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Old 04-13-2024, 01:35 PM   #1
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Oil plug size

I have a 2017 Seneca 37TS With a 6.7 litre Cummins Diesel Every where I read the plug Fomoto replacement is F104n. I ordered that and it is too small. I don't know if the one they sent me was the right one. So if somone knows the thread size that would be great
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Old 04-13-2024, 06:09 PM   #2
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I have a 2017 Seneca 37TS With a 6.7 litre Cummins Diesel Every where I read the plug Fomoto replacement is F104n. I ordered that and it is too small. I don't know if the one they sent me was the right one. So if somone knows the thread size that would be great
My 2014 (also a M2 chassis) uses a 22mm/1.5 thread drain valve. FG-7BN

Here's an Amazon link to the valve I used, has a nipple so you can attach a hose to drain it easily into a container and the wind won't glow it around! I also use their lever clip to be double-sure it doesn't open unexpectedly. I also installed a Fumoto drain valve on the generator to make service easy on it. But generator needs an adapter to replace the drain plug and then the valve screws into the adapter.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Old 04-13-2024, 06:54 PM   #3
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That makes sense as the 18mm I got was obviously too small. Thanks
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Old 04-13-2024, 06:58 PM   #4
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That makes sense as the 18mm I got was obviously too small. Thanks
At some point Cummins did change to the 18mm plug, most of the S2RV chassis Senecas do have the smaller plug.

Consider the generator valve too, makes it much easier! If you need the part numbers I have them too.
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Old 04-13-2024, 07:12 PM   #5
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At some point Cummins did change to the 18mm plug, most of the S2RV chassis Senecas do have the smaller plug.

Consider the generator valve too, makes it much easier! If you need the part numbers I have them too.
That would be great
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Old 04-13-2024, 07:29 PM   #6
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That would be great

You have to buy two pieces; an adapter that screws in place of the original 1/4" pipe thread drain plug. And then the valve itself with its (included) fiber washer. There also is a lever clip that locks it in place if you want extra protection

F-107N Engine Oil Drain Valve - https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Adapter - https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Locking clip - https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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