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Old 06-03-2012, 07:06 PM
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350 leaking oil

As some of you know my latest project is a 350 powered Jersey Speed Skiff.
Motor installed flywheel forward, 12 degree tilt to rear. we drive the prop off coupler attatched to the crank shaft. Motor has been slicked inside and Glyptalled to aid in oil flow back to the pan. Drain holes over cam been plugged with Moroso breather tubes. Pan Evac breather system. Here is the problem, I have an oil leak at the crankshaft sprocket, not bad but a little dribble. I have replaced the seal and checked the new sprocket hub....still leaks. I am thinking I have so much oil running down the inside of the timing cover, it leaks out the seal. Need more breather? more drainage? Any ideas fellas?

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Old 06-03-2012, 10:47 PM
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You may want to uninstall the vented tubes you have in the drain back holes. And yes, without them some oil will make it's way to land on the crankshaft, but how much horsepower is it costing it to leave them open? Not even enough that you would notice. Since the engine is installed flywheel forward I take it that it does not use a balancer but a sprocket system as mentioned. Whatever slides on the crank hub and makes contact with the seal should be really smooth, lubed up good upon installation with no ridge cut into the surface by the seal.
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Old 01-25-2014, 11:27 AM
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Removed the aluminium timing cover, contoured the inside to flow more oil between the bottom of the cover and the block. Removed pan evac and installed to large VC breathers. Removed drain back gaurds from right side of valley only. Polished chain coupler nice and smooth Seemed to have done the trick.
Just going through some old posts and thought I would update.
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Old 01-26-2014, 12:14 PM
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Just back to the basics, you are running non-detergent oil.... If not, boat engines require non-detergent oil because regular oil foams (maintaining higher rpms). This may be what your experiancing. It may be the simple changing of oil that may take care of your problem. (Yes, I used to work in the marine industry).
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