Another Valve Job Question 91 300SE

I had valve guides and seals replaced on my '91 300SE at 90,000 miles. Now, 30,000 later, it is using oil again (about a quart per 1,000 miles). My new mechanic (I've moved to a different state) tells me
that he thinks that the valve guides and seals need replacement, and that 5 of the spark plugs had oil on them. He suspects that the first mechanic may have charged me for valve guides but only replaced the seals.
I suggested that the next time I bring it in, that we replace the seals and see if that works. He said that he didn't think that would work, but he would be willing to try unless the valves have just too much play in them. If that is the case, he would proceed with the valve guide job. He also said that he normally does not replace seals without doing the guides too.
Does it make sense to try just seals?
Is there a standard for valve-to-valve guide clearance? Is it measured or just an acquired "feel"?
Thanks,
Jim W.
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Soerta, maybe. Somestimes it works. It worked for you for 30K miles, no ?

Both.
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On Tue, 22 Jul 2003 13:41:11 GMT, snipped-for-privacy@vrx.news (Richard J. Sexton (At work)) wrote:
Thanks, Richard.

Not really. It used almost no oil for about 15,000, then started using again - not gradually, but as if someone had turned on a switch. It did get worse over time, but for the most part, it started all at once.
I take it that you concur that the first mechanic didn't replace the guides?

Figures. I think I can trust this guy, but then again I thought I could trust the first guys too.
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Jim
Have you seen these (I'm not pugging them), just for interest.
http://www.cylinderheadshop.co.uk/K-line.html
I'm going to have the head done on my 110 engined 123. All the reports from friends who have used them on classic cars are very positive. They seem to offer superior performance to the original equipment. The 'rifling' effect on the insides seems to help with oil retention, but not allowing it to pass down into the cylinders.
I'm getting hold of a spare 110 head, and I'll have these fitted, then swap the head.
I guess they're available in the USA. Maybe worth asking your local engine re-conditioner about, to see if he has an opinion.
Cheers... Rob.

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