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Old 11-10-2007, 03:43 PM   #1
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Default white exhaust valves. are they ok

ive done a bit of searching for this but cant really get a definate answer.

i bought a head to replace mine and everything looked ok except the exhaust valves are white.

i just want to know if this means they are bad or is it ok.

Click the image to open in full size.

thanks guys
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Old 11-10-2007, 03:54 PM   #2
 
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Default Re: white exhaust valves. are they ok (92ehatch)

Weird i have never seen white e valves. Dont know if good or bad.
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Old 11-10-2007, 03:57 PM   #3
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I have some of that on the exhaust valves of my number three cylinder. It was black, but after some scrubbing with Purple Power it's kind of white. All I know is that was the cylinder I was burning coolant in. Don't know if that helps. Click the image to open in full size.
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Old 11-10-2007, 04:16 PM   #4
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Default Re: (Hardedge)

valve guides are leaking a little bit, and thats just burt carbon thats got really hot.
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Old 11-10-2007, 05:45 PM   #5
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Default Re: (Frickr)

Quote:
Originally Posted by Frickr
valve guides are leaking a little bit, and thats just burt carbon thats got really hot.
thanks Click the image to open in full size.
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Old 11-10-2007, 06:16 PM   #6
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Default Re: (92ehatch)

As long as the valve seat area is good and the rest of the valve isn't too pitted, your good.
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Old 11-10-2007, 06:21 PM   #7
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well if your putting new valves in, i would regrind the valve seats, and lash them for each valve. maybe go with a 3 angle valve job. the just check the guides. if your going to do it, might as well do it right the first time.
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Old 11-11-2007, 03:44 AM   #8
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Default Re: (Frickr)

well i bought a new head because my old one had bent valves.

the seats in the old one were bad, the guides were bad

this one has a tiny amount of rust.

its 64 bucks to recut the valves and seats at carquest and they will check the valves for bends free.
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Old 11-11-2007, 07:57 AM   #9
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Default Re: white exhaust valves. are they ok (92ehatch)

The exhaust valves should be a whitish tan color, that indicates good heat transfer and average combustion. Your engine looks like it was chewing on some oil by the look of the stem. Face of the valve white as well?

The valve seat looks questionable, how long has that valve sat out?

What you've shown is nothing to worry about.
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Old 11-11-2007, 08:56 AM   #10
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Default Re: white exhaust valves. are they ok (92ehatch)

it does look like it was using a lil bit of oil
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Old 11-11-2007, 09:02 AM   #11
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it looks like its from over heating
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Old 11-11-2007, 12:58 PM   #12
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Default Re: white exhaust valves. are they ok (slowcivic2k)

Quote:
Originally Posted by slowcivic2k
The exhaust valves should be a whitish tan color, that indicates good heat transfer and average combustion. Your engine looks like it was chewing on some oil by the look of the stem. Face of the valve white as well?

The valve seat looks questionable, how long has that valve sat out?

What you've shown is nothing to worry about.
face of the valve is also white. i dunno how long the head has been sitting as i bought it off ebay.

there was some rust on the seats and such so id say its been sitting a while.

i plan to have the seats and valves cut in and already have new valve stem seals.

there is some play in the guides, dunno if that is any worry or not.

head supposedly has 65k on it
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Old 11-11-2007, 03:43 PM   #13
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Default Re: white exhaust valves. are they ok (92ehatch)

Check the guide diameter and compare it to the stem, if they are not in spec, replace the guides or ream them to accept oversize valve stems, and replace the valves.

A split ball gauge can be used for the guide bore, and use a micrometer for the stem.
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Old 11-11-2007, 03:50 PM   #14
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Like was said tanish white is a good thing. It doesn't look that bad. Have the valve job done and put the head on.

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Old 11-11-2007, 03:55 PM   #15
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Default Re: (1992Si)

That doesn't look like burnt carbon to me. I always thought white was coolant but I could be very wrong. let me do some research
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Old 11-11-2007, 04:07 PM   #16
 
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Default Re: white exhaust valves. are they ok (Ze Buceta)

those deposits on the valve are from burning oil.i would definetly have the guides and seals done.i would have a valve job done.
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Old 11-11-2007, 04:47 PM   #17
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Default Re: white exhaust valves. are they ok (slowcivic2k)



Quote:
Originally Posted by slowcivic2k
Check the guide diameter and compare it to the stem, if they are not in spec, replace the guides or ream them to accept oversize valve stems, and replace the valves.

A split ball gauge can be used for the guide bore, and use a micrometer for the stem.
i dont have a split ball gauge, is there supposed to be any play in the guides ? i dont mind replacing them, but no sense in buying something i dont have too
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Old 11-11-2007, 04:52 PM   #18
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Default Re: white exhaust valves. are they ok (92ehatch)

Quote:
Originally Posted by 92ehatch

i dont have a split ball gauge, is there supposed to be any play in the guides ? i dont mind replacing them, but no sense in buying something i dont have too
The machine shop will tell you what it needs. That's what your paying them for.

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Old 11-11-2007, 05:01 PM   #19
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Default Re: white exhaust valves. are they ok (92ehatch)

Quote:
Originally Posted by 92ehatch

i dont have a split ball gauge, is there supposed to be any play in the guides ? i dont mind replacing them, but no sense in buying something i dont have too
Yes there is supposed to be clearance, or else you'd be metal on metal since metals expand when they get hot.
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Old 11-12-2007, 04:44 PM   #20
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Default Re: white exhaust valves. are they ok (slowcivic2k)

well found a guy at work (honda dealership) who is willing to let me borrow a split ball guage and micrometer so ill check the clearances. i believe they are ok. i still plan on getting the valves cut.

thanks for the help
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Old 11-12-2007, 05:30 PM   #21
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Default

If it is caused by overheating it might be a good idea to get a Precision Straight Edge to check if it is warped.
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Old 11-13-2007, 01:58 AM   #22
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Quote:
Originally Posted by Joecivic94
If it is caused by overheating it might be a good idea to get a Precision Straight Edge to check if it is warped.
already done that.

the head isnt warped, however there is a raised area around one of the stud holes.

im going to try and knock that raised area down with some sand paper, if that doesnt work ill get it machined
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