20 years without knowing, So I thought I'd ask. - 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 new forum dedicated to diesel engines and their applicable accessories.


Like Tree1Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 11-11-2011
dockbumdan's Avatar
dockbum
 
Join Date: Feb 2011
Location: Georgetown, MD
Posts: 42
Thanks: 2
Thanked 1 Time in 1 Post
Rep Power: 0
dockbumdan is on a distinguished road
20 years without knowing, So I thought I'd ask.

Ok, for the past 20 years I've had the same boat, I've put well over 3000 hrs on the engine with several thousand miles under it's belt. So now I have to know.
It's engine is a Yanmar 3GMD. after starting the engine I normally turn off the key, and remove it. Placing it back in its normal location (storage). Now, suddenly I've started to leave the key in the On position, then only remove it after I've choked it off. Any idea if either method is right/wrong? Obviously I havent caused any damage doing it the first way, start, key off/remove, choke off. but should it be left On during the engine running?
__________________
DockbumDan
SV/Trinity
Sailing Associates
Slip W=11
Georgetown, Md.21930
Sassafras River, Md.

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


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #2  
Old 11-11-2011
Senior Member
 
Join Date: Nov 2002
Location: New York
Posts: 5,401
Thanks: 0
Thanked 14 Times in 14 Posts
Rep Power: 14
bubb2 has a spectacular aura about bubb2 has a spectacular aura about bubb2 has a spectacular aura about
I know if I remove my key while it's runing it also turns off my hour meter and over temp alarm.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Never Forgotten

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #3  
Old 11-11-2011
emoney's Avatar
Senior Member
 
Join Date: Jun 2010
Posts: 545
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 5
emoney is on a distinguished road
A lot has to do with how your ignition switch is wired. If I turn my key off, it's wired in a way, like bubb's, that my gauges no longer operate. So, how's yours wired?
Reply With Quote Share with Facebook
  #4  
Old 11-11-2011
Don Radcliffe
 
Join Date: May 2007
Location: Santa Cruz
Posts: 396
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
donradclife is on a distinguished road
Some are wired so that your alternator will not work either.
Reply With Quote Share with Facebook
  #5  
Old 11-11-2011
Jeff_H's Avatar
Moderator
 
Join Date: Feb 2000
Location: Annapolis, Md
Posts: 6,538
Thanks: 5
Thanked 85 Times in 65 Posts
Rep Power: 10
Jeff_H has a spectacular aura about Jeff_H has a spectacular aura about Jeff_H has a spectacular aura about
And some are wired so that turning off the key can damage the alternator coils.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay and part-time purveyor of marine supplies
Reply With Quote Share with Facebook
  #6  
Old 11-11-2011
dockbumdan's Avatar
dockbum
 
Join Date: Feb 2011
Location: Georgetown, MD
Posts: 42
Thanks: 2
Thanked 1 Time in 1 Post
Rep Power: 0
dockbumdan is on a distinguished road
I heard that also, but in 20 years the alternator coils have never suffered, But it does seem to turn off the alarm, at least for the first 2 seconds or so, then the temp goes out (normal). after that first start up alarm, the switch being on or off doesn't seem to matter.
like I said earlier, might be why the engine hour meter never moves. Haha
__________________
DockbumDan
SV/Trinity
Sailing Associates
Slip W=11
Georgetown, Md.21930
Sassafras River, Md.

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


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #7  
Old 11-11-2011
davidpm's Avatar
Senior Member
 
Join Date: Oct 2007
Location: Madison
Posts: 3,650
Thanks: 160
Thanked 36 Times in 29 Posts
Rep Power: 7
davidpm is on a distinguished road
This is from the manual:
http://j30.us/files/yanmar-manual.pdf

It does not seem to address your point exactly but the last line indicates that the starter switch is turned off after the engine is stopped with engine kill knob.
But since they don't make a fuss about it either way and it has worked both ways for you maybe it doesn't matter much.



[7-4.] Stopping
1) Stopping procedure
1a) Place the clutch handle in the "neutral" position and
idle the engine for about 5 minutes.
Important
If the engine is stopped suddenly
while at a high temperature, the temperature
of various parts will increase.
This may result in engine trouble.
1-b)
After five minutes' idling, place the speed control lever
in the "full" position and raise the rpms to about 3600 to
blow out any burnt gas in the cylinder.
1-c)
Set the engine to the lowest speed (about 850-900 rpm), cut the fuel, and stop the engine.
1. Engine stops if knob is pulled
2. Engine stop cable
Important
Do not stop the engine with the decompression lever. If the decompression
lever used to stop the engine, fuel will spray out and accumulate on top of
the pistons. This will create the danger of an explosion the next time the
engine is started.
2) Be sure to close the kingston **** after stopping.
3) Drain out the cooling water. In winter and in periods of col
d weather when there is the possibility that the cooling water may freeze, the cooling water
should be drained out after use.
3-a)
Open up the cylinder body side **** located below the intake silencer and drain out the water
in the cylinder.
3-b)
Open up the **** in the lower part of the exhaust manifold and drain the water from the
manifold. (for 3GMD, 3HM)
3-c)
Turn the crankshaft 2-3 times by starter motor to remove any water remaining in the cooling
pump.
4) While the engine is still warm, wipe off any dirt and grime that has accumulated.
5) Turn off the battery switch.
Note
When stopping the engine with the starter switch "ON", the tube oil pressure warning buzzer
will sound. This does not indicate engine trouble.
Reply With Quote Share with Facebook
  #8  
Old 11-11-2011
Senior Member
 
Join Date: Oct 2011
Location: Victoria b.c.
Posts: 1,541
Thanks: 2
Thanked 18 Times in 18 Posts
Rep Power: 3
Capt Len is on a distinguished road
It's possible your alt gets it's energy thru an oil pressure switch But I think that a good look around should help you understand what you got and that can't be bad.
Reply With Quote Share with Facebook
  #9  
Old 11-13-2011
Member
 
Join Date: Jun 2011
Posts: 76
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
ggray is on a distinguished road
Quote:
Originally Posted by dockbumdan View Post
But it does seem to turn off the alarm, at least for the first 2 seconds or so, then the temp goes out (normal). after that first start up alarm, the switch being on or off doesn't seem to matter.
Unless I misunderstand all what you are saying here, how would you know that being on or off doesn't matter unless you experienced an over heated engine and then tested the switch to see if it mattered? Sounds to me like you have been lucky.

Water temp is the difficult sensor to test. You would need to put it in hot water measured with a thermometer. Oil pressure is easy: it should be silent while running, but sound when the engine is shut down. If your alarm is silent after your engine is shut down, then you have been lucky, so far.

If you have mechanical gauges, not quite so serious, but idiot lights and especially alarms are very helpful.
Reply With Quote Share with Facebook
  #10  
Old 11-13-2011
Senior Member
 
Join Date: Jul 2007
Location: Truckee, CA
Posts: 6,895
Thanks: 2
Thanked 100 Times in 98 Posts
Rep Power: 8
dabnis is on a distinguished road
Dock,

What is the downside of leaving the key on?

Dabnis
Reply With Quote Share with Facebook
Reply


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
Good Years and Bad Years MooreVOLS Boat Review and Purchase Forum 7 08-26-2010 11:04 AM
your boat for 2 years, my house for 2 years wantogonow Cruising & Liveaboard Forum 0 08-27-2009 04:42 PM


All times are GMT -4. The time now is 08:49 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.