Lapping works good, just more work, and prolly unnecessary if the valves aren't leaking already. If the valves are leaking, it's usually due to mis-alignment caused by worn guides.

Can you lap valves too much?

Although some seats may need two or three times of lapping, it is not necessary or good to over-lap the valves. It is unlikely, but possible, to remove too much, and doing so will ruin the valve seat. If you are unable to achieve a consistent grey ring, the seats are probably worn out and will require cutting.

Is valve lapping effective?

The current methods used in most automobile maintenance businesses for valve lapping process are not effective and consume a lot of working hours. 'Valve lapping Machine for Internal Combustion Engines' is a machine designed to overcome these problems by minimizing the human involvement in the process.

Should you Lap new valves?

New seats, with new valves should require no lapping to get a good seal - my machinist refuses to lap in the first place, considering it to be a half-baked solution.

How long should you lap valves for?

The lapping process for each valve should take less than a minute if the valve seat and face were ground correctly.

Lapping Valves, What Is That? | Should I Lap My Valves? [HPA Q&A]

19 related questions found

Should you Lap new valves in old head?

Valves should be lapped to seats, just clean up VERY well. Same with cylinder honing...you have to clean up very well.

Can you lap old valves?

If you do the valve job or just clean them up, you may cause more damage than good. It is a good time to replace the valves. If you have to do that, you will need the valves lapped. ...

How much does it cost to get valves lapped?

Therefore, a total valve job can cost upward of $1000. Know what price you should pay to get your vehicle fixed. The average cost for a valve adjustment is between $246 and $336. Labor costs are estimated between $220 and $278 while parts are priced between $26 and $58.

Why is valve grinding important?

A valve grind (commonly referred to as a valve job or valve lap) can be crucial for proper functioning valves/seals. It is the process of smoothing out the engine valves so that they are effectively able to seal in the valve seat in the cylinder head to completely seal the engine's combustion chamber.

Can I do a valve job myself?

valves can be done very easily. you can get a valve seat grinder and do those yourself and you can replace the seals too.

How do I know if my valve seat is hardened?

A lot of times it is very difficult to see them once a head has been run. What you are seeing is probably just a machinig mark from when the valve seats were cut at the factory. I would look at the date code on the heads. If they are 1973 or newer, they should have hardened seats.

What is the purpose of lapping?

Lapping can be used to obtain a specific surface roughness; it is also used to obtain very accurate surfaces, usually very flat surfaces.

Can I reuse my valves?

If you simply regrind and reuse the valves without replating them, the valves may stick or gall when the engine is first started or if it overheats. Some engine rebuilders will reuse the intake valves but replace the exhaust valves (because the exhaust valves run hotter and are more vulnerable to failure if reused).

What does a valve lapper do?

This means the tool is attached to the valve head, lapping compound is applied to the valve seat or the valve face and the tool is rotated left and right to lap the valve to the seat. It's kind of like trying to start a campfire by spinning a stick fast enough to create enough heat to ignite your kindling.

Is valve grinding compound the same as lapping compound?

Those are just 2 different words for the same thing.

What can I use instead of valve lapping compound?

Use auto paint rubbing/buffing compound, it is a finer grit and I think it does a much better job.

What is a lapping compound?

Lapping is a controlled mechanical process of polishing or sanding that utilizes an abrasive compound between two surfaces, usually referred to as plates. The surfaces rub together to produce an accurate finish on a specific part. Lapping can be one- or two-sided, depending on the application for the part and material.

What is a lapping machine?

Lapping machines are a type of precision finishing machine. ... The slurry forms an abrasive film between the underlying lapping plate and the parts to be lapped. The part stock is gradually removed through the rolling and sliding action of the abrasive grains between the lapping wheel and the workpiece.