I picked up both the cylinder heads from the shop degreased and resurfaced. It looks like 4 out of 6 of the exhaust valve guides have dropped considerably. One is chipped from the valve since it dropped so low, no visible damage to the valve itself, the valves don't look worn either, but they are getting checked for specs as we speak.

My dad put together a puller for the valve guides, they are coming out without a problem, I do have a question however.
I will replace the one that is chipped for sure, but as for the other ones that dropped, would there be any risks involved, other then them dropping back down after another 200,000km if I just push them back up, put on new seals and put the head back together?

From the design it appears as if the seal is supposed to hold the guide in place from dropping in addition to it being pressed into the head.

Any suggestions?

Oh, I also heard from a mechanic that you can test the valves for propper seal if you pour gas from the top and watch if it will hold for at least 2 minutes. If the valves hold it, then they seal correctly, anyone ever heard of this method? Is this what is referred to as a leak down test? It just occured to me.

TIA

xp

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1985 190E 2.3L - a constant project.