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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 Lifting an Engine		  New Topic  Topic Locked
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redeye
Master Marine Consultant

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3476 Posts
Initially Posted - 10/26/2012 :  04:12:25  Show Profile
187 lb Johnson 40hp with a Catalina boom vang block and tackle to lift it..

Should I worry???
Ray in Atlanta, Ga.
"Lee Key" '84 Catalina 25
Standard Rig / Fin Keel
Edited by - redeye on 10/26/2012 04:51:18

Prospector
Master Marine Consultant

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Canada
3159 Posts
Response Posted - 10/26/2012 :  05:28:33  Show Profile  Visit Prospector's Homepage
First, I didn't realize a 40hp was that heavy.

The only way I can see this going wrong is if the rope is old and breaks, the sheaves are old and brittle, the bearings jam, the attachment to the cieling is poor, the pins in the shackles fail, or the attachment to the outboard is bad. Apart from that, what could possibly go wrong?

I would do it. You like load that setup more in a gybe than you will with the engine. Provided of course that the equipment is in good shape and properly attached.
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redeye
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3476 Posts
Response Posted - 10/26/2012 :  05:50:00  Show Profile
Yepper.. the specs I read in the manual lists it at 187 or 178 lbs. I read from another post with a similar engine at 150lbs. Either way it appears the foot and mount are pretty beefy, I'm guessing to support a power tilt that came with some of the engines. 1985 Johnson 40hp Model# J 40 ELCO

I've got another line as a backup and clamping it to a stand pretty quickly. Having to drive the trailer and aluminum boat hull to a scrap yard.

And it is such a pretty weekend to Sail.... seems like chores always attempt to rear their ugly heads..

Edited by - redeye on 10/29/2012 06:29:37
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JohnP
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1520 Posts
Response Posted - 10/26/2012 :  06:11:28  Show Profile
Don't worry - Be happy!!!

With a 3:1 boom vang you need the line to be strong enough to hold 1/3 of the weight (about 63 lbs), but each double braid line should have a breaking strength of >200 lbs. (Maybe 300-400-500 lbs?). That's much more than needed for safe use as a hoist.

I bet the blocks themselves are over-engineered, as well. I wouldn't trust my boom vang to lift 1000 lbs., though.

From the Harken website's [url="http://harken.com/loadingformulas/"]calculator [/url]for the end boom maximum working load of the mainsheet blocks and line with a 30 knot wind is 591 lbs. During a 40 knot gust, the boom exerts 1050 lbs of force on the mainsheet system. These are common occurences on our boats, and the mainsheet system never fails, and is over-engineered for these large, temporary loads.

Similar to the mainsheet, the boom vang must routinely withstand several hundred pounds of load.

Harken sells many types of 29 mm diameter (1-1/8") and 43 mm diameter (1-9/16") blocks, and the [url="http://www.harken.com/blocks/blocks.php"]Harken website[/url] lists all of them having maximum working loads of a few hundred lbs. and breaking loads of twice or three times that force. This is when used singly, so in a 3:1 or 4:1 boom vang each component experiences 1/3 or 1/4 of the load.

The breaking loads for my own blocks that are made by other manufacturers are probably similar, since those makers compete with the best equipment, like Harken's blocks.

Don't worry - Be happy!
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redeye
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3476 Posts
Response Posted - 10/26/2012 :  06:58:26  Show Profile
Thanks Prospector and John.. that does make me feel better hearing it although I logically knew it was in that neighborhood ( 600-800lb ratings )... The weak point to me was the connection to the block, the older single swivel shackle on the block which Harken lists at 300lbs for the 40mm series ( new ).

I just lifted 550lb Snipe sailboat out last week on two tackles that were not marine equipment, but I was not worried if the Snipe hit the ground ( old Grlfrnds )


Anyhoo... wish me luck and a quick step should it fall! I'm hoisting it tonight.
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Prospector
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Canada
3159 Posts
Response Posted - 10/26/2012 :  07:43:48  Show Profile  Visit Prospector's Homepage
Slow and steady is all I have to add. You can do anything a half an inch at a time!
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DaveR
Master Marine Consultant

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USA
2015 Posts
Response Posted - 10/26/2012 :  09:40:26  Show Profile  Visit DaveR's Homepage
Looks exactly like my 74' Johnson 50. Still runs great!
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jerlim
Master Marine Consultant

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USA
1484 Posts
Response Posted - 10/27/2012 :  05:42:46  Show Profile
What will you tie it off to while under load...or is this a lift and drop? I also suggest moving the single wheel to be as close as you can get it to the vang.
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redeye
Master Marine Consultant

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3476 Posts
Response Posted - 10/29/2012 :  04:55:24  Show Profile
<< What will you tie it off to while under load >>

The cams held it. I had another line under the engine if it slipped. Just lifting it long enough to mount on a stand.

I worked well but the smallest shackle on the bottom made me uneasy, the pin looked so small. Added a newer shackle. One more lift to sell it. I'll post some picks later.
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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.