yanmar 2qm 20 will not start - Page 2 - SailNet Community
Reply
 
LinkBack Thread Tools
post #11 of Old 03-07-2010
Junior Member
 
Join Date: Aug 2009
Location: West Vancouver, BC
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
my bleeding experience

Quote:
Originally Posted by wwilson View Post
Hi Rik,

No, i'm not a diesel mechanic either. I did have a very good diesel mechanic teach me how to bleed the engine though.

There is no reason to be anxious about loosening the injector (at the cylinder) no harm will be done in any case. I did not mean detach - only loosen a turn or two. The engine's cranking power and the fuel pump's effectiveness are just a whole lot more effective than the little "finger pumps" normally used. And, if the air is in the portion of the fuel line between the finger pump (near the secondary filter) and the injector, the pump has a very hard time expelling it.

Wayne
I wish I'd read this a day ago, Wayne. I had to tighten a gas line fitting at the tank this weekend because there was a leak. This introduced air, of course. I haven't bled the air from my 2QM15 before but I took a swing at it. I loosened the bleed screw on the secondary filter, and started working away with the finger pump. After about 15 odd minutes I'd run out of any strength in my fingers, and I still didn't have fuel coming out. In a bit of frustration, I just cranked the engine at half throttle and it kind of caught a bit. So I stopped, went below, and obviously fuel had been spraying. I tightened the filter bleed screw and went back up to crank. It caught almost right away, kept sputtering and spewing black smoke, then started running. It took about 1 minute for the engine to smooth out, than ran for an hour just fine!

So: I don't know why that little finger pump doesn't work. And also, I'm inclined to believe that on my engine I don't really have to worry about loosening the injectors.

Anybody have any thoughts on this? And an additional question: if I were doing this properly, would I always have to remove both injectors (two cylinders), or would just one be ok?

Final question! prior to getting to the secondary filter, I tried opening the valve at the bottom of my Raccor primary (it's an old one: think it says model 2010. Has the glass bowl attached to a housing, with the filter inside the housing) and nothing really came out except a few drops. So then I unscrewed the top of the filter cap, and it came rushing out. Is that normal: is there a vacuum in there that prohibits the flow?

Thanks for any thoughts.
30Irwin is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #12 of Old 03-08-2010
Chesapeake Sailor
 
wwilson's Avatar
 
Join Date: Jul 2000
Location: Herrington Harbor, MD
Posts: 579
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 15
 
Quote:
Originally Posted by 30Irwin View Post
So: I don't know why that little finger pump doesn't work. And also, I'm inclined to believe that on my engine I don't really have to worry about loosening the injectors.

Anybody have any thoughts on this? And an additional question: if I were doing this properly, would I always have to remove both injectors (two cylinders), or would just one be ok?

Final question! prior to getting to the secondary filter, I tried opening the valve at the bottom of my Raccor primary (it's an old one: think it says model 2010. Has the glass bowl attached to a housing, with the filter inside the housing) and nothing really came out except a few drops. So then I unscrewed the top of the filter cap, and it came rushing out. Is that normal: is there a vacuum in there that prohibits the flow?

Thanks for any thoughts.
30Irwin,

1) The finger pump works when all goes well - which it does most of the time. But in any case it is always a pain in the... index finger.

2) No only loosen one fuel connector on the injector farthest from the secondary fuel filter (on the engine). Don't remove it, we don't want to get any grit or dirt in that. Just loosen it on the threads a turn or so. That way the air can blow by and the whole fuel system gets bled.

3) Let the engine starter do the work when you give up on the finger pump. Often if the engine has stopped with the lobe not positioned properly, then the finger pump will be doing absolutely nothing - you could pump it all day.

4) With only 1 cylinder "off-line" the engine will try to start as it is cranked. A 4 or more cylinder engine will start and hobble along on its working cylinders. Holding the wrench on the fuel connector nut, pull it snug after the engine has forced out its air. This is usually a 2 person job. The engine will then start. Careful what you touch with the wrench. It can be easy to short the 12V causing a startling (usually harmless) spark.

Most people would apply common sense with this technique and NOT run their starter battery dead, or crank the starter motor so long that they fill the exhaust elbow and flood the engine and it is always good to avoid the spinning stuff on the front of the engine, hopefully you've read this far...

5) I have the same Racor: if you opened the water bleed screw (bottom) (while the engine was off) you probably need to loosen the cap on top of the unit to get fuel (and water if any) to flow out the bottom.

Wayne
s/v Virginia Dare

Last edited by wwilson; 03-08-2010 at 11:13 AM.
wwilson is offline  
Quote Quick Reply Share with Facebook
post #13 of Old 03-08-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 14 Times in 12 Posts
Rep Power: 14
         
One word of warning on fuel lines... if you overtighten the banjo bolts on a fuel like you can often cause an air leak at the banjo bolt... so be careful about tightening them.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #14 of Old 03-08-2010
Junior Member
 
Join Date: Aug 2009
Location: West Vancouver, BC
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Your feedback is extremely comforting, Wayne! Good to know I was on the right track, and thank you for the additional pointers.

I'll watch the tension on that banjo bolt, Sailingdog.

Thank you.
30Irwin is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
New Yanmar, hard to start, or just cold natured? Dockdozer Diesel 32 11-24-2009 08:39 AM
Can't start My Yanmar bun243 Gear & Maintenance 8 06-04-2006 01:22 AM
Yanmar 2gm20 won''t start Juebel Gear & Maintenance 6 05-18-2004 07:49 AM
Recovering from Bad Starts Dean Brenner Racing Articles 0 05-29-2002 08:00 PM
Adapting from the Match Race Crowd Dean Brenner Racing Articles 0 11-14-2001 07:00 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome