Cruisers Forum

Thread Tools Search this Thread Rate Thread Display Modes
Old 30-11-2020, 19:26   #1
Registered User

Join Date: Dec 2018
Location: Cape May New Jersey
Boat: Morgan 40, Cruising Ketch
Posts: 2
Direct replacement for a Paragon SA1D?

Hi, I’m restoring my 1970 Morgan 40 Cruising Ketch. I plan to have the Perkins 4.108 hauled out and rebuilt. My drive train is a Paragon SA1D gear bolted to the 4.108 on the forward end and a Walters V-Drive on the other end. I’m afraid of the drive because it is old, and I don’t see any replacements available. I’d like to instal a new drive (gear) but am concerned that it would have to be virtually the same size (length at least) or it will change the angle of my propeller shaft. I assume it will have to have the same bolt pattern on the forward end to make up to the existing bell housing. Do any of you know of a marine gear that will bolt right in? I wouldn’t mind replacing the bell housing as well if that’s needed?
Carl Behrens is offline   Reply With Quote
Old 03-12-2020, 08:34   #2
Senior Cruiser
tkeithlu's Avatar

Cruisers Forum Supporter

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 2,816
Re: Direct replacement for a Paragon SA1D?

Here's a used one for sale.
Paragon / Westerbeke SA1D-521 Marine Transmissions | Model Number: SA1D-521 | Paragon / Westerbeke Rebuilt Transmissions

I think that if I were in your situation I would consider buying a spare and storing it against a failure.

Switching components, and adapting them to be compatible with other components, is always possible and probably one monster headache. The cost of adapting is likely to take your breath away as well. It is possible that you will run into a brick wall on finding a spare, but computer time searching may be better than time spent writing checks to machinists.

You might also consider having the SA1D overhauled while you're doing the engine. Old oil seals, for example, are a common form of failure, and they are relatively cheap to replace. In all likelihood, the gear train itself is just fine.

Good luuck with it.
Never let anything mechanical know that you are in a hurry.
tkeithlu is offline   Reply With Quote
Old 03-12-2020, 09:13   #3
Registered User
Mickeyrouse's Avatar

Join Date: Jun 2012
Location: Texas
Boat: Hinckley Bermuda 40
Posts: 315
Images: 4
Re: Direct replacement for a Paragon SA1D?

I would also suggest replacing the shifter links inside (there is probably a more technically correct term.) Their failure will prevent shifting into reverse. They tend to wear and break with age and use. Mine did so- after 30 years and 7,000+ hours. Even if a Paragon replacement part is no longer available, most likely the case, these links are only about 3” long originally stamped from about 3/16” flat steel with a couple holes bored. They are irregularly shaped, but with the old ones as patterns any semi-competent machinist could make replacements.

If the old Paragon can be re-built, it is one really robust gear.
Why wonít the money go as far as the boat will?
Mickeyrouse is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Direct Replacement for ZF 25 MA tranmission TrailerCruiser Engines and Propulsion Systems 8 21-01-2020 08:48
Paragon Transmission mestrezat Engines and Propulsion Systems 22 03-06-2017 16:53
Is Whale Mk V a direct replacement for a HendersonMK V? Roniszoro Monohull Sailboats 1 17-10-2015 12:51
Paragon Transmission replacement taiskwa Engines and Propulsion Systems 3 20-02-2015 18:04

Advertise Here

All times are GMT -7. The time now is 14:47.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.