valve adjustment 24v cummins
my truck did headgaskets on it this is the last step before having it run
Alright, fellow truck enthusiasts! After tackling a head gasket replacement on my 24v Cummins, I know that getting the engine running again is the ultimate goal. But before you fire it up, there’s one absolutely critical step that often gets overlooked or rushed: the valve adjustment. I learned firsthand just how important this is, and I want to share my process so you can get your Cummins purring like it should. Why Proper Valve Lash is Crucial Especially after a major job like head gaskets, engine components can shift. Proper valve lash ensures your valves open and close precisely, optimizing airflow, combustion, and exhaust. Too tight, and you risk burnt valves and compression loss. Too loose, and you'll get excessive noise, reduced performance, and accelerated wear. For our 24v Cummins, this impacts power, fuel efficiency, and engine longevity. Essential Tools I Used: Gather your tools first. You’ll need a set of feeler gauges (0.010" intake, 0.020" exhaust for many 24v Cummins, but always confirm with your service manual!), a 10mm wrench or socket for locknuts, a flathead screwdriver for the adjuster, a socket for rotating the crankshaft, and a breaker bar. A torque wrench is also useful for precise locknut tightening. My Step-by-Step 24v Cummins Valve Adjustment Process: Engine Cold: This is vital for accurate readings. Let it sit overnight if possible. Remove Valve Cover: Take care to avoid gasket damage. Find Top Dead Center (TDC) for Cylinder #1: Rotate the engine clockwise (from the front) using the crank bolt until timing marks align. Confirm it's on the compression stroke by checking cylinder #1 rocker arms – both should be loose. If tight, rotate another 360 degrees. The 24v Cummins Sequence & Adjustment: At TDC #1 Compression: Adjust intake valves for cylinders 1, 2, 4 and exhaust valves for cylinders 1, 3, 5. Adjusting: Insert the correct feeler gauge (e.g., 0.010" intake). Loosen the locknut, turn the adjusting screw until you feel a slight drag on the gauge – it should slide with some resistance. Hold the screw and tighten the locknut. Recheck. Repeat for exhaust valves (e.g., 0.020"). Rotate 360 Degrees: Turn the engine another full turn (360 degrees) until timing marks align again. You’re now at TDC #6 compression. Adjust Remaining Valves: Adjust intake valves for cylinders 3, 5, 6 and exhaust valves for cylinders 2, 4, 6. Final Check: Quickly re-run your feeler gauge through all adjusted valves. It's worth the extra minute! Tips from My Experience: Visual Guides: If you're a visual learner, search "24v Cummins valve adjustment" on YouTube. Many step-by-step videos exist that can really help. Stay Organized: Keep track of adjusted valves. A simple checklist or marking with a paint pen prevents confusion. "Drag" Consistency: The feeler gauge should have consistent, slight drag across all valves. This takes practice. Listen Post-Start: After reassembly, listen for excessive ticking. A slight increase in noise can be normal briefly, but persistent loud ticking might indicate a loose valve needing re-check. This might seem daunting, but taking your time and meticulously following the sequence for your 24v Cummins will lead to a much happier, better-performing engine. There’s a real satisfaction in knowing you’ve perfectly tuned your truck’s heart!
