800066
$ 715.00 USD
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Below are the formulas to use to determine the required pounds per engine mount.
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

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

| Part # | Stud Size | Capacity Per Mount | Foot Print | Mount Pre-Loaded | Deflection | Minimum Height | Maximum Height |
| 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" |
I ordered this kit to replace the engine mounts for a Yanmar 4JH-5E on my Valiant 40. The mounts do fit the engine perfectly, but they did not fit the fiberglass braces on the boat. I would have worked on this, but the diesel mechanic said that this was no longer necessary. I contacted PYI and they immediately issued a return number. I have bought fenders and a max-prop from PYI before and I have always been impressed by the quality and the service.
Worked with PYI for the last 16 years, always excellent service, answered all my questions and got my orders out on time and the way I needed them shipped. Technical support has been great.
Awesome customer service and technical support at the highest engineering level of PYI' s vast marine product inventory is exceptional. !!!!!!!
Not knowing which type of mounts that were your required, your technical support person went over the various types which was extremely helpful since there were no information available from the engine manufacturer.
Fits and works great!