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Diesel This is a forum dedicated to diesel engines and their applicable accessories.

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  • 1 Post By RichH
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Old 06-04-2012
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Yanmar 2QM15/primary fuel filter

so I just bought this boat. When i went to change fuel filters, oil, and filter i found there was not a primary/water seperator filter. the only filter is the secondary on the engine. the boat is a 78 model and has probally been this way for a while. do you think i shlould add one or since it isnt broke dont fix it?

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Old 06-04-2012
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Re: Yanmar 2QM15/primary fuel filter

The 2QM and 3QM engines were supplied with an engine mounted 'guard' filter at 15-17ÁM 'nominal' retention 'rating'. The 'guard filter' is the teeny filter that is mounted ON the engine; the only purpose of the 'guard' is to protect the engine fuel pumps IF any upstream filter fails.
For 'best' protection, there should be a 10ÁM (Racor, etc. type) filter that precedes the engine guard. If your fuel tankage is notorious for historically releasing 'slugs' of debris or you get your fuel from 'notoriously' dirty fuel depots (ie.: marinas), then the 10ÁM should be preceded by a 30ÁM nominal rated Racor type filter.

Simple Speak: put a 10ÁM 'upstream' of the engine mounted 15ÁM, if the 10ÁM plugs rapidly then put a 30ÁM upstream of the 10ÁM and/or clean out the tank.

Tank ---> 30ÁM (optional) ---> 10ÁM ----> 15-17ÁM (engine 'guard') ---> engine.

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