Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 23-04-2010, 21:33   #1
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Nevada City. CA
Boat: Sceptre 41
Posts: 3,745
Images: 9
Disappearing Oil

Here's the problem. I have a Yanmar 4JH4E with 630 hours on it. Oil changes have been done as scheduled. Originally I overfilled it with oil. I did not realize that if the engine was set at 8 degrees off of level you were supposed to underfill the engine by a half liter. There seems to be a problem with disappearing oil. I'll fill it with four liters of oil, the dipstick reads midway between full and add, then run the engine for half an hour and check the oil. When I check there is sometimes no oil and sometimes only enough to get the dipstick wet and sometimes it is at the add level. I try to make sure that the suction caused by Yanmar dipsticks does not cause a false reading. I add a liter of oil and it gets up to the add mark. I don't want to add anymore. I have a clean oil diaper under the engine and it is still clean after running the engine. I checked the exhaust and there is no oily residue. Where has the oil disappeared too? Any Ideas? I am a week late departing for the Baja Bash and now have to decide whether to do it or not.
__________________

__________________
Fair Winds,

Charlie

Between us there was, as I have already said somewhere, the bond of the sea. Besides holding our hearts together through long periods of separation, it had the effect of making us tolerant of each other's yarns -- and even convictions. Heart of Darkness
Joseph Conrad
Charlie is offline   Reply With Quote
Old 23-04-2010, 23:54   #2
Moderator
 
Boracay's Avatar

Cruisers Forum Supporter

Join Date: Feb 2004
Location: Pelican Bay, Great Sandy National Park
Boat: Steel Roberts Offshore 44
Posts: 5,175
Images: 18
Manual?

Your manual should give you the dipstick adjustments for engine angle. Mine (John Deere) is in the form of a graph. Get a level, a batten and a protractor and work out what your engine down angle is. It may be helpful to use some cardboard and scissors to make a wedge shaped template.

While the engine is running the oil splashes up and through the engine. It may take a few minutes to run back down to the sump, especially if it is cold. Look at your manual again for the correct way to check the oil level and for the amount of oil your engine needs.

The manual may be available online at the Yanmar site.

If you have fitted a new filter this will take additional oil.

I do think that it is wise to be concerned at this stage.

Don't forget to check your gearbox oil as well.
__________________

__________________
Rust never sleeps
Boracay Blog.
Boracay is offline   Reply With Quote
Old 24-04-2010, 04:40   #3
Registered User

Join Date: Jun 2005
Posts: 1,901
Charlie,
How soon after shutting down do you check the oil? consider having a beer first.
__________________
never monday is offline   Reply With Quote
Old 24-04-2010, 04:49   #4
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29 49.16 N 82 25.82 W
Boat: Pearson 422
Posts: 12,382
Is this happening only after you change the oil and filter? If so, do you (if possible and your engine is not one with the oil filter mounted horizontally) fill the new filter with oil before installing it on the engine? If you can should do so for two reasons.

One, it is where about 1/2 Liter of oil goes when you first crank the engine.

Second, while the engine is pumping that 1/2 Liter into the empty filter you are taking longer to build oil pressure and adding wear to the engine and bearings while that happens.

Some other questions, what does the manual say is the total oil capacity of the engine? Is it the 4 Liters you add or are you adding based on dipstick level only? Are you sure you are getting all the old oil out when you change? A little too much in normal circumstances but in your case if you can't find an obvious answer I would check the dipstick before changing to make sure it's full and measure how much comes out to make sure you haven't left some in the block.
__________________
The water is always bluer on the other side of the ocean.
skipmac is online now   Reply With Quote
Old 24-04-2010, 07:44   #5
Registered User
 
Inthewind's Avatar

Join Date: Mar 2007
Location: Charlotte harbor, FL
Boat: Morgan OI 414
Posts: 251
With some Yanmars, you will get a false reading when you first pull the dip stick. Pull the dip stick and ignore the first reading, then wipe it clean and check it again.
__________________
Inthewind is offline   Reply With Quote
Old 24-04-2010, 07:49   #6
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Nevada City. CA
Boat: Sceptre 41
Posts: 3,745
Images: 9
Quote:
Originally Posted by never monday View Post
Charlie,
How soon after shutting down do you check the oil? consider having a beer first.
After shutting down the engine I wait for about five minutes. If I don't the oil shows all the way up and over the high mark on the dipstick.

Quote:
Originally Posted by skipmac View Post
Is this happening only after you change the oil and filter? If so, do you (if possible and your engine is not one with the oil filter mounted horizontally) fill the new filter with oil before installing it on the engine? If you can should do so for two reasons.

One, it is where about 1/2 Liter of oil goes when you first crank the engine.

Second, while the engine is pumping that 1/2 Liter into the empty filter you are taking longer to build oil pressure and adding wear to the engine and bearings while that happens.

Some other questions, what does the manual say is the total oil capacity of the engine? Is it the 4 Liters you add or are you adding based on dipstick level only? Are you sure you are getting all the old oil out when you change? A little too much in normal circumstances but in your case if you can't find an obvious answer I would check the dipstick before changing to make sure it's full and measure how much comes out to make sure you haven't left some in the block.
The engine does have the horizontal filter. I fill it about 3/4 full and then put it on. I expect to lose some height on the dipstick but not that much.

Quote:
Originally Posted by Inthewind View Post
With some Yanmars, you will get a false reading when you first pull the dip stick. Pull the dip stick and ignore the first reading, then wipe it clean and check it again.
Thanks that is a tricky one but I do as Chief Engineer suggests and pull the dipstick out far enough to break the suction and then lower it back in.
__________________

__________________
Fair Winds,

Charlie

Between us there was, as I have already said somewhere, the bond of the sea. Besides holding our hearts together through long periods of separation, it had the effect of making us tolerant of each other's yarns -- and even convictions. Heart of Darkness
Joseph Conrad
Charlie is offline   Reply With Quote
Reply

Tags
oil

Thread Tools
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
photo link disappearing Tropic Cat Forum Tech Support & Site Help 10 28-08-2008 09:07
Mystery of the Disappearing Lake GordMay Off Topic Forum 5 05-07-2007 13:35



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:51.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.