Sea Water Pump 21212799 3812519 | Verified Fitment for Volvo Penta 4.3L

Variant-by-variant fitment check — Each suffix across the 4.3L, 5.0L, and 5.7L Volvo Penta engine families is verified against port orientation and flange pattern before dispatch.

Technical Specifications

Application Suitability

Why the Same Part Number Ships in Multiple Variants Across Engine Families

Superseded numbers and suffix-driven differences mean a sea water pump for Volvo Penta 4.3L 5.0L 5.7L cross reference fitment must be verified engine-by-engine, not assumed interchangeable.

In my years identifying marine parts in Guangzhou, I have seen 21212799 and 3812519 treated as universally swappable across every Volvo Penta gasoline marine engine. That assumption breaks the moment you put a pump from a 5.0GXi-J onto a 5.0GXiC-JF — the suffix C indicates a different cooling circuit layout, and flange hole positions shift accordingly [NEED_CITE: Volvo Penta suffix designation conventions for marine gasoline engines]. Copied cross-reference tables between sellers carry forward these errors without verification. A pump that bolts on but has misaligned ports will crack the housing under vibration, not on the first day but within the first season.

Full Suffix Coverage Across Three Displacement Families

This aftermarket sea water pump for Volvo Penta 4.3L 5.0L 5.7L cross reference fitment spans the complete suffix range — GL, GXi, OSi, Gi, GiC, GXiC, GiE, GXiE, GiI, GXiI, and the V6/V8 base designations. Coverage is not blanket; each variant is mapped to its valid serial range so that a 4.3GXi-JF buyer receives a pump matched to that specific engine build, not a generic unit that "probably fits." When a nameplate is corroded past readability, the engine displacement and suffix letter from vessel documentation become the starting point for verification.

Port Orientation and Flange Pattern Verification

The critical fitment check goes beyond bolt count. Port position on the sea water pump housing determines whether raw water hoses reach their connections without kinking. Flange hole spacing, measured center-to-center, must align within tight tolerance — even a few millimeters of deviation forces the housing under stress during bolt tightening, and that stress becomes a crack path once the engine reaches operating temperature. Before any bulk commitment, a sample unit ships for physical fitment against your actual engine block [NEED_CITE: marine raw water pump installation alignment tolerances]. This eliminates trial-and-error on the vessel itself.

Reading the Specifications That Matter for Raw Water Service

The corrosion-resistant impeller material matters because raw water is not fresh water — salt content accelerates galvanic attack on any dissimilar metal in the flow path. A stainless steel shaft resists the same corrosion at the seal interface, where shaft pitting would destroy the seal lip within weeks. The ISO 9001 quality standard on this pump governs dimensional consistency across production runs, meaning a replacement ordered today matches the one installed last year. For vessels running mixed fleets across 4.3L, 5.0L, and 5.7L blocks, that consistency prevents the need to maintain separate inventory by engine family.

The Hidden Cost of Assuming Interchangeability

A pump that arrives wrong on a vessel already pulled from the water means the haul-out extends by days, not hours. Return shipping on a misidentified sea water pump for Volvo Penta 4.3L 5.0L 5.7L cross reference fitment adds freight cost in both directions. Worse, a pump that bolts on but forces hose connections into a tight bend will fail at the hose, not the pump — and the diagnosis points the wrong direction, delaying the real repair. Forced-fitment stress on the flange is cumulative; it does not show immediately but surfaces as housing fracture after thermal cycling [NEED_CITE: thermal stress cracking patterns in marine pump housings]. Every one of these outcomes costs more than a pre-shipment sample trial.

Why Sourcing Through This Channel Works

Self-produced lines and qualified sourced supply carry identical QC and warranty terms, so you receive consistent quality regardless of which production run fulfills your order. Eight product categories under one account means that when a cooling system job also needs seals, gaskets, or hoses, the full list ships together. Minimum order from one piece supports emergency replacements without inflated quantities. Identification works from a part number, machine model, photograph, or nameplate image — whatever the vessel condition provides. Cross-reference verification covers both superseded and alternate numbers for 21212799 and 3812519. Sample supply for fitment confirmation before bulk commitment removes the guesswork from fleet-wide rollouts.

Documentation & Verification

• Commercial invoice and packing list referencing both part numbers for customs clearance
• Part compatibility and cross-reference sheet marked reference only for 21212799 and 3812519
• Quality inspection record with dimensional check on port spacing and flange hole pattern
• Warranty terms covering 3–12 months against manufacturing defects on this sea water pump
• Packing photographs showing protective wrapping before crate closure
• HS code and customs documentation support for marine parts import

Fitment Check Before Installation

• Compare port orientation on the new pump against the removed unit before hose connection
• Verify flange hole spacing center-to-center matches the engine block mounting face
• Check shaft seal surface for smoothness and confirm impeller rotates freely by hand
• Dry-fit the pump to the block without gasket to confirm bolt alignment before final assembly
• If any dimension does not match, stop and report — do not force the installation

Start With Your Engine Details for Accurate Matching

Send the full engine model code including the suffix letter, the engine serial number if readable, and a photograph of the existing pump or nameplate. If the nameplate is gone, provide the vessel documentation showing displacement and model year. With those details, the cross-reference between 21212799 and 3812519 is verified against your specific engine build, and a sample can ship for fitment confirmation before you commit to a fleet order.

Frequently Asked Questions

Q: How do I confirm this pump fits my specific Volvo Penta engine suffix variant? A: Provide the full model code including suffix (e.g., 5.0GXi-JF versus 5.0GXiC-JF) and the engine serial number. The suffix determines cooling circuit layout and flange configuration, so verification against your exact build ensures the port orientation and bolt pattern match before shipment.

Q: Are 21212799 and 3812519 interchangeable across all 4.3L, 5.0L, and 5.7L models? A: These numbers serve as cross-reference identifiers (reference only) and do not mean universal interchangeability. Each applies to specific engine serial ranges and suffix variants. Verification against your engine code is required to confirm which number is valid for your installation.

Q: My old pump number is no longer listed — is there a verified replacement path? A: Superseded numbers are common across marine engine generations. Send the number from your existing pump along with the engine model and serial. The cross-reference database covers alternate and superseded designations to identify the correct current replacement for your unit.

Q: I only have the engine displacement, not the full model code — can I still order correctly? A: Displacement narrows the field but does not confirm fitment. Provide a photograph of the existing pump, the nameplate if any remains legible, or the vessel documentation. These inputs together allow accurate identification even when the engine plate is corroded.

Q: Can I get a sample to test fitment before ordering for the whole fleet? A: Yes. A single sample unit ships for physical fitment on one engine before bulk commitment. This confirms port alignment, flange match, and hose reach on your actual installation, preventing fleet-wide ordering errors across mixed-vessel operations.