Here's why I sought your advice. The boat (a 1975 32' Trojan Sedan) has been laid up dry for approximately 3+ years, and shows signs of attention to detail before being put to sleep. (The freshwater tanks were still filled to the brim with anti-freeze, and the like). I instructed the evaluating mechanic to not try to crank the engines, but rather to pull & inspect all plugs and 'squirt' the chambers with Marvel. My idea was to help any 'stuck' rings free themselves during the first cycles of cranking. We did that exercise on Thursday and plan to 'crank' on this coming Monday.
That's the background.
Now, during first cranks on Monday for the cylinder pressure tests, will the readings be skewed by virtue of the Marvel oil we squirted in the cylinders on Thursday? If so, in what direction will the reading tend to go. If, they are 'false', what could then be done to get truer readings?
The boat is on hard stand and we do not intend to try to start the motors...in any case, the carbs are probably plugged w/varnish.
Late Start
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