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Old 03-31-2019, 02:34 PM   #1
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Lehman 225 engine mounted fuel filter replacement?

Headed down to the boat to change the filters. Any tips or tricks? This will be my first time.

Thanks
Steve
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Old 03-31-2019, 04:36 PM   #2
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roll of paper towels & HD trash bag
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Old 03-31-2019, 05:49 PM   #3
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roll of paper towels & HD trash bag
And beer...got it
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Old 03-31-2019, 06:01 PM   #4
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Just make absolutely sure you put the correct gasket in the proper place. These are not O rings but square cross section gaskets. If I remember correctly the gaskets may be different sizes, or not, just check carefully. Mine take about 75 pumps on the plunger to prime after changing. It really isnít too bad just go slow and check that the gaskets are in the correct place and that the old gasket came out with the filter. I had one stick and didnít notice it right away, it sure leaks air in then...
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Old 03-31-2019, 06:04 PM   #5
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Greetings,
Mr. S. Hold off on the beer until done. I'm assuming CAV type filters, Also have close at hand: diapers, trash bucket, small containers to drain filter housing once you loosen but NOT remove the filter housing, more diapers, more paper towels.


Wear safety glasses and protective gloves. Make doubly sure you have the old o-rings removed (sometimes they hide) and you put the new o-rings in the proper locations (I think they may be different diameters).


I have found it advantageous to fill the new filters with a weeny funnel through the bleed hole after snugging everything up. It lessens the amount of priming you have to do with the fuel lift pump lever. An alternative is use an oil can (filled with diesel) to fill through the bleed hole.







Aw snap!!! Mr. C beat me by three minutes...Yup, not really o-rings but you'll see what we mean.
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Old 03-31-2019, 09:55 PM   #6
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Thanks guys for the help. I didnít get to the boat until 8 tonight. Decided to tackle this another day. Doesnít look like a lot of fun, especially the starboard engine.

Maybe later this week Iíll give it another shot.
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Old 03-31-2019, 10:13 PM   #7
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It is intimidating the first time, but go ahead and give it whirl. Let us know how it goes.
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Old 03-31-2019, 10:27 PM   #8
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It is intimidating the first time, but go ahead and give it whirl. Let us know how it goes.
Will do. Iím anxious to do it. We had the starboard engine quit on us leaving us on one engine during our last trip. Iím hoping those filters are to blame.
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Old 03-31-2019, 10:40 PM   #9
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Sounds like a plan, just be careful not to inkect another problem into the equation. Double check everything you do during the filter change. Good luck!
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Old 04-01-2019, 07:28 AM   #10
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And don't be afraid to let the engines idle for 15 to 20 minutes after the filter change to make sure all the air is out of the lines and filters.
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Old 04-01-2019, 07:51 AM   #11
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I have the same set of engines in a much smaller boat (36'). It takes me 10-15 min per engine to change 2 micron secondary filters. I use ziplock large freezer bags to put under and over the filter while unscrewing. I use 90 deg pick to extract the upper gasket. DO NOT forget to replace the tiny O ring gasket on the long bolt. And then priming. 20-25 pumps per filter. This is the easiest part. Nothing to be afraid about. You may have to bleed the high pressure pump using the side valve (NEVER touch the cylinder supply fuel lines)
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Old 04-03-2019, 09:17 AM   #12
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Thanks for the advice everyone.

What exactly is the process of getting the old filters out and new ones in? I donít want to take apart more than I have to.

Iíll be going down to the boat early next week.
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Old 04-03-2019, 09:34 AM   #13
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Greetings,
Mr. S.
-Put on your safety glasses and gloves if you want to wear gloves.
-Get everything ready and very close to hand. Paper towels, diapers, TRASH PAIL, mirror, wrenches, small pick to take out top gasket, small container to drain filters, small container of clean diesel & small funnel (or oil can as I suggested above) to fill filters.
-Assume a comfortable position.
-Put diaper(s) under filters.
-Drain filters, one at a time, into small container via the white spigot on the bottom of each housing.
-Change diaper when you make a mess.
-Loosen nut on the top in the middle of the housing.
-Change diaper
-Remove filter and make SURE you remove the o-ring/gasket that will be in the top of the housing (use mirror and small pick).
-At the same time you remove the first filter element and gasket take note of the sizes of the gaskets and which one goes where.
-Change diaper.
-Wipe housing (top and bottom) with paper towel to remove any oil or dirt.
-Reassembly is the reverse of the above minus the multiple diaper changes making SURE the upper gasket is properly seated in the square groove in the housing. Some put a light coating of oil on the gaskets before installing but I've done without.
-Snug up the bolts and fill the filters with clean diesel.
-Bleed the rest of the system.
-Wipe everything down with paper towels and check for leaks.
-Close sea cock and try to start engine making sure that IF it starts you immediately open the sea cock.
-Check for leaks again.



Have that beer now while the engine runs for 15 or 20 minutes just to make sure you've purged all the air.
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Old 04-03-2019, 10:42 AM   #14
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Firefly's procedure is spot on.

The part I usually forget is to bleed the system all the way to the injector pump. That becomes obvious when I start the engine and it runs for about 10 seconds then dies. It is mentioned above but be sure the 2 large gaskets don't get twisted when installing them and there is a small round gasket in the center of the housing.

I like the oil can idea. I always use a funnel and end up spilling more diesel to clean up.
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Old 04-03-2019, 10:45 AM   #15
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Greetings,
Mr. NW. Aw snap! I forgot about the bolt gasket-Thanks. Hear that Mr. S?
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Old 04-03-2019, 10:49 AM   #16
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Greetings,
Mr. NW. Aw snap! I forgot about the bolt gasket-Thanks. Hear that Mr. S?
Yes. Thatís a perfect write up. Exactly what I was looking for. Thank you! I owe you one.
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Old 04-03-2019, 11:09 AM   #17
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Old 04-03-2019, 02:08 PM   #18
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Make sure you know how to bleed the system after the change over.
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Old 04-10-2019, 06:11 PM   #19
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Just did the port engine filters in about 30 minutes. Really not hard, just messy. Starboard engine isnít going to be as much fun.

But now I canít get this port engine started. I pumped that plunger about 60-80 times and had my electric priming pump going. Felt resistance with the plunger. Engine started and ran for About 10 seconds then dying. Now I just absolutely cannot get it to start. These pants are supposed to be self priming, so I donít get it. I even cracked the return line off the pump and made sure fuel was coming out of it, which it was. This happened a couple months to me when I ran I tank dry. The port engine just took me hours and hours to finally get to start.

Iím gonna work on the starboard engine now and see how it goes
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Old 04-10-2019, 06:41 PM   #20
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Change the filter. Then crack a vent on the top housing. Then pump lever. Stop when fuel starts coming out, then snug the vent. Pump a few more times, start engine. Both filters need to be vented of air as above.

With filter all closed up as you did it, pumping the lever only pushed air into the inj pump. If you open a vent, air comes out there and inj pump stays full of fuel.
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