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Valve lapping Questions Sand paper
Topic Started: Oct 17 2013, 03:48 PM (603 Views)
thevipofdbz
Advanced Member
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OK guys I lapped 2 valves by hand so far and it seem to take a while. I watched video and know how to hand lap it. SO I was think of a faster way to do this.

I have a 1.3 engine so 8 V

So here it is...
1. Look at valve condition Some had a good amount of imperfections.
2. if it has a good amount of wear get some 600 Grit sandpaper
3. Put valve in drill and Freshen up the valve some against the sand paper held at the correct angle
4. inspected
5. if just about all of the imperfection are gone then hand lap with compound until done right.

I think it would speed think up a lot for me. Seemed like it took me 20 mins on one valve and it still does not look perfect. With the sand paper i think I could get it done much quicker. so the maybe 5-10min per valve?

I got some permatex compound and it look kind of gritting. Was thinking of using Brasso as a final compound to give it a finer finish? thoughts about any of this.
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Old Man


Prepare to send your head out to a professional re-do if you try this.
You can make it shiny. You CANNOT hold the angles and tolerances in this manner.
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Murf 59
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Old Man
Oct 17 2013, 04:46 PM
Prepare to send your head out to a professional re-do if you try this.
You can make it shiny. You CANNOT hold the angles and tolerances in this manner.
:gp Lapping valves takes time. Only thing better is to take it to a machine shop and have the valves and seats ground.
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Johnny Mullet
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Fear the Mullet

If you want to speed the lapping process then use a small rubber hose and a drill. Do not use any other method when refreshing a head.
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Memphis metro


The best short cut is no short cut.
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Old Man


Mr Murf 59
Oct 17 2013, 05:56 PM
Old Man
Oct 17 2013, 04:46 PM
Prepare to send your head out to a professional re-do if you try this.
You can make it shiny. You CANNOT hold the angles and tolerances in this manner.
:gp Lapping valves takes time. Only thing better is to take it to a machine shop and have the valves and seats ground.
t even when they came back from the machine shop I always used very fine lapping compound on each one for about 5 minutes, and then blued each one at 90degree increments.
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