I guess one of the most important tasks is setting up the transmission. Right or wrong this is how I tackled the job.
I first looked at the transmission tower and fitted all the bearing sets and shafts into position and temporarily tightened them down. The upper and lower shafts were checked and adjusted for parallel and the two thru bolts tightened to lock it all up. It was then fitted in position.
I then looked at the relationship between the motor and the lower shaft. Right from the start my hull sat on the workshop floor which I knew was dead level and I was able to use this as a flat reference for the motor and shaft. The flex coupling flanges were fixed onto the motor and lower shaft and straight edges were clamped across them as in the photos. A spirit level was used to get the motor and shaft into vertical alignment. The adjustment was made with the studs on the transmission support. As it was, the 190 mm height to the motor shaft center was spot on and very little adjustment was required. A check was the made with the straight edges to make sure the flanges were parallel in the side view.
I then went back and checked everything. At this point I was happy with progress so I cut the connecting shaft to length and installed the flex couplings. I was then able to jury rig the motor and give the lower shaft a run. All of this happened with the duct off the craft so it was now fitted back on and tightened down to its final position. The fan was then fitted and measurements were taken from the rear of the duct to make sure it was aligned. The two support wings were installed and again adjustments were made to get the fan centered. The drawings call for 635 between the shaft centers and with this dimension the fan was very close to central so the pulleys and belt were fitted. Again everything was double checked and tightened up.
The fan guard was fitted and the motor was fired up. For a first timer this was a scary experience and everything on the body was clenched tight !! After I started breathing again the motor was run for a few minutes then shut down. Everything was again checked and the fan was found to have a bit of play. A loose grub screw on the lower flex was the culprit so check it all again.The motor was then given a ten minute run until a burning smell had me shut it down. Turns out the lower shaft was touching the cutout in the lower duct and it got quite hot.
So it was pull it all apart and modify the duct and put it all back together. Damn. The motor and fan now have an hour of run time and things seem ok. I guess the main test will come when we hit the water and start to bounce things round a bit. This all sounds like a long job but if you take your time and look carefully at what you do it will all fall into place.
This whole process took a couple of days with things coming on and off again to gain access but I think it was good practice to get a feel for how it all works together. One more milestone and a bit closer to getting on the water.
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I guess one of the most important tasks is setting up the transmission. Right or wrong this is how I tackled the job.
I first looked at the transmission tower and fitted all the bearing sets and shafts into position and temporarily tightened them down. The upper and lower shafts were checked and adjusted for parallel and the two thru bolts tightened to lock it all up. It was then fitted in position.
I then looked at the relationship between the motor and the lower shaft. Right from the start my hull sat on the workshop floor which I knew was dead level and I was able to use this as a flat reference for the motor and shaft. The flex coupling flanges were fixed onto the motor and lower shaft and straight edges were clamped across them as in the photos. A spirit level was used to get the motor and shaft into vertical alignment. The adjustment was made with the studs on the transmission support. As it was, the 190 mm height to the motor shaft center was spot on and very little adjustment was required. A check was the made with the straight edges to make sure the flanges were parallel in the side view.
I then went back and checked everything. At this point I was happy with progress so I cut the connecting shaft to length and installed the flex couplings. I was then able to jury rig the motor and give the lower shaft a run. All of this happened with the duct off the craft so it was now fitted back on and tightened down to its final position. The fan was then fitted and measurements were taken from the rear of the duct to make sure it was aligned. The two support wings were installed and again adjustments were made to get the fan centered. The drawings call for 635 between the shaft centers and with this dimension the fan was very close to central so the pulleys and belt were fitted. Again everything was double checked and tightened up.
The fan guard was fitted and the motor was fired up. For a first timer this was a scary experience and everything on the body was clenched tight !! After I started breathing again the motor was run for a few minutes then shut down. Everything was again checked and the fan was found to have a bit of play. A loose grub screw on the lower flex was the culprit so check it all again.The motor was then given a ten minute run until a burning smell had me shut it down. Turns out the lower shaft was touching the cutout in the lower duct and it got quite hot.
So it was pull it all apart and modify the duct and put it all back together. Damn. The motor and fan now have an hour of run time and things seem ok. I guess the main test will come when we hit the water and start to bounce things round a bit. This all sounds like a long job but if you take your time and look carefully at what you do it will all fall into place.
This whole process took a couple of days with things coming on and off again to gain access but I think it was good practice to get a feel for how it all works together. One more milestone and a bit closer to getting on the water.
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Trevor Barrett