Reply
 
Thread Tools Search this Thread
 
Old 09 May 2007, 08:37   #1
Member
 
Simon B's Avatar
 
Country: UK - England
Town: Leicester
Boat name: Vixen
Make: Ribcraft
Length: 6m +
Engine: Suzuki OB 175
MMSI: 235071839
Join Date: Jun 2004
Posts: 1,621
Emulsified Oil

Not sure how serious this is or exactly what it points (though I do have an idea)

The engine oil in our Yam F100A 4 stroke (carb) has emulsified it's been changed and after a run up shows signs of the same again.

Has anyone else had this problem?
__________________

__________________
New boat is here, very happy!
Simon
www.luec.org
Simon B is offline   Reply With Quote
Old 09 May 2007, 10:13   #2
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Deson't sound too clever - obviously water in the oil. On most engines it would indicate head gasket failiure but maybe different on an outboard?

It could be serious condensation problems - maybe caused by the engine running too cold? If you take a sample of the oil and let it sperate out check if the water is salt or fresh - you can either taste it or measure it's boiling point or even evaporate it and see if there are salt crystal left.
__________________

__________________
codprawn is offline   Reply With Quote
Old 09 May 2007, 11:38   #3
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
Milky oil...

Could be water, as Cod says. If it's water, I'd suspect a head gasket.

Could also be fuel getting mixed in. Take a sniff and see if it smells like gas. If it does you've got the condition known familiarly as "making oil". Don't know about the F100, but the F115 is very prone to this (fishermen who troll a lot report this pretty often.) The short version is that unburned fuel gets to the crankcase, condenses, and mixes with the oil. Short term solution is a hotter spark plug and less running at low rpms.

jky
__________________
jyasaki is offline   Reply With Quote
Old 09 May 2007, 14:13   #4
Member
 
Simon B's Avatar
 
Country: UK - England
Town: Leicester
Boat name: Vixen
Make: Ribcraft
Length: 6m +
Engine: Suzuki OB 175
MMSI: 235071839
Join Date: Jun 2004
Posts: 1,621
Cheers JKY,

We're going to run some flushing oil through, it's had one change already, it's happened quite quickly since the last change and during the last trip out it miss fired a number of times but appeared to clear. I put it down to some crappy fuel as it appeared to disappear when we changed tanks. I'll wait a bit before I get morosely depressed. The reports were of strings or spirals of the emulsified stuff forming soon after the new change.
__________________
New boat is here, very happy!
Simon
www.luec.org
Simon B is offline   Reply With Quote
Old 10 May 2007, 07:47   #5
RIBnet supporter
 
Country: UK - England
Town: Over there ---->
Length: 3m +
Join Date: Jan 2007
Posts: 240
Check your plugs too - if the head gasket's gone big style, or the head / block are cracked and cooling water's getting into the barrels the plugs will appear 'jet-washed'.
__________________
I don't have an attitude, I have a personality you can't handle.
Sixy_the_red is offline   Reply With Quote
Old 11 May 2007, 02:12   #6
Member
 
Country: UK - England
Town: Herne Bay
Boat name: Rotary Rescue
Make: Pacific 22
Length: 6m +
Engine: Mermaid 160
MMSI: 235021725
Join Date: Nov 2003
Posts: 328
oil probs

Quote:
Originally Posted by Sixy_the_red View Post
Check your plugs too - if the head gasket's gone big style, or the head / block are cracked and cooling water's getting into the barrels the plugs will appear 'jet-washed'.
Could also be adaptor plate gasket/ water pipe seal at the base of the powerhead.
Paul
__________________
Paul F is offline   Reply With Quote
Old 11 May 2007, 02:40   #7
Member
 
Simon B's Avatar
 
Country: UK - England
Town: Leicester
Boat name: Vixen
Make: Ribcraft
Length: 6m +
Engine: Suzuki OB 175
MMSI: 235071839
Join Date: Jun 2004
Posts: 1,621
Got a sample of the oil, its a couple of days old now, however, all the "emulsification" has gone its a charcoal grey colour and reeks of fuel. It certainly doesnt look like the emulsified stuff I've taken from gearboxes at work. The chaps who drained it said that the dipstick level was very high.
__________________
New boat is here, very happy!
Simon
www.luec.org
Simon B is offline   Reply With Quote
Old 11 May 2007, 03:27   #8
RIBnet supporter
 
Country: UK - England
Town: Over there ---->
Length: 3m +
Join Date: Jan 2007
Posts: 240
Quote:
Originally Posted by Simon B View Post
Got a sample of the oil, its a couple of days old now, however, all the "emulsification" has gone its a charcoal grey colour and reeks of fuel. It certainly doesnt look like the emulsified stuff I've taken from gearboxes at work. The chaps who drained it said that the dipstick level was very high.
Sounds like float needles - if they're not seating properly then the fuel pump(?) will simply push fuel past them. The bowls should have overflows but I'd guess if you're leaving the engine tilted then its likely that the fuel will drain into the engine. Fuel shouldn't cause the oil to emulsify though, unless its got dry fuel or preservative in it maybe?

(I once drained 4.5l of 'fluid' out of a 2.5l sump on a bike so you're not alone! )
__________________
I don't have an attitude, I have a personality you can't handle.
Sixy_the_red is offline   Reply With Quote
Old 11 May 2007, 11:25   #9
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
Quote:
Originally Posted by Sixy_the_red View Post
(I once drained 4.5l of 'fluid' out of a 2.5l sump on a bike so you're not alone! )
Was that the old "Fill it up 'til it overflows out the dipstick tube" trick?

jky
__________________
jyasaki is offline   Reply With Quote
Old 12 May 2007, 03:41   #10
RIBnet supporter
 
Country: UK - England
Town: Over there ---->
Length: 3m +
Join Date: Jan 2007
Posts: 240
Quote:
Originally Posted by jyasaki View Post
Was that the old "Fill it up 'til it overflows out the dipstick tube" trick?

jky

Naa, more like the 'leave it stood for too long with leaking float needles so it fills the engine up with petrol, sorry gas ' trick!
__________________
I don't have an attitude, I have a personality you can't handle.
Sixy_the_red is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 05:31.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.