Originally Posted by Mikerodrig27
If he was having an issue with the reed valve, wouldn't he have a loss in compression? There would also be a lot of sneezing coming out of that cylinder.
What's an acceptable compression range for these engines?
125 comes to mind for normal, Someone else chime in if I'm not close on comp reading.
Intake reeds being broken usually won't show up in a comp check. Your only checking the sealing components of the cylinder itself.
I usually find broken reeds during a cylinder drop test with my CDS system. Low or no cylinder drop on cylinders with bad reeds. I always check them, especially on the 2.5 liter engines. They seem to break reeds very regularly. We swap to Boyesens and they usually have no issues from that point on. Fuel consumption does go up approx 2 gph with the Boyesens though.
I usually don't see reed issus on the larger disp Mercs, just throwing it out there because it's an easy check with some basic hand tools.