Metal on the Dipstick: When to Worry

What's normal

Every Velvet Drive wears a little internally, and a fine dusting of metal on the dipstick is part of that. What changes the story is size and quantity: actual chips, or a dipstick that looks like it's been dragged through metal filings, not a few flecks.

Where the metal actually gets caught

On a 71/72 series cast-iron unit, if you pull the cooler return plug and find a spring and a washer behind it, throw them away; they don't do anything. There's a magnet down in there that does the real work. As Chris puts it, a filter has never stopped a transmission failure. See filter and magnet locations by model.

Rubber vs. metal

If what you're finding is rubber rather than metal, that's the factory's own tell for cooler-line wear inside, not a clutch or gear problem. Pull the cooler lines and check them rather than tearing into the transmission first.

After any failure

Once a transmission has actually failed, metal gets into places a dipstick check won't find: the cooler and the cooler lines. The factory says to flush both after any failure. We go further and replace the cooler, because you can't flush all the metal out of one; see replacing the transmission cooler.

What large chips usually mean

Bigger pieces on the dipstick line up with the kind of damage we see on teardown: welded clutch plates, a cut piston, chipped gear teeth. See impact damage vs. normal wear for what that looks like once it's apart.

When to call

Finding more than a few flecks on the dipstick? Call (804) 333-3677, Monday through Friday 9 to 3 Eastern, or email sales@halemarine.com.

Related reading: impact damage vs. normal wear, filter and magnet locations and the full troubleshooting guide.