Can you lap valves with a drill

Typically umbrella types are sufficient. Have fun! Joined: Aug 13, Posts: 6, Profile Page. Depending on the age and hours on the heads your most likely gonna need guide work The old Mechanics would never tolerate someone trying to lap a valve with a drill on the stem. Use a lapping stick with a suction cup so that you turn it back and forth gently with the stick between both hands like Ugg the caveman starting a fire Makes it easy to pop it out and check progress as you go Keep the compound off the stem.

The guides don't need a lapping! If inspection of the guides shows minor wear that you don't want to deal with right away, the umbrella seals will help control the oil a little better but won't last forever. As they get harder from the hot oil, the lose valve stem fit will hog them out and you'll get some oil burning again.

Hackerbilt , Apr 13, Profile Page. Joined: Jun 5, Posts: 8, Profile Page. I always do it - even on a fresh valve job. You've got nothing to lose - it's not like you're going to sink the valves into the head! Flat Ernie , Apr 14, Joined: Jun 5, Posts: 1, Profile Page. On a quick overhaul its ok. On a fresh valve job, it is never acceptable! I think its a sign of a machinist with no self confedece or no tallent.

Lucky Strike , Apr 14, Login Digital Edition Buy a Subscription. Forums » Grassroots Motorsports » Lapping valves. How long do you hold the trigger? And both directions or just one? Jump To This '65 Mustang hides a modern secret underneath. Your Projects. What bit of maintenance are you putting off right now? Is this the fastest Time Attack A90 Supra?

How to manage tire temperatures for improved on-track performance. Featured Readers' Ride Wildchild's Midget. Try Our Other Magazine. I've used the drill method to lap valves, and had it work pretty well.

That was over 40 years ago, so it might work even better with a variable speed reversible drill. I learned it from my uncle who was a used car "doctor". I just used a piece of hose slipped over the valve and a similar sized drill bit leaving about 3 or 4 inches of flexible hose.

The drill was hand-held with a little pulling pressure on the valve. There are better ways, but probably not faster ways to lap the valves. I don't want to be a downer, but you ask if there is a valve guide wear spec, and I'm sure there is. My advice would be to find that spec, check your guides, and be gentle with your valves and seats. The guides "guide" the valves, reaming tools, etc If the guides are worn and you go forcing your way through this process by using more than the basic hand held valve lapping stick, you're going to goof things up.

No, I do see your point entirely. I was feeling a little nervous about side loading the valve guide. I labeled and segregated the valves to keep track of their location. Thanks for the confidence on the crud built up on the exhaust side Kenny.

I mentioned it in another thread, but I'm trying to do this in real turbobricks style on the cheep. So the less that I need to pay a machine shop the better.