8M0155369 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part
8M0155369 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part
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🔧 Product Description
Genuine Quicksilver Upper Water Pump Housing Gasket - Part Number: 27-8M0155369
A genuine Quicksilver impeller-housing and upper water-pump gasket for selected Mercury and Mariner four-stroke outboards.
The gasket seals the upper pump housing to the adjacent face plate or pump-case surface, helping the impeller maintain cooling-water suction and discharge pressure.
⚙️ Key Features
- Genuine Quicksilver OEM water-pump gasket
- Correct Mercury part number 27-8M0155369
- Upper impeller-housing sealing location
- Used on selected 4HP, 5HP and 6HP four-stroke outboards
- Supplied in complete aftermarket water-pump kits
🚤 Compatibility
Commonly used on
- Mercury and Mariner small four-stroke water-pump assemblies
- Upper impeller-housing and pump-case joints
Typically suits
- Engine models:
- Mercury / Mariner 4HP four-stroke
- Mercury / Mariner 5HP four-stroke
- Mercury / Mariner 6HP four-stroke
- Selected Mercury 75HP to 115HP EFI lower-unit service applications whose pump diagram specifies 8M0155369
- Water-pump kits using impeller 47-8M0204676 and corresponding 16158-series pump components
- HP Range: Principally 4HP - 6HP, with additional serial-controlled EFI lower-unit applications
- Engine Type: Mercury / Mariner four-stroke outboard
- System Type: Upper water-pump / impeller-housing gasket
🔌 Function
The gasket seals the upper pump housing, preventing air and water leakage that would reduce the impeller's ability to circulate cooling water.
⚠️ Common Signs of Failure
- Weak tell-tale flow
- Engine overheating at low speed
- Water leakage around the pump housing
- Gasket damaged during impeller service
- Pump will not maintain pressure after reassembly
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 27-8M0155369 current OEM water-pump gasket reference
- 16158-related earlier pump-gasket family reference
OEM / Related Numbers
- 27-8M0155369
- 8M0155369
- 278M0155369
- MA27-16158009
- UPC: 745061116276
Aftermarket / Verified Equivalents
- Mariner Parts: MA27-16158009
- Aftermarket water-pump gasket: 8M0155369
- Aftermarket impeller kits containing gasket 8M0155369
📦 Condition
- Genuine Quicksilver part
- Brand new
- Supplied in original or equivalent packaging
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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