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Old 11 July 2009, 05:53   #1
Country: UK - Scotland
Town: Queensferry
Make: Northcraft/Osprey
Length: 5m +
Join Date: Jun 2009
Posts: 31
Suzuki crank seal orientation

I'm just about to reassemble my Suzuki DT4 (2-stroke single) after replacing the main bearings, but need some advice regarding which way the crank seals should be fitted.
I have always assumed that the seals would be fitted with the spring to the inside of the engine, and the lettering facing the crank ends.
My workshop manual (Seloc) says the same.
However, when i dismantled the engine, the lower crankcase seal was fitted with the spring side facing outwards (i.e down)
Is this likely to be correct, or put together incorrectly on a previous occasion?

Douglas C is offline   Reply With Quote
Old 11 July 2009, 14:03   #2
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
could be right......the gearbox seals were like that on my yammy, i guess because the water pressure is higher than the pressure in the gear case.
same goes for the crank seals, The crank case is is at below atmospheric pressure so the spring on the outside of the seal would keep the air out.
i would double check though! It does LOOK wrong if your used to automotive stuff.
I am usually not as green as i am cabbage looking.
doggypaddle is offline   Reply With Quote

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