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Old 08 January 2012, 14:42   #51
TomKat's Avatar
Country: Ireland
Town: Bangor
Boat name: Lencraft 4.8m
Make: Lencraft
Length: 4m +
Engine: DT55HP Suzuki
Join Date: Jul 2011
Posts: 469
I think their point was that for an engine that is almost 30 years old a pressure drop is not the end of the world as long as it runs OK but I could be putting words into their mouths!

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Old 08 January 2012, 15:09   #52
dubrus's Avatar
Country: UK - Scotland
Town: Glasgow
Make: Ribcraft 6.8
Length: 6m +
Engine: Suzuki df200
Join Date: Jun 2010
Posts: 2,405
30psi is close to the end of the world in outboard terms :-).

there is something amiss in that top cylinder obviously.

i'd rather have 3 cylinders the same at 90psi than the readings you got.

running ok is relative, i think your not running ok which is a result of the PSI reading. your probably losing a good 3/4knots and 500rpm with that reading.

will the engine work for someone pottering about-yes without doubt. however it still doesn't change the fact the motor needs pulled apart if the owner cared. it is only a matter of time before whatever it is becomes terminal and it will no doubt be in the middle of nowhere it happens and not going back on the trailer.

btw i have had an engine before like that, funnily enough a suzuki 85 the same model as yours. after winterisation i had lost about 5/6knots, upon inspection with compression tester the top cylinder was about 35 psi off. took the head off and seen a crack-i.e the end of the world! :-(.

enjoy your new motor-take the compression gauge with you when buying and trust me, not your outboard dealer, if the PSI is 5 or so of a diff then walk away :-)


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