Crusader Thermostat 143°F | OEM Raw Water Cooling | Part R026002E
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Crusader Thermostat 143°F — OEM Part R026002E
Genuine Crusader OEM 143°F (62°C) thermostat for raw water cooled Crusader and PCM inboard marine engines. This lower-temperature thermostat is the correct specification for raw water cooling systems, where it opens at 143°F to maintain proper engine operating temperature and prevent overheating in varying water conditions. It is a direct OEM replacement for the original thermostat in compatible Crusader and PCM engines.
Part Information
- Part Number: R026002E
- Brand: Crusader / PCM
- Official Product Type: Engine Thermostat — 143°F (62°C)
- System: Raw Water Cooling
- Opening Temperature: 143°F (62°C)
Supersession & Cross-Reference
- Current OEM Part Number: R026002E
- PCM Equivalent: RP026002E
- Replaces: 96319, 96051
- Indmar Cross: 985005
- Mercury / Quicksilver Cross: 8M0089715
- Sierra Cross: 18-3551
- Always confirm the correct part number against your engine’s parts diagram and serial number before ordering
Compatible Applications
- Crusader 3.8L / 4.3L V6 engines (Model 165)
- Crusader small block V8 — 305, 350, CH220, CH270, CH350
- Crusader big block V8 — 454, 502 series
- Crusader TB series — TB350XL, TB454XLI, 502XLI
- PCM Ford and GM-based inboard engines where R026002E / RP026002E is specified
- Indmar LT1 applications where 985005 is specified
- Raw water cooling systems only — not intended for closed cooling (heat exchanger) setups
- Always confirm fitment by engine model and serial number before ordering
Serial Number & Fitment Notice
Fitment varies by engine model and serial number. Always confirm compatibility before ordering, especially on PCM and Indmar crossover applications. Use the cross-reference numbers above to verify the correct thermostat for your specific engine.
When to Replace
- Engine overheating or running hotter than normal
- Engine running too cold (thermostat stuck open)
- Temperature fluctuations under load
- Corrosion, sticking, or visible damage to the thermostat
- Preventative replacement during raw water cooling system service
Service Interval
- Inspect annually during cooling system service
- Replace at the first sign of sticking, corrosion, or erratic temperature behavior
- Recommended replacement during any thermostat housing or water pump service
Installation Notes
- Install with the spring side toward the engine
- Replace the thermostat gasket at the same time — see Crusader Copper Thermostat Housing (98202) for related housing parts
- Clean the housing and sealing surfaces thoroughly before installation
- Inspect the water pump and cooling passages during service
- Verify proper temperature operation after startup
Technical FAQ
Why 143°F and not 160°F or 170°F?
143°F thermostats are specific to raw water cooled Crusader and PCM engines. These systems are designed to run cooler than closed cooling systems. Installing a higher-temperature thermostat (160°–170°F) in a raw water system can cause overheating, particularly in warmer water or restricted flow conditions. Always use the temperature specified for your engine’s cooling system type.
Is this the same as the PCM RP026002E?
Yes. R026002E (Crusader) and RP026002E (PCM) are the same thermostat. Both part numbers are interchangeable for compatible applications.
Does this fit closed cooling systems?
No. This thermostat is designed for raw water cooling systems only. Closed cooling (heat exchanger) systems use a different thermostat specification.
Parts Desk Insights
Best Use Case: This is the correct OEM thermostat for raw water cooled Crusader and PCM inboard owners performing annual cooling system service or diagnosing overheating and temperature fluctuation issues. It is particularly well-suited for preventative replacement during water pump service, where the thermostat housing is already open and the additional cost of a new thermostat is minimal compared to the labor of a return visit.
Common Customer Issue: The most frequent issue is customers ordering a 160°F or 170°F thermostat for a raw water cooled engine. These engines require the 143°F specification — a higher-temperature thermostat will cause the engine to run hot or overheat in warm water conditions. Always confirm the cooling system type (raw water vs. closed cooling) before ordering.
Related Products
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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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.
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