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Cummins ISX11.9 CM2250 – Service Manual 007-039   Lubricating Oil Thermostat

Preparatory Steps

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 WARNING 

To reduce the possibility of personal injury, avoid direct contact of hot oil with your skin.
 WARNING 

Some state and federal agencies have determined that used engine oil can be carcinogenic and cause reproductive toxicity. Avoid inhalation of vapors, ingestion, and prolonged contact with used engine oil. If not reused, dispose of in accordance with local environmental regulations.

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Remove

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 WARNING 

To reduce the possibility of personal injury, avoid direct contact of hot oil with your skin.
 WARNING 

Some state and federal agencies have determined that used engine oil can be carcinogenic and cause reproductive toxicity. Avoid inhalation of vapors, ingestion, and prolonged contact with used engine oil. If not reused, dispose of in accordance with local environmental regulations.

Remove the snap ring from the lubricating oil filter head.

Remove the thermostat from the lubricating oil filter head.

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Inspect for Reuse

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 WARNING 

The flash point of new lubricating oil is approximately 221°C [430°F]. Do not allow the oil temperature in the container to exceed 149°C [300°F]. Do not allow water droplets to enter the container of hot oil. Water droplets will cause a violent reaction that can cause personal injury.

Suspend the thermostat and a thermometer with a minimum range of 127°C [260°F] in a container of new lubricating oil. Do not allow the thermostat or the thermometer to touch the sides of the container.

Heat the lubricating oil.

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Record the temperature at which the valve is fully extended. The valve must be fully extended to at least 6 mm [0.250 in] from the closed position when the temperature reaches 127°C [260°F].

Replace the thermostat if it does not operate as described.

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Inspect the valve for damage. Any damage to the front face of the valve will allow oil to constantly bypass the oil cooler.

Replace the thermostat if damage is detected.

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Install

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Install the thermostat into the lubricating oil filter head.

Install the snap ring.

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Finishing Steps

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Last Modified:  03-Aug-2010