How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Yachtwork Your Own Question
Yachtwork
Yachtwork, Marine Engineer
Category: Boat
Satisfied Customers: 1048
Experience:  MEC3 and RYA Yachtmaster Ocean
10951514
Type Your Boat Question Here...
Yachtwork is online now
A new question is answered every 9 seconds

What is the normal cylinder compression mercury verado 300

Customer Question

what is the normal cylinder compression for a mercury verado 300
Submitted: 1 year ago.
Category: Boat
Expert:  Yachtwork replied 1 year ago.

Normal compression for a good cylinder, tested with all spark plugs removed should be about 175psi.

Sometimes results will vary depending on the testing method and gauge so test all cylinders and see if they are the same. That is more important than a single cylinder result. In other words if all cylinders are reading 160 then that should be fine because we would think the issue is in the testing equipment, BUT if you have a 155 and the rest are at 180 then we have a cylinder issue.

Scott

Related Boat Questions