Tech Tip: DTC P0756 Diagnostic Tips on GM, Hummer and Saab Vehicles
Some technicians may have difficulty diagnosing DTC P0756, 2-3 Shift Valve Performance on 4L60-E, 4L65-E or 4L70E automatic transmissions. As detailed in the service manual, when the PCM detects a 4-3-3-4 shift pattern, DTC P0756 will set. Some customers may also describe a condition of a second, third or fourth gear start that may have the same causes but has not set this DTC yet.
Tech Feature: The Changing Face of Automatic Transmissions
Today’s computer systems have completely redefined automotive operation, particularly when it comes to transmission control.
Mitch Schneider: Sealed, Signed and Delivered
Profit, Productivity and Proficiency are destroyed when parts adversely impact our profit model. It doesn’t matter what the reason – someone is going to suffer and I’ll bet you already know who that someone is going to be.
2011 Valve Train Components Catalog Available from SI Industries
SI Industries, Inc. has published a new 104-page full color catalog that contains details on the firm’s wide line of valve train components. These include stainless steel and titanium valves, bronze valve guides, valve seats, valve springs, valve retainers and locks, plus valve stem seals.
Tech Tip: Piston Pin Spiro Lock Installation Procedures
When the locks are properly seated, only half of the lock will be visible above the groove. Most pistons that require spiral locks will need four locks per piston, two at each end of the pin (check with your piston supplier). When installing Spiro locks, grip each end of the lock and pull apart (approx. 3/8″-7/16″). The lock will resemble a small coil. The lock can then be spiraled into place almost as if you were screwing them into a groove.
Tech Feature: General Motor’s Ecotec 2.0L Turbo Engine
General Motors introduced its powerful Ecotec 2.0L direct
Tech Feature: Sports Compacts – Performing in a ‘Maturing’ Market
What started out in the 1990s as an affordable way for kids to bang around with cars that were often handed down from their parents or siblings, later grew into a fledgling market all its own.
Engine Tech Feature: Choosing the Right Fasteners for the Job
Some of the most stressed-out parts of a high-dollar
Valves: When to Reclaim, When to Replace
Performance engine builders can’t afford to take chances with questionable valves because they have to withstand high rpm and temperatures. Likewise, rebuilders who overhaul high dollar heavy-duty diesel and industrial engines want to minimize their comeback risks by making sure the valves they use are either new or have been carefully inspected and reconditioned to meet OEM specifications. Yet many rebuilders who do passenger car and light truck engines continue to reclaim and reuse a high percentage of old valves.
Tech Update: Gaskets, Seals, Sealants and Fasteners
Some gaskets can go the distance, while others can not. The factors that typically cause a gasket to fail include age, heat, thermal expansion, abrasion, pressure, vibration, corrosion, material breakdown or poor design.
Closing the Gap on Intake Manifold Gaskets
Back in the days when most engines had cast iron blocks, heads and manifolds, the intake manifold could be easily sealed with simple and relatively inexpensive die cut fiber faced metal gaskets (solid or perforated core). Sealer was usually required to ensure a leak-free installation.
Tech Tip: Chrysler 2.0L and 2.4L: Updated Multi-Layer Steel (MLS) Head Gasket Installation Procedures
The MLS gasket was released for production, as a running change, in the 1999 model year for all models except FJ. The new gasket provides superior sealing characteristics, but will require extra care in their installation where a composite gasket was previously in place.