Mercury MerCruiser Quicksilver Exhaust Manifold Front End-Cap Gasket 39917
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Product Description
Mercury Quicksilver 27-39917 is the gasket for the front end-cap/connector joint on specified legacy MerCruiser exhaust manifolds. The matching diagram also describes this location as the water-distribution-block connection.
Key Features
- OEM number: 27-39917.
- Front manifold end-cap/connector sealing location.
- Distinct from rear end-cap gasket 27-39923.
Compatibility and Fitment
A verified application is MerCruiser 120 GM 153 I/L4, 1979–1982, serial numbers 5192049 through 6229717, exhaust-manifold/end-cap/elbow assembly position 21. Earlier 120 and selected 160 exhaust systems also use this number; match the end cap and cooling layout.
Replacement and Installation
Replace when the end cap is removed or its joint leaks. Inspect the cap and manifold sealing faces for corrosion and check that the coolant openings align before tightening.
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Parts Desk Insight
Front and rear end-cap gaskets can look similar while serving different water connections. Match 39917 to the front connector callout rather than ordering by outside shape.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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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.
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Important:
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