Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: aramsay on May 07, 2015, 19:47:50

Title: Using anti-scuff paste on valve stems ?
Post by: aramsay on May 07, 2015, 19:47:50

One for the engine builders....

What are folks' thoughts on using a graphite-based anti-scuff paste on valve-stems when re-assembling head ?
(as mentioned in one the workshop manual I am using....not an MB one)

My concern is what happens to the "paste" base in the heat of use ?

Is it likely to cook off, and gum up the tolerance gap ?

Title: Re: Using anti-scuff paste on valve stems ?
Post by: Shvegel on May 08, 2015, 03:01:02

I wouldn't do it for exactly the reason you mentioned.  So little oil actually runs down the stem when running that I would worry about it not washing out when the engine is started and simply drying out.  I use Mobil One being careful not to get any on the areas where the valve seals attach to the head.

Title: Re: Using anti-scuff paste on valve stems ?
Post by: Benz Dr. on May 10, 2015, 22:02:09

230SL valve stem seals have to go on dry or they will pop off. This means no oil on the stem or valve guide. I think our cars use some sort of low friction alloy valve guides that requires little or no lubrication.