Volvo Penta Coolant Pump O-Ring 20502536
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Volvo Penta Coolant Pump O-Ring — Part No. 20502536
- Part Number: 20502536
- Brand: Volvo Penta (Genuine OEM)
- Type: Coolant Pump / Water Pump Sealing O-Ring
- Assembly Location: Water Pump and Thermostat Housing
- Quantity per Assembly: 1
- System: Engine Cooling — coolant pump sealing
What This Part Does
This genuine OEM O-ring seals the coolant pump where it mounts to the water pump and thermostat housing on compatible Volvo Penta diesel engines. A failed or damaged O-ring at this location allows coolant to leak externally around the pump mounting area. It is also included in overhaul and cooling-system gasket sets for supported engine families.
Important: Volvo Penta uses several different O-rings in the same water-pump and thermostat-housing assembly — including 21527767, 20459953, and other seals. Always match by part number from the diagram for your specific engine serial, rather than by appearance or size alone.
Compatible Applications
- Volvo Penta TD420VE
- Volvo Penta TAD420VE
- Volvo Penta TAD520GE / TAD520VE
- Volvo Penta TAD530GE / TAD531GE / TAD532GE
- Volvo Penta TAD620VE
- Volvo Penta TAD650VE / TAD660VE
- Volvo Penta TAD720 series
- Volvo Penta TAD730 series
- Volvo Penta TAD750VE / TAD760VE
- Selected Volvo Penta D5A / D7A / D7C engine families
Confirm against your engine serial number and the current Volvo Penta parts diagram before ordering — cooling-system component fitment can vary between closely related engine versions.
Serial Number & Fitment Notice
Multiple O-rings are used within the same thermostat housing and water pump assembly. Matching part number 20502536 to the specific position in the diagram for your engine serial is the most reliable approach. Do not substitute based on appearance or size.
When to Replace
- Coolant leakage visible around the pump mounting area
- Coolant pump removed for inspection, service, or replacement
- Water-pump housing disassembled for any cooling-system repair
- Existing O-ring found flattened, hardened, cut, or damaged on inspection
- Engine overhaul procedure calls for cooling-system seal renewal
Installation Notes
- Clean the O-ring groove and all mating surfaces before fitting the new seal
- Inspect the housing bore and pump mating surface for corrosion, pitting, or damage
- Lubricate the new O-ring only as directed by the applicable Volvo Penta service procedure
- Install the O-ring without twisting or pinching — seat it squarely in the groove
- Refill the cooling system with the correct Volvo Penta-approved coolant mixture after reassembly
- Bleed air from the system and verify there is no leakage after a full warm-up cycle
Related Products
- Volvo Penta Thermostat 82°C 20450736 | D5A D7A D7C TAD Series
- Volvo Penta Cooling System Parts
- Volvo Penta Gaskets & Seals
Parts Desk Insights
This O-ring is the seal that keeps coolant inside the engine at the pump mounting joint — a small part with an outsized consequence if it fails. It’s best replaced any time the coolant pump is removed, since the cost of the seal is negligible compared to draining the system again later. The most common ordering error with cooling-system O-rings is selecting by visual size rather than part number — there are several O-rings in this housing cluster and they are not interchangeable. Pull the part number from the diagram for your specific engine serial to be certain.
Shipping information
In-stock and OEM parts: ship same or next business day.
Supplier-stock items are usually ready for pickup or shipping within 24 hours of ordering.
Special-order timing may vary.
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.