On 05/05/2022 2:59 PM, OK Don via Mercedes wrote:
Unless the cam is sitting in the oil, I don't think the engine design makes
much difference. There is a lot of pressure on the cam from the followers -
when the rust comes off it leaves pits with possible sharp edges. These
will spall the followers and the cam in time. How much time depends on how
deep the rust was. YMMV.
On Thu, May 5, 2022 at 2:54 PM Randy Bennell via Mercedes <
mercedes@okiebenz.com> wrote:
On 04/05/2022 6:24 PM, OK Don via Mercedes wrote:
Starting a car that has been sitting and having its engine being "OK" are
two different things. One of the big killers is rust on the cam from the
oil having drained off. The rust grinds the cam followers shedding metal
into the engine. Yes, it's running, but for how long before it
self-destructs?
Is this something more relevant to an engine like the Mercedes with an
over head cam.
My thought is that it wouldn't be as likely to pose a problem with
something like an old inline Chevy 6 cylinder engine. The cam and the
lifters are such that one would think any rust on the cam would wash
into the oilpan pretty quickly and a fresh oil change after running for
a few minutes ought to rid the engine of most of anything that was
rubbed off of the cam.
Randy
Interesting. Something I have never considered. I guess, if you are
correct, in my example of the Chevy engine, it might be wise to pull
the side covers and some lifters to see what the cam looks like.
Randy
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