Engine Rebuild Measurement Sheet
Keep every measurement from an engine rebuild on one sheet, against the spec you built to. The figures are the proof the engine was built right, and the starting point if it ever comes apart again.
GV-40 2 pages
Garage and vehicle workshop · GV-39
Compression and Leak-Down Test Record
A free printable compression and leak-down test sheet: dry and wet readings and leakage for each cylinder, where the air was heard, and a repeat test beside it.
Download Free · no sign-up
One page. Choose your paper size — both versions are laid out identically, so neither one gets shrunk to fit.
Print it and write on it
Fill it in type and save
The fillable versions have real form fields — open them in any PDF reader, type into them and save. Printing help.
What this sheet is for
See the state of every cylinder at a glance, and how it has changed since the last test. A low reading means more once you know where the air is escaping.
Who it is for
Mechanics, engine builders, classic car owners and anyone diagnosing a tired or misfiring engine.
How to use it
- Fill in the engine and the figures you are working to, with where they come from.
- Record the test conditions, then each cylinder's dry and wet compression.
- Leak-down each cylinder at top dead centre and write the percentage and where the air was heard.
- Use the Test B columns for a repeat test later, and write the conclusion at the foot.
What is on the sheet
One page, top to bottom:
Printed under the title: Dry and wet compression and leak-down for every cylinder, with where the escaping air was heard, and room for a repeat test beside it so the engine's condition can be compared over time.
Your figures, every cylinder the same way. No compression figures, leakage percentages or supply pressure are printed. The engine maker's data sets what is acceptable, and cylinders are often judged against each other as much as against a figure. Write the figures you work to in the boxes, test every cylinder the same way, and note whether the engine was warm.
Write-on lines: Vehicle or machine · Engine code · Cylinders · Fuel · Compression spec · Spread allowed · Leakage limit · Figures taken from · Test A: date · Mileage or hours · Warm or cold · Gauge and supply pressure · By · Test B: date · Mileage or hours · Warm or cold · Gauge and supply pressure · By
Readings by cylinder — air heard at: I intake, E exhaust, C crankcase or oil filler, R radiator or coolant
Also printed: Test A · Test B, repeat · Cyl · Dry · Wet · Leak % · Heard at · Notes
Write-on lines: Conclusion · Recommendation · Checked by
Questions
Why are no compression figures printed?
They vary from engine to engine, and the maker's data is the source. Many mechanics also judge cylinders against each other, so the sheet keeps them side by side. Write your own specification and spread at the top.
What do the letters in the Heard at column mean?
They are where the escaping air was heard: I at the intake, E at the exhaust, C at the crankcase or oil filler, and R at the radiator or coolant. Write more than one letter if you heard it in more than one place.
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