[C320-list] Engine Stalling In Reverse

[Kirk McCullough]

Shawn

Yep, that's definitely the complete fix. Looks like you got a good price on
the ZF-10 too. One other thing, when I installed the Kiwi the recently
rebuilt H-50 didn't last too long before it started slipping again. That's
when I did the ZF-6 and it didn't last 30 minutes. I believe the Kiwi is
really hard on the smaller gear box, so the ZF-10 is the ticket. This
doesn't seem to be an issue with the Yanmar engine gearbox combo.

I didn't need to change anything to install the ZF-10, and as I said I
didn't even change the shaft length. If I didn't have a stainless shaft
already at that point I would have shortened the shaft or ordered a new
stainless shaft one inch shorter. I believe the actual length difference was
7/8th of an inch. The strength of the stainless shaft means no issues even
though it is longer aft of the cutlass bearing. My mechanic suggested this
would not be a problem and it hasn't been.

I do like the feeling that the gearbox is solid and up to the task of full
power forward or reverse. The thing about the ZF-10 is that the clutch pack
is much stronger. 

I just can't say enough about the ZF agent in Seattle, they knew what the
solution was and did it all for the price of a new ZF-6. No questions
asked.WOW!

Good luck Shawn!


Kirk

-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Shawn Maloney
Sent: 19 May 2009 19:58
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Engine Stalling In Reverse


Kirk thanks for the reply.  I know you have the same
boat/gearbox/engine/kiwi prop as I do.  The shudder is more pronounced
because of the kiwi prop being at maximum pitch in reverse, although it did
shudder with the fixed prop as well.

I believe the idle gear may be loose (caused by the more pronounce shudder
of the kiwi??) and one explanation is that it angles out when it is under a
load, thus catching and causing the engine to stall out hard.  

Anyhow, I have ordered the ZF 10 M gearbox as you did because it is more
suitable to the specs of the Perkins.  Plus I have 1800 hours on it and it
provides the quickest fix.  J.D. at marine parts express is shipping one out
for $1019 US$.

This transmission is identical to the HBW 50 except that it is one inch
longer.  Did you have to modify anything else on installation?  I plan to
back out the shaft on inch.

-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Kirk
McCullough
Sent: Tuesday, May 19, 2009 10:03 PM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Engine Stalling In Reverse

Shawn

I have a 1994 with the Perkins. I have never had it stall as I go into
reverse, but the Perkins shakes and shudders on its mounts if the RPM are
too low. I suppose it might stall if I didn't quickly raise the RPM once in
reverse. I shift at 900-1000rpm then pick it up to 1200 or more to avoid the
shaking.

What kind of prop do you have, how many hours on the Perkins and Hurth? The
prop might be over-pitched in reverse.

You may need to have the Hurth rebuilt including the clutch pack, as you
found out I don't believe the damper plate does a whole lot to the stop
shuddering or stalling.

I actually changed mine to a Hurth 100, from the 50 they come with. It's
good for something like 55 hp, while the 50 is rated to 29, so it's at its
limit.

I would play with the RPM's to see if that helps and maybe get the Hurth
upgraded to a 100. Hurth is now actually owned by ZF and the new model is
the ZF-5 (Hurth 50), ZF-6 (an upgraded Hurth 50) or ZF-10 (Hurth 100)

Kirk
#124


-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Shawn Maloney
Sent: 14 May 2009 19:00
To: C320-List at Catalina320.com
Subject: [C320-list] Engine Stalling In Reverse


My 1993 Catalina has the Perkins engine and Hurth gearbox.  At the end of
the season last year it would instantly stall out when placed in reverse.
Over the winter I took the transmission out and opened it up.  Everything
looked find (not metal filings etc).  I replaced all the gaskets and it was
also suggested that the damper plate be replaced as this was usually the
cause of such a failure.  Well today,  I installed the overhauled tranny and
same result.  

 

Any other thoughts out there?

 

Shawn Hull #14