongly mixed coolant erodes and pits these housings, and a blocked weep hole hides a failing seal until the bearing has gone
• Check that the impeller turns freely and that the running clearances are within the figures the manual for your engine gives before the housing goes back on
• Tighten the fasteners to the manual torque and in the specified sequence, since an alloy housing pulled down unevenly will distort and leak, then refill with the coolant specification for your engine, bleed the system and run up to temperature to check for leaks at the joint and at the weep hole

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21105524 → Supersedes 3826608

OEM / Related Numbers

• 3826608 earlier number superseded by this part
• 8170833 - pump bearing housing
• 943908 - gasket
• 975687 - O-ring
• 3827303 - housing cap
• 914392 - plug

Other-Brand OEM Numbers

• VOE21105524

OEM Reman Alternatives

• 3803567 - remanufactured bearing-housing reference

📦 Condition

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