How to Lap Valves Part 2: Engine Rebuild Part 7

Here I cover valve lapping on a Jeep Wrangler inline 6. The valve lapping process is the same on most all engine heads. This video is intended to show how a beginner can lap their own valves. If you have severe pitting, as I do on these valves, you are best off getting new valves seated at a machine shop. I hope it helps you out.
How to Lap Valves Part 1
• Valve Lapping Part 1: ...
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[@herbiesnerd]

I think you did the lapping as good as it could possibly be done. I’d still recommend a full valve job to you. Now that you’ve got the lapping down, disassemble the new valve job and lap the new valve and seat grinds one pass coarse and fine to seat them perfectly. One thing I’d recommend though, regardless if you get new guides or not, but after you remove each valve during the lapping, I would spray down the valve, seat and guide with brake cleaner, especially the guide between each application of new oil and compound. I wouldn’t risk any compound getting on the valve stem or in the guides. After all the machining and cleaning, no matter what method, scrub down every nook and cranny of the head with HOT soapy water, rinse and dry. One tip I’ve learned about drying ferrous metal is do as much of the drying with towels immediately. Don’t just let them air dry or use compressed air alone. Instant rust will form if you air dry alone. Use compressed air at the very end to dry the tight spots. Mask and paint and you’ll be very happy with your efforts.

[@JeepSolid]

Thanks for the feedback. I appreciate it!

[@simonsidarous1478]

thanks for the awsome clips bro............. that's exactly what i'm doing now

[@johnobiro5202]

That’s the proper way to do it. Nice 1.

[@joe-hp4nk]

I chuck the valves in a drill press and clean them with a wire brush in a drill. It's a great precleaning to lapping. The suction cup is the best way, you get a feel that the valves are seating. When done clean with brakeclean, oil the stems and assemble. To check I fill the chambers with a fluid and blow compressed air into the ports. There should be 0 bubbles. If there is keep lapping till there isn't. I've been doing this for more than 30 years without a problem.

[@theaussie7160]

Like starting a fire would a fire stick bow be more helpfull ? And how much pressure should be used with the compressed air?

[@joe-hp4nk]

@@theaussie7160 That a boy, carry on.

[@mercman2.5]

Reminds me of doing the same thing in '69 to a set of L78 heads in my 66 SS Chevelle

[@electronicscaos]

Tip for even better result: after fine compound, do it a little while without any compound, until the valve make kinda crying sound. It'll polish both surfaces further, and won't leave much microscopic holes to get carbon.

[@danhambrick6331]

They are cleaning up nice...

[@JeepSolid]

Yeah. Turned out better than I expected.

[@renejacques8288]

What grit were the coarse and fine compound? Also, would the coarse grit cause leaks?

[@abderrahmanegouasmi7556]

Nice job. Do we really need to do tapping to new valves. Sole say no need.

[@franktrevino4331]

@ Jeepsolid, those valves did clean up well, but the valve seat is to worn on the angle face. If you look at the lapping mark the cutting line is to close to the edge of the valve, this will cause you to burn up a valve. But method is to have the valve seat cut at a 46 degree and then have the valve cut a 45 follow by a new lap job. This will cause the valve to seat in the middle of the seat. Best of luck

[@JeepSolid]

Thanks for the feedback. I appreciate it. We'll see how this does. I may have to have the head done professionally down the road.

[@XXNINJAKILLERX]

I much rather lap valves by hand. You have more control. Even tho using a drill would faster. Great video

[@JeepSolid]

For sure. Thanks!

[@wesulf7517]

when doing valves like this great tool but using a bow like when starting a fire saves some cramping and you won't get fatigued

[@JeepSolid]

good idea

[@iftinchanneliftinchannel682]

Excellant video how money times you repeat pleas

[@otrjaymardii8755]

How i see it if you can do it i can also and if i mess it up the 1st time at least i learned from my mistake and I will try again 🙂

[@reinaldogonzalez6045]

I think that if you glued a magnet to the suction cup it is less likely to be safe, I will try it in my next project.

[@petericho71]

You could just glue a magnet to a cut down broom handle, but I would imagine that you won't be able to rotate the valve as it will also be magnetised to the seat, in the same way a bunch of paperclips stick together when picked up with a magnet. I'm very interested how you go with this.

[@panagoskakatosis5314]

how time need about one valve??? maybe 10 min??if is like this in video

[@moreoflife1112]

Curious how it runs now/update on how it's holding up?

[@marcnunes6916]

The real fix would be to investigate why although 150k I think that's pretty good considering. Bad stock oil rings and lots of blow by is a good place to start. Install a catch can while you're at it 👍

[@brantjustbrant3516]

Can I bring the entire head to a machine shop? Not just to fix the pitting, but to get the entire thing serviced? I think I lack the confidence to do it right.

[@JeepSolid]

Absolutely! A good machine shop should be able to set you up nice.

[@Flyby-1000]

I would have to use the drill method.... I don't have the time....nor the patients, to do things by hand...lol Took me 3 years to finally install my SYE kit...

[@JeepSolid]

Haha..! Yeah, sonetimes it's tough to find the time.

[@christopherdavis6709]

Would also like to know how to get a sticker from you. I’d sport it here in tn!!

[@JeepSolid]

Awesome! Thank you. Just email me at [e-mail]

[@jwilson6086]

Awesome job. What would be the benefit to this rather then buying new valves? Also sent you an email for a sticker a while back. Keep up the great work.

[@JeepSolid]

This is a good process if you only need to clean up the valve seats a bit. If you buy new valves, the seats should be cut by a machine shop. So sorry I missed your JS decal order. I searched for it and sent you an invoice. Thank you!!

[@leeread5487]

Lapping the valves will result in a concave/convex surface on the valve/head when the engine is at operating temperature. This is due to different thermal expansion of the valve/seat (the valve operates at a higher temperature). This will result in less sealing.

[@michaelhayward7790]

Valve lapping is an essential part of an engine rebuild, and must be performed even when installing new valves, to match them to the head.

[@shimon2476]

Always a critic

[@leeread6757]

@@shimon2476 Just my opinion.. thanks.

[@shimon2476]

@@leeread6757 From your exp lapping is worst than leaving the valve unlapped?

[@leeread6757]

@@shimon2476 I think it's better to have a machine shop grind the valves/seats. In my experience very few machine shops lap valves.

[@wegngis]

It's common to have putting like that?

[@JeepSolid]

On these older Wranglers, Yeah, pretty common.

[@sidepocketlouie590]

Do new valves have to be lapped

[@abadmixtape]

I realize your comment is 7 months old, but yes, new valves need to be lapped

[@maanviri84]

Do you lap the valves with the stem oil seals on the head?

[@shimon2476]

Def no! Oil seals must not be install

[@renejacques8288]

@@shimon2476 Would lapping destroy the oil seals even if the seals were new?

[@shimon2476]

@@renejacques8288 I won't recommend lapping with the new seals on the constant rotation may weaken the sealing spring on the seal but that's just in extreme cases I guess

[@sidepocketlouie590]

Why not just put new valves in?

[@timhoneycutt1367]

$$$

[@pharezknights5467]

I thinked you lapped it too much, it should have a small 45 degrees on the face and seat, you almost remove the valve margin, a small amount of pitting is safer than a flat valve face, if it got pitting lap it then check for leaks, if it doesn't leak with the little pitting your ok, lapping is just to make sure it doesn't leak, when its grinded top much and loose the 2 angles its more likely it would leak because the air only got one smooth straight part to slip in not the the 2 angles it gotta try and pass to get in.

[@timhoneycutt1367]

The angle will be the same as the seat so doesn't matter as long as it doesn't leak and the air flows

[@rightlanebandit9844]

Your seat is too wide you need to machine the seats