Mercury 225 Optimax

bogib · 03 February 2010, 07:20

One of our crew was using our ICE-SAR Stefnir, been cruising out on the bay with staff from communication center of maritime.
When on way back running the engine on 2500 to 3500 revs a big bang and port side engine stopped.
Continued on one engine to shore and boat trailered and when cowling taken off two large holes could be found on lowest cylinder on left side of V6, no trace of oil or petrol can be seen so not leeking from piston.
No alarm prior or after the incident.

Any one heard of similar incidents to Mercury 225 Optimax ?

Also we are wondering what may have happened, I am not a mechanic minded person.......

Bogi

aquatec · 03 February 2010, 11:35

Looking through the hole on the first image. I think I may be able to see the end of a broken con rod. Normally on Optis it is piston problems. So when you take the head off you may find piston damage on the same cylinder. Piston seizes, con rod breaks. Engine strip down required.

outboardtech · 03 February 2010, 14:04

look's like a big end has picked up , check the oil line feed going to that cylinder on the side of the block . had this on my personal engine and cause there is sooooooo much play on the crank there is ONLY WAY WAY OUT , Thru the block . OUCHHHHH i know the feeling

spartacus · 03 February 2010, 15:57

Quote:

Originally Posted by outboardtech

look's like a big end has picked up , check the oil line feed going to that cylinder on the side of the block . had this on my personal engine and cause there is sooooooo much play on the crank there is ONLY WAY WAY OUT , Thru the block . OUCHHHHH i know the feeling

What are the possible causes of oil starvation? Low oil level, incorrect viscosity, filter requiring change?

Robbie Diesel · 07 February 2010, 01:06

Bogi, What age was the engine? How many hours were on it?
I've read that the early years of the 200-225 optis were a bit trouble some. But 2003 onwards they are meant to be absoloutly Bullet proof.

bogib · 07 February 2010, 22:28

Quote:

Originally Posted by Robbie Diesel

Bogi, What age was the engine? How many hours were on it?
I've read that the early years of the 200-225 optis were a bit trouble some. But 2003 onwards they are meant to be absoloutly Bullet proof.

2007 MY, run well under 300 hours, saw the pics from the computer last Friday but can't remember the exact hours.

Waiting reply from the technical department in Belgium....

Bogi