1996 Johnson 175 hp Ocean Runner (unknown hours)
Motor has developed a chinka-link rattle at about 3800-4000 RPM. The sound is like a large steel chain being dragged across a pile of chains.
Before my most recent trip, I changed out the fuel bulb and hoses up to the hose connector on the left side of the engine. I run high-octane fuel and Pennzoil Marine Premium TWC-3 oil using the VRO.
I have taken this motor on 6 trips this season for approximately 40-50 hours of saltwater fishing. Last Sunday after running out for about 45 minutes at 4000 rpm we headed back. Ran for about 20 minutes at 4000 rpm and began to hear a low drone sound. I noticed the change in engine droning right away but kept same speed. After 5 minutes, I started to hear the chinka-link noise and immediately dropped the throttle down to 1500 rpm. Noise ceased right away and engine sounded fine, no missing or sputters. Took it back up to 3000 rpm and it didnt sound or feel right. Went up to about 3800 rpm and the chinka-link sound returned. Limped home for an hour and a half at 2000 rpm and 7 knots. When I got into the harbor, I had to idle at the ramp and it seemd to be a rough idle. After pulling out of the water, I noticed dark oil seepage and streaks between the mid-section and lower along the cavitation plate. some oil was coming out the prop exhaust too. I didnt check if it was fuel mix or gear oil and just got her home. At home, I ran clean water and salt away through the engine. It peed just fine and sounded great at idle.
Friday will be my first chance to run compression tests and check for water in the lower.
Any advice or experience would be appreciated.
Motor has developed a chinka-link rattle at about 3800-4000 RPM. The sound is like a large steel chain being dragged across a pile of chains.
Before my most recent trip, I changed out the fuel bulb and hoses up to the hose connector on the left side of the engine. I run high-octane fuel and Pennzoil Marine Premium TWC-3 oil using the VRO.
I have taken this motor on 6 trips this season for approximately 40-50 hours of saltwater fishing. Last Sunday after running out for about 45 minutes at 4000 rpm we headed back. Ran for about 20 minutes at 4000 rpm and began to hear a low drone sound. I noticed the change in engine droning right away but kept same speed. After 5 minutes, I started to hear the chinka-link noise and immediately dropped the throttle down to 1500 rpm. Noise ceased right away and engine sounded fine, no missing or sputters. Took it back up to 3000 rpm and it didnt sound or feel right. Went up to about 3800 rpm and the chinka-link sound returned. Limped home for an hour and a half at 2000 rpm and 7 knots. When I got into the harbor, I had to idle at the ramp and it seemd to be a rough idle. After pulling out of the water, I noticed dark oil seepage and streaks between the mid-section and lower along the cavitation plate. some oil was coming out the prop exhaust too. I didnt check if it was fuel mix or gear oil and just got her home. At home, I ran clean water and salt away through the engine. It peed just fine and sounded great at idle.
Friday will be my first chance to run compression tests and check for water in the lower.
Any advice or experience would be appreciated.
