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blackstone results... how much does it tell me...

S

slauder

Regular Contributor
I want to make sure I'm not throwing away money when I do the heads this winter. It looks like bottom half is okay. Comments welcome.

PORT:
SCOTT: Universal averages show typical wear metals for oil from this type of Crusader marine engine after
about 56 hours run on the oil. Your oil was in use just seven hours, and we found all wear reading at or
below average levels and in the correct balance. As you said on the slip, you can't ever get all the old oil out
when you change it, so there's always going to be some carryover from sample to sample. And that's fine.
Air and oil filtration are normal, and no fuel, moisture or anti-freeze was present. This oil can stay in use
longer. Nice engine.

STARTBOARD:
SCOTT: Normally, two identical engines of the same vintage on the same craft, sharing the same oil and
fuel and with the same hand on the throttles, should wear identically if both have normal mechanical parts
inside. That is just what we found for these two Crusader engines. Both are wearing well, and other than a
trace of fuel here, no significant contaminants were present. No soot found. This oil can be run longer too.
Leave the oil on both sides in place for a total of 15-20 hours, then check back. The next time you send in
samples, we'll start establishing wear trends.
 
Looks to me like they're telling you that you have two good running engines, what is making you think you need to have the top end reworked ? I'm a big fan of "if it ain't broke , don't fix it".. I'm sending my samples out in a few days, I would hope to get back a report as good as yours..Your engines have about 250 hours more than mine,but from your tests and what you say they both seem to be running the same..is there a specific problem you're looking to solve ?...Lee
 
Last edited:
looks like you are on course...may want to do a leak down test to assess the shape of the top end if you have any doubts.
 
My doubts are based on hours, running rich, and having trouble tuning the carbs for smooth vacuum at low idle. Also I only had 7 hours on the oil (blackstone said they would calibrate the results).

I bet its the new technician that's to blame (myself). Do you think I can get away with a leakdown even though I'm fogged and loaded with pink?
 
Well there's no need to run the engines, you'll be turning it over to get your pistons at TDC by hand and pull the valve covers so you know that both valves are closed for the cylinder you are testing, You will lose a some pink, but I don't see why you can't do it. Look forward to seeing the results...Lee
 
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