Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 25-05-2020, 12:25   #1
Registered User
 
sanibel sailor's Avatar

Join Date: Feb 2013
Location: Ocala FL
Boat: 1979 Bristol 35.5 CB
Posts: 1,953
Yanmar fuel bleeding question

Yanmar engine 3TNE74C

I have a problem with my Yanmar powered diesel lawnmower, leak due to bad fuel hose to injection pump that I trimmed shorter and clamped. No more leak. Ran for 15 secs after, then sputtered out and does care to restart. I assume it is air in fuel system. Can’t find much online but I see a similar one for marine use so thought someone might chime in.

I have full fuel in filter, don’t see a bleed screw on the injection pump, cracked the pipes at the injectors, cranked it and got fuel at least out of most forward pipe. Would not start. Then the battery started getting low and the rain started so I called it quits.

Looked at manuals online and don’t see a bleeding process listed. Is this thing self-bleeding?

It ran right after cutting the bad end off the hose so I doubt a solenoid issue.

I know I need to get a well charged battery on it, but looking for advice before I head back out for the next try.
__________________
John Churchill Ocala, FL
NURDLE, 1979 Bristol 35.5 CB
Currently hauled out ashore Summerfield FL for refit
sanibel sailor is offline   Reply With Quote
Old 25-05-2020, 13:49   #2
running down a dream
 
gonesail's Avatar

Join Date: Mar 2006
Location: Florida
Boat: cape dory 30 MKII
Posts: 3,106
Images: 7
Send a message via Yahoo to gonesail
Re: Yanmar fuel bleeding question

the yanmar manual says you bleed to the high pressure fuel pump .. no need to crack fuel injectors.
__________________
some of the best times of my life were spent on a boat. it just took a long time to realize it.
gonesail is offline   Reply With Quote
Old 25-05-2020, 17:36   #3
Registered User
 
sanibel sailor's Avatar

Join Date: Feb 2013
Location: Ocala FL
Boat: 1979 Bristol 35.5 CB
Posts: 1,953
Re: Yanmar fuel bleeding question

I don't see a bleed screw on the pump itself.
__________________
John Churchill Ocala, FL
NURDLE, 1979 Bristol 35.5 CB
Currently hauled out ashore Summerfield FL for refit
sanibel sailor is offline   Reply With Quote
Old 25-05-2020, 17:56   #4
Moderator and Certifiable Refitter
 
Wotname's Avatar

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 20,242
Re: Yanmar fuel bleeding question

Quote:
Originally Posted by sanibel sailor View Post
I don't see a bleed screw on the pump itself.
In that case, crack the joint where the low pressure fuel enters the injector pump and bleed it there first.
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is online now   Reply With Quote
Old 25-05-2020, 17:58   #5
Moderator Emeritus
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
Re: Yanmar fuel bleeding question

It is probably self bleeding, my boat 4JHE is and the JD 997 mower that I had that had a Yanmar 3 cyl diesel was also. It took awhile though to crank of you ran it dry on fuel though. I’d suggest jumping it from the truck, 10 sec crank 1 min off three times then 10 min cool down, but I don’t think it’s going to take all three attempts, heat build up is the starters enemy, that’s why three attempts with a min between attempts, then a 10 min rest.
Starting limitations for a turbine, except a 30 min rest, but attempts take longer and it’s a much bigger starter so it takes longer to cool.

Normal bleeding is done at a aftermarket filter with a bleeder screw, but my 997 didn’t have those provisions and didn’t have a lever on the manual LP pump either.
a64pilot is offline   Reply With Quote
Old 25-05-2020, 19:06   #6
Registered User
 
sanibel sailor's Avatar

Join Date: Feb 2013
Location: Ocala FL
Boat: 1979 Bristol 35.5 CB
Posts: 1,953
Re: Yanmar fuel bleeding question

The bad hose was the low pressure feed to the injection pump. It runs uphill and almost no fuel spilled when disconnected so it did not drain forward, did not seem that there was back-drainage either. Don't think much air got in there, of course it doesn't take much.
I am now away from the property but will take a fresh battery up next weekend. No power on site, so no battery charger available.
__________________
John Churchill Ocala, FL
NURDLE, 1979 Bristol 35.5 CB
Currently hauled out ashore Summerfield FL for refit
sanibel sailor is offline   Reply With Quote
Old 26-05-2020, 09:03   #7
Registered User

Join Date: Nov 2017
Location: Portland, Oregon USA
Boat: Island Packet, Packet Cat 35
Posts: 943
Re: Yanmar fuel bleeding question

All the Yanmar's I have bled have a 10mm bolt that I crack open and bleed through.
It looks like a bolt but is actually the bleed screw
Cpt Mark is offline   Reply With Quote
Old 26-05-2020, 10:36   #8
Moderator Emeritus
 
roverhi's Avatar

Join Date: Aug 2005
Location: Carlsbad, CA
Boat: 1976 Sabre 28-2
Posts: 7,505
Send a message via Yahoo to roverhi
Re: Yanmar fuel bleeding question

Ran my 2GM out of fuel. Had to bleed all the way to the injectors to get it to run. Yeah I know I was stupid. Only had to bleed from bolt by secondary filter all other times.
__________________
Peter O.
'Ae'a, Pearson 35
'Ms American Pie', Sabre 28 Mark II
roverhi is offline   Reply With Quote
Old 26-05-2020, 11:23   #9
Registered User

Join Date: Jun 2014
Posts: 22
Re: Yanmar fuel bleeding question

The primary bleeding point is on the very top of the engine fuel filter. This works for all air issues upstream of that location. Given that your issue was further downstream of that bleed point, you will need to crack open each injector in turn and bleed air from each one. There is a small metal tab on the fuel suction pump (NOT the high pressure fuel pump) for pumping the diesel. I wrap a blue paper shop towel around the injector to catch the fuel drips when bleeding. It also makes it very visible when the fuel is coming out. Work from closest injector to farthest downstream injector. Don't round off the injector nuts!!!, best to get a good 10mm flare nut wrench to do it as you get one extra corner vs. open end wrench. Total time less than 6 minutes.
rhirwin is offline   Reply With Quote
Old 26-05-2020, 11:27   #10
Registered User
 
Captn_Black's Avatar

Join Date: Jan 2009
Location: Cabo Verde
Boat: Bruce Roberts Spray, 36' Steel Junk-Rigged Schooner
Posts: 1,245
Images: 26
Re: Yanmar fuel bleeding question

Quote:
Originally Posted by sanibel sailor View Post
Yanmar engine 3TNE74C

I have a problem with my Yanmar powered diesel lawnmower, leak due to bad fuel hose to injection pump that I trimmed shorter and clamped. No more leak. Ran for 15 secs after, then sputtered out and does care to restart. I assume it is air in fuel system. Can’t find much online but I see a similar one for marine use so thought someone might chime in.
I would say that the culprit is the trimmed hose. Did you use a compression olive to get a tight fit? Or maybe you jammed it too far into the injection pump and interfered with the valve inside the case at that point?
__________________
"Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing." Robert E. Howard
Captn_Black is offline   Reply With Quote
Old 29-05-2020, 13:07   #11
Registered User
 
sanibel sailor's Avatar

Join Date: Feb 2013
Location: Ocala FL
Boat: 1979 Bristol 35.5 CB
Posts: 1,953
Re: Yanmar fuel bleeding question

Fixed. Thanks for all the help.
After letting it rest for a week, tried cranking again. Nothing

Hooked up fresh battery. Nope

Looked more closely with better light and recognized there is a bleedscrew on the pump inlet. Had not seen it earlier due to poor lighting. Did not see a hole or notch in screw so I pulled it completely. That resulted in thorough bleeding due to the electric pump. Then pulled the return line from last injector and he tried to start. Put it back on, started up, a bit uneven then got its groove on. Now seems better than before, like the leak was cutting back on power.

This thing is great, it will cut a 6 foot swath thru knee high grass at 15 mph.
Attached Thumbnails
Click image for larger version

Name:	68B668EA-8206-419C-9764-55EAF31553A8.jpeg
Views:	150
Size:	128.2 KB
ID:	216138   Click image for larger version

Name:	400392E0-ED89-4C9D-BB37-73C067B844CA.jpg
Views:	54
Size:	424.6 KB
ID:	216139  

__________________
John Churchill Ocala, FL
NURDLE, 1979 Bristol 35.5 CB
Currently hauled out ashore Summerfield FL for refit
sanibel sailor is offline   Reply With Quote
Old 29-05-2020, 16:04   #12
Moderator and Certifiable Refitter
 
Wotname's Avatar

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 20,242
Re: Yanmar fuel bleeding question

Thanks for the update, glad it you got it sorted without any serious issue.
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is online now   Reply With Quote
Old 29-05-2020, 17:05   #13
Registered User

Join Date: Nov 2017
Location: Portland, Oregon USA
Boat: Island Packet, Packet Cat 35
Posts: 943
Re: Yanmar fuel bleeding question

Congrats. It's a good feeling when all is well.

Fyi. Just crack the bleedscrew next time. If you gave fuel to t hff e ho pump it almost always takes care if the route to the inkectors. Cracking is less mess.
Cpt Mark is offline   Reply With Quote
Reply

Tags
fuel, yanmar

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Westerbeke bleeding the fuel lines Moparots Engines and Propulsion Systems 19 21-03-2023 10:24
Difficulty bleeding CAV DPA fuel injection pump sanibel sailor Engines and Propulsion Systems 6 01-09-2014 08:54
ford lehman 80 bleeding fuel system jpmccros Engines and Propulsion Systems 6 06-01-2014 14:20
In-Line Electric Fuel Pump for Bleeding? mestrezat Engines and Propulsion Systems 18 07-08-2012 04:27
Relearning - Fuel System Bleeding Ex-Calif Engines and Propulsion Systems 3 28-11-2009 20:39

Advertise Here


All times are GMT -7. The time now is 04:49.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.