Berger Heating
Recruit
- Joined
- Jun 8, 2015
- Messages
- 4
Hello all,
New to your forum, I have been reading a few pages related to this topic, but havnt been able to fine anyone with my exact situation.
I picked up a 1988 crestliner aluminum with a cobra omc 3.0.
From what I Understood, the previous owner had the engine rebuilt and then installed an hour meter, which now reads roughly 300 hours.
After a few runs in the boat we developed a "sputtering sound" which increased with rpm, so naturally I assumed and exhaust leak, I dove right into the repair first
removing the manifold and riser, there was a small leak there, but under inspection of the head gasket, I noticed that the the two center cyl were blown out and this was the cause of my "sputtering"
So I removed the head, cleaned both surfaces thoroughly, took a straight edge to the head and block, they seemed pretty flawless (( but perhaps someone could tell me the spec for it )) installed my new gasket, torqued head with seloc pattern in three stages 30, 60, and ending on 90. started motor and its seems to run well,
took it out this past weekend gently working it in for the first bit, got up to around 3000 rpm and the gasket let go in the exact same spot again, both centre cyl leaking on the exhaust side.
So IM wondering, is there a problem with the procedure I used? or is there an issue with timing or something else I may be overlooking? I consider myself to be mechanically inclined, but this is my first OMC rebuild.
I was also wondering if these motors are prone to this failure, it seems like the two middle cyl would get hot due to double exhaust port on the manifold causing it to burn out.
any tips would be greatly appreciated.
thanks,
Al
New to your forum, I have been reading a few pages related to this topic, but havnt been able to fine anyone with my exact situation.
I picked up a 1988 crestliner aluminum with a cobra omc 3.0.
From what I Understood, the previous owner had the engine rebuilt and then installed an hour meter, which now reads roughly 300 hours.
After a few runs in the boat we developed a "sputtering sound" which increased with rpm, so naturally I assumed and exhaust leak, I dove right into the repair first
removing the manifold and riser, there was a small leak there, but under inspection of the head gasket, I noticed that the the two center cyl were blown out and this was the cause of my "sputtering"
So I removed the head, cleaned both surfaces thoroughly, took a straight edge to the head and block, they seemed pretty flawless (( but perhaps someone could tell me the spec for it )) installed my new gasket, torqued head with seloc pattern in three stages 30, 60, and ending on 90. started motor and its seems to run well,
took it out this past weekend gently working it in for the first bit, got up to around 3000 rpm and the gasket let go in the exact same spot again, both centre cyl leaking on the exhaust side.
So IM wondering, is there a problem with the procedure I used? or is there an issue with timing or something else I may be overlooking? I consider myself to be mechanically inclined, but this is my first OMC rebuild.
I was also wondering if these motors are prone to this failure, it seems like the two middle cyl would get hot due to double exhaust port on the manifold causing it to burn out.
any tips would be greatly appreciated.
thanks,
Al
