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Old 24-02-2022, 17:47   #1
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Replace SD50 with SD60 in L400

Good evening, I would like to hear about potential issues that may arise when removing the Yanmar SD50ís and replacing with Yanmar SD60ís. I have a 2010 L 400 and would like to know if there will be any space issues or constraints with this conversion. Also, if anybody has already done this, what problems did you encounter? I would appreciate any and all information and feedback as I am trying to decide if this is the right thing to do and if it can be done without a major refit. Thanks in advance for your helpful thoughts and information
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Old 24-02-2022, 18:14   #2
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Re: Replace SD50 with SD60 in L400

Great question. IMO, the SD40 & 50 are only light-duty SDs, not really meant for cruising, given their built-in obsolescence (although you can now upgrade them with a real steel roller-bearing instead of their silly copper thrust-washer, but the kit's $500/side).

I'm afraid I can't shed any light, but I'm also interested. We have a pair of 25yo 4JH2 engines with SD31s, each with 9,000 hours. They still run OK, & I've replaced most of the bearings & seals in the SD31s, but at some point, I'm going to need to upgrade things as well.
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Old 24-02-2022, 18:22   #3
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Re: Replace SD50 with SD60 in L400



you can retrofit the SD50 for an SD60 however there are a couple of things to note:

- base mounting configuration of the SD60 differs from SD50 so Yanmar sell an adaptor plate to bolt to the bed and then SD60 bolts to that.

- height of SD60 is slightly taller so you need packers under the engine mounts to lift the engine slightly to line up with SD60 height.
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Old 25-02-2022, 21:43   #4
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Re: Replace SD50 with SD60 in L400

See this thread as Post 3 has the Official Yanmar SD50 to SD60 instructions:
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Old 27-02-2022, 06:11   #5
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Re: Replace SD50 with SD60 in L400

Out of interest why are you changing the SD50s out, how many hours on them?
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Old 27-02-2022, 09:57   #6
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Re: Replace SD50 with SD60 in L400

Montanan has it right. Need about 1.5 or 2" clearance at the end of the SD for the adapter plate - needed because the drive/engine mount is different.
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Old 07-03-2022, 23:35   #7
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Re: Replace SD50 with SD60 in L400

As stated by a previous posted, I too am interested in the reason for changing out SD 50s for SD 60's. I changed out our old SD 50s for 60s on our former Lagoon 410. The only reason I changed out the motors was that we had near 10K on the hour meter and we were offered a sensational deal on the purchase and installation of the new motors which was just to good to say no to.

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