I was checking valve lash on a 6.7 Powerstroke for years before a foreman pointed out my mistake

I always set them cold, but he saw me doing it and said, 'You know the book says hot, right? You're off by a few thou.' I had the manual in my box the whole time and just never looked. How many of you guys actually run them up to temp before you adjust, or is cold okay for a quick check?

2 comments

2 Comments

the_wesley6d ago

Learned that lesson the hard way on an old 7.3... checked them cold for ages and wondered why it always sounded a little ticky. Finally bit the bullet and did it by the book hot, and it made a real difference. Metal expands when it's warm, so that few thou really matters. Now I always get it up to temp, even if it takes longer.

iris5746d ago

Used to think cold was close enough, but checking hot on my own truck proved the book right. That small gap change makes a real difference in the sound.