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Old 10 May 2004, 09:37   #1
Country: UK - England
Town: Leatherhead
Length: no boat
Join Date: Aug 2001
Posts: 907
Oil level on 4-stroke

The weekend before last (and, I'm afraid to say, for the first time since we got the boat) we checked the oil level (cold) in the sump of our Suzuki DF115 We found that the level on the dipstick was well above the "Full" mark on the dipstick We then bought one of those Vacuum Oil Removers to remove 2L of oil which bought the level down to the upper mark on the stick.

After this w/e's outing we checked the level again (hot) and found the level was up once more. During both times of checking, the engine was in the "down" position and on the trailer in the same location in the boat compound. The oil on the stick was quite clean with no signs of water in it and no signs of emulsification under the oil filler cap. Are these engines known for erratic dipstick readings or have we go an oil-producing lump ? I suppose the only real way we know how much oil is in the sump is to drain it out and put back in the required amount - 5.5L

Peter (nick, nick) T

Age and treachery will always overcome youth and skill! Bullshit and brilliance only come with age and experience.
Ribald is offline   Reply With Quote
Old 10 May 2004, 10:00   #2
Country: UK - England
Town: Preston
Boat name: Katy Blue/Banana Yuk
Make: Ribcraft / Mirror
Length: 5m +
Engine: Suzuki DF90
MMSI: 235086157
Join Date: May 2004
Posts: 58
I've got a DF90 which I think is the same basic lump.

On it's two oil changes so far, after draining the oil I've poured in a full 'normal' sized oil containers worth (presuambaly 5L, I can't remember, but definitey less than 5.5L) thinking I'd then top up with a smaller 1L bottle after checking the dipstick. On both occasions, however, this initial pour ended up significantly overfilling according to the dipstick.

Like you I've spent some time trying different tilt angles - but I couln't find one which make it look less over-full (if you see what I mean).

The obvious question for both of us is whether to go with the dipstick or the manual?

I've gone with the dipstick so far, but that's purely because I had a very bad experience with an over-filled ford escort many years ago!

Neil R is offline   Reply With Quote
Old 10 May 2004, 13:42   #3
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,851
I know nothing about your engine but I've seen sump contents increasing. Petrol pump diaphagm leaking. Petrol passes through the diaphragm and into the crankcase. You may or may not have this type of pump.
jwalker is offline   Reply With Quote
Old 10 May 2004, 16:04   #4
Country: UK - England
Town: cheshire
Boat name: Magpie
Length: 5m +
Engine: 55hp yam
Join Date: Sep 2003
Posts: 70
I will 2nd what JW says.

nickjaxe is offline   Reply With Quote
Old 10 May 2004, 16:34   #5
Country: Norway
Town: Oslo
Make: Cape 66
Length: 6m +
Engine: Johnson 140hp
Join Date: Apr 2004
Posts: 9
As any other liquid oil expands with temperature, and depending on whether the the engine oil level should he checked cold or warm it could differ quite a bit.

Dry sump engines should almost always be checked warm, sometimes with the engine running, sometimes right after cut off.So first I would find out when/at what temperature the engine oil level should be checked.
Most outboards are dry sump aren`t they?

My experiences on dry sump are based on cars not boats.But should be pretty much the same.
avanti is offline   Reply With Quote
Old 11 May 2004, 02:15   #6
Country: UK - England
Town: nr Lymington
Boat name: JU-JU
Make: Halmatic PAC22
Length: 6m +
Engine: 140.5 Mermaid
Join Date: Sep 2003
Posts: 1,400
There was an issue with some engines where the bung on the dipstick could move up the dipstick if used ‘aggressively’, resulting in an apparent increase in oil, but this is only a remote possibility. I think that what JW is saying could be a real issue.

Incidentally did you de-winterize the engine before use? Some people virtually fill the sump when winterizing the engine.

Scary Des is offline   Reply With Quote

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