Engine Mounts (1" Stud)

Part Number: 800-051

Determining Engine Mount Weight Capacity

Below are the formulas to use to determine the required pounds per engine mount.

Formulas

Front Engine Mount

(W x 0.4) x 0.5 = lbs per mount

Back Engine Mount

(W x 0.6) x 0.5 = lbs per mount

W = weight of engine and gearbox

Example:

Total weight of engine and gearbox = 1,200 lbs.

Front Engine Mount

(1,200 x 0.4) x 0.5 = 240 lbs per mount

Back Engine Mount

(1,200 x 0.6) x 0.5 = 360 lbs per mount

General Weight Distribution

R&D Marine Engine Mount weight distribution

Find the center of gravity by balancing on a roller (If possible)
If the center of gravity cannot be found, assume a weight distribution of 60% on the rear engine mounts, with 40% on the front engine mounts (if the rear engine mount is in line with the flywheel)

$ 150.00

Note: Make sure your measurements match your application.

Description
Determining Engine Mount Weight Capacity
Technical Specifications

Description
- Designed for marine use, accepts propeller and engine thrust in both directions.
- Offers a fail-safe design.
- Are height adjustable.
- Pre-loaded to reduce movement.
- Slotted holes in the base to assist in alignment.
- Mount types to fit all applications.
The R&D Marine Engine Mounts are designed specifically for the rigors of marine applications. The mounts are stiff enough to absorb forward and reverse propeller thrust, yet soft enough to isolate drivetrain vibrations from the hull.

To help increase the longevity of the mounts, all steel parts are zinc plated and passivated to limit corrosion. The rubber component is covered by an oil shield to protect it from petroleum-based products.

R&D Marine mounts are preloaded based on the combined engine and transmission weight to limit engine movement. To facilitate the ease of installation the mounts are height adjusting and the mounting holes in the base of the mount are slotted to assist in the alignment of the drivetrain.

Available for most brands such as Yanmar, Perkins, Universal, Westerbeke, and many more.
Determining Engine Mount Weight Capacity

Below are the formulas to use to determine the required pounds per engine mount.
Formulas

Front Engine Mount

(W x 0.4) x 0.5 = lbs per mount

Back Engine Mount

(W x 0.6) x 0.5 = lbs per mount

W = weight of engine and gearbox

Example:

Total weight of engine and gearbox = 1,200 lbs.

Front Engine Mount

(1,200 x 0.4) x 0.5 = 240 lbs per mount

Back Engine Mount

(1,200 x 0.6) x 0.5 = 360 lbs per mount
General Weight Distribution
1. Find the center of gravity by balancing on a roller (If possible)
2. If the center of gravity cannot be found, assume a weight distribution of 60% on the rear engine mounts, with 40% on the front engine mounts (if the rear engine mount is in line with the flywheel)

Technical Specifications

Part #	Stud Size	Capacity Per Mount	Foot Print	Mount Pre-Loaded	Deflection	Minimum Height	Maximum Height
800-051	1"	80-235 lbs	4"	0.09"	0.09"-0.21"	3.47"	5.45"
800-052	1"	120-415 lbs	4"	0.09"	0.09"-0.21"	3.47"	5.45"
800-053	1"	250-565 lbs	4"	0.09"	0.09"-0.21"	3.47"	5.45"
800-054	1"	300-685 lbs	4"	0.09"	0.09"-0.21"	3.47"	5.45"
800-066	1"	500-1,301 lbs	5.5"	0.12"	0.12"-0.25"	4.59"	7.16"
800-067	1"	650-1,701 lbs	5.5"	0.12"	0.12"-0.25"	4.59"	7.16"
800-068	1"	1,100-2,101 lbs	5.5"	0.12"	0.12"-0.25"	4.59"	7.16"
800-055	1"	500-1,201 lbs	5.5"	0.12"	0.12"-0.25"	4.66"	6.34"
800-056	1"	650-1,501 lbs	5.5"	0.12"	0.12"-0.25"	4.66"	6.34"
800-057	1"	880-2,001 lbs	5.5"	0.12"	0.12"-0.25"	4.66"	6.34"

Good work!

1) I chatted online with Eric Young who was excellent in helping me to identify my old mounts & provide order number for new
2) a couple days later, once I’d confirmed the old mounts were toast (threads rusted so bad they were unlikely to be adjustable for realignment) I was able to go online & easily order the correct replacements
3) AND specify rapid shipment vis UPS that actually worked across the border and up into rural Canada.
Shipment worked, mounts bolted directly in place, and alignment was easy. Lots o’ stars for PYI.

5 star all the way

great product and service, set arrived with one mount wrong weight raqnge replacement was overnighted along with prepaid return lable for wrong mount. The R&D mounts are high quality, comparing the original Yanmar mounts to the R&D mounts I'll just say is like comparing a ford pinto to ferrari

Helpful Staff

I called to ask about motor mounts and I was immediately connected to an engineer who helped answer all of my questions about the mounts compatibility and performance. I have not yet installed these mounts on my boat, but I'm confident they'll work great.

Great sales support

Sales assisted for seamless return of incorrect parts. Thanks

R&D Marine Perkins 4.108 Engine Mounts

Excellent product delivered promptly as requested. However, I erred in ordering. These are not low profile mounts and we're 10 -15 mm too tall to fit my application. All other dimensions were a perfect fit. I regret that I won't be able to observe how these mounts attenuate vibration in service.