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Exhaust valve deep in combustion chamber.
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arctic65
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PostPosted: Mon Jul 27, 2015 3:08 pm    Post subject: Exhaust valve deep in combustion chamber. Reply with quote

I didn't notice this before rebuild. Is this something to be concerned with?
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A Avina
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PostPosted: Mon Jul 27, 2015 3:50 pm    Post subject: Reply with quote

Post some pics. Could be that the seat is to low.[/b]
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PostPosted: Mon Jul 27, 2015 3:51 pm    Post subject: Reply with quote

It doesn't sound good.

Not is the time to fix it.
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PostPosted: Mon Jul 27, 2015 4:02 pm    Post subject: Reply with quote

Glenn wrote:
Not is the time to fix it.


Disagree do I, the time to fix is now Very Happy

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Arctic, is it noticeably different than the rest of the valves? How about a picture? http://www.thesamba.com/vw/forum/viewtopic.php?t=6
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arctic65
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PostPosted: Mon Jul 27, 2015 4:37 pm    Post subject: Reply with quote

Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.


Here is a couple photos. One showing a straight edge on the exhaust valve stems showing the gap above the intakes. Second shows how deep in combustion chamber.
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Boolean
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PostPosted: Mon Jul 27, 2015 5:01 pm    Post subject: Reply with quote

Just set rocker geometry to a happy compromise between intake and exhaust. Or use lashcaps on the intake.
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arctic65
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PostPosted: Wed Jul 29, 2015 6:13 am    Post subject: Reply with quote

Guys, thank you for the replies. I feel I need to have the heads repaired. Who should I send them to?
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PostPosted: Wed Jul 29, 2015 9:58 am    Post subject: Reply with quote

arctic65 wrote:
Guys, thank you for the replies. I feel I need to have the heads repaired. Who should I send them to?


All that needs to be done is to have the valve job cut deeper into the seat on the intakes. Any shop that rebuilds cylinder heads should be able to do that for you.
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mark tucker
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PostPosted: Wed Jul 29, 2015 12:17 pm    Post subject: Reply with quote

what size valves? if those are 35's you should be able to put 37's in and correct the situation. I would not purpusly sink the intakes.
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PostPosted: Wed Jul 29, 2015 12:28 pm    Post subject: Reply with quote

mark tucker wrote:
what size valves? if those are 35's you should be able to put 37's in and correct the situation. I would not purpusly sink the intakes.


Yeah, someone may have just stuck in bigger valves not knowing....best to take them out and inspect before doing anything.
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modok
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PostPosted: Wed Jul 29, 2015 5:04 pm    Post subject: Reply with quote

Don't sink the intakes.
The valve being deep won't hurt anything, and the aluminum that has been ground out won't be re-placed, so the new seat will have a lip around it, so it's not going to be perfect. You might just fix the stem height and leave the seat alone, unless the reason it's deep is the seat is made of butter..........in which case replace the seat.

What kind of rockers will you use?
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arctic65
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PostPosted: Fri Jul 31, 2015 7:16 am    Post subject: Reply with quote

These are L6 heads, 42mm intakes and 37.5 mm exhaust valves with multi angle valve job. I guess what I'm most concerned about is the 3 angle cut, loss of spring pressure on the exhaust valves and rocker geometry.
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modok
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PostPosted: Fri Jul 31, 2015 3:17 pm    Post subject: Reply with quote

Why didn't you setup the springs? Why didn't he setup the springs?
Somebody has to do it if you want that done.
If it has lash caps you can shorten the valve for sure, if not then maybe don't grind more than .015"
You could also make a shorter valve to fit the sunk seat, you could replace the seat.
A lot of things can be done but I get the feeling this is mostly lazy cheapness at work both with the problem and the solution.
how good does it need to be? just good enough to work? it may be fine then.
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morymob
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PostPosted: Sat Aug 01, 2015 4:31 am    Post subject: Reply with quote

If the valve fit to seat is correct adj rocker as mentioned, run it until seat fails at a later date which could be many miles, as usual no warranty offered at this time.
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