Jay Curtis
Seaman Apprentice
- Joined
- Mar 7, 2011
- Messages
- 34
i have a 1980 celebrity 19' openbow 305 chevy 228hp
i am trying to figure out if my motor coupling is slipping and then locking up again or slipping slightly i would think that if it slipped real bad a couple of times it would just let go and continue to slip or if i have a bunch of props that the bushings are slipping in
last year with a high 5 13.75 x 19 pitch 4600 rpm 39 mph
took the prop in this spring to get repaired and tried some old props i had a 3 blade aluminum 14.5 x 21 way to big and seamed to spin on the bushing
suddered real bad at about 2500 RPM and lost speed
stuck a 17 pitch prop on it and it seamed to work fine but rpm was way to high and speed was down
then tried a 3 blade aluminum 13.5 x 21 and could only get 3500 rpm at 39 mph and real slow acceleration
bought a used 14.5 x 19 trying to get closer to the Hi 5 and it suddered real bad at about 2500 RPM
took to the prop shop and they were able to get the bushing to slip, took it to another shop they couldn't make it slip
finally got the high 5 prop back 5000 rpm 33 mph slower than normal acceleration but motor revs up faster no shuddering prop shop says that prop bushing does not spin
found a list of ways to check motor bushing stand on prop in forward and motor turns
put the 13.5 x 21 back on and got 4000 RPM at 39 MPH earlier it was 3500 RPM 38-39 MPH
ran around the lake for 45 minutes then tried to see if trimming up the OD would pick the speed up much
got the RPM up to 4200 maybe a little speed increase then started to slip like i had trimmed up to far
reduced throttle and lowered drive hit the throttle and just slipped so i thought ok now i finally spun the motor coupling
after about 30 seconds it locked back up and i spent another 1/2 hour at high speed and hard accelerating from dead stop never slipped again and 4000 RPM at 39 mph i did notice that the boat accelerates better than it did the day i could only get 3500 RPM with this prop .
i did mark the hub and prop on this one and it moved so how do i determine if i have a bad motor coupling or 4 bad prop bushings? and can these things slip and then lock up the second shop checked the high 5 an the work from the first shop looks fine so there has to be some slippage some where to increase the rpm and loose speed right?
thanks for the help
i am trying to figure out if my motor coupling is slipping and then locking up again or slipping slightly i would think that if it slipped real bad a couple of times it would just let go and continue to slip or if i have a bunch of props that the bushings are slipping in
last year with a high 5 13.75 x 19 pitch 4600 rpm 39 mph
took the prop in this spring to get repaired and tried some old props i had a 3 blade aluminum 14.5 x 21 way to big and seamed to spin on the bushing
suddered real bad at about 2500 RPM and lost speed
stuck a 17 pitch prop on it and it seamed to work fine but rpm was way to high and speed was down
then tried a 3 blade aluminum 13.5 x 21 and could only get 3500 rpm at 39 mph and real slow acceleration
bought a used 14.5 x 19 trying to get closer to the Hi 5 and it suddered real bad at about 2500 RPM
took to the prop shop and they were able to get the bushing to slip, took it to another shop they couldn't make it slip
finally got the high 5 prop back 5000 rpm 33 mph slower than normal acceleration but motor revs up faster no shuddering prop shop says that prop bushing does not spin
found a list of ways to check motor bushing stand on prop in forward and motor turns
put the 13.5 x 21 back on and got 4000 RPM at 39 MPH earlier it was 3500 RPM 38-39 MPH
ran around the lake for 45 minutes then tried to see if trimming up the OD would pick the speed up much
got the RPM up to 4200 maybe a little speed increase then started to slip like i had trimmed up to far
reduced throttle and lowered drive hit the throttle and just slipped so i thought ok now i finally spun the motor coupling
after about 30 seconds it locked back up and i spent another 1/2 hour at high speed and hard accelerating from dead stop never slipped again and 4000 RPM at 39 mph i did notice that the boat accelerates better than it did the day i could only get 3500 RPM with this prop .
i did mark the hub and prop on this one and it moved so how do i determine if i have a bad motor coupling or 4 bad prop bushings? and can these things slip and then lock up the second shop checked the high 5 an the work from the first shop looks fine so there has to be some slippage some where to increase the rpm and loose speed right?
thanks for the help
