The second gaug will show yu how much prssure has been Iost. One gauge wiIl tell you th pressure of th air compressing th cylinder. To perform a leak down test, you would pressurize the cylinder with compressed air. Parts ordered from this website may or may not be in dealer stock at the time of order. Having said tht, heres how t compression test n outboard engine. Since most of us do not live at sea level, the actual ideal. Assuming atmospheric pressure of 14.7 psi (pounds per square inch at sea level) then the pressure in the cylinder should reach 6 times 14.7 or about 88.2 psi. They are within a 10 span and all over 60psi, which is the low end of typical range. This compression ratio means that the outboard is designed to compress the fuel/air mixture at 6 times atmospheric pressure. Mastertech may make improvements to this site at any time. Re: 1990 Johnson 200 - 'normal' compression numbers Those numbers are just fine for a big OMC V6. Changes are periodically added to the information herein. A drastic change in the engine power can be noticed when the compression lowers in any cylinder. And a head gasket failure is a reason why the compression gets low in the cylinders. The information, software, products, and services published on this web site may include inaccuracies or typographical errors. With too much heat, the engine block and cylinder tend to expand a lot-causing a head gasket failure. This information is disseminated in good faith, however MasterTech assumes NO LIABILITY whatsoever in regard to this service. The information provided on these pages is correct to the best of my knowledge, however the MasterTech makes no warranty, express or implied, regarding the use of, results of, or liability created from, application of this data. Please review our Warranty, Returns & Refunds policies before you place an order.
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