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D2847-22 – Standard Test Method Technical Guide
📋 Scope and Referenced Documents
ASTM D2847-22 is a standard practice that provides an updated procedure for evaluating the corrosion protection and performance of engine coolants in passenger car and light truck service. It closely imitates current vehicle and engine manufacturers’ practices. The practice emphasizes that coolant evaluation in vehicle service requires significant time and expense, so pretesting in the laboratory is recommended using protocols from Specifications D3306, D7714, and D7715.
This standard references several ASTM standards for specific test methods and specifications, which are essential for comprehensive coolant testing.
| 🟦 Standard | 📐 Description |
|---|---|
| D3306 | Specification for Glycol Base Engine Coolant for Automobile and Light-Duty Service |
| D7714 | Specification for Glycerin Base Engine Coolant for Automobile and Light-Duty Service |
| D7715 | Specification for Fully-Formulated Glycerin Base Engine Coolant for Heavy-Duty Engines |
| D2809 | Test Method for Cavitation Corrosion and Erosion-Corrosion Characteristics of Aluminum Pumps |
| D1121 | Test Method for Reserve Alkalinity of Engine Coolants and Antirusts |
| D1287 | Test Method for pH of Engine Coolants and Antirusts |
| D5827 | Test Method for Analysis of Engine Coolant for Chloride and Other Anions by Ion Chromatography |
| D6130 | Test Method for Determination of Silicon and Other Elements in Engine Coolant by ICP-AES |
💡 Tip: Before conducting in-vehicle tests, pretest the coolant in the laboratory using the referenced test methods to ensure general acceptability and save time and resources.
🚗 Test Vehicle Requirements and Coolant Preparation
The test coolant must be a new coolant prepared at the recommended concentration in an aqueous solution using water that complies with the water recommendation in Specification D3306. A minimum of five test vehicles or engines per coolant is required, with ten recommended. However, this number may be adjusted by agreement between customer and supplier.
Test vehicles or engines must have been in service for less than 3 months, 3000 miles, 5000 km, or 500 operating hours. Depending on vehicle mileage or prior coolant in the system, the Original Equipment Manufacturer (OEM) may require replacement of the radiator, heater core, cooling system hoses, and water pump before starting the test. Customer and supplier may also choose to follow OEM specifications.
The cooling system components and coolant are inspected according to a prescribed schedule to provide the basis for coolant performance evaluation.
| 🟦 Parameter | 📐 Requirement |
|---|---|
| Number of Test Vehicles | Minimum 5, Recommended 10 |
| Prior Service Life | Less than 3 months, 3000 miles, 5000 km, or 500 operating hours |
| Coolant Preparation | New coolant at recommended concentration with water per D3306 |
| OEM Replacement | Radiator, heater core, hoses, water pump as required |
⚠️ Safety Warning: Users of this standard must establish appropriate safety, health, and environmental practices and determine regulatory limitations before use. Specific precautionary statements are provided in Section 7 of the standard.
❓ Frequently Asked Questions
🔍 What is the minimum number of test vehicles required per coolant?
A minimum of five test vehicles or engines is required, with ten recommended for statistical significance.
💡 Can OEM specifications override the requirements of this practice?
Yes, the practice allows customer and supplier to follow requirements published in OEM specifications if agreed upon.
⚡ What prior service life is acceptable for test vehicles?
Test vehicles must have been in service for less than 3 months, 3000 miles, 5000 km, or 500 operating hours.
📌 What water quality is required for coolant testing?
Water must comply with the water recommendation published in ASTM Specification D3306.