Transparent valve cover - GIF

Transparent valve cover.

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Previously:

<div style="display:inline-block; white-space:normal;"><span style="display:inline-block; text-align:center; vertical-align:top; width:150px; margin:0 15px 20px 0;"><img src="https://homemadetools-images.s3.amazonaws.com/hmt/1619418300_flat_head_side_valve_engine_thumb.jpg" style="width:150px; height:100px; object-fit:cover;"><br><span style="display:inline-block; height:60px; overflow:hidden;">Flat head side valve model engine</span></span><span style="display:inline-block; text-align:center; vertical-align:top; width:150px; margin:0 15px 20px 0;"><img src="https://homemadetools-images.s3.amazonaws.com/hmt/1652284760_transparent_valve_cover_thumb.jpg" style="width:150px; height:100px; object-fit:cover;"><br><span style="display:inline-block; height:60px; overflow:hidden;">See-through valve covers</span></span><span style="display:inline-block; text-align:center; vertical-align:top; width:150px; margin:0 15px 20px 0;"><img src="https://homemadetools-images.s3.amazonaws.com/hmt/1607887038_valve_facing_machine_thumb.jpg" style="width:150px; height:100px; object-fit:cover;"><br><span style="display:inline-block; height:60px; overflow:hidden;">Valve facing machine</span></span></div>

Is the mechanic trying to diagnose a problem or is this just something he thought would be fun to show?

Quote:

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Originally Posted by Karl_H

Is the mechanic trying to diagnose a problem or is this just something he thought would be fun to show?

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Common practice on some engines is to check for oiling of every lifter. This one is not oiling one of the lifters on the #4 cylinder Had he not checked it would cause premature engine failure. I used to have a pair of valve covers with the top cut out of them for most small and big block V8 engines 6-and 4-cylinder inline as well. When doing complete long block rebuilds just leave the distributor out of most engines of the day power the oil pumps with a drill motor and adaptor to pre oil and pressurize the system check that everything was oiling as it should and not over oiling any of the rockers. I didn't do a lot of engines maybe 10 to 30 a year but when they left my shop my customers had confidence in them.