PCM Thermostat 170F Closed Cooling R026007

The PCM R026007 Thermostat is a genuine OEM 170F thermostat designed specifically for fresh water cooled (closed cooling) PCM and Crusader marine engines.

This thermostat is installed in the heat exchanger housing, where it regulates coolant flow between the engine and the closed cooling system. The 170F temperature rating is critical for modern PCM engines, ensuring proper combustion efficiency, fuel control, and engine longevity.

Unlike raw water thermostats, this unit is calibrated for closed cooling systems, allowing the engine to run at a higher, more controlled operating temperature. The design includes a bleed hole / bypass feature to help eliminate trapped air and stabilize temperature during warm-up.

This is a direct OEM replacement part, engineered for precise fit and consistent thermal performance under marine load conditions.

Key Features

• Genuine PCM / Pleasurecraft Marine OEM thermostat
• 170F (77C) temperature rating
• Designed for fresh water cooled (closed cooling) systems
• Integrated bleed hole for air purge and temperature stability
• Maintains proper engine operating temperature
• Prevents overheating and cold-running conditions
• Direct OEM replacement

Engine Compatibility

PCM GM-Based Engines (Closed Cooling Systems)

Commonly used on:

• 5.0L (GM 305)
• 5.7L (GM 350)
• 6.0L (GM LS-based / Crusader platforms)

Fits:

• 2004+ PCM engines with serpentine belt systems
• PCM / Crusader engines equipped with factory fresh water cooling (FWC)

Crusader Engine Compatibility

• TB350XL / TB350HT
• MP5.0 / MP5.7
• 5.7 Classic Series (19992005 FWC)
• MP7.4 / MP454XLI
• TB454XL (serial-dependent)

Cross-Platform Compatibility

• Marine Power engines (515411)
• Crusader OEM systems
• PCM closed cooling systems

Serial Number Fitment Notice

Fitment depends on:

• Cooling system type (must be closed cooling / FWC)
• Engine model and year
• Heat exchanger configuration

Always confirm compatibility using your engine serial number before ordering.

Specifications

• Part Number: R026007
• Temperature Rating: 170F (77C)
• Cooling System: Fresh water / closed cooling
• Location: Heat exchanger housing
• Design: Wax-element thermostat with bleed hole
• Installation: Hose-retained (typically no gasket required)

Whats Included

• Thermostat (no gasket required in most applications)

When This Part Needs Replacement

• Engine running too cold or not reaching temp
• Engine overheating in closed cooling system
• Fluctuating temperature readings
• Air trapped in cooling system
• Routine maintenance on FWC systems

Installation Notes

• Install in heat exchanger housing
• Ensure correct orientation (spring toward engine)
• Verify hose retention is secure
• Bleed cooling system after installation
• Confirm stable operating temperature

Alternate / Superseded Part Numbers

OEM Cross References

• PCM: R026007
• Replaces: R026007A
• Crusader: 98203
• Marine Power: 0500-007 / 515411

Shipping

Shipping: Ships same or next day for fast Canada wide shipping.

Parts Desk Insight

This is a closed cooling thermostat onlyif you install this in a raw water system, the engine will run too hot. Always match thermostat temp to cooling type