My Poggy
Member
- Sep 12, 2020
- 44
- Boat Info
- 36 Sedan Bridge (2007)
Raymarine E120, radar, bow/stern thruster
- Engines
- Mercruiser 8.1
Hello,
I have a 36 Sedan Bridge with two Mercruiser 8.1 engines. One of the cylinders gave a very low compression reading (50 psi). Is this reading more about a broken ring or a valve that doesn't close? I am optimistic that a broken piston ring will not give a very low reading and hope that it is a valve that remains open. If it is a valve, what ballpark figure am I expected to pay? I plan to find a mechanic who can do leak test to confirm. But looking ahead, if it is a broken piston ring, what can I do short of removing the engine from the boat, which is a horrendous scenario? Is it possible to disable that faulty cylinder by turning off fuel supply to it? Or can I still drive the boat with less power but without going into limp mode. Thank you for any advise.
I have a 36 Sedan Bridge with two Mercruiser 8.1 engines. One of the cylinders gave a very low compression reading (50 psi). Is this reading more about a broken ring or a valve that doesn't close? I am optimistic that a broken piston ring will not give a very low reading and hope that it is a valve that remains open. If it is a valve, what ballpark figure am I expected to pay? I plan to find a mechanic who can do leak test to confirm. But looking ahead, if it is a broken piston ring, what can I do short of removing the engine from the boat, which is a horrendous scenario? Is it possible to disable that faulty cylinder by turning off fuel supply to it? Or can I still drive the boat with less power but without going into limp mode. Thank you for any advise.