Engine Mechanical and Performance Checklist

Engine Compression and Leak-Down Checklist

A cylinder-sealing diagnostic sheet for compression, leak-down percentage and leakage path.

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Checklist Preview

  • Compression: warm engine if safe and disable fuel/ignition
  • Compression: hold throttle open as required
  • Compression: keep cranking speed consistent
  • Compression: record every cylinder reading
  • Compression: repeat low readings before teardown
  • Compression: set piston at TDC compression for leak-down
  • Compression: listen at intake, exhaust, crankcase and cooling system
  • Compression: compare leakage percentage across cylinders
  • Compression: check valve clearance before condemning hard parts
  • Compression: document numbers in final diagnosis

How To Use It

Use this checklist before replacing parts. Work from the top down, record the result of each step, and only move to repair decisions when the failed test is clear.

The downloadable PDF includes checkboxes, notes space, final verification and technician sign-off fields for workshop records.

Download Access

The page preview is public for SEO and learning. The PDF download route is available only to logged-in registered users through the existing Tutor login system.

Tools To Prepare

  • Compression tester
  • Leak-down tester
  • Cooling pressure tester
  • Vacuum gauge
  • Borescope

Evidence To Record

  • Cylinder readings
  • Temperature state
  • Leak path
  • Final comparison

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SEO and Research Notes

This original Motomech worksheet is built from common workshop inspection logic: verify the complaint, inspect safety-critical systems first, measure before replacing parts, document the failed test, and finish with a repeatable road-test or service verification.