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Lifting Lehmans to change motor mounts

 
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rustylewis
Archimedes
Poulsbo, WA
1978 42' Classic #572

Joined: 07 Feb 2010
Posts: 80

PostPosted: Tue Jan 09, 2018 2:16 pm    Post subject: Lifting Lehmans to change motor mounts Reply with quote

I am getting ready to change the motor mounts on our old boat. What is the best way to jack up the engines to make the swap?
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Rusty

blog.mvarchimedes.com
Pacific NW Grand Banks Owners Association
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Tom Overs
Little Ship
Portavadie Scotland
1973
Supporting Member

Joined: 24 May 2002
Posts: 2906
England

PostPosted: Tue Jan 09, 2018 2:22 pm    Post subject: Reply with quote

I used a strong piece of wood over the engine and a "Spanish" windlass. That's a rope with a piece of wood inbetween that you wind to shorten it.

You only have to lift the engine an inch to be able to change the mounts.

Nessetity is the mother of all inventions. Razz

Tom.

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GB32-390
"Little Ship"

Born to cruise...........once forced to work!
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Bernie Tresner
Madeline
Gig Harbor, WA
1970 GB32-219

Joined: 08 Oct 2005
Posts: 218
Gig Harbor, WA

PostPosted: Wed Jan 10, 2018 4:46 am    Post subject: Reply with quote

If you take off one bracket at a time and remove the bracket and motor mount from the engine and reinstalling back on the engine with new mount on the bracket. Adjusting mount, the other 3 mounts will hold the engine in place. I was able to change the mounts in about 2-3 hours and had to do very little adjusting.

I can't remember where I learned this (age I suppose), but it was brilliantly simple to do.

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Bernie Tresner
GB 32-219
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rustylewis
Archimedes
Poulsbo, WA
1978 42' Classic #572

Joined: 07 Feb 2010
Posts: 80

PostPosted: Tue Jan 16, 2018 12:45 am    Post subject: Reply with quote

Thanks! I went by the boat this weekend to check on a few things. I will use a a beam across the hatches. The lifting looks straightforward. I need to go up just over two inches.

Here are the fancy new motor mounts.

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Rusty

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denogail
Gadabaut
Manistee, Michigan
1988-GB-42CL

Joined: 05 Aug 2007
Posts: 446

PostPosted: Tue Jan 16, 2018 12:24 pm    Post subject: Reply with quote

Rustylewis...from your photo, that right front motor monunt in the picture does not look bad, in the first place. Lots of rubber, and it does not appear to be flat or squashed.

You should send a series of photos to Brian at ADS and ask his oppinion first...I have the same type as pictured...

When I run one engine or the other, I get very little vibration, smooth. However, when I run both engines, especially at an idle, and they beat together, I can walk the coffee pot across the stove top...but that is just the two of them doing something harmonic...?

Just thinking outloud here...DenO
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rustylewis
Archimedes
Poulsbo, WA
1978 42' Classic #572

Joined: 07 Feb 2010
Posts: 80

PostPosted: Tue Jan 16, 2018 1:10 pm    Post subject: Reply with quote

The port motor visibly vibrates several inches side to side at normal cruise (1650 rpm). We also replaced the shaft and cutlass bearings on that side a year or so ago. I've had two mechanics suggest we replace the mounts. I can't find anything that says they have been replaced so it makes sense (at least to me) to go ahead and replace them.
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sailsaway
Ruby G.
Prosper, VT
1971 GB36-231
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Joined: 04 Oct 2007
Posts: 297
Vermont

PostPosted: Tue Jan 16, 2018 2:36 pm    Post subject: Reply with quote

Broken or loose engine mount to engine stringer bolts could also allow for the amount of movement you describe.
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J. R. Good
"Ruby G."
GB36-231
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Barry L
Grand Travail
Baton Rouge La.
1971 36' Classic #198
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Joined: 28 Mar 2005
Posts: 1648
baton rouge la

PostPosted: Wed Jan 17, 2018 7:35 am    Post subject: Reply with quote

If you unbolt the motor support casting from the motor you will only need to raise the engine a scunch to remove the mount. Just saying.
Barry

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Barry and Debbie
1970 Grand Banks 36' Classic #198
"Grand Travail"
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rustylewis
Archimedes
Poulsbo, WA
1978 42' Classic #572

Joined: 07 Feb 2010
Posts: 80

PostPosted: Fri Jan 19, 2018 1:22 pm    Post subject: Reply with quote

I have checked all the bolts and can find nothing loose.

I will try both lifting and unbolting the mounts to see which is easier.

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