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Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 15914
Experience:  Degree in Marine Technology. Gas and diesel marine mechanic.
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What is an acceptable compression 1998 mercury EFI 200hp,

Customer Question

what is an acceptable compression for a 1998 mercury EFI 200hp, and what is unacceptable.
Submitted: 2 years ago.
Category: Boat
Expert:  Jason replied 2 years ago.
Hello my name is ***** ***** am I speaking with.
Mercury does not give technical specification for this in their manuals. (because there are to many variables)
However on this engine, with a high quality gauge, it would have had 125 to 130 psi when brand new.
As the engine wears and tears that number will go down. The lower limit at sea level is 85 to 90 psi. Once they get below that they will still run, but they will struggle to old a good idle as well as make full power.
I do want to make sure you are happy with my service before you go. If you had a further question on the issue by all means feel free to ask. If not, Just in case you do not understand the way the website works (and some folks do not). You do have to put forth a positive rating in order for it to credit me for helping you. When ratings are not done, the website simply keeps your deposit and they will not credit me. The ratings box is located at the top of the screen. To rate, you must select the start and also confirm it. Please let me know if you run into any problems or errors when trying to do it. If you do have a problem, or if you can not see the ratings box which is at the top of the screen. Please reply back "I rate Jason's service _______" and fill in the blank.
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Thank you
Expert:  Jason replied 2 years ago.
Hello, I noticed no rating has been done yet so I'm just checking in to see if you had any further questions on the issue. If there was anything else feel free to ask.

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