Yanmar 2QM15 Decompression Lever? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 06-23-2012
Junior Member
 
Join Date: May 2012
Posts: 13
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Aprisa SJ 28 is on a distinguished road
Yanmar 2QM15 Decompression Lever?

So I have looked for the reason for the decompression lever on the Yanmar, and the previous owner disconnected the pull cable. What is the reason to use the decom lever and what is the proper use of it? I have heard everything from purging water to helping start the motor...the owners manual doesn't help much either...any experts out there? I'm new at this!
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 06-23-2012
Senior Member
 
Join Date: Feb 2005
Posts: 1,077
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 10
sawingknots is on a distinguished road
Re: Yanmar 2QM15 Decompression Lever?

because diesel engines have a lot of compression its easier on the starter and battery to get the engine spinning freely [heavy flywheel]then release the decompression lever for the engine start
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 06-23-2012
marcusc130's Avatar
Senior Member
 
Join Date: Oct 2011
Location: Jamestown, RI
Posts: 112
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 4
marcusc130 is on a distinguished road
Yanmar 2QM15 Decompression Lever?

You also need to use it to hand crank the engine. If your battery I too weak to turn over the engine, you can open the decomp. lever, spin the engine up, then close it to start the engine.
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 06-23-2012
Junior Member
 
Join Date: May 2012
Posts: 13
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Aprisa SJ 28 is on a distinguished road
Re: Yanmar 2QM15 Decompression Lever?

Thanks guys...makes sense!
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 06-23-2012
Senior Member
 
Join Date: Jan 2011
Posts: 702
Thanks: 0
Thanked 18 Times in 18 Posts
Rep Power: 4
Frogwatch is on a distinguished road
Re: Yanmar 2QM15 Decompression Lever?

If your battery is weak or it is a very cold morning, open the decomp lever and get her spinning and then close it and she should start.
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 06-23-2012
Senior Member
 
Join Date: May 2012
Location: Lund British Columbia
Posts: 124
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 3
Bob142 is on a distinguished road
Re: Yanmar 2QM15 Decompression Lever?

The thing about purging water applys more to larger engines...If you have a jacket water leak it can fill the combustion chamber...Water doesn't compress well and when the piston can't go up any more you can damage other components..
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

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:

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

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Yanmar 2GM or 2QM15...? marinesniper Gear & Maintenance 20 03-10-2012 01:47 AM
Yanmar 2QM15 sundownersc Diesel 11 02-09-2012 10:21 AM
Yanmar 2QM15 repairtime Gear & Maintenance 7 12-09-2011 05:40 AM
Yanmar 2QM15 Zinc(s) backcreeksailor Gear & Maintenance 9 05-30-2009 08:48 AM
Yanmar 2QM15 rpowell Gear & Maintenance 3 01-10-2002 09:26 PM


All times are GMT -4. The time now is 02:53 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.