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Author Topic:   2001 Yamaha F100: Water in Oil

bdawg5219 posted 03-03-2010 02:43 PM ET (US)
[A]fter winterizing my friend's 2001 Yamaha F100, [I] noticed water in the oil. [I]suspect an O-ring or gasket of some sort has let go.
weekendwarrior posted 03-03-2010 04:47 PM ET (US)
Common causes are leaking head gasgets or cracked head or block near a water jacket. Try a compression or leak down test first. If you have a leaky head gasket then that will likely show it in the form of low compression on one cylinder (or high percentage of leak for the leak down test).
bdawg5219 posted 03-06-2010 05:06 PM ET (US)
[T]hank you. [I] will get back to you when the engine comes out of storage.
jimh posted 03-06-2010 05:49 PM ET (US)
What oil are you describing with water contamination? Is the crankcase lubricating oil contaminated with water? Or, is the gear case lubricant contaminated with water?
weekendwarrior posted 03-07-2010 08:56 AM ET (US)
Great point! I don't know why I assumed you meant engine oil. If you are talking about lower unit oil then don't bother with any of what I said above.
bdawg5219 posted 03-07-2010 10:34 AM ET (US)
[Y]ou were right. [I] was referring to engine oil [i.e.engine crankcase lubrication oil, not gear case lubrication oil].
jimh posted 03-07-2010 11:11 AM ET (US)
Water contamination of the engine crankcase lubrication oil could be from condensation. Run the engine until it reaches operating temperature, then maintain running at operating temperature for a reasonable amount of time to allow the engine engine to warm up. This should drive off any water in the oil that accumulated from condensation.
Water contamination of the engine crankcase lubrication oil could also be from a breech or failure in the cooling system which has allowed cooling water to migrate into areas of the engine block where it should not be. As mentioned and as speculated, this could be due to a failure of a seal. This contamination would be persistent and not driven off by running at full operating temperature.
95Outrage17 posted 03-08-2010 10:41 AM ET (US)
While likely (and hopefully) not the problem with your friend's Yamaha F100, I have a friend who bought a Whaler a few years ago with a 2001 F100 on the transom. A couple months later the motor started running oddly at cruising speed. After some investigation it was discovered that the motor had corrosion on the head gasket face of the cylinder head between a water passage and the bottom cylinder. They ended up replacing the motor with a newer Yamaha F90 EFI. My friend repaired the F100 on his own and later sold it in running condition.
As I said, I hope this is not the problem with your friend's F100. As the problem became worse, it was apparent there was water in the lower cylinder by removing the spark plug and inspecting the plug and the inside of the cylinder. The engine oil was also contaminated with water.
Has your friend had any operational problems with the engine, such as sudden lack of power or poor running? Are you sure it's water in the oil and not fuel?
- Chris
bdawg5219 posted 03-08-2010 04:33 PM ET (US)
[Here I have edited the article in order to bring it into compliance with these simple rules of capitalization, viz., the first letter of the first word of each sentence, proper nouns, and the personal pronoun "I" should all be capitalized. These simple rules have governed English writing for centuries.--jimh]
[T]he engine was brought out of two year's storage, then used in saltwater for half of last season. [W]e ran it a while. [I] actually went to the store to buy the engine oil while he ran it. [I] was loosening the drainbolt. [Y]ou could actually see the freshwater drain out before the oil drained out. [T]he fresh water came from the hose in which the engine ran to get the cooling water. [T]here were not any running problems. [A]fter taking the engine out of storage [I] had to clean and synchronize the carburetors, but [the engine] still ran beautifully. [I] almost suspected water in oil when [I] checked oil in engine before running. [A]fter seeing almost a half-cup drain out before the oil, [I] am sure now. [T]hanks for your input and help.
weekendwarrior posted 03-08-2010 05:16 PM ET (US)
It sounds like you've got a leak somewhere most likely. Check out the spark plugs; if one looks shiny and new and the others look used, then suspect the cylinder with the clean plug. Hot water is fantastic for removing carbon.
Tohsgib posted 03-08-2010 08:20 PM ET (US)
Half cup of water--should not be hard to locate the culprit on that.
bdawg5219 posted 03-09-2010 04:30 PM ET (US)
[Here I have edited the article in order to bring it into compliance with these simple rules of capitalization, viz., the first letter of the first word of each sentence, proper nouns, and the personal pronoun "I" should all be capitalized. These simple rules have governed English writing for centuries.--jimh]
[Y]es, should be when we take it out of storage. [I] believe the gasket or O-ring has failed. [J]ust looking for input for when we take engine out of storage
bdawg5219 posted 03-09-2010 05:25 PM ET (US)
[I][']m guessing blown head gasket.
bdawg5219 posted 03-15-2010 04:41 PM ET (US)
Weekend warrior-when u advise to look @ the plugs; if one was clean what would cause this symptom?
weekendwarrior posted 03-16-2010 04:36 PM ET (US)
Hot water will clean a cylinder, piston and plug very clean, especially if it is run for any length of time with a leak.
bdawg5219 posted 03-17-2010 07:30 AM ET (US)
If there is a clean plug will I know the head gasket is leaking there? Is that what is meant by checking the plugs for a clean one?
jimh posted 03-17-2010 08:04 AM ET (US)
If a combustion chamber has a leak which allows water to enter, the water will tend to clean the combustion chamber via steam cleaning. As a result the spark plug electrode area will often be very clean, and it will not show the usual dark or oil contamination seen on the other plugs. The presence of a spark plug with such a clean appearance is often taken as an indication that water has been getting in the combustion chamber.
bdawg5219 posted 03-17-2010 10:31 AM ET (US)
Thanks. I am wondering what causes this? Leaking head gasket?
weekendwarrior posted 03-17-2010 02:32 PM ET (US)
Water can get in there a few different ways. The most common is probably a leaky head gasget, though a cracked cylinder or head could do the same. A clean plug will basically just tell you that there is a problem related to that cylinder and that you have reason to dig in further, it does not tell you exactly what caused the water to get in there. Let us know what you find!
BQUICK posted 03-18-2010 09:55 AM ET (US)
I've seen a few 4 strokes that were "making oil". It was due to combination of fuel and water. It was due to running in cold weather without fully warming up. One was just from running through the winter. The oil never, ever got warm enough to burn off the condensation. Add to that fuel burn was not complete thus adding some fuel into the oil. In all but one of those cases this dissappeared once warmer weather arrived. The one was a guy that insisted on going down to the boat every week and running the motor for 5 minutes or so. He argued with me saying that's what he has been doing to 30 years. Blah, blah, blah. Tried to explain how a 4 stroke with a crankcase is totally different but he wouldn't hear it.
bdawg5219 posted 03-18-2010 02:30 PM ET (US)
Thank you. I ran it for quite a bit on the hose. When I pulled the drain plug about 1/16-cup to 1/8-cup of freshwater drained first leading me to believe it is getting in through a water-jacket or the gasket itself. Will let you know within a month or so when we break her out of storage. Thanks again!
weekendwarrior posted 03-19-2010 09:46 AM ET (US)
Since you suspect a leak (I do too with that much water) now would be a great time to coat the cylinders good with fogging oil. They can rust quite a bit in a month. Remove the spark plugs and load up the cylinders with oil. Turn the flywheel 1/4 turn and do it again and repeat, then turn it around a few times to spread the oil. With rust, an ounce of prevention is worth a pound of cure.
Tohsgib posted 03-19-2010 10:16 AM ET (US)
If it is actually getting in the cylinders, I agree with the oil. It might just be getting into the oil. A VERY clean spark plug would prove that point.
fishforfun2 posted 04-07-2015 05:27 PM ET (US)
I just [five years later] had water in my oil on my 2003 Mercury FOURSTROKE. I found the thermostat was stuck open and not heating up oil enough to burn off condensation. My mechanic said [a stuck thermostat] was the first thing he was going to look at.

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Author	Topic: 2001 Yamaha F100: Water in Oil
bdawg5219	posted 03-03-2010 02:43 PM ET (US) [A]fter winterizing my friend's 2001 Yamaha F100, [I] noticed water in the oil. [I]suspect an O-ring or gasket of some sort has let go.
weekendwarrior	posted 03-03-2010 04:47 PM ET (US) Common causes are leaking head gasgets or cracked head or block near a water jacket. Try a compression or leak down test first. If you have a leaky head gasket then that will likely show it in the form of low compression on one cylinder (or high percentage of leak for the leak down test).
bdawg5219	posted 03-06-2010 05:06 PM ET (US) [T]hank you. [I] will get back to you when the engine comes out of storage.
jimh	posted 03-06-2010 05:49 PM ET (US) What oil are you describing with water contamination? Is the crankcase lubricating oil contaminated with water? Or, is the gear case lubricant contaminated with water?
weekendwarrior	posted 03-07-2010 08:56 AM ET (US) Great point! I don't know why I assumed you meant engine oil. If you are talking about lower unit oil then don't bother with any of what I said above.
bdawg5219	posted 03-07-2010 10:34 AM ET (US) [Y]ou were right. [I] was referring to engine oil [i.e.engine crankcase lubrication oil, not gear case lubrication oil].
jimh	posted 03-07-2010 11:11 AM ET (US) Water contamination of the engine crankcase lubrication oil could be from condensation. Run the engine until it reaches operating temperature, then maintain running at operating temperature for a reasonable amount of time to allow the engine engine to warm up. This should drive off any water in the oil that accumulated from condensation. Water contamination of the engine crankcase lubrication oil could also be from a breech or failure in the cooling system which has allowed cooling water to migrate into areas of the engine block where it should not be. As mentioned and as speculated, this could be due to a failure of a seal. This contamination would be persistent and not driven off by running at full operating temperature.
95Outrage17	posted 03-08-2010 10:41 AM ET (US) While likely (and hopefully) not the problem with your friend's Yamaha F100, I have a friend who bought a Whaler a few years ago with a 2001 F100 on the transom. A couple months later the motor started running oddly at cruising speed. After some investigation it was discovered that the motor had corrosion on the head gasket face of the cylinder head between a water passage and the bottom cylinder. They ended up replacing the motor with a newer Yamaha F90 EFI. My friend repaired the F100 on his own and later sold it in running condition. As I said, I hope this is not the problem with your friend's F100. As the problem became worse, it was apparent there was water in the lower cylinder by removing the spark plug and inspecting the plug and the inside of the cylinder. The engine oil was also contaminated with water. Has your friend had any operational problems with the engine, such as sudden lack of power or poor running? Are you sure it's water in the oil and not fuel? - Chris
bdawg5219	posted 03-08-2010 04:33 PM ET (US) [Here I have edited the article in order to bring it into compliance with these simple rules of capitalization, viz., the first letter of the first word of each sentence, proper nouns, and the personal pronoun "I" should all be capitalized. These simple rules have governed English writing for centuries.--jimh] [T]he engine was brought out of two year's storage, then used in saltwater for half of last season. [W]e ran it a while. [I] actually went to the store to buy the engine oil while he ran it. [I] was loosening the drainbolt. [Y]ou could actually see the freshwater drain out before the oil drained out. [T]he fresh water came from the hose in which the engine ran to get the cooling water. [T]here were not any running problems. [A]fter taking the engine out of storage [I] had to clean and synchronize the carburetors, but [the engine] still ran beautifully. [I] almost suspected water in oil when [I] checked oil in engine before running. [A]fter seeing almost a half-cup drain out before the oil, [I] am sure now. [T]hanks for your input and help.
weekendwarrior	posted 03-08-2010 05:16 PM ET (US) It sounds like you've got a leak somewhere most likely. Check out the spark plugs; if one looks shiny and new and the others look used, then suspect the cylinder with the clean plug. Hot water is fantastic for removing carbon.
Tohsgib	posted 03-08-2010 08:20 PM ET (US) Half cup of water--should not be hard to locate the culprit on that.
bdawg5219	posted 03-09-2010 04:30 PM ET (US) [Here I have edited the article in order to bring it into compliance with these simple rules of capitalization, viz., the first letter of the first word of each sentence, proper nouns, and the personal pronoun "I" should all be capitalized. These simple rules have governed English writing for centuries.--jimh] [Y]es, should be when we take it out of storage. [I] believe the gasket or O-ring has failed. [J]ust looking for input for when we take engine out of storage
bdawg5219	posted 03-09-2010 05:25 PM ET (US) [I][']m guessing blown head gasket.
bdawg5219	posted 03-15-2010 04:41 PM ET (US) Weekend warrior-when u advise to look @ the plugs; if one was clean what would cause this symptom?
weekendwarrior	posted 03-16-2010 04:36 PM ET (US) Hot water will clean a cylinder, piston and plug very clean, especially if it is run for any length of time with a leak.
bdawg5219	posted 03-17-2010 07:30 AM ET (US) If there is a clean plug will I know the head gasket is leaking there? Is that what is meant by checking the plugs for a clean one?
jimh	posted 03-17-2010 08:04 AM ET (US) If a combustion chamber has a leak which allows water to enter, the water will tend to clean the combustion chamber via steam cleaning. As a result the spark plug electrode area will often be very clean, and it will not show the usual dark or oil contamination seen on the other plugs. The presence of a spark plug with such a clean appearance is often taken as an indication that water has been getting in the combustion chamber.
bdawg5219	posted 03-17-2010 10:31 AM ET (US) Thanks. I am wondering what causes this? Leaking head gasket?
weekendwarrior	posted 03-17-2010 02:32 PM ET (US) Water can get in there a few different ways. The most common is probably a leaky head gasget, though a cracked cylinder or head could do the same. A clean plug will basically just tell you that there is a problem related to that cylinder and that you have reason to dig in further, it does not tell you exactly what caused the water to get in there. Let us know what you find!
BQUICK	posted 03-18-2010 09:55 AM ET (US) I've seen a few 4 strokes that were "making oil". It was due to combination of fuel and water. It was due to running in cold weather without fully warming up. One was just from running through the winter. The oil never, ever got warm enough to burn off the condensation. Add to that fuel burn was not complete thus adding some fuel into the oil. In all but one of those cases this dissappeared once warmer weather arrived. The one was a guy that insisted on going down to the boat every week and running the motor for 5 minutes or so. He argued with me saying that's what he has been doing to 30 years. Blah, blah, blah. Tried to explain how a 4 stroke with a crankcase is totally different but he wouldn't hear it.
bdawg5219	posted 03-18-2010 02:30 PM ET (US) Thank you. I ran it for quite a bit on the hose. When I pulled the drain plug about 1/16-cup to 1/8-cup of freshwater drained first leading me to believe it is getting in through a water-jacket or the gasket itself. Will let you know within a month or so when we break her out of storage. Thanks again!
weekendwarrior	posted 03-19-2010 09:46 AM ET (US) Since you suspect a leak (I do too with that much water) now would be a great time to coat the cylinders good with fogging oil. They can rust quite a bit in a month. Remove the spark plugs and load up the cylinders with oil. Turn the flywheel 1/4 turn and do it again and repeat, then turn it around a few times to spread the oil. With rust, an ounce of prevention is worth a pound of cure.
Tohsgib	posted 03-19-2010 10:16 AM ET (US) If it is actually getting in the cylinders, I agree with the oil. It might just be getting into the oil. A VERY clean spark plug would prove that point.
fishforfun2	posted 04-07-2015 05:27 PM ET (US) I just [five years later] had water in my oil on my 2003 Mercury FOURSTROKE. I found the thermostat was stuck open and not heating up oil enough to burn off condensation. My mechanic said [a stuck thermostat] was the first thing he was going to look at.