Join Date: Aug 2003
Location: Long Island, NY
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Re: How to do compression check?
You should ask your surveyor how he will evaluate the engine. When I had my boat surveyed (in 2006) he said he would check all fluids (engine oil, transmission oil, coolant), check all hoses (fuel and coolant), perform a visual evaluation, and then test it during the sea trial. The sea trial included running it at wide open throttle (WOT) for a minute to make sure it didn't overheat (it didn't) or smoke (it did - due to being overpropped), and make rated rpm (it didn't, again because of the prop). He also performed an emergency stop to test the engine mounts.
The glow plugs on my engine didn't work well (bad wiring) so the engine was hard to start. It had 3600 hours at the time of the survey. I wasn't concerned because the engine ran fine, and I only put about 50 hours a year on it. It now has about 3900 hours and has worked very well.
Here is the surveyor's report on the engine:
The engine started easily after pre-heat and ran without smoke. The volume of cooling
water was good. There was no oily residue on the water.
Due to the tachometer problems it was not possible to see if the engine ran up to the
manufacturer's specification of 3200 RPM. At wide open throttle the boat speed,
measured by GPS, was 6.7 kts, below the theoretical hull speed of 7.3 kts.
Engine temperature at WOT was 180°F. The temperature differential between the raw
water and the exhaust was 20º at cruise and 30° at WOT. No hot cylinders were noted.
The alternator was charging at 14.35V.
The engine ran without significant vibration. The emergency stop test did not disturb the
Day To Remember, 1986 O'day 35 For Sale
Deep Blue C, 2002 C&C 110 For Sail
Mt. Sinai, NY
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