When a diesel engine compression pressure is...

Question 1 of 270705eccefa1bacbc34ba4d473fb

When a diesel engine compression pressure is checked, the indicator is connected to the __________.

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Question 1 of 27070

Q

When a diesel engine compression pressure is checked, the indicator is connected to the __________.

🔍 Key Concepts

• Compression testing on diesel engines measures pressure developed inside the cylinder during cranking • The gauge/indicator must be connected where it can directly sense cylinder pressure during the compression stroke • Know the purpose and location of indicator cocks, exhaust ports, injection lines, and banjo oiler lines

💭 Think About

• Ask yourself: during the compression stroke, where in the system will the true cylinder pressure be present and safely measurable? • Which of these locations normally carries high-pressure fuel, not compressed air, and would be unsafe or incorrect to tap into for a compression test? • Which fitting or opening on a diesel is specifically provided so you can observe/measure pressure inside the cylinder?

✅ Before You Answer

• Identify which option is a direct opening into the combustion space of the cylinder • Eliminate any choice that is part of the fuel system rather than the air/compression space • Eliminate any choice that is primarily for lubrication or exhaust discharge, not for pressure indication