Reply
 
Thread Tools Search this Thread Display Modes
 
Old 06-06-2018, 03:31 PM   #1
Member
 
City: Palos Heights, Il
Country: usa
Vessel Model: 31' Offshore steel trawler, Sable
Join Date: Feb 2017
Posts: 17
Micron size filters

Could I use a 30 Micron Racor filter or should I use a 10. Naturally aspirated 100 HP diesel??
__________________
Advertisement

CaptFun is offline   Reply With Quote
Old 06-06-2018, 03:33 PM   #2
Guru
 
dhays's Avatar
 
City: Gig Harbor
Country: United States
Vessel Name: Kinship
Vessel Model: North Pacific 43
Join Date: May 2015
Posts: 7,238
Quote:
Originally Posted by CaptFun View Post
Could I use a 30 Micron Racor filter or should I use a 10. Naturally aspirated 100 HP diesel??

Primary or Secondary? What does your engine manual say?
__________________

__________________
Regards,

Dave
SPOT page
dhays is offline   Reply With Quote
Old 06-06-2018, 03:41 PM   #3
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 4,815
What engine?

In general, either would be ok. I use 10 unless it clogs too quickly, then may use a 30. The secondary is what defines the cleanliness at the injection system.

Some engines do spec a 30 as a primary.
Ski in NC is online now   Reply With Quote
Old 06-06-2018, 03:52 PM   #4
Member
 
City: Palos Heights, Il
Country: usa
Vessel Model: 31' Offshore steel trawler, Sable
Join Date: Feb 2017
Posts: 17
The Primary. The Secondary is a NAPA 10 Micron.
CaptFun is offline   Reply With Quote
Old 06-06-2018, 04:33 PM   #5
Guru
 
City: Between Oregon and Alaska
Country: US
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 1,270
The usual configuration for boat sized diesels is 30 micron primary and 10 micron secondary. Those sizes keep particles out of the fuel that cause major damage to fuel system components.
But there are advantages to running really clean fuel - longer injector and pump life. I run a 2 micron primary and the filter lasts about 500 hours. But my tanks are clean and I buy clean fuel from dealers that maintain their tanks and filters. Not just any marina.
Lepke is offline   Reply With Quote
Old 06-06-2018, 05:22 PM   #6
Guru
 
caltexflanc's Avatar
 
City: North Carolina for now
Country: USA
Vessel Name: Small Incentive
Vessel Model: Boston Whaler 130 Sport
Join Date: Aug 2011
Posts: 4,804
Whatever the engine manufacturer specifies.
__________________
George

"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
caltexflanc is offline   Reply With Quote
Old 06-06-2018, 08:37 PM   #7
Guru
 
Comodave's Avatar
 
City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 3,217
I run 10 micron primaries since the secondaries are a pain to change and bleed.
Comodave is offline   Reply With Quote
Old 07-01-2018, 10:46 PM   #8
Senior Member
 
kapnd's Avatar
 
City: hawaii
Country: usa
Vessel Name: #31
Vessel Model: ex-Navy MUB 50 fish/cruise
Join Date: Aug 2013
Posts: 487
Quote:
Originally Posted by CaptFun View Post
Could I use a 30 Micron Racor filter or should I use a 10. Naturally aspirated 100 HP diesel??
Ideally, both.
Two stage primary filtration starting with a 30 mic, then a 10mic, followed by a 2 mic secondary.
Read all about it at sbmar.com, they will not lead you wrong.
__________________
You can lead a horse to water,
But you can't make him ski...
kapnd is offline   Reply With Quote
Old 07-02-2018, 01:49 AM   #9
Senior Member
 
alfamike's Avatar
 
City: Camarillo
Country: USA
Join Date: May 2015
Posts: 298
Fuel Filter - Micron sizing Question

You need to give us a little more information, different mfgrs. have different recommendations, So what Make, Model, age & type of engine ?
Does engine have filters on it & what are they & do you want to have to change your on engine filters regularly, or would you rather change your before engine RACOR's or what ever you have more often.

Different Diesel Engine Makers have different injector systems, also year of manufacturer means different specs.

KAPND is absolutely correct about the recommended way to do it.

But then the question is - do you have even dual series fuel filters ?

I like to run a smaller filter than 10 microns in my RACORS to save how often I must change the factory fuel filters on the engine.

So I run 2 micron filters & that has worked for me for 4 decades.

30 micron first then a 10 (or 2 micron in my case) next, then your factory on engine filters as back up as no filter stops 100% of everything, 100% of the time.

Better safe than sorry I say.

Good Luck.

Alfa Mike
alfamike is offline   Reply With Quote
Old 07-10-2018, 08:20 AM   #10
Veteran Member
 
City: Saint Joseph, Mi
Country: usa
Join Date: Apr 2018
Posts: 29
Thank you one and all. I removed my primary filter out of the hell hole. I mounted a water seperator follow by 2 racors (10 micron) in series. I attached the 3 units to starboard and hung it from a pilot house floor stringer. I now remove the stairs and there it is, life is good
CaptFun6068 is offline   Reply With Quote
Old 07-10-2018, 10:14 AM   #11
Guru
 
City: Fort Myers
Country: USA
Join Date: Jul 2013
Posts: 1,050
You really should do step filtration, as someone else posted Tony Athen's website which he talks a lot about that, also understand ultra fine can put an extra load on fuel pump. As many have stated you should follow the manufacturers recommendations.
Human nature is if 10 micron is good 2 micron is even better, and that's not always the case.... Good luck!
Marlinmike is offline   Reply With Quote
Old 07-10-2018, 10:21 AM   #12
Guru
 
psneeld's Avatar
 
City: Avalon, NJ
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 18,530
While step filtration is fine and really the preferred method, many of us running 2 gal per hr diesels have run 2 micron primary and secondary filters for decades with great results.

With a vacuum gauge, you can tell if there is a strain on the fuel pump.... and go from there.
psneeld is online now   Reply With Quote
Old 07-10-2018, 12:04 PM   #13
Guru
 
Heron's Avatar
 
City: Cypress Landing Marina (NC)
Country: USA
Vessel Name: Heron (2)
Vessel Model: '88 Cape Dory 28 Flybridge #115
Join Date: Nov 2014
Posts: 1,246
Quote:
Originally Posted by kapnd View Post
Ideally, both.
Two stage primary filtration starting with a 30 mic, then a 10mic, followed by a 2 mic secondary.
Read all about it at sbmar.com, they will not lead you wrong.
Exactly how my boat is set up...
__________________
Steve
Heron is offline   Reply With Quote
Old 07-10-2018, 12:11 PM   #14
TF Site Team
 
Baker's Avatar
 
City: League City, Tx
Country: Texas
Vessel Model: Carver 356
Join Date: Oct 2007
Posts: 6,079
I run 10 micron Primary Racor 900s with Cummins spec on engine secondaries....no clue what micron(2 I think) but it is what is specced for the engine.
__________________
Prairie 29...Perkins 4236...Sold
Mainship Pilot 30...Yanmar 4LHA-STP...Sold
Carver 356...T-Cummins 330B
Baker is offline   Reply With Quote
Old 07-12-2018, 05:43 AM   #15
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 18,556
Remember the rating on the filter is nominal, not absolute , so those 2 filters will still pass 30 chunks at times.


That is why multiple filters in a row work so swell , and are mostly needed on modern electric injection systems.
FF is offline   Reply With Quote
Old 01-26-2019, 05:04 PM   #16
Veteran Member
 
VJameslanza's Avatar
 
City: Punta Gorda
Country: United States
Vessel Name: Encore
Vessel Model: 1988 Albin 40 Sundeck trawler
Join Date: Dec 2016
Posts: 47
10 micron Racor as Primary

We have been using a 10 micron primary (Racor 500FG) for the last 22 months (Since we bought Encore), and in the last year, I've had to drain about 1/2" of 'junk' from the filters every few months.

This last week, a trip to Captiva was taken in less than ideal conditions, and we hobby horsed for 3 hours steady. During a routine Engine Room check while underway, I found about 1" of 'junk' at the bottom of one of the Racors (the other was negligible). My manifold allows me to isolate one filter (I use both all the time), which I did, and drained the 'junk'. I filled the filter with fresh diesel, and upon bringing back online, about 1/2 of 'junk' filled the bottom of the clear bowl. During the entire trip home, the engines ran flawlessly at 1700-1800 rpms, but during the 5 hour trip the filter gained almost 1" of (you guessed it) 'junk'. At home, I tested it for water, Negative. I drained the bowl into a clear container and let it settle. Attached is the result.

Alge? Bacteria? Have birds been crapping in my fuel tank?
I replaced the Racor filters with new 10 micron (the old ones had no evidence of green anything in them), but I thought what the heck...Your thoughts?
Attached Thumbnails
Click image for larger version

Name:	Alge.jpg
Views:	48
Size:	99.0 KB
ID:	84618  
VJameslanza is offline   Reply With Quote
Old 01-26-2019, 05:20 PM   #17
Grand Vizier
 
Delfin's Avatar
 
Join Date: Jan 2010
Posts: 3,356
Quote:
Originally Posted by VJameslanza View Post
We have been using a 10 micron primary (Racor 500FG) for the last 22 months (Since we bought Encore), and in the last year, I've had to drain about 1/2" of 'junk' from the filters every few months.

This last week, a trip to Captiva was taken in less than ideal conditions, and we hobby horsed for 3 hours steady. During a routine Engine Room check while underway, I found about 1" of 'junk' at the bottom of one of the Racors (the other was negligible). My manifold allows me to isolate one filter (I use both all the time), which I did, and drained the 'junk'. I filled the filter with fresh diesel, and upon bringing back online, about 1/2 of 'junk' filled the bottom of the clear bowl. During the entire trip home, the engines ran flawlessly at 1700-1800 rpms, but during the 5 hour trip the filter gained almost 1" of (you guessed it) 'junk'. At home, I tested it for water, Negative. I drained the bowl into a clear container and let it settle. Attached is the result.

Alge? Bacteria? Have birds been crapping in my fuel tank?
I replaced the Racor filters with new 10 micron (the old ones had no evidence of green anything in them), but I thought what the heck...Your thoughts?
That's some nasty looking fuel. From the photo it looks like water, which suggests you have a way for water to get into the tank.
Delfin is offline   Reply With Quote
Old 01-26-2019, 05:29 PM   #18
Veteran Member
 
VJameslanza's Avatar
 
City: Punta Gorda
Country: United States
Vessel Name: Encore
Vessel Model: 1988 Albin 40 Sundeck trawler
Join Date: Dec 2016
Posts: 47
Tested with Gasoila Water Finding Paste, and the results were negative.
VJameslanza is offline   Reply With Quote
Old 01-26-2019, 05:33 PM   #19
Guru
 
kchace's Avatar
 
City: Brookline, NH
Country: USA
Vessel Name: Blue Heaven
Vessel Model: Albin 43 classic double cabin, twin 135 Lehmans
Join Date: Sep 2013
Posts: 1,290
If that was coming out of my fuel tanks I'd be pretty concerned. That is not at all normal. I would suggest getting the tanks cleaned.

Ken
kchace is offline   Reply With Quote
Old 01-26-2019, 05:43 PM   #20
Grand Vizier
 
Delfin's Avatar
 
Join Date: Jan 2010
Posts: 3,356
Quote:
Originally Posted by VJameslanza View Post
Tested with Gasoila Water Finding Paste, and the results were negative.
Be that as it may, it is a clear liquid, denser than water. Kind of narrows down the possibilities to water, glycerin and sulphuric acid.
__________________

Delfin is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 01:17 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012