Association Forum - New motor mount location

Assn Members Area · Join

Home.

Association Forum

Ships Store

Cruising

Racing

Technical Tips

Photo Gallery - New

Boat Search - Updated

Manuals & Brochures

Swap Meet

Links

Officer Flag Line & Staff

Bylaws & Constitution

Members Area

Join the Association

Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.

Association Forum

Username:	Password:
Save Password
Forgot your Password?

All Forums

Catalina/Capri 25/250 Sailor's Forums

Catalina 25 Specific Forum

New motor mount location

New Topic

Topic Locked

Printer Friendly

Author

Topic

Ed Cassidy
Captain

Member Avatar

USA
365 Posts

Initially Posted - 05/27/2009 : 09:21:33

I'm installing a new mount and I think I can move it's location more towards the center of the boat. The current mount is about 4" from the port side of the boat. Is there some rule of thumb about how high/low it should be (the motor is a 20", not 25") and what kind of clearance there should be between the motor and the rudder?

Ed
HisHorse
1979 SR/SK #1393
Green Cove Springs, FL

Edited by - on

dmpilc
Master Marine Consultant

Members Avatar

USA
4593 Posts

Response Posted - 05/27/2009 : 11:18:07

You will want the cavitation plate just above the prop to be well under water when the motor is in the down position. As a practical guide, you'll want the bottom of the mounting plate on the motor mount to be almost in the water when the motor is in the lowest running position.
Several issues, does the new mount have the same vertical travel as the old? When you turn the tiller hard over, you don't want the rudder to make contact with the prop.
If the new mount's rails are wider than the old one, maybe you can use one or more of the outside holes and still get the motor a little closer to center without getting too close to the prop. When I replaced the mount on our C25 (starboard side), I was able to use the 2 holes closest to center, fill the other 2 holes, and drill 2 more a bit farther out, which worked for us. I could not go lower because of the shelf on the inside of the transom.

Edited by - on

danandlu
Navigator

Members Avatar

USA
175 Posts

Response Posted - 05/27/2009 : 15:58:16

Don't forget that your boat will "squat", lowering the stern when under power. I wish I'd checked for that first when I installed a new mount, electrical connector and motor. The connector that was above water when the hole was drilled at rest is sometimes submerged under power. I know it's supposed to be waterproof but...

Edited by - on

jerlim
Master Marine Consultant

Members Avatar

USA
1484 Posts

Response Posted - 05/27/2009 : 18:27:51

be careful about interfering w/ the rudder when moving it to center...

Edited by - on

Dave Bristle
Master Marine Consultant

Members Avatar

Djibouti
10005 Posts

Response Posted - 05/27/2009 : 19:25:47

What's the current mount? What's the new one? What's the engine shaft length (L or XL)? Do you want to keep it on port?

Edited by - on

Chris Z
Captain

Members Avatar

452 Posts

Response Posted - 05/27/2009 : 19:42:47

I would think you need to make sure that the rudder and motor will not hit each other when hard over towards each other. I can mount my rudder tomorrow and let you know how close they come to each other. I can also post picutres. Let me know if this would help.

Edited by - on

islander
Master Marine Consultant

Members Avatar

USA
4029 Posts

Response Posted - 05/28/2009 : 14:24:28

I would also consider the possible conflict with the engine cover hitting the upright rail on the stern rail when the engine is tilted up and leaned over. Also if not an electric start are you going to have trouble getting a good pull on the cord. Might have a conflict with the traveler bar or back stay. Any particular reason for moving the engine? It would seem to help keep the prop in the water when broadsided by a wake and the boat rocks but I can't think of an other reason.

Edited by - on

Ed Cassidy
Captain

Members Avatar

USA
365 Posts

Response Posted - 05/28/2009 : 18:37:48

I don't really have a good reason for moving the mount other than it is so far to port that the motor itself hangs past the port side of the boat when down and I'm installing a new mount. I won't get another chance very soon. In the current configuration, with the rudder full to starboard and the engine full to port, there is about 15 inches between the prop and the rudder. The motor is a 9.9 4 stroke Yamaha and the mount is a narrow stainless thing with 4 springs, two of which are broken. It looks like a cross between the motor mounts on Catalina direct but without stainless tubing.

Edited by - on

Dave Bristle
Master Marine Consultant

Members Avatar

Djibouti
10005 Posts

Response Posted - 05/28/2009 : 18:40:07

So you don't know what it is? Do you know its capacity?

Edit: Ohhhhh... I'm suspicious you have the very old Fulton aluminum mount with two flat bars very close to each other... If so, Y<b>OU SHOULD NOT USE THAT MOUNT FOR A YAMAHA 4-STROKE ENGINE!!!</b> It is SEVERELY too weak, and could fold and break under the combination of thrust and weight. (Fulton currently rates that bracket for a 5 hp 4-stroke engine, which is tiny compared to yours.) Catalina put them on way back when 8-horse 2-strokes weighed 65 lbs. and had barely enough thrust to push the boat--and even then, they quickly changed to the stainless tubular Garhauer brackets that they used for the rest of the run (up to 1991). Catalina Direct sells an upgraded version of the Garhauer bracket. Check it out.

Edited by - Dave Bristle on 05/28/2009 18:57:15

dmpilc
Master Marine Consultant

Members Avatar

USA
4593 Posts

Response Posted - 05/28/2009 : 19:00:53

If you have not purchased a new mount yet, buy the Garhauer mount from Catalina Direct. I think it is the best design for the C25. The 3 spring model is fine for the newer 4 stroke 9.9 motors under 100 lbs. The 4 spring model is overkill unless your motor is well over 100 lbs. If you bought a Fulton model 1810 or 1820, take it back to the store if you can, otherwise contact me before you start your installation. I can save you a lot of grief.

Edited by - on

Ed Cassidy
Captain

Members Avatar

USA
365 Posts

Response Posted - 05/29/2009 : 16:12:00

Here's what I have.....

And now you know the reason I need to replace it. I already have an OMC 15 HP mount to replace it.

Edited by - on

Dave Bristle
Master Marine Consultant

Members Avatar

Djibouti
10005 Posts

Response Posted - 06/01/2009 : 07:16:15

Hmmm... I've never seen that one.

Edited by - on

glen
Captain

Members Avatar

359 Posts

Response Posted - 06/01/2009 : 08:38:45

Ed that is the same one that I have my 10 horse Honda on. I have a small vang hooked to it to help lift it up. The springs are under powered, but the bracket is solid. I have replaced the original wood board with the composite board from CD

Edited by - on

jerlim
Master Marine Consultant

Members Avatar

USA
1484 Posts

Response Posted - 06/01/2009 : 12:29:35

Do you have any type of backing plates on the inside to help spread the load?

Edited by - on

glen
Captain

Members Avatar

359 Posts

Response Posted - 06/01/2009 : 13:27:49

Yes but it’s not the one from CD. I have a ½” thick aluminum plate that I cut same shape as the composite. I have the two items buddied up together. I think the backer plate (especially with a heavy outboard) is a good idea, and if you’re a salty (I’m not) you will probably want stainless.

Edited by - on

Dave Bristle
Master Marine Consultant

Members Avatar

Djibouti
10005 Posts

Response Posted - 06/01/2009 : 17:45:37

It's also important to round the corners of the backer, and even round or bevel the edges slightly where they will meet the fiberglass. This reduces the point-loading you can get from corners against a slighly curved or irregular surface.

Edited by - on

Topic

New Topic

Topic Locked

Printer Friendly

Jump To:

Association Forum

Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.