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Old 08-18-2014, 10:07 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, 11:43 AM   #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, 01:42 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, 02:31 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, 03:48 PM   #5
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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.
Capt. Bill,

What part # for the cushyfloat?
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Old 09-04-2014, 04:57 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, 09:22 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, 09:54 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, 11:19 AM   #9
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Originally Posted by Capt.Bill11 View Post
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.
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File Type: pdf Flexible Engine Mounts.pdf (186.3 KB, 126 views)
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Old 09-05-2014, 11:55 AM   #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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Old 03-05-2018, 01:01 PM   #11
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Hi
I'm looking to renew my original engine mounts on both of my Lehman 120's sometime soon.
Does anyone have any information as to what load/weight engine mounts I would require?
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Old 03-05-2018, 02:18 PM   #12
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Hi Eurobanker40,

Where in the UK are you? We lived in Ipswich for 2 years.

Welcome to POLYFLEX LEHMAN MASTER LISTING ENGINE MOUNTS - THERMOBOAT LTD. is the North American supplier of products to make your boat experience WARM, QUIET, COMFORTABLE and SAFE

This from American Diesel:
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Old 03-05-2018, 02:29 PM   #13
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It's times like this when I wish I only had one Lehman
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Old 03-05-2018, 04:07 PM   #14
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Check the attachment holes on the prospective mounts to the engine beds to see how they align with the existing mounts. Also, check the height/travel of the adjustment nuts. We changed the mounts on our FL SP135. There were a lot of mounts that fit the specs for the motor weight and hp but the mounting of the mounts and the adjustment studs/nuts/travel didnít work. I ended up going with a direct replacement from Bomac Marine and I know American Diesel sells them. I didnít want to deal with making modifications to the shaft log or the engine bed. A 1/4Ē difference at the mount is a lot by the time it gets to the shaft log. We paid about $120/mount US. The rear mounts were different than the front but the same cost.
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Old 03-05-2018, 05:25 PM   #15
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Do Ford Lehmans have internal vibration dampers? Just asking, donít have these engines but my buddies boat seems to create significant vibration at low/medium rpm and I wondered why.
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Old 03-05-2018, 06:13 PM   #16
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They have drive dampers, according to AD, their replacement interval is 2500 hrs. When our twin Lehman's are idling you can literally see the water around the boat vibrate. My engines only have 1100 hours on them and there are far higher priorities for my boat bucks right now but when the time comes; I'm encouraged by what other's have reported using newer mounts and coupling.
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Old 03-05-2018, 09:20 PM   #17
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I am in the middle of changing my motor mounts now. I have twin Lehman 120's.

My experience with Poly Flex ... The gentleman in Victoria was very helpful and even went and visited the boat when it was in Sidney to be sure we got the right mounts. He also delivered the mounts to the boat. Unfortunately, the first set he delivered didn't fit. The mounting stud was too wide for the holes on the engine side. He kindly returned them and ordered us new ones.

So two weekends ago, we went to change the mounts. The front mounts were straightforward. The back mounts didn't fit. They were too wide and hit the mounting arm on the back of the motor.

After going back and forth with Poly Flex for a couple days, they decided they didn't have motor mounts that would fit our old boat.

I exchanged a few calls, emails, and photos with Brian at American Diesel. New motor mounts I know will fit should arrive Friday. Just in time for the weekend.
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Old 03-05-2018, 10:28 PM   #18
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I have just been down this road. On my boat, the rear engine mounts utilize brackets that come off the side of the transmission. When sourcing new mounts, I ran into all kinds of limitations: overall height, bolt spacing and stud diameter. I couldn't find a set of mounts that were low profile, had the existing spacing and required stud diameter that would fit with the old transmission brackets. They just didn't have enough clearance.

So I have just finished having new brackets for the transmission fabricated so they would provide proper clearance - which gave me several choices for a mount that would work. While it was a bit time consuming, I feel that this gives me the best options moving forwards.


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Old 03-06-2018, 05:02 AM   #19
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Mounts purchased from Aqua Drive are also Cushyfloat.
The amount of movement can be selected by choosing a durometer (rubber hardness) of mount that will limit deflection to whatever you want. See attached deflection chart page 2. Be sure and include the weight of your gear in calculations, divide by 4.

The easiest is direct replacement. Too often other mounts are to too tall, the footprint won't fit the available space, or as noted the mount itself interferes with the brackets.

A nice feature of Cushyfloats is they can be purchased unassembled. This means if they will fit your application you can jack the engine up just enough to get a sawsall blade on the existing stud and just cut it off. Slide the old mount out and slide the new one in and thread in the new stud from above with some locktite on it. If your replacement mount stud is not removable you may have to jack the engine high enough to slip in the replacement. This probably means disconnecting things like exhaust, shaft, maybe plumbing and wire.

Another consideration as mentioned is a packing gland on a hose and/or a coupling. There are formula's using shaft diameter / alloy for figuring allowable deflection depending on the distance from the gear flange to the first bearing or fixed packing gland. The longer the shaft, the more flexible the mounts can be.

The Cushyfloat line is a very good mount and a great value, they are very reasonably priced.

And for you Eurobanker, Trelleborg (Cushyfloats) is a UK Company.

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Originally Posted by Ski in NC View Post
Cushyfloat and Metalastic same thing. I think you look up metalastic on the web, there is a catalog there.

Cushyfloat Product Range - Trelleborg IAVS

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Old 03-06-2018, 02:58 PM   #20
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Hi all, really appreciate all this information. It's certainly made me realize there's a few important things to consider. I'm waiting to hear back from a few companies but will update you all as things progress.
Would anyone have any idea as to the weight of the Lehman 120?
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