[C320-list] Ahoy owners with Perkins engines

[Kirk McCullough]

Warren

Funny you should mention the crab trap issue. This happened to me last
month. Over the with the snorkel and mask to unwind it. You are right the
engine stops right away and I can just imagine the jarring action as it jams
up. I was idling only when I caught the trap line, and everything seems to
work fine.

Kirk

#124

-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Warren Updike
Sent: 27 October 2009 15:13
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Ahoy owners with Perkins engines

>From what I understand, a flex coupling has two main benefits: 1) provides
a
level of vibration isolation; 2) acts as a shock absorber in the even of a
fouled or struck prop.

Typical engine room soundproofing will reduce the noise that is transmitted
through the air. However, a fair percent of engine noise is not transmitted
through the air; but, directly through the hull as vibration via the
transmission, engine mounts, and shaft. A flex coupling dampens some of this
vibration preventing it from reaching the hull. The primary function is to
protect the drive train.

Not much chance of striking a prop on the ground with a sailboat; but, here
in the Chesapeake it's not at all rare to capture a crab trap line in the
prop. I've had several such incidents, and a very common event is for the
line to wrap on the prop/shaft and haul in the float to wedge between the
hull and prop. Nothing will stop your engine as fast. Imagine the stress on
the drive train. With a flex coupling, the shock is absorbed by the
coupling. The coupling might even part. Better to ruin a $300 coupling than
have a bent prop, shaft, and/or other damage.

Warren & Pattie Updike
Catalina 320, #62, "Warr De Mar"
Middle River, Chesapeake Bay


-----Original Message-----
From: Kirk McCullough [mailto:kirk.mccullough at telus.net] 
Sent: Monday, October 26, 2009 11:24 PM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Ahoy owners with Perkins engines

It's a good thing to keep in mind. I did the SS shaft at the same time and
also installed the Kiwi prop. The Kiwi puts a heck of a load on the gearbox
in reverse so I feel safe with ZF10.

Whats the benefit of the flex coupling?

Kirk

-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Warren Updike
Sent: 24 October 2009 13:26
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Ahoy owners with Perkins engines

Yes, in fact when I contacted Foley about rebuilding my Hurth 50, they
recommended I go to the ZF10/Hurth100. I think it is about 10mm longer than
the ZF5/H50; and, indicates that I should shorten the shaft which I decided
not to do. Instead, I had the HWB50 rebuilt at a shop near Annapolis for
about $750.

In the future should I find the need to deal with the transmission again, I
will definitely go with the upgrade, replace the shaft with SS, and add a
flex coupling. I figure that will cost about $700.

Warren & Pattie Updike
Catalina 320, #62, "Warr De Mar"
Middle River, Chesapeake Bay

-----Original Message-----
From: Kirk McCullough [mailto:kirk.mccullough at telus.net] 
Sent: Friday, October 23, 2009 3:55 PM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Ahoy owners with Perkins engines

Another option is to get the ZF 10 (hurth 100) which is designed to take the
29 hp the Perkins can deliver, in fact as I recall it's good up to 45 hp.
The ZF 5 or ZF 6, just like the Hurth 50 is really on the edge of the
specification for our engines. The ZF 10 a little longer but otherwise is a
direct replacement.

Kirk
#124

-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Warren Updike
Sent: 22 October 2009 09:27
To: c320-list at lists.catalina320.com
Subject: [C320-list] Ahoy owners with Perkins engines

Actually, this is about your Hurth transmission. FoleyEngines.com is an
authorized facility for Perkins and ZF/Hurth products.  This is not a
recommendation, just a heads up for owners that may not know about Foley.
Check this out:

http://archives.subscribermail.com/msg/9ca93553bbd5413abfd0e5ce4695fe78.htm

 

Warren & Pattie Updike

Catalina 320, #62, "Warr De Mar"

Middle River, Chesapeake Bay