1980Coronado
Senior Chief Petty Officer
- Joined
- Oct 8, 2010
- Messages
- 699
I hope someone can confirm what I'm being told...or at least give some rules of thumb. All joking aside...my shaft is too short :facepalm:
I have a 1980 Coronado that had a bent prop shaft when I purchased it last July. I purchased a replacement last fall after removing the original shaft and providing the length and diameter to the manufacturer. My original shaft was 1" diameter x 52" long. It was the standard single taper shaft, with the 5" coupling being a press fit on the transmission end, and a taper for the prop on the other. The replacement shaft is a new double taper design. It has a taper on the coupling end as well with a woodruff key and a nut to attach it to the shaft. The new design allows you to remove the coupling nut and use an externally threaded nut to pop the coupling off the taper. It is a big time saver when removing the shaft.
The new shaft was about .1 inches shorter than my original shaft. When I installed it last fall and then installed the prop, I didn't have enough exposed shaft between the prop and strut to get a prop puller in place without loosening the coupler bolts from the transmission and sliding the shaft back. There was less than an 1/8" gap between the strut and the prop. They agreed to replace the shaft and their customer service has been excellent...but I'm now having to do the work again. This time I gave them the dimension from the face of transmission coupler to the trailing edge of the strut, which on my boat is 48". Based on this number they are now telling me the replacement shaft should be a 52.6" long. The first one they sent was 51.9" although they thought they sent a 52.1" shaft. In my opinion based on the 51.9" that I installed, I only needed about 3/8" more shaft to get the puller in. I guess I'm concerned that this new shaft is going to be longer than it needs to be. They're increasing the length from 51.9" to 52.6"..that's a difference of .7"...almost 3/4"....I believe that I will now have about .8" between the strut and the prop.
ok...all of that to ask this question...is that too much gap between the prop and strut? Is there some standard distance for this gap? Does anyone know, based on the 48" dimension from the transmission coupling face to the back of the strut, how long the 1" diameter shaft should be?
I have a 1980 Coronado that had a bent prop shaft when I purchased it last July. I purchased a replacement last fall after removing the original shaft and providing the length and diameter to the manufacturer. My original shaft was 1" diameter x 52" long. It was the standard single taper shaft, with the 5" coupling being a press fit on the transmission end, and a taper for the prop on the other. The replacement shaft is a new double taper design. It has a taper on the coupling end as well with a woodruff key and a nut to attach it to the shaft. The new design allows you to remove the coupling nut and use an externally threaded nut to pop the coupling off the taper. It is a big time saver when removing the shaft.
The new shaft was about .1 inches shorter than my original shaft. When I installed it last fall and then installed the prop, I didn't have enough exposed shaft between the prop and strut to get a prop puller in place without loosening the coupler bolts from the transmission and sliding the shaft back. There was less than an 1/8" gap between the strut and the prop. They agreed to replace the shaft and their customer service has been excellent...but I'm now having to do the work again. This time I gave them the dimension from the face of transmission coupler to the trailing edge of the strut, which on my boat is 48". Based on this number they are now telling me the replacement shaft should be a 52.6" long. The first one they sent was 51.9" although they thought they sent a 52.1" shaft. In my opinion based on the 51.9" that I installed, I only needed about 3/8" more shaft to get the puller in. I guess I'm concerned that this new shaft is going to be longer than it needs to be. They're increasing the length from 51.9" to 52.6"..that's a difference of .7"...almost 3/4"....I believe that I will now have about .8" between the strut and the prop.
ok...all of that to ask this question...is that too much gap between the prop and strut? Is there some standard distance for this gap? Does anyone know, based on the 48" dimension from the transmission coupling face to the back of the strut, how long the 1" diameter shaft should be?
