NICOclub

The Nissan and Infiniti enthusiast community - Repairs, modifications, resources and much more!

  • Nissan Forums
  • Infiniti Forums
  • Truck & SUV Forums
  • Datsun Forums
  • Marketplace
    • Advertise on NICOclub
    • Advertisers Directory
    • Fabricators’ Marketplace
    • Classified Ads
  • PRODUCT REVIEWS
  • TEST DRIVES
  • SERVICE MANUALS

How to do a compression test on your engine

December 10, 2009 by Aaron

Measurement of Compression Pressure

1. Warm up engine.
2. Turn ignition switch off.
3. Release fuel pressure (See How to Change Fuel Filter)
4. Remove all spark plugs.
5. Disconnect distributor center cable.
6. Attach a compression tester to No. 1 cylinder.
7. Depress accelerator pedal fully to keep throttle valve wide open.
8. Crank engine (let it turn over 7 times) and record highest gauge indication.
9. Repeat the measurement on each cylinder as shown above.
Note: Always use a fully charged battery to obtain specific engine revolution.

Compression Pressure kPa (kg/cm2, psi) / RPM
Standard = 1,236 (12.6, 179) / 300
Minimum = 1,040 (10.6, 151) / 300
Difference limit between cylinders = 98 (1.0, 14) / 300

10. If cylinder compression in one or more cylinders is low, pour a small amount of engine oil into the cylinders through the spark plug hole and re-test compression.

* If adding oil helps compression, piston rings may be worn or damaged. If so, replace piston rings after checking piston.

* If pressure stays low, a valve may be sticking or seating improperly. Inspect and repair valve and valve seat.

* If compression in any two adjacent cylinders is low and if oil does not help compression, there is a leak past the gasket surface. If so, replace cylinder head gasket.

Filed Under: General Automotive, Tuning

Related posts:

Turbocharging and Supercharging
Checking Nissan Knock Sensor Resistance
The Dyno Game – Why dyno charts of aftermarket parts may not be valid
Alcohol and Water Injection – The Basics
Fuel pressure regulator
Nitrous Oxide FAQ
Turbo Tech: Making a Do-It-Yourself Boost Leak Tester
DIY Grounding Kit
Vendor Spotlight: Wiring Specialties
Crossflow or vertical flow intercoolers: Which to choose?

Search NICOclub.com

Sponsor

Nissan Infiniti Online Forums Nissan 240sx technical information Nissan technical information Infiniti technical information Nissan Infiniti Road Tests and Reviews Nissan Infiniti Related Articles Nissan Infiniti Technical Information Articles Nissan Infiniti Events and Shows

Sponsor

Recent News

6 Ways to Prepare your Car for Spring and Summer

Help! My Nissan is stuck in ‘Park’ – Here’s the fix.

Important Info for 2002-2018 Nissan Altima Owners

OnlineTires.com and GLS Shipping Race to the Bottom

D21 Hardbody Rehab and Restoration

Audew Power Station Jump Starter Review

Protect Your Shop During the Pandemic…

The New Nissan Z Proto

Sponsors

Sponsor



NICOclub's Nissan forums and Infiniti forums and all affiliated sites are the property of HDS Holdings, Inc. They are independent publications and are not affiliated with or endorsed by Nissan or Infiniti. Information Copyright © 2000-2021 by NICOclub, all rights reserved. Material may not be copied or reprinted without written permission.

NICOclub Sitemap | NICOclub Privacy Policy

Copyright © 2021 · NICO Club 2014 on Genesis Framework · WordPress · Log in