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Old 24-07-2011, 19:44   #1
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Recurring Oil Lock

I've had a Yamaha 4stroke4hp outboard for my dinghy for 8 years. Frequently, oil gets into gas line and floods the spark plug so I can't start the engine (starter cord can't be pulled). I know this is from "improperly" tilting the engine but I have to store engine on boat when not on dinghy. I've laid it horizontally resting on throttle side as suggested by manufacturer as well as standing it up with a 20 degree lean, again with throttle side down. Regardless, 1/2 the time it freezes up when I remount on the dinghy. I have no room on my swim platform (29ft Sea Ray) to mount the engine with the dinghy up on davits. 2 cycle engines are no longer available. Any suggestions how to avoid problem or mount enginge for proper transport/storage on boat?
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Old 24-07-2011, 20:19   #2
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Re: Recurring Oil lock -

Your problem is not storage. Oil on the spark plugs indicate bad piston rings or valve seals. Storing the engine on a particular side is to prevent the oil from draining out of the motor through the vent. You would see an oil puddle on your deck.

Do a compression test.
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Old 25-07-2011, 07:10   #3
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Re: Recurring Oil Lock

Greetings and welcome aboard the CF, rrodner.
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Old 01-08-2011, 18:18   #4
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Re: Recurring Oil lock -

Quote:
Originally Posted by Kapena View Post
Your problem is not storage. Oil on the spark plugs indicate bad piston rings or valve seals. Storing the engine on a particular side is to prevent the oil from draining out of the motor through the vent. You would see an oil puddle on your deck.

Do a compression test.
With respect to the above. Na. If it was rings or valve seals you would know it while running not while storing. Your 4 Yammy will lock if stored or transported wrong. If stored on the handle, which is recomended, is there a chance that the gearcase is higher than the powerhead? Or while installing it on the dinghy that it is, for a while, in a powerhead down attitude?
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