Tighten It Up

Always Use the Correct Tightening Sequences!

When completing a removal and installation procedure, nothing is more important than applying the right torque specification. The “Torque Specification” tables are one of the most popular features in our TruckSeries medium- and heavy-duty truck repair software. Although having the right specification is usually all you need, what about the correct tightening sequence?

Located in most installation procedures, TruckSeries has included tightening sequence graphics for a complete engine rebuild or component replacement. It has coverage of sequences for cylinder heads, flywheels, flex plates, front gear covers, EGR coolers, main bearings, rocker lever covers, oil pans and much more.

Search in the “Installation” step for the required graphics. Selecting “View Full-Screen” on the image allows you to print a copy as needed. Along with the specifications provided in our “Torque Specification” tables, the truck repair information’s tightening sequence graphics ensure your repair is completed using the right specifications, along with the correct sequence.

TruckSeries truck repair torque and tightening specificationsAs mentioned in the Torque Specifications Made Easy blog post, when tightening cylinder head bolts, always pay close attention to the tightening steps indicated in the “Torque Specification” tables or included steps. Sometimes these instructions indicate multiple steps, tightening specifications or instructions to “Rotate” the bolt additional degrees or even loosening it.

Notice in the table below that the Cummins ISB6.7 CM2250 6-cylinder head requires 4 steps, including tightening, loosening, retightening and rotating the bolt additional degrees. With TruckSeries information, you can feel confident that you can complete your repair correctly to get the truck up, running and back on the road as fast and accurately as possible!


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About the Author

Bruce Cansler

Bruce Cansler started his automotive career in 1973 as a technician for Datsun. He retired from the U.S. Navy as a Seabee Construction Mechanic with 20 active years of service and 10 as a reservist, then spent time working in Ford, Lexus and Caterpillar dealerships. Bruce has obtained ASE certifications in both cars and medium/heavy trucks and has worked with the Commercial Vehicle Group at Mitchell 1 since 2009.