Mercury MerCruiser 16779 Remote Oil Filter Adaptor Gasket — 4.3L / 4.3LX V6

Mercury MerCruiser 16779 — Remote Oil Filter Adaptor Gasket, 4.3L / 4.3LX V6

Overview

Mercury MerCruiser 16779 is a genuine OEM adaptor gasket used in the remote oil filter assembly on selected MerCruiser 4.3L and 4.3LX V6 engines. It seals the adaptor area of the remote oil filter stack — not a general-purpose engine gasket. Mercury parts diagrams specify 2 gaskets per service in the remote oil filter assembly where it appears; confirm the quantity from your specific engine diagram before ordering.

Important: Confirm fitment by exact engine model and serial number using the MerCruiser parts diagram for the remote oil filter assembly. Similar adaptor gaskets exist in nearby oil-system assemblies and are not interchangeable.

Compatible Applications

• MerCruiser 4.3L (Gen II) GM 262 V6 — 1992–1995 remote oil filter assembly (confirm serial range)
• MerCruiser 4.3LX (Gen II) GM 262 V6 — 1992–1995 remote oil filter assembly (confirm serial range)
• MerCruiser 4.3L MPI Alpha / Bravo — remote oil filter assembly (confirm serial range)
• Always confirm by exact engine serial number and remote oil filter diagram before ordering

Related Assembly Components

Mercury parts diagrams show 16779 used in the remote oil filter assembly alongside components including:

• Remote oil filter adaptor — 16521001 or 860091T
• Oil filter bracket
• Bypass valve — 22-878050
• Related O-rings, fittings, and seals in the same service area

Inspect all components in the remote oil filter assembly when servicing — replacing related O-rings and seals at the same time avoids a return leak after reassembly.

When to Replace

• Any time the remote oil filter adaptor is removed — do not reuse the original gaskets after the adaptor has been separated
• Oil leaking from the remote oil filter adaptor area
• During routine remote oil filter service where the adaptor is disturbed
• Gasket is visibly compressed, torn, hardened, or no longer forming a complete seal

Installation Notes

• Confirm the correct MerCruiser remote oil filter diagram for the engine model and serial number before ordering — similar-looking adaptor gaskets in nearby oil-system assemblies are not interchangeable
• Parts diagrams specify 2 gaskets for this remote oil filter adaptor application — verify the required quantity from your engine’s specific diagram
• Clean all mating surfaces on the adaptor and filter bracket before installing new gaskets
• Do not reuse the original gaskets after the adaptor has been separated — compressed originals will not seal reliably on reassembly
• Inspect the bypass valve (22-878050), adaptor, bracket, and related O-rings while the assembly is apart — replace any additional worn components at the same time
• Confirm there are no leaks after reassembly before returning the engine to service

Technical FAQ

• Why do I need 2 gaskets? The remote oil filter adaptor assembly on MerCruiser 4.3L V6 engines uses a gasket at each face of the adaptor — one per sealing joint. Mercury parts diagrams confirm the quantity as 2 per service. Ordering a single gasket will leave the job incomplete.
• Can I reuse the original gasket if it looks undamaged? No. Adaptor gaskets compress under clamping load and will not seal reliably if reused. Always replace with new OEM gaskets whenever the adaptor is removed.
• How do I find the right remote oil filter diagram for my engine? Use the Mercury Parts Catalog at the Mercury Marine website, entering your engine model and serial number. Navigate to the remote oil filter assembly diagram to confirm the correct part numbers and quantities before ordering.
• What other parts should I replace at the same time? While the remote oil filter adaptor is apart, inspect and replace the bypass valve (22-878050) and any related O-rings or seals in the same assembly. Addressing all sealing components in one service avoids a repeat job for a nearby leak.

Parts Desk Insights

Best Use Case: This gasket is the right call any time the MerCruiser 4.3L remote oil filter adaptor is being removed for service. It’s a low-cost part that’s easy to overlook, but reusing a compressed original is one of the most common causes of an oil leak callback after remote filter service. Order two — the diagram requires it, and the cost is minimal compared to a return service visit.

Common Issues: The most frequent mistake is ordering only one gasket when the assembly requires two. The second common issue is selecting this gasket by name alone without confirming it is the correct one for the remote oil filter adaptor — similar gaskets exist in nearby oil-system locations and are not interchangeable. A quick serial-number lookup in the Mercury parts diagram is the fastest way to confirm the correct part and quantity before ordering.