How to Install BK Racing Inner Balance Shaft Delete Sleeves
How to Install BK Racing Inner Balance Shaft Bushing Delete Sleeves
Installing the BK Racing Inner Balance Shaft Delete Sleeves is one of the final steps when performing a complete balance shaft removal on a GM Ecotec engine.
Unlike methods that require relocating the factory bearing race, the BK Racing Inner Sleeves install inside the original factory bearing race, allowing it to remain exactly where GM installed it while permanently sealing the required oil passages.
The sleeves were designed to simplify installation, remove unnecessary installation variables, and provide a controlled, repeatable solution for complete Ecotec balance shaft deletes.
This guide explains the installation process and shares a few tips we’ve learned through years of building Ecotec race engines.
Before You Begin
Before installing the Inner Balance Shaft Delete Sleeves, verify that:
- The balance shaft assemblies have been completely removed.
- The factory inner bearing races remain installed in their original locations.
- The bearing races are clean and free of oil, debris, and burrs.
- The oil passages have been inspected.
- The block has been thoroughly cleaned after machining.
Proper preparation is one of the most important parts of the installation.
Freeze the Sleeves Overnight
One of the easiest ways to simplify installation is to place the Inner Sleeves in a freezer overnight.
Cooling the sleeves causes them to contract slightly.
Although the change in size is very small, it is enough to make installation noticeably easier while preserving the proper interference fit once the sleeves return to room temperature.
This is a common technique used throughout the automotive industry when installing precision interference-fit components.
Clean the Bearing Races
Before installation, thoroughly clean the inside of the factory bearing races.
Remove:
- Oil
- Assembly lube
- Dirt
- Metal chips
- Any remaining debris
The sleeves are designed to install into clean, dry bearing races.
A clean surface allows the precision-machined interference fit to work exactly as intended.
Position the Sleeve
Each BK Racing Inner Sleeve features a tapered lead.
This taper helps the sleeve start square in the bearing race while reducing the chance of cocking during installation.
Carefully align the sleeve with the factory bearing race before applying any installation force.
Take a few extra seconds to ensure the sleeve is straight before driving it into place.
Installing the Sleeve
Many builders find it easiest to tape the sleeve to a large socket that closely matches the sleeve diameter.
Attach the socket to a suitable extension and use it as a driver.
The tape simply helps keep the sleeve centered while it is started into the bearing race.
Because the sleeve includes a tapered lead, it naturally begins aligning itself as installation begins.
Apply steady, even force until the sleeve seats fully.
Avoid striking the sleeve at an angle.
Alternative Installation Method
Each BK Racing Inner Sleeve includes a threaded center.
This allows builders to install the sleeve using a threaded rod and suitable washers if preferred.
The threaded center can also be used later with a standard slide hammer should removal ever become necessary during future engine service.
Final Inspection
After installation, verify:
- The sleeve is fully seated.
- The sleeve is square in the bearing race.
- The oil passage has been properly sealed.
- No damage occurred during installation.
Once both sleeves have been installed and inspected, the balance shaft delete portion of the engine can be considered complete.
Why We Don’t Relocate the Factory Bearing Race
One of the most common questions we receive is why we designed the Inner Sleeves to install inside the factory bearing race instead of relocating the bearing race itself.
The answer is simple.
We wanted to eliminate unnecessary installation variables.
By leaving the factory bearing race exactly where GM installed it, the builder no longer needs to determine how far the race should be moved or worry about driving it in crooked or damaging it during installation.
Instead, the precision-machined sleeve performs the sealing function while the factory bearing remains in its original location.
For us, that creates a more controlled and repeatable installation.
Common Installation Mistakes
Most installation problems are easy to avoid.
Common mistakes include:
- Installing into dirty bearing races.
- Forgetting to freeze the sleeves before installation.
- Driving the sleeve in at an angle.
- Using excessive force when the sleeve is not properly aligned.
- Attempting to install over debris or burrs.
Taking a few extra minutes during preparation makes installation much easier.
Designed for Builders
The BK Racing Inner Balance Shaft Delete Sleeves weren’t designed to be another generic oil passage plug.
Every feature was intentionally engineered to make installation easier.
Features include:
- Precision-machined interference fit
- Tapered lead for easier alignment
- Threaded center for installation and removal
- Designed to work with the factory bearing race
- Permanent oil passage sealing
Those features don’t just simplify installation.
They help create consistent results from one engine to the next.
The Bottom Line
Installing the BK Racing Inner Balance Shaft Delete Sleeves is a straightforward process that completes one of the most important steps of a full Ecotec balance shaft removal.
By leaving the factory bearing race in its original GM-installed position and sealing the oil passage with a precision-machined interference-fit sleeve, the installation becomes cleaner, more repeatable, and easier for engine builders.
Freeze the sleeves, prepare the bearing races carefully, take your time during installation, and you’ll have confidence knowing the oil passages have been sealed correctly for years of reliable service.
Frequently Asked Questions
Should I freeze the sleeves before installation?
Yes. We recommend freezing the sleeves overnight. Cooling them slightly contracts the material, making installation easier while maintaining the proper interference fit after they return to room temperature.
Do I remove the factory bearing race?
No. The BK Racing Inner Balance Shaft Delete Sleeves are designed to install inside the factory bearing race. The bearing race remains in its original location.
Can the sleeves be removed later?
Yes. The threaded center allows removal with a standard slide hammer or threaded rod if future engine service requires it.
Do I need any special tools?
No. Most builders successfully install the sleeves using a large socket, an extension, and a small amount of tape to hold the sleeve square while starting the installation. Alternatively, the threaded center allows installation using a threaded rod and suitable hardware.
Continue Learning: What Does an Ecotec Balance Shaft Delete Actually Change?
Understanding how the GM Ecotec balance shaft system works is the first step in deciding whether a balance shaft delete is right for your engine. As you've learned, GM engineered the system to reduce second-order engine vibration and improve refinement in production vehicles. However, the demands placed on a dedicated race engine are very different from those of a daily driver, which is why many performance builders choose to remove the balance shaft assembly entirely.
Not all balance shaft deletes are the same. Cut shafts, neutral balance shafts, complete balance shaft removal, and short-chain delete systems each affect the engine differently. Choosing the right approach depends on your performance goals, intended use, and how the engine will be operated.
Whether you're performing a complete balance shaft delete or a short-chain conversion, selecting the correct components is just as important as understanding the modification itself. Depending on your chosen method, you may need BK Racing Complete Balance Shaft Delete Kit, Outer Balance Shaft Bushings, Inner Balance Shaft Delete Sleeves, Modified Upper Short Chain Guide, Shortened Water Pump Chain, and other supporting components to complete the installation properly. If you're performing a complete delete, don't forget to add the BK Racing Inner Balance Shaft Delete Sleeves to your order—they're a required part of a proper installation.
The next guide explores what actually changes after removing the balance shaft assembly, including rotating mass, parasitic losses, vibration, engine reliability, and why balance shaft deletes have become a common modification in naturally aspirated, turbocharged, supercharged, and circle track GM Ecotec engines.
Continue Reading
- GM Ecotec Balance Shaft Delete Guide
- What Does an Ecotec Balance Shaft Delete Do? Pros, Cons, Power & Vibration Explained
- Can You Delete Ecotec Balance Shafts on a Street Car?
- 2.0, 2.2 & 2.4 Ecotec Balance Shaft Delete Guide
- Ecotec Balance Shaft Delete Comparison: Cut Shafts vs. Neutral Shafts vs. Short Chain Kits vs. Complete Removal & Delete Plugs
- Do Ecotec Balance Shaft Deletes Cause Vibration? Separating Fact from Fiction
- Complete Ecotec Balance Shaft Removal Guide
- BK Racing Inner Balance Shaft Delete Sleeves Explained: Why We Leave the Factory Bearing Race in Place
- Why Cutting Ecotec Balance Shafts Can Lead to Engine Failure
- Neutral Balance Shafts vs. True Ecotec Balance Shaft Delete