Yanmar 3gmd Max RPM - Page 2 - 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 > Engines > Diesel
 Not a Member? 

Diesel This is a forum dedicated to diesel engines and their applicable accessories.


Reply
 
LinkBack Thread Tools
  #11  
Old 10-18-2010
casey1999's Avatar
Senior Member
 
Join Date: Oct 2010
Location: HI
Posts: 2,984
Thanks: 10
Thanked 31 Times in 30 Posts
Rep Power: 5
casey1999 is on a distinguished road
Prop is 14 inch 3 blade. If it is over propped can the existing prop be trimmed down?
Reply With Quote Quick reply to this message Share with Facebook
  #12  
Old 10-18-2010
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,224
Thanks: 0
Thanked 73 Times in 64 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
They can easily reduce the pitch. I think you're stuck with diameter though.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Quick reply to this message Share with Facebook
  #13  
Old 10-18-2010
JohnRPollard's Avatar
Moderator
 
Join Date: Mar 2007
Location: Chesapeake
Posts: 5,680
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 10
JohnRPollard is a jewel in the rough JohnRPollard is a jewel in the rough JohnRPollard is a jewel in the rough
Quote:
Originally Posted by casey1999 View Post
Prop is 14 inch 3 blade. If it is over propped can the existing prop be trimmed down?
As mitiempo mentioned, you'd usually start by having the pitch reduced on the existing prop. If it turns out the diameter is too large, you might need to downsize (but 14" doesn't sound too large).

Michigan Wheel is a good resource for learning about prop sizing and pitch.

First things first, though. Test the RPMs in neutral. Hopefully you'll crank right up to 3200 +.
__________________

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

Pacific Seacraft Crealock 31 #62

NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT
Reply With Quote Quick reply to this message Share with Facebook
  #14  
Old 10-18-2010
Maine Sail's Avatar
Senior Member
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,486
Thanks: 12
Thanked 138 Times in 106 Posts
Rep Power: 15
Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice
1- Confirm the engine will run to 3600 RPM in neutral (I believe this is the "one hour" load RPM for the 3GM)

2- Confirm with a photo tach that the tachometer is reading correctly

3- Make sure your fuel filters are clean and the exhaust elbow is not restricted.

4-Confirm bottom and prop are clean

If all the above check out then the prop is most likely over-pitched. This can usually be fixed by a pitch adjustment but with a high of 2400 on an engine that should be able to hit about 3400 it may require more than just pitch adjustment. A very rough guideline is 200-300 RPM for every inch of pitch adjustment. It is unlikely you can take 3" of pitch on a prop that has possibly been re-pitched at some point in its life span.

You should be able to attain at least max continuous, which is 3400 on the 3GM, or max one hour rating, about 3600, at WOT with a clean bottom and prop.
__________________
______
-Maine Sail / CS-36T


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




© Images In Posts Property of Compass Marine Inc.



Last edited by Maine Sail; 10-18-2010 at 06:09 PM.
Reply With Quote Quick reply to this message Share with Facebook
  #15  
Old 10-22-2010
Senior Member
 
Join Date: Jul 2008
Location: 34.25n 119.27w
Posts: 403
Thanks: 1
Thanked 4 Times in 3 Posts
Rep Power: 7
SJ34 is on a distinguished road
Quote:
Originally Posted by casey1999 View Post
I will check max rpm in netral and let you know. It will be a few days till I get back to the boat. Could white / grey smoke be unburned fuel from bad fuel injectors? would bad fuel injectors lead to below spec horse power output?
Thanks, Casey
White or gray smoke is engine oil, either past worn piston rings or valve seals. Unburned diesel fuel is black. If the engine doesn't use any oil you may be seeing steam in the exhaust, another symptom of being over-propped.

A bad injector would have much more noticeable symptoms besides not being able to reach max rpm.
Reply With Quote Quick reply to this message Share with Facebook
  #16  
Old 10-22-2010
casey1999's Avatar
Senior Member
 
Join Date: Oct 2010
Location: HI
Posts: 2,984
Thanks: 10
Thanked 31 Times in 30 Posts
Rep Power: 5
casey1999 is on a distinguished road
Quote:
Originally Posted by SJ34 View Post
White or gray smoke is engine oil, either past worn piston rings or valve seals. Unburned diesel fuel is black. If the engine doesn't use any oil you may be seeing steam in the exhaust, another symptom of being over-propped.

A bad injector would have much more noticeable symptoms besides not being able to reach max rpm.
I think you could be right on the white smoke being steam. I am going through the engine (it is 30 years old and problably not gotten the best maintinance). Engine anodes with total corroded away, the thermostat was very corroded and blocked. There may be water passages that are blocked. I will attempt to clean the water passages (engine is direct sea water cooled). I will also try a vinegar flush to see if that helps. I am also going to try Stanadyne Performance diesel additive to see if that helps to clean the injectors and lubricate plus add some cetane.
Thanks, Casey
Reply With Quote Quick reply to this message Share with Facebook
  #17  
Old 11-01-2010
casey1999's Avatar
Senior Member
 
Join Date: Oct 2010
Location: HI
Posts: 2,984
Thanks: 10
Thanked 31 Times in 30 Posts
Rep Power: 5
casey1999 is on a distinguished road
Ran the engine in neutral at the dock and got up to about 2700 rpm. Engine seems to be running good. The max rpm in neutral seems about the same as rpm in forward gear. I am going by the yanmar gage tach (have not had a chance to verify with another tack). Exhaust color seems normal at all rpm. For now seems ok. Engine will produce power I need at 2700 rpm- will verify with a tach. Did notice no fuel comes out of the fuel injector fuel return line to the tank. Lift pump is new as are all filters. Return fuel line is clear. Could it be that injector pump is not putting out maximum fuel and therefore limiting the rpm? Injector pump is original 30 years old.

A problem I have is trying to get the the two zinc anode plugs out of the engine block. I got the one in the head out with dificulty, but I am starting to round off the other zinc plugs with the socket wrench. I tried PB blaster penetrante oil with no success. The plugs have probably not been removed for 20 years. Probably heavy corrosion. I am a little afraid I migh damage the block by taking extreme measures to get the anode plugs out- Any ideas?
Thanks
Reply With Quote Quick reply to this message Share with Facebook
  #18  
Old 11-01-2010
Blitz - 34'Seidelmann
 
Join Date: Jun 2007
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
kolbn is on a distinguished road
Zincs: Had the same problem years ago with mine. Never got the one out of the head flange - just changed out the whole flange. The two in the side of the block are hard to get to since behind the yanmar fuel filter and the fuel pump. I always make it a point to remove and check them when I replace the fuel filter and only use the proper sized socket (think it's 23 or 24 mm) with a breaker bar for leverage. Also, keep trying with the PB Blaster or Freeze-out. If this all don't work, you can try an impact gun - they have electric ones that are large but work in a pinch if you have the room.

When reinstalling, use never-seize type grease (at auto stores) to help for the next time you need to take them out.

Let us know how you make out.
Reply With Quote Quick reply to this message Share with Facebook
  #19  
Old 11-05-2010
casey1999's Avatar
Senior Member
 
Join Date: Oct 2010
Location: HI
Posts: 2,984
Thanks: 10
Thanked 31 Times in 30 Posts
Rep Power: 5
casey1999 is on a distinguished road
I tried everything to get the anode out of the block- nothing worked. I tried Freeze out and did not help. The head is so rounded I think it will have to be drilled out.
Reply With Quote Quick reply to this message Share with Facebook
  #20  
Old 11-06-2010
Senior Member
 
Join Date: Aug 2007
Location: NY
Posts: 2,245
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 8
sck5 is on a distinguished road
the tach on my 3gm was completely worthless - i replaced it but wouldnt rely on it for testing. use one of those photo tachs to make sure you are reading what it is really doing
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 3GMD transmission oil confusion in manuals mbsl98 Diesel 32 06-08-2014 06:59 PM
Yanmar 3GMD Timing happyman Diesel 1 11-22-2009 04:48 PM
Yanmar 2GM zfactor Boat Review and Purchase Forum 5 06-08-2009 11:00 AM
$7,500.00 for a new Yanmar??? deniseO30 Gear & Maintenance 15 07-10-2008 12:40 AM
Yanmar 3gmd Question nk235 Gear & Maintenance 4 03-12-2008 05:48 PM


All times are GMT -4. The time now is 12:23 PM.

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.