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Engine Thermostat Compatible With Cummins Qsc8.3/Isl8.9/Qsl9 1986-Present 180°F C Series 8.3L 6-Cyl

C5284903A2
OEM PART NUMBERS:
• Cummins: 5284903 (Primary OEM - current number)
• Cummins: 3940632 (Superseded by 5284903)
• Cummins: 4930594 (Cross-reference)
• Cummins: 181890 (Cross-reference)
• Cummins: 3968559 (Cross-reference)
• Cummins: 5274887 (Cross-reference)

SPECIFICATIONS:
• Type: Element
• Opening Temperature: 180°F (82°C)
• Engine: 6C/ISC/QSC 8.3
• Condition: New

PRODUCT NOTICE:
As a parts distributor we mostly sell aftermarket parts (any OEM parts would be noted as such). Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but are designed to function the same as - if not better than - the original. All parts sold are new.

WARNING - This product may expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

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Description

CUMMINS INDUSTRIAL ENGINES:
• Cummins 6C8.3/6CT8.3/6CTA8.3/ISC8.3/QSC8.3 C Series 8.3L Diesel (1986-present)
• Cummins ISL8.9/QSL9 L Series 8.9L Diesel (2004-present)


IMPORTANT:
180°F thermostat for Cummins C Series 8.3L engines (6C/6CT/6CTA/ISC). Supersession: 3940632 → 5284903. Cross-reference: 4930594 is also the same thermostat. The C8.3 is one of the most widely used diesel engines in construction and bus applications.
The #1 ordering mistake: the C8.3 uses a SINGLE thermostat — unlike some larger Cummins engines (ISX/ISM) that use dual thermostats. If you're replacing on an ISC, one stat is correct.
Failure symptoms: overcooling at highway speed (stuck open), overheating under load (stuck closed), temperature gauge cycling between cold and hot (stat opening and closing erratically). On the ISC, a bad thermostat can trigger ECM fault codes for coolant temp out of range.
⚠️ Verify C Series 8.3L (6C/6CT/ISC) — NOT B Series or L Series.

Details

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  • Item Requires Shipping
  • 0.8 lbs.
  • W5.0000” x H5.0000” x L5.0000”
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