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#1
posted to rec.boats.cruising
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Transmission slipping
Does anyone have experience with an anti-slip additive for marine
transmissions? We have a Hurth HBW-150 R2 transmission that is slipping, and we may have to alter our cruising plans as a result.. I really don't want to continue without a workable transmission as I've seen too many situations where sail alone was inadvisable, especially in some of the Bahama cuts.. We changed the fluid, checked the linkage, and have been babying it since first noticed.. It doesn't have an oil cooler, and I'm aware that might help, but what we have is what we have.. Anyone with suggestions? Diana |
#2
posted to rec.boats.cruising
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Transmission slipping
"Dr. Di" wrote in message ... Does anyone have experience with an anti-slip additive for marine transmissions? We have a Hurth HBW-150 R2 transmission that is slipping, and we may have to alter our cruising plans as a result.. I really don't want to continue without a workable transmission as I've seen too many situations where sail alone was inadvisable, especially in some of the Bahama cuts.. We changed the fluid, checked the linkage, and have been babying it since first noticed.. It doesn't have an oil cooler, and I'm aware that might help, but what we have is what we have.. Anyone with suggestions? Diana Yes, I understand that a handful of beach sand does wonders. -- Gregory Hall |
#3
posted to rec.boats.cruising
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Transmission slipping
"Dr. Di" wrote in message ... Does anyone have experience with an anti-slip additive for marine transmissions? We have a Hurth HBW-150 R2 transmission that is slipping, and we may have to alter our cruising plans as a result.. I really don't want to continue without a workable transmission as I've seen too many situations where sail alone was inadvisable, especially in some of the Bahama cuts.. We changed the fluid, checked the linkage, and have been babying it since first noticed.. It doesn't have an oil cooler, and I'm aware that might help, but what we have is what we have.. Anyone with suggestions? Diana I had a somewhat smaller Hurth (28 hp) that slipped and this caused a delay in engagement although it did finally pick up the drive but it was a worry especially in docking situations and I could never be quite sure when revving up the engine whether the extra revs were in fact being transmitted to the prop or whether the extra torque was causing more slippage.. Spoke to a Hurth engineer who said that the clutch plates has probably come to the end of their life and needed changing. Maybe the previous owner of the boat had not slowed the engine before going from ahead to astern. Anyway, the bad news was that the cost of the new plates plus labour meant that it was more economical to replace the whole box at a cost of about £900. Considring this, plus the hassle of getting the engine out from under the cockpit to remove the box I decided to put back a new engine and gearbox while Ii was at it as this would add value to my yacht as well as ensuring reliability. These boxes are small and precision made and should engage with a hard 'click' and no slippage so I cannot offer much hope for an easy solution.. |
#4
posted to rec.boats.cruising
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Transmission slipping
Dr. Di wrote:
Does anyone have experience with an anti-slip additive for marine transmissions? We have a Hurth HBW-150 R2 transmission that is slipping, and we may have to alter our cruising plans as a result.. I really don't want to continue without a workable transmission as I've seen too many situations where sail alone was inadvisable, especially in some of the Bahama cuts.. We changed the fluid, checked the linkage, and have been babying it since first noticed.. It doesn't have an oil cooler, and I'm aware that might help, but what we have is what we have.. Anyone with suggestions? You cannot buy a mechanic in a can.... Cheers Marty |
#5
posted to rec.boats.cruising
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Transmission slipping
On 2008-03-17 15:20:30 -0400, Dr. Di said:
Does anyone have experience with an anti-slip additive for marine transmissions? We changed the fluid, checked the linkage, and have been babying it since first noticed.. It doesn't have an oil cooler, and I'm aware that might help, but what we have is what we have.. Anyone with suggestions? Diana I do believe you should pull the tranny, break it down, and replace the worn parts. When a wet clutch stops working, there are often other worn parts. I'd pay particular attention to the spring(s), which do get weak over time. (Note: this is from motorcycle maintenance; I've not had to touch a boat transmission except to change the oil.) -- Jere Lull Tanzer 28 #4 out of Tolchester, MD Xan's pages: http://web.mac.com/jerelull/iWeb/Xan/ Our BVI trips & tips: http://homepage.mac.com/jerelull/BVI/ |
#6
posted to rec.boats.cruising
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Transmission slipping
On Mon, 17 Mar 2008 15:20:30 -0400, Dr. Di
wrote: Does anyone have experience with an anti-slip additive for marine transmissions? We have a Hurth HBW-150 R2 transmission that is slipping, and we may have to alter our cruising plans as a result.. I really don't want to continue without a workable transmission as I've seen too many situations where sail alone was inadvisable, especially in some of the Bahama cuts.. We changed the fluid, checked the linkage, and have been babying it since first noticed.. It doesn't have an oil cooler, and I'm aware that might help, but what we have is what we have.. Anyone with suggestions? Diana I guess the first question is how do you know that it is slipping? But if you are positive that the transmission is slipping then the only solution is to rebuild it. A Hurth is a very simple transmission - two clutch packs and a second shaft and gear set to reverse the output rotation. If it is slipping then the clutch plates are worn and nothing you can do is going to make any real difference. An oil cooler won't make any difference at this stage but if you do rebuild then adding a cooler might make the rebuilt box last longer next time. Foley Marine is a good source of parts and information regarding Hurth boxes although there are plenty more on the net. http://www.foleyengines.com/Home.aspx Bruce-in-Bangkok (correct email address for reply) |
#7
posted to rec.boats.cruising
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Transmission slipping
I didn't measure the differences in shaft speed, mainly because I have
no way to do it.. But the transmission overheats, and the boat speed through the water decreases without any change in engine RPM's.. Thanks for your input Bruce, as well as everyone else who attempted to help.. I guess it's time to consider pulling and rebuilding the transmission.. Are you really in Bangkok? I think Thailand is a great place to visit, with very friendly people... At least I found it so... Diana On Tue, 18 Mar 2008 09:36:53 +0700, Bruce in Bangkok wrote: On Mon, 17 Mar 2008 15:20:30 -0400, Dr. Di wrote: Does anyone have experience with an anti-slip additive for marine transmissions? We have a Hurth HBW-150 R2 transmission that is slipping, and we may have to alter our cruising plans as a result.. I really don't want to continue without a workable transmission as I've seen too many situations where sail alone was inadvisable, especially in some of the Bahama cuts.. We changed the fluid, checked the linkage, and have been babying it since first noticed.. It doesn't have an oil cooler, and I'm aware that might help, but what we have is what we have.. Anyone with suggestions? Diana I guess the first question is how do you know that it is slipping? But if you are positive that the transmission is slipping then the only solution is to rebuild it. A Hurth is a very simple transmission - two clutch packs and a second shaft and gear set to reverse the output rotation. If it is slipping then the clutch plates are worn and nothing you can do is going to make any real difference. An oil cooler won't make any difference at this stage but if you do rebuild then adding a cooler might make the rebuilt box last longer next time. Foley Marine is a good source of parts and information regarding Hurth boxes although there are plenty more on the net. http://www.foleyengines.com/Home.aspx Bruce-in-Bangkok (correct email address for reply) |
#8
posted to rec.boats.cruising
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Transmission slipping
On Wed, 19 Mar 2008 12:07:00 -0400, Dr. Di
wrote: I didn't measure the differences in shaft speed, mainly because I have no way to do it.. But the transmission overheats, and the boat speed through the water decreases without any change in engine RPM's.. /snip/ These days, non-contact or optical tachometers are cheap - and popular items at hobby shops. Look at this one, for example. $28. Stick a piece of tape on the shafdt and have the tach look at it. http://h1070530.hobbyshopnow.com/products/description.asp?prod=HAN156 Brian Whatcott Altus OK |
#9
posted to rec.boats.cruising
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Transmission slipping
On Mar 19, 2:59 pm, "Roger Long" wrote:
"Brian Whatcott" wrote These days, non-contact or optical tachometers are cheap http://h1070530.hobbyshopnow.com/products/description.asp?prod=HAN156 Thanks for the good link to what I was suggesting to someone else for verifying their tach. ... That would be me, I think. Very cool at that price. I'm not sure how I'd get it to work on my saildrive though. -- Tom. |
#10
posted to rec.boats.cruising
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Transmission slipping
On Wed, 19 Mar 2008 12:07:00 -0400, Dr. Di
wrote: I didn't measure the differences in shaft speed, mainly because I have no way to do it.. But the transmission overheats, and the boat speed through the water decreases without any change in engine RPM's.. Thanks for your input Bruce, as well as everyone else who attempted to help.. I guess it's time to consider pulling and rebuilding the transmission.. Are you really in Bangkok? I think Thailand is a great place to visit, with very friendly people... At least I found it so... Diana All the Hurths I've seen got pretty hot. hot enough that, while it didn't burn your hand, you didn;t want to keep your hand on it very long. I am assuming that you have checked the oil. Yes I am in Thailand, I live here permanently. We spend about half our time in Bangkok and half in Phuket where we keep a 40' sloop. Bruce-in-Bangkok (correct email address for reply) |
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