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Old 06-23-2021, 08:28 AM   #1
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City: green cove springs
Vessel Name: GEM
Vessel Model: Mainship Pilot 34
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6lya-stp oil sw thread?

hi all,

i'm trying to connect a mechanical oil pressure gauge to my 6lya-stp. does anyone know the thread size or a complete gauge that will thread in?

GEM 2003 Mainship P34
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Old 06-23-2021, 09:00 AM   #2
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Vessel Model: Mainship Pilot 430
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Give Mastry Engine Center in Clearwater a call, they supplied many of the Yanmar engines to Mainship. They have been extremely helpful to me over the years. 727-522-9471
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Old 06-23-2021, 10:53 AM   #3
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It may be a JIS thread Japanese system), similar if not identical to the British pipe thread system. I discovered this when plumbing the coolant to the water heater. A 3/8 NPT (US system) nipple fit, but just barely. It grabbed about 3 threads which was marginal.

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Old 06-23-2021, 08:52 PM   #4
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Vessel Name: Louisa
Vessel Model: Custom Built 38
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BSP tapered thread. I bought adapters from a Parker hydraulic shop. They knew what I was looking for.

You could chase it with a 1/8 x 27 NPT tapered tap, but not recommended.
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