Search results

Thanks for taking the time. I'll find out from Seahorse, and Emerson if necessary. By sheer coincidence, yesterday I managed to move the Engine and Genset Batteries which sit on top of the floor board with better access to the flange bearing. Here is a close up picture (took me long time to...

All the suggestions about loosening flange bearing, lifting the shaft to account for sag, scoring and strobe light to check shaft whip, etc. are now coming together in my mind. Also I need to re-check the Cardan Shaft as there may be some play. Thanks to everyone for all the suggestions ...

The academia I talked to does commercial work for boat/ship industry, so there is some credibility. On the other hand His approach is a theoretical one with actual measurement for calibration. It seems more like a design tool to prevent resonance, while mine is a built boat and resonance is...

Thanks for the info and suggestion. I have more to work with. If indeed 2.25" shaft is enough, I could get away with using the existing stern tube, by precision ream to enlarge the two ends (about 3.3 meters apart). But according to the 40X guideline recommended by shaft manufacturer, the...

Thanks for the suggestions which gave me ideas on what to look for. I need to do an assessment of the worst case, that I need to replace the shaft with a bigger one. Here in this part of the world, everyone says a yard would ream the existing fiberglass stern tube, which seem to me to be very...

Thanks for all the suggestions. The boat is in Hong Kong and going into a yard alone is extremely expensive. I now have some ideas what I can experiment with on my own, and what should be done in the yard, based on all the suggestions. I hope a vibration measurement/analysis would help, if...

Here are photos of Caden Shaft: https://drive.google.com/open?id=1scdA2ujXuNztCiz6TFkWDNBre6IFbZGo

As I replied to another comment, I see the point that for the longer DD542, the Whip Bearing and thrust bearing together may over constrain the shaft (as opposed to DD462 with a shorter shaft, the thrust bearing PROBABLY does not). Having said that if under no load, the shaft is straight: The...

Bill Kimley made a jig, a cylinder with two flanges on each end approximately the length of the Caden Shaft. The Caden Shaft was removed, one end of the jig was fastened to the prop shaft, and the other flange face was checked with feeler gauge for alignment with the transmission flange. I...

Thank you for your observations, I am getting a lesson here. DD462s which do not vibrate, use the same configuration as my DD542, only that DD542 is longer. I believe Seahorse use the Prop end Cutlass Bearing and the Whip Bearing to define the center line of the shaft. Once shaft is...

Yes, the Caden Shafts are correctly phased.

If I understand you correctly, I mentioned this concern as well that the Caden shaft being extended, can also deflect. But how to measure the deflection if any ? the surface of the Caden shaft is rough so I cannot use a depth gauge nor a laser.

My apology. A few pictures attached for now. Still digging up more detailed information in response to the first 3 replies to this thread.

Thank you for your comments. Indeed the Single Caden Shaft has one U-Joint at each end. However it has been checked and is unlikely the problem (trying to get Bill Kimley to fund a vibration analysis though). Single Caden Shaft is a standard configuration and practice for all Seahorse Diesel...

Thank you for the comments. Bill Kimley suspected "panting" of the hull. However Geroge Buehler disagreed that "there is nothing there to pant". I am trying to get Bill to fund a vibration test/analysis so we don't all have to guess. Seahrose yard has relocated and if memory serves me...

Thank you for making me aware of radial/axial thrust bearing. Based on the marking (photo attached) on my thrust bearing and the parts list of a DD462 (mine does not have the detail), my thrust bearing is an Emerson Morse SFA-RFB-112C-1 3/4". I cannot find this part number from Googling yet to...

Very interesting device which I am not aware of. As stated in another reply, I wonder if Thrust Bearing can support nearly HALF of the entire shaft from deflection. The shaft near the Thrust Bearing is the only exposed and short section (something like 1 or 2 ft, the rest is inaccessible in...

Thanks for the suggestion. Additional whip bearings were indeed thought of by Bill Kimley and myself. Presently there is one whip bearing sitting right in the middle of the Prop end Cutlass Bearing and the Transmission end Thrust Bearing. So far I deliberately left out why there is a Thrust...

Thanks for the information. I need such real reference cases as yours, otherwise everything is possible. So a bit more clarification requested: a. What is your engine power ? Mine is 178HP, and my gear box is 3:1. b. Do you have a thrust bearing ? If so do you consider thrust bearing as...

Thanks to the first 3 replies suggesting a vibration test/analysis by a professional, and some self help tricks. Some members of other boating forums also suggested a professional test, and apparently these days the results are quite definitive and not even expensive. After we got nowhere in...

I own a 55’ steel Diesel Duck (DD542) trawler yacht, which is a lengthened version of the very successful 48’ Diesel Duck (DD462) built by Seahorse Marine in Zhuhai, China (Zhuhai is a few hours from Hong Kong). The boat is now registered in Hong Kong since 2014. DD542 is beautifully built like...