bad valve seat?

[bloody_angel111]

hi guys, im just wondering how i can tell i have bad valve seats, i know i have 4 bent exhaust valves, but am wondering if the seats are bad. and if they are bad, how would i go about getting them fixed?

 

[stinktown1]

Hi there
The best thing to do is take the head to a good machine shop and have it repaired.
They will show you what is wrong with the head when they take the head apart.
Any time you change valves you should always make sure that they are seated into the head.

 

[bloody_angel111]

well i do plan on puttin the new valves in myself when i get them, and i dont know if the seats are bad yet, i guess i can tell once i get the new valves in if they dont seat right, i just didnt know how i would go about to get it fixed or how a machine shop fixes it, or how much it would cost

 

[Old Mitsu Tech]

If you have the classic bent valve syndrome, as it was suggested, I would go to a reputable machine shop and have them do the head work. I know we all like to take things into our own hands and such, but remember some things are best left to the professionals. He is checking a lot of things when he makes the repair. This calls for a lot of specialized expensive tools that will come into play here. One thing he will look at and probably replace are valve guides and possible replace some seats if they don't grind out right. Valve guides usually crack on the pocket side because of lateral stress that they are subjected to when the valve strikes the piston.

He is checking stem height, making sure the seats are all ground properly and the valves are fitting in the center of the face and not on the edge of the face.

Find a good machinist, tell him what you need and let him do his job as he sees fit.

As a professional technician, I do just that. I am the diagnostician, and the final fit guy. That means I find out what is wrong, figure out what to do, and once I send the head off to the "machinist" I put it all back together and make that engine look as if it has never been touched. Always strive to be a "stealth mechanic" If someone looks at your work and can't see that you did anything, you are doing it right.


Hope this helps.

 

[bloody_angel111]

thanks for the advice mitsu tech. i did plan on doing the valves myself, but after that, it seems maybe i should just take it to a machine shop, now i just gotta find one around here. i have 4 bent exhaust valves, so if i buy the valves, how much would it cost to get the rest of what you said, done, like new guides if i need them, new seats, and installing the 4 valves, how much would that cost, do you know?

 

[Old Mitsu Tech]

That all depends on who is doing it and how severe the damage is. Regional location surely plays a part in it also as it's probably cheaper here in the Mid West than it would be in say Los Angeles.

Take it to a good machinist and request an estimate of repairs before they start. That will be your best way to go. You can always say no once you get your estimate. That way it would only cost you the tear down time on the head.

Good Luck

 

[bloody_angel111]

well i have the head off the car already, and was gonna try taking the bad valves out, and bring him the new ones, with the head, and hope all he needs to do is install the valves, and not have to get new guides and fix the seats, but i doubt it