Quote:
Originally Posted by Scott Douglas
I'd think you'd be able to 'see' a burned valve. Maybe all it really needed was a valve adjustment.
I know when my BMW 1600 burned a valve it had a pie section missing from one of the exhaust valves that was pretty obvious to the naked eye.
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Sometimes it's the case that damage is readily apparent but not always. I adjusted the valves and fired it up, still has a dead hole in #1. That would have been some luck. Every single valve in the engine was tight to the point of zero clearance or less, (partially opened valve), even without a lot of knowledge I am puzzled by how someone could think that they were adjusting the valves and did that(?)
I'll have an update very soon!
Postscript: It is
extremely important to use the right machine shop or guy with diesel heads...really any heads but diesel heads generally cannot be cut/shaved and there are specs for valve recession, (how deep the valve sits in the seat after being cut), that will affect CR. CR is critical on diesels, they are compression motors as opposed to spark motors. If the wrong monkey shaves a diesel head or cuts the valve seat too deep, the head is scrap metal.
This spec matters on spark engines but it's a lot less critical. Back in the day, when high performance engines ran 11:1 and sometimes higher CR, I would read articles in Hot Rod magazine about engine building with the greats, (Keith Black, Smokey Yunick, Grumpy Jenkins, etc.), and I always remember them CC-ing the combustion chambers of the heads to blueprint a race engine. I totally geek out on that stuff.
I take the time to make these posts hoping that the thread can be of use to other people doing similar repairs down the line as opposed to a thread fall of random pictures of old Mercedes cars. If someone wants to start that thread, I will spam the living daylights out of it with photos of Benzes. I have thousands!
