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  Crack in Transom on 13 Classic; Vote on Repair?

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Author Topic:   Crack in Transom on 13 Classic; Vote on Repair?
John Fitzgerald posted 05-28-2002 05:38 PM ET (US)   Profile for John Fitzgerald   Send Email to John Fitzgerald  
I have a 72 hull sport classic with a 40 HP Johnson. My 12 year old is about to pass his boating safety course and since neither he nor my wife can lift the motor, I just installed a CMC tilt/trim bracket. Just as I finished, my wife pointed out that one of the lower bolts (with a square washer about 1.5x2 in.) had cracked (I mean broken not stress cracks in the gel)the interior fiberglass slightly.

Since the boat is otherwise ready to go, I'm thinking of patching the hull with West epoxy and a high strength filler and using a transom support plate to distribute the stress for this season (only). Am I too optimistic, crazy?

Highwater posted 05-28-2002 08:55 PM ET (US)     Profile for Highwater    
Your post is especially interesting to me because I have a 1972 13' and was making plans to install either the CMC vertical extensions or one of their vertical lifts (or both). Did the installation of the CMC product cause the crack? Could you post or email me a picture of the transom? Thanks!
JFM posted 05-29-2002 09:46 AM ET (US)     Profile for JFM  Send Email to JFM     
John & Highwater, the crack could have been caused by the curve of the transom. I have just installed a CMC manual jackplate on my 13' '72. In order to make the transition, I made shims similar to the installation on Cetacea 56.
John, are all your bolts through the top part and not under the blind inside of transom? Did you use shims?
I stayed in the top with shims and no bottom lag bolts. Regards, Jay
John Fitzgerald posted 05-29-2002 12:19 PM ET (US)     Profile for John Fitzgerald  Send Email to John Fitzgerald     
The boat is up in MA and I am in NJ so I can't get you a picture before next week.

To help deal with the transom curvature and because the trim bracket was flexible enough to compensate, I used T&H aluminum transom wedges on the outside of the hull. In this configuration, the PT 130 bracket only touches the wedges - not the fiberglass. My transom was previously drilled to BIA standard on the top holes but the bottom two holes were off-center so I had to drill/grind the bracket to fit. I am using the top two holes on the engine mount and the bottom slots (I think that they are 9+" apart. The bolts are reversed from the original so that the nuts are inside the splash well.

Jay, I am not sure what you mean by the blind side. The lower two bolts enter the boat a couple of inches below the "step" in the transom. I do not think that this is the brackets fault. The risk is that I can tilt the motor so far that the steering components (Teleflex) can hit the transom top. If I did that (stupid but possible) then the bracket would have been acting as a lever on the lower bolts, trying to pull them out. I am thinking of rigging a limit switch to prevent over tilting. Any thoughts?

JFM posted 05-29-2002 05:21 PM ET (US)     Profile for JFM  Send Email to JFM     
John, blind side is inside the transom under the motor well. Some guys use bolts through that section and cut through the inside gel, dig the foam out and use a cover plate after securing nuts. Others have used lag bolts low with 5200. Your application is like mine in that you stayed above that blind spot. I know I'm off the topic, but sounds like the upper limit of the tilt is the problem. Regards, Jay

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