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Old 23-02-2015, 03:28   #31
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Re: Too many flexible bits.

Hmm, that image did not work, did it?


Trying again...
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Old 23-02-2015, 03:50   #32
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Re: Too many flexible bits.

Quote:
Originally Posted by GILow View Post
Hey RC, I just realised what you had written here. This is very interesting to me, that makes TWO hard mounting points at least (taking a cutless at the PSS end as a hard mount in this context.) Is your engine hard mounted or soft mounted?

Can you elaborate on your setup? HP, gearbox, shaft diameter etc.

Matt

P.S. If I remember correctly, you have soft mounts on the engine, right? (You were pricing some newies recently?) If so, I wonder how that all works, does the upper cutless allow enough movement to accomodate the movement of the engine?
Hi Matt, I was just reading through this thread and spotted your questions.

My set up looks the same as the picture you posted. I've got a 38hp with solid coupling with 1 inch shaft. I only out the engine back in a few months ago with what were meant to be second hand mounts I purchased off eBay but 'hardly used'. As soon as they arrived I suspected they had been used more than the seller said. I think they were way too soft, possibly softer than they were designed to be.

My engineer had to make me a new cut less bearing and when he saw I had a pss seal he suggested I should have a second cuteness in the boot behind the pss seal. The reason why is because the old gland packing acted not only as a seal, but gave the shaft some secondary support. But now with a pss seal, which I had put in, he thought it would flex way too much. So I said sure, go ahead and fit one in behind the pss seal.

On my recent trip I observed it doesn't get hot at all. But my engine alignment which was perfect was after about 8 hours of running down the river to my mooring out of alignment again and I believe it's because if those crappy old engine mounts. That's why I was asking on another thread about replacing them with after markets such as the ISO mounts.

I think adding the extra cities bearing initially solved my large vibration noise but it soon stuffed up because my mounts need replacing.

Ted
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Old 23-02-2015, 04:42   #33
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Re: Too many flexible bits.

Ted, I followed all that except for the last sentence. Was that an autocorrect problem or did you mean to write "cities bearing"? If so, can you explain what a cities bearing is?

More importantly, how did you go with Fenquin, were they able to quote you vetus engine mounts at a good price?

Matt


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Old 23-02-2015, 04:47   #34
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Re: Too many flexible bits.

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Originally Posted by Dolphinblue-BOB View Post
Matt, i do not see the picture. But as you have described it, it should be ok. I suggest a new prop. It is good idea to check the old one, and have it as a spare onboard. You never know when you can damage the new one.

I am increasingly interested in a new prop and I am sorely tempted by the four blade Kiwi prop. I have obtained a quote and the price seemed fair, but I cannot find any reviews of the four blade model. There were some poor reviews of the Kiwi prop early on, but recent reviews seem more positive as they improved the design I suppose. Then yes, the current prop would make a good spare and a spare prop strikes me as a good thing to have before we go around Oz.

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Old 23-02-2015, 04:52   #35
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Re: Too many flexible bits.

Quote:
Originally Posted by GILow View Post
Ted, I followed all that except for the last sentence. Was that an autocorrect problem or did you mean to write "cities bearing"? If so, can you explain what a cities bearing is?

More importantly, how did you go with Fenquin, were they able to quote you vetus engine mounts at a good price?

Matt


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Yes, it was an auto correct. "Extra. Cutlass bearing" was intended.

I haven't rang them yet, no. Been a bit busy, but I will certainly be doing so.
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Old 23-02-2015, 04:57   #36
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Re: Too many flexible bits.

Quote:
Originally Posted by GILow View Post
Someone made a remark about the whole thing being a bit of a dark art. Too right I say!
Matt
No doubt huh???

Good thread Matt... Lots of good guys helping too... One more apple on the pile... Even though you don't think you have room for my carrier plate idea... If you went down this route, I think you would need a bit of flex between the tranny coupler and the carrier bearing to take transverse loads off the tranny tail... Jeezo... intuition seems to dictate we either need to go rigid Catholic school stiffness, or hippie free spirit drivetrain constraints.... As we all know, problems arise with both!

Following along!

PS, I'll try and find a pic of my drivetrain...
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Old 23-02-2015, 04:59   #37
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Re: Too many flexible bits.

I am not sure if Kiwiprop has got a 4blade version. My knowledge of KIWIprop is limited to theory only, but it seems to be well engineered. However, i was talking about 4 blade fixed prop, as a solution to reduce the vibrations.
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Old 23-02-2015, 05:04   #38
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Re: Too many flexible bits.

Quote:
Originally Posted by HappyMdRSailor View Post
... Jeezo... intuition seems to dictate we either need to go rigid Catholic school stiffness, or hippie free spirit drivetrain constraints.... As we all know, problems arise with both...

Having had, as you so eloquently put it, the rigid Catholic school system of hard engine mounts, I am never going back! I don't care what I have to do to make this setup work, but I will never, ever go back to that hard mounted horror again. The boat is so much more relaxing under power now. Five minutes with old system and I was a nervous wreck.

But yeah, I can see there could be traps with the hippie free spirit version if it wobbles its way out of the boat.

Sigh.




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Old 23-02-2015, 05:09   #39
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Re: Too many flexible bits.

Quote:
Originally Posted by Dolphinblue-BOB View Post
I am not sure if Kiwiprop has got a 4blade version. My knowledge of KIWIprop is limited to theory only, but it seems to be well engineered. However, i was talking about 4 blade fixed prop, as a solution to reduce the vibrations.

The four blade kiwi is a relatively new addition to their stable, I think to handle engines over about 60 hp which are relatively rare I suppose. I've read about four blade props being smoother and I should keep that in mind if I cannot afford the Kiwi or for some other reason elect to stay with a fixed blade prop. As it is I suspect the mild tremor is simply a balance problem rather than a prop configuration, but the cost of having the prop balanced is over ten percent of the cost of a new kiwi prop, and so you can see the temptation here...


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Old 23-02-2015, 05:16   #40
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Re: Too many flexible bits.

Quote:
Originally Posted by Rustic Charm View Post
Yes, it was an auto correct. "Extra. Cutlass bearing" was intended. .

Ah, yes, in retrospect I should have realised that.

Ok, so the cutless (or is it cutlass, I'm not sure) was chewed out by the extra movement from the engine? That's a worry for sure, but I suppose there was a constant downwards force if the mounts had collapsed under load? Either way, it implies to me that such a setup would be more vulnerable to alignment problems?


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Old 23-02-2015, 05:39   #41
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Re: Too many flexible bits.

Quote:
Originally Posted by GILow View Post
Having had, as you so eloquently put it, the rigid Catholic school system of hard engine mounts, I am never going back! I don't care what I have to do to make this setup work, but I will never, ever go back to that hard mounted horror again. The boat is so much more relaxing under power now. Five minutes with old system and I was a nervous wreck.

But yeah, I can see there could be traps with the hippie free spirit version if it wobbles its way out of the boat.

Sigh.

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Oh I'm with ya on that score for sure!

Here's two pics showing tranny flange to shaft seal...

Plate with the aquadrive takes some of the thrust... Whole system, (aquadrive/carrier assy) is soft mounted to the plate... food for thought...
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Old 25-02-2015, 05:25   #42
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Re: Too many flexible bits.

To add a little humor to the thread... As you can see in the previous drivetrain pics... The PO thought it was a hilarious idea to mount the $2500 house charger parallel, and approximately 8" away from the driveshaft on an engine room bulkhead...

I inherited his BBQ'd bits... What a Knee Slapper!!!

Back to our regularly scheduled topic ...
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Old 25-02-2015, 10:35   #43
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Re: Too many flexible bits.

Replace the no-drip shaft seal with a standard shaft log.
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Old 26-02-2015, 20:15   #44
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Too many flexible bits.

That's an aqua drive set up. Meant to reduce eccentric movement. There is a limit though.

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