Actron 31-255 Compression Tester Instructions

This report mainly focuses on HPE's 3PAR storage arrays. It introduces the functions, features and application scenarios of 3PAR in detail.


Actron 31-255 Compression Tester Instructions - cover page
Brand
Compression
Category
Vehicle maintenance
Document type
User Manual
Language
English
Pages
4
File format
PDF
File size
215 KB
Published
06 June, 2012
Updated
01 October, 2023
MD5 checksum
AA00E01AC70D2900E12CDB6877D51561

About this manual

This document provides step-by-step instructions for performing a cylinder compression test on an internal combustion engine. It covers safety precautions, the procedure for removing spark plugs and connecting the gauge, recording readings, and interpreting results to identify potential mechanical faults such as worn piston rings or defective head gaskets.

The guide also includes troubleshooting tips based on specific gauge behaviors (e.g., needle failing to travel) and provides a list of replacement parts with their part numbers for repairing the Compression Tester itself.

What's inside

  • Test Procedure
  • Installation of Compression Gauge
  • Record compression reading
  • Test Results Interpretation
  • Troubleshooting Low Readings
  • Return to Original Configuration
  • Compression Gauge Repair Parts

Frequently asked questions

How many compression strokes should be cranked?

Crank the engine at least 4 compression strokes until the pressure reading stops rising.

What is the acceptable variation between cylinders?

Readings should not vary more than 10% from cylinder to cylinder.

What indicates a defective head gasket?

If the reading on two adjacent cylinders is 20 pounds or more lower than other cylinders, check for a defective head gasket.

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