Mercury MerCruiser Quicksilver Closed-Cooling Pressure Cap 8148791
In stock items ship same or next day.
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Product Description
Mercury MerCruiser Quicksilver 36-8148791 is the pressure cap used on specified MerCruiser closed-cooling heat-exchanger assemblies. It seals the pressurized coolant-fill connection and is separate from the cap on the plastic recovery bottle.
Key Features
- OEM closed-cooling pressure cap.
- Full part reference: 36-8148791.
- GTIN: 745061312814.
Engine Compatibility
Verified examples include the closed-cooling system on MerCruiser 5.7L GM 350 V8 engines, 1998–2001, serials 0L010037–0M599999. It also appears in specified 5.0L MPI, 350 MAG MPI and 377 MAG MPI EC heat-exchanger assemblies. Confirm the installed heat exchanger and cap callout.
Replacement and Installation
Inspect the cap seal, locking surfaces and filler neck if the system fails a pressure check or shows leakage at the cap. Never remove a pressure cap from a hot cooling system. Follow the engine service manual for pressure testing, coolant level and cap installation.
Parts Desk Insight
The heat-exchanger pressure cap and coolant recovery-bottle cap perform different jobs. Match the pressurized filler location in the diagram.
Manufacturer Parts Lookup
Use Mercury’s official parts finder to check the part against your engine or drive serial number.
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
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.