Recmar MerCruiser V6 V8 Closed Cooling Thermostat 160°F 99155T1
REC99155T1
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MerCruiser 160°F Thermostat Kit 99155T1
GM V6 & V8 | Closed Cooling | 1998 & Newer
Aftermarket 160°F (71°C) thermostat and seal replacement for 1998-and-newer MerCruiser marinised GM V6 and V8 engines equipped with closed/fresh-water cooling and specified for Mercury/Quicksilver 99155T1.
Key Features
- 160°F / 71°C thermostat
- For closed/fresh-water-cooled MerCruiser systems
- 1998-and-newer GM-based V6 and V8 application
- Replaces Mercury/Quicksilver 99155T1
- Recmar aftermarket kit
Technical Specs
| Part type | Thermostat kit |
| Opening temperature | 160°F / 71°C |
| Cooling system | Closed / fresh-water cooling |
| Engine family | MerCruiser marinised GM V6 and V8 |
| Application era | 1998 and newer |
| 4Boats SKU | REC99155T1 |
Compatibility / Fitment Guide
| Engine / system | Verified application | Fitment notes |
|---|---|---|
| MerCruiser GM V6 | 1998+ marinised GM V6 engines with closed cooling requiring 99155T1 | Verify serial number, housing and 160°F specification. |
| MerCruiser GM V8 | 1998+ marinised GM V8 engines with closed cooling requiring 99155T1 | Includes applicable small- and big-block installations only when listed by part number. |
| Not suitable | Raw-water-cooled V6/V8 systems; 496/8.1L applications using a different thermostat; outboards | Cooling-system architecture must match. |
Do not order by engine capacity alone. Match the complete Volvo Penta/MerCruiser model suffix, cooling-system type and original part number in the engine parts catalogue.
Part Number Cross Reference
| Mercury / Quicksilver | 99155T1 |
| Thermostat reference family | 99155A1 / 991551 |
| GLM | 13421 (application kit) |
| 4Boats / Recmar SKU | REC99155T1 |
Cross-reference numbers indicate the application family; this item is a Recmar aftermarket replacement, not a genuine Volvo Penta, OMC or Mercury/Quicksilver part.
Frequently Asked Questions
Is it for raw-water cooling?
No. The verified 99155T1 application is for closed/fresh-water-cooled GM V6 and V8 engines.
What year range fits?
Mercury specifies 1998 and newer, subject to the engine serial-number parts catalogue.
What is included?
The 99155T1 application normally comprises the thermostat and seal; compare the listing photograph before ordering.
Installation note: Allow the engine to cool, inspect the housing and sealing surfaces, and pressure-test/check for leaks after installation. Professional installation is recommended.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
