Micron rating for Westerbeke fuel filter 30548 - SailNet Community
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Micron rating for Westerbeke fuel filter 30548

All,

Anyone know what the micron rating is on the engine mounted filter #30548?

Can't seem to reach anyone at Westerbeke and the rating isn't listed in any of their sales info.

Note this is for a circa 1985 diesel.

Thanks,

Shrimp

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Re: Micron rating for Westerbeke fuel filter 30548

Go here: wixfilters.com ---> filter lookup (classification): OFF HIGHWAY ---> select 'make' (Westerbeke) ---> (Equipment type) Marine Engine ---> type in YOUR engine Model Number, etc. etc. Then, go to fuel filters and its appropriate data section for 然 ratings, etc.
Note: automotive type filters are 'nominally' rated, so there may be slight differences in 然 ratings between manufacturers.

WixFilters is a high value filter supplier to the automotive aftermarket, many private branded filters used by engine manufacturers are 'probably' made by WixFilters.

Last edited by RichH; 08-29-2016 at 03:12 PM.
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Re: Micron rating for Westerbeke fuel filter 30548

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Originally Posted by RichH View Post
Go here: wixfilters.com ---> filter lookup (classification): OFF HIGHWAY ---> select 'make' (Westerbeke) ---> (Equipment type) Marine Engine ---> type in YOUR engine Model Number, etc. etc. Then, go to fuel filters and its appropriate data section for 然 ratings, etc.
Thanks for the pointer. Unfortunately they only have the oil filter listed. I believe the engine is the W27. I will verify the exact model as there are a couple similar versions.

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Re: Micron rating for Westerbeke fuel filter 30548

Most marine diesel engines of that vintage were/are based on a '20然' specification for their fuel. If the filter you are replacing is the *engine mounted* filter, then any 然 between ~ 15 to 19然 (nominal rating) is typical. Some Volvos have different/'tighter' 然 requirements.

Typical set-up: tank --> 30然 (Racor) optional --> 10然 (Racor) --> 15-19然 (engine mounted) --> engine.
The engine mounted filter is intended to be a 'guard' or 'last chance' filter that protects the high pressure pump, in case any of the preceding filters in the system has a 'breakthrough' or fails. :-)

Most NAPA or other 'quality' automotive aftermarket parts stores can usually cross reference your Westerbeke part number to their filter 'brand'. Most NAPA filters are mfg. by Wix and similar higher quality automotive filter suppliers.
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Re: Micron rating for Westerbeke fuel filter 30548

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Originally Posted by cshrimpt View Post
All,

Anyone know what the micron rating is on the engine mounted filter #30548?
The on engine secondary filter is rated at 15-17 micron (source Joe J. & Bob B. Westerbeke engineers). Westerbeke does not want to see a primary filter any smaller than 10 micron before the secondary filter.

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Re: Micron rating for Westerbeke fuel filter 30548

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The on engine secondary filter is rated at 15-17 micron (source Joe J. & Bob B. Westerbeke engineers). Westerbeke does not want to see a primary filter any smaller than 10 micron before the secondary filter.
Thank you, this is what I suspected. My primary is a 2 micron and it clogs after less than 20 hours (usually when I'm trying to dock). I'm using 2 micron only because that's what the PO did, but I'm switching to 10 microns tomorrow.

Is the 2 micron standard a myth? It seems ridiculously small as 2 microns is about the size of an individual bacterium.

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Re: Micron rating for Westerbeke fuel filter 30548

The primary keeps the fuel clean the secondary protects the motor. That's how I learned it anyway.
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Re: Micron rating for Westerbeke fuel filter 30548

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Originally Posted by cshrimpt View Post
Thank you, this is what I suspected. My primary is a 2 micron and it clogs after less than 20 hours (usually when I'm trying to dock). I'm using 2 micron only because that's what the PO did, but I'm switching to 10 microns tomorrow.

Is the 2 micron standard a myth? It seems ridiculously small as 2 microns is about the size of an individual bacterium.

Shrimp
Size for size and surface area for surface area, if you only get 20 hours of run time using a 2然 in your 1st position filter, then changing to a 10然 will only get you less than 100 hours of run time before clogging. The 10然 filter (of equal surface area) will have 1/5th the flow resistance hence ~5 times the flow capacity (hence on-stream service life) of a 2然 of similar design. 20hrs. X 5 = 100 hours.
Although you should change your 2然 to a 10然, you most likely have a tank that has become contaminated with thick deposits of funguses (black sticky debris) and bacteria (small 'strings' of colonized bacteria) .... a strong indication that you need to CLEAN OUT your tank.

If you use a 2然 in substitution for a proper 10然 'nominally' rated filter (for YOUR engine design) you -
1. risk the premature breaking of the diaphragm inside your lift pump,
2. you will extrude the soft deformable particles (soft deformable particles such as fungi @3-5然 and individual bacteria @~.5然) right through that 2然 filter, these deformable particles do not 'burn' well and you will most probably form a thick deposit of 'coke' in your hot exhaust system which will ultimately block the exhaust flow.
3. If your fuel tank is contaminated, you will be changing a LOT of filters.

There is really NO place for a 2然 fuel filter in a diesel engine that was designed in accordance to the common 20然 specification (20然 'hard' particles defined as being the 'MOST' damaging particle size for this type engine).
Filters of this type are 'sized' based on gallons per hour PER sq. ft. surface area PER pounds per square inch resistance. If you somehow need to use a 2然 filter, you MUST then increase the surface area of that 2然 filter by a factor of 5(!!!!) to do the EXACT SAME JOB as with a 10然 filter .... and you're still going to change out that much bigger 5X surface area 2然 filter more often, because in 'nature' there's exponentially more particles in those 'smaller' 然 size ranges.

From your above latest testimony, there is a .... well beyond a reasonable probability .... that you need to CLEAN OUT your fuel tank. The typical "Racor" filter only has a 'dirt capacity' in the neighborhood of ~30-40 grams of typical diesel fuel 'crud', that smallish typical 15-19然 engine mounted 'guard' filter @ ~10 grams.

Typical set-up for a diesel engine set up for the 20然 specification:
tank --> 30然 (Racor) optional --> 10然 (Racor) --> 15-19然 (engine mounted 'guard filter') --> engine. All these ratings for fuel and lubricating oil filter are 'nominal' ratings, meaning arbitrary (not 100% removal) ratings.

;-)
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Last edited by RichH; 08-30-2016 at 11:16 AM.
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Re: Micron rating for Westerbeke fuel filter 30548

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From your above latest testimony, there is a .... well beyond a reasonable probability .... that you need to CLEAN OUT your fuel tank. The typical "Racor" filter only has a 'dirt capacity' in the neighborhood of ~30-40 grams of typical diesel fuel 'crud', that smallish typical 15-19然 engine mounted 'guard' filter @ ~10 grams.
;-)
Hmmm.. I had the yard clean out the tank this spring. Either they didn't do it properly, or they loosened a lot of gunk. The last clog occurred immediately after being rolled by a large wake from a speeding Sportfisherman that flew by me at top speed.

As I sped up to avoid him, the engine choked and died. It had been running fine for a couple of hours before that.

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Re: Micron rating for Westerbeke fuel filter 30548

Here's a quick simple test to determine if your fuel is contaminated .... either by a dirty tank or fouled fuel supplier:

• suck out about 4-6 oz. of diesel fuel from your tank
• put the oil into a clean clear glass container
• hold up the glass of oil between your eyeball and strong white light and with the light source 'aimed' through the glass of oil towards your eyeball. (A thin focused beam 'mag lite' works best)
• if there is ANY noticeable HAZE in the fuel AND/OR the fuel is 'dark' in color .... either your tank is (still) dirty, or your usual fuel supplier is selling very contaminated fuel.


Note: if you did have your tank cleaned and you didn't add a biological stabilizer (BioBor, etc.) it is quite possible for the 'remnants' of that previous contamination to grow exponentially into a new 'crop' of crud .... usually on the tank walls / tank bottom.

A good stop gap for a tank that needs to be cleaned; but, you may consume a LOT of filters:
https://www.amazon.com/Star-Brite-St.../dp/B001HWY7UE
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