[C38] Transmission

Mark Lewis mwlewis2025 at gmail.com
Mon May 14 18:27:27 EDT 2012


Thanks.

On Mon, May 14, 2012 at 3:23 PM, Steve Smolinske <
SSmolinske at rainierrubber.com> wrote:

> PYI is  located in the Seattle area they make a lot of  stuff
> http://www.pyiinc.com/  they are also a customer of mine.****
>
> ** **
>
> Steve****
>
> ** **
>
> *From:* listserve-bounces at catalina38.org [mailto:
> listserve-bounces at catalina38.org] *On Behalf Of *Mark Lewis
> *Sent:* Monday, May 14, 2012 3:20 PM
> *To:* tdtron at earthlink.net; Catalina 38 Listserve
> *Subject:* Re: [C38] Transmission****
>
> ** **
>
> Tom,****
>
>  ****
>
> What is PYI?  A trans company?  Where are they located, and how much money
> are we talking about?****
>
>  ****
>
> Mark****
>
>  ****
>
> PS.  My conversion to propane was very smooth.  Burners are working, just
> need new thermostat for the oven (the PO reported that mine didn't work
> under CNG either, so it has nothing to do with the conversion.  It didn't
> cost me anything to convert the range ( my propane supplier redrilled the
> orifice holes after capping them for free...I bought my shutoff solenoid,
> hose, pressure gauge and fittings through them for $142 which includes the
> hose and adapter for my Magma grill).  Still working on the fridge.****
>
> On Mon, May 14, 2012 at 12:46 PM, tdtron at earthlink.net <
> tdtron at earthlink.net> wrote:****
>
> Hello Larry,
>
> I'm no expert on transmissions but I may have some answers for you anyway.
>
> The "clunk" you refer to is usually caused by two things. The Hurth
> transmission uses a spiral input shaft with matching driven plate that
> allows the torque of the shaft to engage the drive plates like a nut on a
> bolt.  The rotation of the input shaft actually tightens up the drive
> plates when you shift gears.  This is how our transmissions shift so easily
> when a manual transmission car or truck will have a pressure plate and
> throwout bearing and clutch pedal which we don't have.  The reasons cars
> and trucks don't use spiral input shafts like our boats do is because you
> can't "slip the clutch" with our systems, our systems are either totally
> engaged or totally disengaged so they won't work on street vehicles.
>
> Another source of a clunk sound is the slack in the gears which increases
> from wear.  All of these components with slack combine to cause the clunk
> but with a good flex plate, this clunk sound should not be a problem.
>
> As regards to the "sweet spot" your technician was telling you about, it is
> the truth.  Every engine has resonant vibrations that are more pronounced
> at certain RPMs and less at others.  Having only three cylinders compounds
> the problem as does being diesel.  Idling is much more detrimental than
> motoring but low speed in either case increases gear chatter and wear.
> Sometimes speeding up or slowing down  will reduce but not eliminate the
> resonant vibrations.
>
> I replaced my Universal flywheel flex plate with the PYI unit and my engine
> was noticeably quieter and smoother at all speeds.  Another extremely
> important benefit of the PYI flex plate is that the engine will continue to
> drive the transmission even if the flex plate fails, unlike the steel
> springs Universal unit.  The PYI shaft coupler also offers this same
> benefit of positive engagement even with cushion failure.  I replace both
> my flex plate and shaft coupler and it was like I had re-powered to a
> smoother engine with more cylinders.  The results were nothing short of
> incredible.
>
> Universal flex plates have a history of fatigue failure of the cushion
> springs which can break like glass after they fatigue leaving your engine
> without thrust.  All of those pieces of the steel springs have no where to
> go but around and around inside the bell housing causing havoc to your
> aluminum bell housing, starter pinion, flywheel and ring gear.
>
> PYI claims their synthetic material isn't prone to fatigue but even if the
> cushion material ever did fail, you would still have thrust in both forward
> and reverse because the metal dogs are captive with the synthetic material
> acting as a cushion between the steel dogs but if the cushion material
> somehow magically disappeared, the dogs would still propel the boat.
>
> One problem I did have with the PYI flex plate was that when I tried to
> install it I couldn't get all of the flywheel bolts started without
> slightly filing the plate holes with a small rat tail file to help get the
> bolts started.  I don't know if the bolt pattern irregularity was from the
> flywheel,  the PYI flex plate, or both but the amount of material I had to
> remove was only a thousandths or two of an inch so there was no balance or
> concentric alignment problem.
>
> I know money doesn't grow on trees and PYI flex plates and shaft couplers
> aren't cheap but the PYI upgrades were some of the best improvements I ever
> made to my boat.  With the upgrades we could idle back to our slip with
> almost no vibration or noise  and sometimes I thought the engine had died
> because it had become so quiet and smooth.
>
> Tom Troncalli
>
>
>
>
> > [Original Message]
> > From: Larry Malmberg <Larrypi at roadrunner.com>
> > To: Catalina 38 Listserve <listserve at catalina38.org>
> > Date: 5/14/2012 12:28:52 PM
> > Subject: [C38] Transmission
> >
> > A very special Thank You to Jay Sorensen for coming through with a used
> > transmission.  Picked it up Sunday and am taking it to the shop today.  A
> > quick question though regarding transmissions.  Does every one with a
> Hurth
> > transmission get that "clunk" when you put it into gear?  Also, the
> > transmission guy tells me that there is a "sweet spot" for engine rpm
> when
> > idling, this so called sweet spot causes less wear on the damper and
> gears,
> > what's your experience with this?  My idle is set at about 900 rpm which
> > apparently is a bit too low?  I'm told the damper was worn from "engine
> > chatter" as well as a few of the gears, the engine chatter is apparently
> > from the idle being set too low.
> >
> >
> >
> >
> >
> > Best regards,
> >
> > Larry Malmberg
> >
> > 7231 Boulder Avenue Suite 507
> > Highland, CA 92346 PI 15211
> > Telephone  909-208-1847
> > FAX           909-991-7568
> >
> > E Mail  Larrypi at roadrunner.com
> >
> >
> >
> >
> > Life is short, Break the rules, Forgive quickly, Kiss slowly, Love truly,
> > Laugh uncontrollably, And never regret anything that made you smile..
> >
> > "The American Indians found out what happens when  you don't control
> > immigration"
> >
> >
> > "Life is not a journey to the grave with the intention of arriving safely
> in
> > a pretty and well preserved body, but rather to skid in broadside,
> > thoroughly used up, totally worn out, and loudly proclaiming; WOW-- What
> a
> > Ride!"
> >
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