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Old 08-18-2014, 11:07 AM   #1
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Ford Lehman 120 Engine Mounts

Time to replace the engine mounts and I am looking for feedback on brands, part numbers and overall experience.

I do know that I can phone up American Diesel and get suitable mounts, but I want to know what other options there are.

Thanks in advance.
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Old 08-18-2014, 12:43 PM   #2
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I have used Barry Controls and Metalastic on various projects, with good results from both. Volvo and Aquadrive sometimes use Metalastic, Cummins uses Barry. Mounts must be specified to the weight per mount for it to "float" properly. The mount companies have websites with drawings and weight tables.

This can be quite a PITA as it is unlikely for everything to plug and play. Dimensions will be different and holes in wrong places.

The factory Lehman mounts were very stiff and transmitted alot of vibration near idle.

My preference right now is Barry mounts. Metalastic allowed a bit more motion than I was comfortable with.
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Old 08-18-2014, 02:42 PM   #3
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I would look into installing: http://www.robush.co.uk/pdf/Cushyfloat.pdf
Along with: Federal Flexible Couplings

Used together these make for a very smooth, vibration free boat.
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Old 09-04-2014, 03:31 PM   #4
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Quote:
Originally Posted by Capt.Bill11 View Post
I would look into installing: http://www.robush.co.uk/pdf/Cushyfloat.pdf
Along with: Federal Flexible Couplings

Used together these make for a very smooth, vibration free boat.
I whole heartedly agree, I used this combination (well the mounts were from Aquadrive front part #'s 014-6050222 55 shore and rear #'s 014-6050223 65 shore - $88 each - but they look almost identical to the Cushyfloats) and it made a HUGE difference.

Honestly don't notice any difference with the Federal Couplings (I ran for a month with just the mounts changed, just installed the couplings today) but at least they will take up some misalignment under high loads or in a rough sea.
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Old 09-04-2014, 04:48 PM   #5
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I would look into installing: http://www.robush.co.uk/pdf/Cushyfloat.pdf
Along with: Federal Flexible Couplings

Used together these make for a very smooth, vibration free boat.
Capt. Bill,

What part # for the cushyfloat?
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Old 09-04-2014, 05:57 PM   #6
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Cushyfloat and Metalastic same thing. I think you look up metalastic on the web, there is a catalog there.
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Old 09-05-2014, 10:22 AM   #7
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Thanks for the feedback guys - I'll sit down and have a look at your recommendations. Gearing up for some winter projects on the boat, this being one of them.

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Old 09-05-2014, 10:54 AM   #8
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Capt. Bill,

What part # for the cushyfloat?
I don't recall. As Ski mentioned check out the catalog.

If you use the soft mounts, IMO you really need to use some sort of isolation coupler to make up for the fact that with softer mounts you're going to have more misalignment between the transmission and shaft since the engine will "float" more on the soft mounts.
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Old 09-05-2014, 12:19 PM   #9
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I don't recall. As Ski mentioned check out the catalog.

If you use the soft mounts, IMO you really need to use some sort of isolation coupler to make up for the fact that with softer mounts you're going to have more misalignment between the transmission and shaft since the engine will "float" more on the soft mounts.
While this does not relate specifically to Ford Lehman, here is an excerpt from the Yanmar engine installation manual as it relates to flexible engine mounting. For those who do not already know, Yanmar is known for supplying very flexible engine mounts on their marine diesels. They clearly state "When the engine is installed with the flexible engine mount method, a flexible coupling or flexible stern tube must be employed." The illustration in the manual actually shows R&D, Vetus and Aqua-Drive couplers.

I'm sure this advice is applicable to most marine engine installations. The softer the mounts, the more important a flexible coupling becomes. Here is a copy of that section of the manual.
Attached Files
File Type: pdf Flexible Engine Mounts.pdf (186.3 KB, 97 views)
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Old 09-05-2014, 12:55 PM   #10
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I use Poly Flex.

Most engine mounts are rubber and allow movement but reflect it like a rubber ball. Poly Flex is some kind of new age plastic and actually absorbs some vibration.

Mine are quite smooth and I recomend them.
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