steves86ta
Seaman
- Joined
- Jan 15, 2013
- Messages
- 56
Hi all,
Just had a pretty bad weekend. I have a 1980 Bahner mini day cruiser which has a "Mr" drive and a vortec 350 that I built. Its pushing approx 450 horse and about the same torque. The boat runs very well and I haven't had an issue until this weekend.
Got on the water Thursday and drove around a couple hours. I was heading back to the ramp and running pretty hard. WOT for about 15 miles and all of a sudden I heard/saw my tach bounce off the 7k peg. So I shut it down and notice its slipping above 2000 rpm.
Beach it and find out I spun a prop. Change the prop and all is good.
Friday comes around and I do the trip from needles ca to lake havasu city (havasu springs restaurant to be exact) and no issues. Grab lunch start heading back to needles (approx 50 miles each way). I get almost to the same spot that I spun a prop on Thursday and same thing happens. Tach bounces off the 7k mark. So I jump in check the prop and its fine. But this time its harder to move than Thursday was. I make it about 5 more miles up river and finally have to call for a tow.
The only thing I noticed was a loud screeching noise (similar to a drill press) and the smell of burnt rubber.
So far I have drained some drive oil and it is clean with no metal. The drive sounds good when spinning it over by hand. And after this I have finally narrowed it down to the coupler.
Now this coupler was brand new about 6 trips ago. And I just replaced both u joints and gimbal bearing. I also checked the alignment and it was dead on. I have also checked to make sure the motor doesn't move when running and it doesn't.
So I'm wondering if I am just pushing to much power through the stock style coupler? And maybe this is why it let loose. Or maybe it was a defective part? Another question is can I change over to the "triangle" style with my drive? Or is there a stronger alternative?
Thanks!
Steve
Just had a pretty bad weekend. I have a 1980 Bahner mini day cruiser which has a "Mr" drive and a vortec 350 that I built. Its pushing approx 450 horse and about the same torque. The boat runs very well and I haven't had an issue until this weekend.
Got on the water Thursday and drove around a couple hours. I was heading back to the ramp and running pretty hard. WOT for about 15 miles and all of a sudden I heard/saw my tach bounce off the 7k peg. So I shut it down and notice its slipping above 2000 rpm.
Beach it and find out I spun a prop. Change the prop and all is good.
Friday comes around and I do the trip from needles ca to lake havasu city (havasu springs restaurant to be exact) and no issues. Grab lunch start heading back to needles (approx 50 miles each way). I get almost to the same spot that I spun a prop on Thursday and same thing happens. Tach bounces off the 7k mark. So I jump in check the prop and its fine. But this time its harder to move than Thursday was. I make it about 5 more miles up river and finally have to call for a tow.
The only thing I noticed was a loud screeching noise (similar to a drill press) and the smell of burnt rubber.
So far I have drained some drive oil and it is clean with no metal. The drive sounds good when spinning it over by hand. And after this I have finally narrowed it down to the coupler.
Now this coupler was brand new about 6 trips ago. And I just replaced both u joints and gimbal bearing. I also checked the alignment and it was dead on. I have also checked to make sure the motor doesn't move when running and it doesn't.
So I'm wondering if I am just pushing to much power through the stock style coupler? And maybe this is why it let loose. Or maybe it was a defective part? Another question is can I change over to the "triangle" style with my drive? Or is there a stronger alternative?
Thanks!
Steve