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Old 13-02-2020, 13:07   #16
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Re: Volvo Penta D1-30 Rubber Cushions - any alternative ?

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Originally Posted by Suliwar View Post
3) the softer the better.
A slight disagreement on this point. Ideally, yes, but. This is depending on the shaft configuration. If the engine transfers the thrust from the propeller to the boat through the vibration dampers, they need to be harder then they would be if you have a flexible coupling and thrust bearing.

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Old 13-02-2020, 14:31   #17
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Re: Volvo Penta D1-30 Rubber Cushions - any alternative ?

simplest answer....


R&D Marine Ltd.
Meadow Works
Clothall Road
Baldock
Herts
SG7 6PD
England
Telephone: +44 (0)1462 892391 Fax: +44 (0)1462 896448
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Old 13-02-2020, 15:36   #18
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Re: Volvo Penta D1-30 Rubber Cushions - any alternative ?

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Originally Posted by MartinR View Post
A slight disagreement on this point. Ideally, yes, but. This is depending on the shaft configuration. If the engine transfers the thrust from the propeller to the boat through the vibration dampers, they need to be harder then they would be if you have a flexible coupling and thrust bearing.

.
Something about 90 durometer will absorb vibration but maintain alignment.
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Old 13-02-2020, 15:55   #19
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Re: Volvo Penta D1-30 Rubber Cushions - any alternative ?

Hey Guys...

You don't have to use exactly the same part as the original manufacturer, but marine engine mounts are NOT functionally the same as ones for automobiles. It's not just a price difference based on market.

In a car, there is NO thrust load at all. The engine mounts just have to absorb vibration. On a boat, ALL of the load of the propeller pushing the boat forward--and backward--is transmitted up the prop shaft, through the engine, through the mounts, to the hull. The loads they see are completely different than with a road engine. That's why they are rated based on the engine's weight and horsepower.

The idea that you can homebrew one of these and have it properly tuned to the the engine's weight and thrust load is pretty naive of the actual engineering involved.

All of the above assumes you have a standard prop shaft configuration. There are systems where the propulsion thrust load is carried other ways, but they aren't nearly as common.
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Old 13-02-2020, 16:31   #20
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Re: Volvo Penta D1-30 Rubber Cushions - any alternative ?

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Originally Posted by billknny View Post
Hey Guys...

You don't have to use exactly the same part as the original manufacturer, but marine engine mounts are NOT functionally the same as ones for automobiles. It's not just a price difference based on market.

In a car, there is NO thrust load at all. The engine mounts just have to absorb vibration. On a boat, ALL of the load of the propeller pushing the boat forward--and backward--is transmitted up the prop shaft, through the engine, through the mounts, to the hull. The loads they see are completely different than with a road engine. That's why they are rated based on the engine's weight and horsepower.

The idea that you can homebrew one of these and have it properly tuned to the the engine's weight and thrust load is pretty naive of the actual engineering involved.

All of the above assumes you have a standard prop shaft configuration. There are systems where the propulsion thrust load is carried other ways, but they aren't nearly as common.
My "Old Man" mounted a couple of 671s with crash boxes on Lord mounts that where used for shock mounts for delivery of machines of the co. I worked for. Worked great. I wish I had pics of the mounts with adjustments up and down and side to side. Six per engine and Twin Disc. Some times there id more than one way to skin a cat.
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Old 14-02-2020, 03:15   #21
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Re: Volvo Penta D1-30 Rubber Cushions - any alternative ?

Here’s a plan. Look up “perkins Perama” at Parts4engines in UK. The Perama is the same base engine as the VP 2030. The mounts are £15-20 each on the website.
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Old 14-02-2020, 06:44   #22
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Re: Volvo Penta D1-30 Rubber Cushions - any alternative ?

This outfit will make new mounts using the metal parts from your old ones.

[URL="http://www.then-now-auto.com/"]
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Old 14-02-2020, 07:52   #23
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Re: Volvo Penta D1-30 Rubber Cushions - any alternative ?

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Here’s a plan. Look up “perkins Perama” at Parts4engines in UK. The Perama is the same base engine as the VP 2030. The mounts are £15-20 each on the website.
Yes, it's a plan, but it might be problematic......

When V.P. sold the MD 2010,2020,2030, and 2040 line of marineized ISM (Perkins) engines, the flex mounts that they used were sourced from Metalastic. These are the mounts with the inverted gold colored cover. Widely used by many engine companies.

When they moved to the more recent D1-13,20,30 and D2-40,50,55,60,75 they continued to use these mounts. However, it was found that the D1-20 and D1-30 engines, even though similar to the 2020 and 2030, didn't work well with the Metalastic mounts. Lots of vibration complaints, and VP switched to the cast aluminum mounts that are still used today. Don't recall who makes the current mounts.

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Old 14-02-2020, 09:49   #24
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Re: Volvo Penta D1-30 Rubber Cushions - any alternative ?

DougR, any idea when VP switched to the cast aluminum mounts? On 6-year-old D1-30F we have Trelleborg Metalastik Cushyfloat https://www.trelleborg.com/en/anti-v...product--range
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Old 14-02-2020, 10:48   #25
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Re: Volvo Penta D1-30 Rubber Cushions - any alternative ?

This change from Metalastik mounts to cast aluminum mounts took place very early on the production life of the D1-30 inboard engine, and was still in place when I left the company in 2011. That said, there have been some changes since that time:
- saildrive engines- some parts sources show Metalastik mounts on the front of saildrive packages, other sources show the aluminum mounts....

- inboard engine- sources show the cast aluminum mounts at all four corners, but there appears to be an additional option of a three mount solution, with a single cast aluminum mount centrally located in the front.

I have reached out to former colleagues for clarification and will report back if I find out anything of significance.
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