Step 3: Whats need to grind yer valves good"!

General directions for grinding valves on most engines with out expensive tools and with the know how to accomplish a very good job you will need a few simple things like
1.hand drill ( 300-400 rpm)is best
2. valve grinding compound
3. a glass or bowl of water
4. cleaner for parts ( carburetor spray helps)
5. oil or grease
6. paper towels or cotton clothe
7.Possibly a sheet of 180 carborundum wet /dry sandpaper
8. probably new valve stem seals
9. a lot of time if you are doing the whole head
10. may bey 2 hand drills can speed grinding
11. basic comprehension of physics involved
12. safety eye lenses 
 13. Awareness of which valves you intend to grind if not all
buhdieboy (author) 8 months ago

the thing is if your aluminum head motors the ones with seats ran good befor you had a proublem say a sliped timing belt or chain but now there vaves bent just get new valves and lap them in but if you suspect that a seat has droped then it would have acted funny and you will need anouther head to make matters sound very short the carborundom thing is only for highly aged heads that have warped seats from overheating (differant proublems folks pay attention!)

buhdieboy (author) 8 months ago

use a number two pencil to draw lines on valve seat on clean seat the insert clean valve into matching seat and twist the valve 1/4 inch only back and forth. If only half the lines are smeared then you have a misalinement of face to seat (understand?) if say 7/8ths of the lines are smeared simply grind some more then recheck it will most like grind out the old pencil line method will not lie

depayton7 years ago
Will this work on alum heads?
buhdieboy (author)  depayton7 years ago
obviously yess as aluminum heads have steel seats i need to do a chapter on the specifics of aluminum head peculiaritys, if you had overheating problems you will most likely need to have head pressure checked at a machine shop and have it milled levil otherwise you may be waisting your time but if you have the time too gamble th 70- 80 dollars for pressure checks and milling then go for it i have several times its been a 60/40 win loose or temporary fix toss up, also what differeces are you looking at from normal pressure for the given engine if you say? you have dropped (lower) 40 lbs on certain cylinders but have normal compression reading on 2 or more cylinders this says something to the expeirianced mechanic it indicates a bent valve or badly burnt valve (rarely seat)or a crooked or dropped seat or a stuck (ie bent or rusted)valve agin\ain much of what you will expect to find depends on the outher valve components its not impossible for the valves to be to tight on the lash or set wrong these are things experiance and familiarity will teach most importently beware especially on certain v-6 engs if the manual say set the engine piston #1 to some position outher then TDC or you will bend a valve when you bolt a head down but many cars you will need too set your timing marks on the head to the pictured position in manual the set the crankshaft to the normal marked position (most engs TDC*)before tightening the head bolts
I had a broke timing belt on an interference engine. Only two pistons had compression (180lbs+). Took the heads off, 8 bent exhaust valves that I could identify. Thanks for the insight but I just broke down and took them to a machine shop for testing and a valve patch job. In order to install he heads on this application, it says to set the crank to tdc then turn the crank counter clock wise 3 notches to install without more valve damage. Then once everything is installed put the crank on its mark as well as the cams and put the timing belt on. Does this sound right to you? this is my first head job.
buhdieboy (author)  depayton7 years ago
180 lbs is funny to high for a reg street engine has something spliedinto those cylinders i would expect 85 to 130 140 outside depending on cc and year your gauge may be off it used to be if a car had 90 it wasnt likely to start without pulling , pushing it 30 mph but some nissans got low cranking comps like 70-80! i guess its a tricky area oin that model most engines where expecting upward of 95psi. and more in general @cranking speed one thing here is always disconect the coil plug or wires befor testing comp if youi dont it may dammage your guage folks
buhdieboy (author) 7 years ago
testing the valves for proper seating is possible if you seats are so hard in aluminum heads if the are worn or warped in the head it will be difficult for a novice to manage but i have discribed a way to acheive a fix remember more then likely your proublem will be on(certain) the exhaust valve/s tharby reduceiing some of the concerns for the aluminum heads intake seats i said more than likely so..with cast seats remeber the intakes are way more vulnerable to pitting if the motor set or had high milliage... anyway!
rmdc17 years ago
Looks great. But do you have to use only Carborundum paper? What about 3M. I cannot find this paper anywhere and everyone I talk to says its just a name brand that is hard to find.
buhdieboy (author)  rmdc17 years ago
Wet/Dry Sheets Silicon Carbide paper backed sheets. at automotive store yes (use for discribed method of squaring) for harded seats only this step not for cast seats nessesarily also lawnmovers have harded seats too ok? valves still require valve lapping after this seat squaring idea"