Volvo Penta Coolant Pump 3803516 - Special Order
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The Volvo Penta Coolant Pump 3803516 is a freshwater / engine coolant circulation pump used on select Volvo Penta industrial diesel engine applications. This pump circulates coolant through the engine block, cylinder head, oil cooler, thermostat circuit, and heat exchanger or radiator circuit to help maintain correct operating temperature. Current Volvo Penta parts references show 3803516 replaced by 3801578, with 3801578 listed as a coolant pump reman / exchange part requiring a core return.
Key Features
- Volvo Penta coolant circulation pump
- Original part number: 3803516
- Replacement / exchange part number: 3801578
- Related Volvo reference: 21727936, also shown as replaced by 3801578
- Used in the closed coolant side of the engine cooling system
- Factory exchange / reman style part; core deposit may apply
- Associated with Volvo Penta TAD / TD 5-litre and 7-litre industrial engine families
Engine Compatibility
Confirmed application references for the replacement pump 3801578 include:
- TAD520GE
- TAD520VE
- TAD530GE EDC4 / MECH
- TAD531GE EDC4 / MECH
- TAD532GE EDC4
- TAD550GE
- TAD551GE
- TAD720GE
- TAD720VE
- TAD721GE
- TAD721VE
- TAD722GE
- TAD722VE
- TAD730GE EDC4 / MECH
- TAD731GE EDC4 / MECH
- TAD750GE
- TAD750VE
- TAD751GE
- TAD760VE
- TD520GE
- TD520VE
- TD720GE
- TD720VE PP
Additional aftermarket cross-reference data also associates 3801578 / 21727936 with D5A and D7A variants, but final fitment should be confirmed by Volvo Penta serial number and the cooling-system diagram before ordering.
Serial Number Fitment Notice
Confirm fitment using the engine model, serial number, existing pump number, and Volvo Penta cooling-system diagram. This part number has been superseded, so the current ordering path may be 3803516 → 3801578, with core-return handling for the exchange pump. Do not match the pump by appearance alone; mounting pattern, pulley/drive arrangement, gasket face, and engine version must match.
When This Part Needs Replacement
Replace the coolant pump if there is coolant leakage at the pump body or weep area, bearing noise, shaft play, overheating, poor coolant circulation, damaged impeller, corrosion, or repeated coolant loss traced to the pump. A failing coolant pump can cause rising engine temperature even when the thermostat, coolant level, and heat exchanger or radiator are otherwise serviceable.
Installation Notes
Inspect the gasket surface, pulley or drive components, belt condition where applicable, coolant hoses, thermostat housing, coolant filter, and surrounding pipework during replacement. Use the correct coolant mixture and bleed the cooling system fully after installation. Volvo Penta cooling-system documentation identifies the coolant pump as the component that circulates coolant through the engine block, cylinder heads, liner jackets, oil cooler, and thermostat circuit.
Alternate/Superseded Part Numbers
- Volvo Penta 3803516 — original coolant pump reference
- Volvo Penta 3801578 — replacement / exchange coolant pump reference
- Volvo Penta 21727936 — related Volvo reference superseded to 3801578
- Volvo / Deutz cross-reference references: 20726077, 20405685, 4256959, 4256959R, 423173 — verify before use, as these appear mainly in aftermarket interchange data.
Parts Desk Insight
The clean ordering path is 3803516 → 3801578, but the fitment still needs to be checked against the engine serial and diagram. This pump appears across several Volvo Penta 5-litre and 7-litre industrial engine families, so the right match is the current pump number plus the exact engine build, not just the TAD or TD family name.
Special Order — this product is not currently in store inventory but may be available from the Manufacturer. Special Orders may take up to 2 weeks to arrive. Call the parts desk before ordering if you need a closer estimate on delivery time.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.