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Old 06-18-2021, 03:44 PM   #1
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Need help bleeding my Yanmar 4JH3-TE

I have a relatively new to me Yanmar 4JH3-TE on which I did the first fuel filter change yesterday. Now I have a couple of problems. The engine, which ordinarily fires instantly with no throttle, now needs large throttle input to start. and when it starts also won't hold a steady RPM and stalls when pulled back to idle.

Here's what I did: I installed a new Racor primary filter and a new Yanmar secondary filter. After that, I bled the air at the top of each filter until there were no evident air bubbles.

When the engine began to behave as I describe above, I then cracked the injector nuts on each of the 4 cylinders with the engine running to bleed each cylinder. I got bubbly fuel out of each nut which does not seem to be slowing down after 10 seconds or so of this. I've gone back to each nut a couple of times but the bubbly fuel continues, which makes me wonder if there is now air in the injection pump.

I don't see any manual pump lever for bleeding the fuel injection pump or any other place between the secondary filter and the injector nuts.

If any of you have this engine, can you tell me what am I missing?
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Old 06-18-2021, 04:01 PM   #2
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i would try to keep that yanmar going with the throttle to see if it clears the air out. yanmars are pretty good at pushing air through.

if that doesn't work check the seals on the filters you installed. it shouldn't be that complicated. i never had to crack injectors on my yanmars.

make sure to reopened fuel valve
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Old 06-18-2021, 05:32 PM   #3
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Thanks. Will try running for a longer period. Fuel valve is definitely open.
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Old 06-18-2021, 06:00 PM   #4
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Racors are easy to mess up the seals. Make sure you installed the filter right as it will cause exactly the problems you are experience if messed up. Google Racor to see videos on the subject.

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Old 06-18-2021, 06:07 PM   #5
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It sounds like you are getting air into the fuel system somewhere. Start at the Racors and check the O rings and make sure you didnít leave an old O ring in with the new one. Then try to start. If the problem doesnít change start looking at the secondary filter. Make sure the O rings or gaskets are seated properly and you didnít accidentally leave an old O ring or gasket in and now have 2 in there. It is fairly easy to do. I donít know exactly how Yanmars seal their filters, but check bery closely. Good luck.
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Old 06-18-2021, 08:44 PM   #6
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Weirdly, the Racor primary that I removed had a chamfered seal at the perimeter of the filter (it is the spin-on variety of filter). The replacement filter came with a much smaller diameter square edged seal that seats around the center post, but no new perimeter chamfered seal.

So I used both the old and the new. I've always used cartridge style Racors in the past, so this arrangement was new to me. Not sure if using both seals was right or not ...
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Old 06-18-2021, 09:03 PM   #7
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Are you sure that you have the correct replacement element. It doesnít sound right that you added a gasket. That may be the problem but I am not familiar with the spin on Racors.
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Old 06-18-2021, 10:22 PM   #8
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Racors are easy to mess up the seals. Make sure you installed the filter right as it will cause exactly the problems you are experience if messed up. Google Racor to see videos on the subject.

David
I once accidentally crimped the o-ring of the Racor tee handle which allowed air into the system.

The bleed procedure on my 6LPA-STP Yanmar is to crack the nut on the downstream end of the flex hose coming out of the engine mounted filter while pushing the manual pump knob atop the filter housing rather than messing with the injector lines.
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Old 06-19-2021, 07:11 AM   #9
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Quote:
Originally Posted by Creek View Post
Weirdly, the Racor primary that I removed had a chamfered seal at the perimeter of the filter (it is the spin-on variety of filter). The replacement filter came with a much smaller diameter square edged seal that seats around the center post, but no new perimeter chamfered seal.

So I used both the old and the new. I've always used cartridge style Racors in the past, so this arrangement was new to me. Not sure if using both seals was right or not ...
1- air in the fuel is making it run poorly. fix air leak and will run like new again.
2-Were the replacement primary filter EXACTLY the same model number? Racor has many filters that look and are numbered nearly the same but are not. Double check with the original. If that does not work, start over with a new element and gaskets.
3- The fuel priming lever is on the mechanical fuel lift pump not the injection pump.
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Old 06-19-2021, 07:22 AM   #10
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The questions several of you have raised about the Racor primary have me thinking. I purchased a replacement filter of the same number as the existing Racor filter that was installed when I got the boat. But removing it was nearly impossible because it was on so tight and it required a level of force that badly dented the filter. Makes me wonder if it was tightened that much to stop an air leak that may have been there the last time this was changed.

Which makes me now wonder it this is the correct filter # for that Racor housing, even though I purchased the identical replacment filter #. Unfortunately, there is no Racor product brochure with my paperwork so I don't know which Racor housing it is to look up compatible Racor filters.
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Old 06-19-2021, 07:29 AM   #11
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Can you post a couple clear pictures? Old filter vs new and the filter head.
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Old 06-19-2021, 07:34 AM   #12
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Can you post a couple clear pictures? Old filter vs new and the filter head.
Will do that later this morning.

Also, not having any luck looking up the filter housing online to see what part number it is.
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Old 06-19-2021, 08:15 AM   #13
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I've now taken pictures, but it seems as if I cannot post them except from a website, but not from my laptop. Is that right? (Don't have a website where they are available.)

Also, I realized I mis-spoke about the primary being a Racor. It is actually a Yanmar primary filter/water separator. The replacement element is #YAN 120650-55020. I removed an element with a slightly different # - 120650-55010. Don't know if that refers to 10 vs 20 micron or if means something different, but perhaps that is the cause of all of this.

If could upload a picture, perhaps one of you will know the part number of the filter housing and I could look up compatible filters. But I'd have to be able to upload a picture for that ...
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Old 06-19-2021, 08:29 AM   #14
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How to post pictures
https://www.trawlerforum.com/forums/...res-50850.html
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Old 06-19-2021, 09:20 AM   #15
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Pictures hopefully attached below.
Attached Thumbnails
Fuel filter pic 1.jpg   Fuel filter pic 2.jpg   Fuel filter pic 3.jpg  
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Old 06-19-2021, 09:25 AM   #16
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Additional information - the notes written by the original owner many years ago say it takes a Yanmar fuel filter part # 4230-0100. Somewhere along the line a different replacement part was used. Not sure if the one that is there now is incompatible.

Many thanks to Archie for the link to picture uploading.
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Old 06-19-2021, 10:18 AM   #17
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Maybe time to call Yanmar and ask what filter is supposed to be used.
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Old 06-19-2021, 10:58 AM   #18
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Maybe time to call Yanmar and ask what filter is supposed to be used.
Ordinarily I'd do that, but because the primary fuel filter is separate from the engine, it is not necessarily associated with the 4JH3-TE. I think I need to know the part number for the filter assembly so I can identify the correct fuel filter.

I was hoping someone here has the same filter assembly and could either reference that number or tell me what filter is compatible.
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Old 06-19-2021, 10:59 AM   #19
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hi, we have a pair of 4jh3-te on our boat. on ours (circa 2003) the yanmar filter is mounted on the engine and has a screw in gray plastic bottom with wires for the water detection. i believe, last change was a long time ago, the cartridge has a square edged o-ring on top and a round o-ring on the gray bottom. i also believe the 4jh3-te has the lift pump built into the injection pump.

i'd be looking at a leaky o-ring.
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Old 06-19-2021, 11:03 AM   #20
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based on my parts notes, the on engine filter element is part # 129574-55711.

again this is a 2003 and yes yanmar is constantly changing part numbers.
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