2stroke1971
Petty Officer 1st Class
- Joined
- Nov 8, 2009
- Messages
- 210
Ive got an AQ125B. No idea on the hours,but the boat is 26 years old. I bought it last winter and did a valve job on the head, timing belt, water pump etc. Got it running really nice, compression on all cylinders was 140 to 150.
Its always had alot of blowby though. I finally pulled the hose out of the air cleaner because the plugs were fouling. No fouling since I did that though. Im not losing alot of oil, every 4 hours or so I top it up, barely half a quart. I change it more regularly because I know that gas fumes in the case can thin the oil over time.
Our normal trip includes about 500 pounds of humans.(Its a 19.5 foot bayliner cuddy by the way)
With this load, it has no problem getting up on plane and it will top out at around 34 mph. I almost never do that, I cruise at about 20-25. There have been times where we maxed out the load for sure, in fact it may have been a tad overloaded, having more people on than normal. In such cases, performance suffered dramatically. Of course thats normal, but this was really bad, like top speed was only 10 or 12. After quarter throttle, more throttle produced no results.
Im thinking thats a symptom consistent with the blowby, and Im sure a re-ring is needed. Ive been wrestling about what to do. Im not sure we will keep it past next season anyway but I feel kind of crappy running it this condition. I have the know how to do a rebuild, but not the resources. I have no way to lift the motor out, I store the boat out on the main road on the tow vehicle. (Difficult living in a row house and boating!) I cant afford to have someone else do it, it would cost more than 3 or 4 times what i paid for the boat! Today, I pulled a lower panel from the rear bench and crawled under there. I THINK I could drop the oil pan with the motor in situ, but I just dont think I could re ring it from the bottom. It would be very hard, and if a rod bearing was not seated right I would not see it even if I could reach the caps to torque them down.
Someone recommended I put straight 40 weight in the crankcase to reduce blowby. I know in my heart that the thing will purr all year long if I do nothing to it, and performance is nice with our normal load. We dont do any long distance or off shore stuff, its just a fishing boat to us.
Any comments one way or the other would be appreciated. How much of an idiot am I if whip it through another season?
Its always had alot of blowby though. I finally pulled the hose out of the air cleaner because the plugs were fouling. No fouling since I did that though. Im not losing alot of oil, every 4 hours or so I top it up, barely half a quart. I change it more regularly because I know that gas fumes in the case can thin the oil over time.
Our normal trip includes about 500 pounds of humans.(Its a 19.5 foot bayliner cuddy by the way)
With this load, it has no problem getting up on plane and it will top out at around 34 mph. I almost never do that, I cruise at about 20-25. There have been times where we maxed out the load for sure, in fact it may have been a tad overloaded, having more people on than normal. In such cases, performance suffered dramatically. Of course thats normal, but this was really bad, like top speed was only 10 or 12. After quarter throttle, more throttle produced no results.
Im thinking thats a symptom consistent with the blowby, and Im sure a re-ring is needed. Ive been wrestling about what to do. Im not sure we will keep it past next season anyway but I feel kind of crappy running it this condition. I have the know how to do a rebuild, but not the resources. I have no way to lift the motor out, I store the boat out on the main road on the tow vehicle. (Difficult living in a row house and boating!) I cant afford to have someone else do it, it would cost more than 3 or 4 times what i paid for the boat! Today, I pulled a lower panel from the rear bench and crawled under there. I THINK I could drop the oil pan with the motor in situ, but I just dont think I could re ring it from the bottom. It would be very hard, and if a rod bearing was not seated right I would not see it even if I could reach the caps to torque them down.
Someone recommended I put straight 40 weight in the crankcase to reduce blowby. I know in my heart that the thing will purr all year long if I do nothing to it, and performance is nice with our normal load. We dont do any long distance or off shore stuff, its just a fishing boat to us.
Any comments one way or the other would be appreciated. How much of an idiot am I if whip it through another season?
