Re: [Cal_Boats] Hurth gears and other boat toys(Tom)

Hello Tom, Sorry to hear you're not feeling well but glad to hear you are still with us. Regarding Hurth (I have one, seems OK now). What do you recommend as a replacement for aCal 36 with a Westerbeke 27? Mike Robinson Holiday Cal 36 #4 Pt. Richmond, CA On 12/19/07, Tom Vandiver <bs… [at] yahoo.com> wrote: > > > >

Of course Mike, you'll have to check things out, but I replaced my failed ZF/Hurth, with a Techno drive Twin Disc transmission TMC40P. This was installed on the Universal / Westerbeke MD-20. To re-gain alignment (different shaft offsets, the drop center of the TMC40 is 68mm and the HBW50 is 62mm) I had to move (shim) the engine at a slightly different height and angle. I did this by installing ironwood pieces under the existing rubber dampened motor mounts... I could have gone without the shims, possibly, as there was adjustment room on the mounts, but the engine was near the top, and tended to wobble a bit too much for my taste. With the shims, it now sits lower on the mounts, and appears much more stable. This is a most excellent replacement and has been done many times, according to Joe DeMers, who sold me the new unit, with a new dampener plate (required to match-up). There where some very small adjustments made for me to accommodate the different position shift lever in my engine bay (grinding back part of the engine bed). I'm very happy that this worked out, as the new tranny has a better friction method in my opinion (cone) and is rated to match my potential HP output under any circumstances.. The Hurth appeared to be suitable "most of the time" just barely... until it burned up. Pleasure Rating: Intermittent operation with very large variation in engine speed. Maximum power capacity is intended only for personal use, planing hull pleasure craft where full engine throttle operation will be less than 10% of the total time with balance of time at 80% of full throttle engine RPM or less. Annual operating hours up to 500. (For TMC transmissions 300 hours/year). TMC40 Horse Power Input Rating Pleasure RPM Intermediate RPM Continuous RPM Ratio 3000 3600 2800 3000 1800 2300 1.45 34.9 34.9 34.9 34.9 24.1 30.8 2.00 34.9 34.9 28.2 32.2 17.4 22.8 2.60 29.5 34.9 22.8 25.5 12.1 16.1 ZF/Hurth Rating: <http://www.simplicity-marine.com/ZF/Definitions/Definitions.htm> PLEASURE DUTY CLASSIFICATION MODEL RATIOS MAXIMUM INPUT POWER "A" "B" 2600 rpm 2800 rpm 3200 rpm HP/rpm ft.lb kW/rpm Nm HP kW HP kW HP kW ZF 5 M (HBW 50) 2.050 1.860 23 17 25 18 28 21 0.0089 46 0.0066 63 2.720 2.150 16 12 18 13 20 15 0.0063 33 0.0047 45 Max engine speed: 5000 rpm. Max Input Power 20 kW. . CONTINUOUS DUTY CLASSIFICATION MODEL RATIOS MAXIMUM INPUT POWER "A" "B" 1800 rpm 2300 rpm 2600 rpm HP/rpm ft.lb kW/rpm Nm HP kW HP kW HP kW ZF 5 M (HBW 50) 2,050 1,860 13 10 16 12 18 14 0.0071 37 0.0053 51 2,720 2,150 9 7 11 9 13 10 0.0050 26 0.0037 35 Max engine speed: 5000 rpm. Max Input Power 15 kW. From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of Michael Robinson Sent: Thursday, December 20, 2007 3:07 PM To: Ca… [at] yahoogroups.com Subject: Re: [Cal_Boats] Hurth gears and other boat toys(Tom) Hello Tom, Sorry to hear you're not feeling well but glad to hear you are still with us. Regarding Hurth (I have one, seems OK now). What do you recommend as a replacement for aCal 36 with a Westerbeke 27? Mike Robinson Holiday Cal 36 #4 Pt. Richmond, CA On 12/19/07, Tom Vandiver <bs… [at] yahoo.com <mailto:bs… [at] yahoo.com> > wrote:

Somehow, I 've never associated a "pleasure rating" with engines. Maybe it's just me. Cheers Charlie From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of ti… [at] ch2m.com Sent: Thursday, December 20, 2007 9:22 PM To: Ca… [at] yahoogroups.com Subject: RE: [Cal_Boats] Hurth gears and other boat toys (Mike) Of course Mike, you'll have to check things out, but I replaced my failed ZF/Hurth, with a Techno drive Twin Disc transmission TMC40P. This was installed on the Universal / Westerbeke MD-20. To re-gain alignment (different shaft offsets, the drop center of the TMC40 is 68mm and the HBW50 is 62mm) I had to move (shim) the engine at a slightly different height and angle. I did this by installing ironwood pieces under the existing rubber dampened motor mounts... I could have gone without the shims, possibly, as there was adjustment room on the mounts, but the engine was near the top, and tended to wobble a bit too much for my taste. With the shims, it now sits lower on the mounts, and appears much more stable. This is a most excellent replacement and has been done many times, according to Joe DeMers, who sold me the new unit, with a new dampener plate (required to match-up). There where some very small adjustments made for me to accommodate the different position shift lever in my engine bay (grinding back part of the engine bed). I'm very happy that this worked out, as the new tranny has a better friction method in my opinion (cone) and is rated to match my potential HP output under any circumstances.. The Hurth appeared to be suitable "most of the time" just barely... until it burned up. Pleasure Rating: Intermittent operation with very large variation in engine speed. Maximum power capacity is intended only for personal use, planing hull pleasure craft where full engine throttle operation will be less than 10% of the total time with balance of time at 80% of full throttle engine RPM or less. Annual operating hours up to 500. (For TMC transmissions 300 hours/year). TMC40 Horse Power Input Rating Pleasure RPM Intermediate RPM Continuous RPM Ratio 3000 3600 2800 3000 1800 2300 1.45 34.9 34.9 34.9 34.9 24.1 30.8 2.00 34.9 34.9 28.2 32.2 17.4 22.8 2.60 29.5 34.9 22.8 25.5 12.1 16.1 ZF/Hurth Rating: <http://www.simplicity-marine.com/ZF/Definitions/Definitions.htm> PLEASURE DUTY CLASSIFICATION MODEL RATIOS MAXIMUM INPUT POWER "A" "B" 2600 rpm 2800 rpm 3200 rpm HP/rpm ft.lb kW/rpm Nm HP kW HP kW HP kW ZF 5 M (HBW 50) 2.050 1.860 23 17 25 18 28 21 0.0089 46 0.0066 63 2.720 2.150 16 12 18 13 20 15 0.0063 33 0.0047 45 Max engine speed: 5000 rpm. Max Input Power 20 kW. . CONTINUOUS DUTY CLASSIFICATION MODEL RATIOS MAXIMUM INPUT POWER "A" "B" 1800 rpm 2300 rpm 2600 rpm HP/rpm ft.lb kW/rpm Nm HP kW HP kW HP kW ZF 5 M (HBW 50) 2,050 1,860 13 10 16 12 18 14 0.0071 37 0.0053 51 2,720 2,150 9 7 11 9 13 10 0.0050 26 0.0037 35 Max engine speed: 5000 rpm. Max Input Power 15 kW. From: Ca… [at] yahoogroups.com [mailto:Ca… [at] yahoogroups.com] On Behalf Of Michael Robinson Sent: Thursday, December 20, 2007 3:07 PM To: Ca… [at] yahoogroups.com Subject: Re: [Cal_Boats] Hurth gears and other boat toys(Tom) Hello Tom, Sorry to hear you're not feeling well but glad to hear you are still with us. Regarding Hurth (I have one, seems OK now). What do you recommend as a replacement for aCal 36 with a Westerbeke 27? Mike Robinson Holiday Cal 36 #4 Pt. Richmond, CA On 12/19/07, Tom Vandiver <bs… [at] yahoo.com <mailto:bs… [at] yahoo.com> > wrote: