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I have a 2001 (Johnson 70) same as a Suzuki 70 that is on my pontoon boat. I have noticed the oil level raising on the dip stick. I didnt think too much of it until I found my engine hydrolocked at the beginning of the year and found oil flooding cylinder #4(bottom cylinder) I changed the oil and I noticed that it has came up maybe 3/4 of a quart in a matter of a couple hours of run time (pulling tubes) . I run conventional 10w-40 oil. THe engine runs smooth as glass. The oil on the stick or drained oil is clean, Not milky from water and does not light(when trying to light with a match) or smell like fuel. I have looked over the engine and have replaced the diaphrams gaskets in the fuel pump that could likely allow fuel into the engine, I also have eliminated the idea of fuel flooding the cylinders by replacing the 4 fuel injectors with four used ones. I have done a compression test and have found all cylinders to be within 5 psi and compression was good. I was told to try a dry and wet compression test and check results, I am appreciative to any input anyone may have. please email to me sticks5346@aol.com
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Don't worry about a wet and dry compression test, check the vst and you will find that's where the the problem is. -
Thats exactly what mine was. VST line flooding back into crankcase. Stuck needle and seat. Fun work getting to it but the problem is now gone.2005 Carolina Skiff DLX 2007 Suzuki DF 115 4 StrokeComment
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Thank you
THANK you very much for the reply guys, I am excited to get it fixed!!Comment
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Yep replace the needle and seat when youve got the VST off and apart. I tried just cleaning it before i paid the 50 bucks for a new one....wish i just bought the new one from the start haha. Fixed the oil making problem though.
By memory i think the VST chamber was filling up then getting sucked into the engine via a vacuum hose that goes into tappet cover at the top?Comment
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2001 Suzuki 70 oil level raising AGAIN
Hello ALL,
After removing the VST pump and replacing the needle and seat I reassembled it, changed the oil and after two weeks of use the oil level is an inch over the full marker. Very frustrated...any other ideas??
Thank youComment
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I would verify that the fix worked by extending the line from the VST into a container and see if gas is still getting into that line. Do you have a system that could be over-pressuring the needle and seat, like an electric fuel pump?Originally posted by STICKS View PostComment
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oil in fuel still
Hello All,
Still have fuel getting into the oil..let it sit all winter and engine is hydrolocked from excessive oil in crank case. Anybody have any ideas??
Thx
Cory
sticks5346@aol.comComment
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There is only wo places fuel can get into your crankcase the vst and your low pressure fuel pump which is bolted to your cam cover.Originally posted by STICKS View PostComment
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oil in the fuel Suzuki 70
Hello,
Thank you for replying....i understand the low pressure fuel pump...if the diaphram leaks it will put fuel right into the head.....now on the vst how is that system putting fuel into oil. i did replace the needlea and seat in case reservoir is over filling and running into engine somehow
Please reply I appreciate your wisdom
Thanks
CoryComment
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The only way fuel could get into your crankcase,is either through a ruptured diaphragm on the low pressure fuel pump, or the needle and seat is not holding its level filling up the vst, and traveling up up the vapour line. If you pull the vapour line off the top of the vst while running and fuel comes out that is where your problem is, If it is not coming out there remove the fuel pump and reconnect it up and pressurise it and see if any fuel leaks from the diaphragm. Is your fuel tank higher than your motor.Comment
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Oil level increasing on suzuki 70-help!
Just be carefull , I Tried blow a line with some fuel in it with a compressor and blew the pump apart
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if the float for the needle valve is not correctly positioned the excess fuel goes through the overflow hose directly to the engineComment
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