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Lower Unit Wrap

Lower Unit Wrap

By Dan Armitage

Lower Unit Wrap

[ February 19, 2013 ]
12
by Dan Armitage
image-finetooningwinter
If you store your outboard in the vertical position as shown, there’s no reason to wrap the lower unit in plastic during the off-season.

Following the birth of our son, my wife once commented that she was in the market for a new lower unit as a result of the ordeal. The statement reminded me that a properly functioning lower unit can be as important to maintaining a relationship as it is to a boater who counts on his engine to perform on cue.

If the outboard or sterndrive that powers your pontoon boat is expected to remain idle over the course of an off-season, it’s important that it be prepped and protected to allow it to weather the winter and fire-up come spring. That putting-to-bed process is fodder for a fall blog, but during my recent mid-winter check on my pontoon boat, which is stored on foam blocks in the yard of my local lake’s pontoon boat owners club, I noted something new. Several members’ (outboard…) lower units, including the prop, were encased in garbage bags, which were snugly duct-taped or bungee-corded just below the cowling.

Pondering the possible reasons for protecting the lower unit in such a manner, I placed a quick call to Boating contributor, outboard expert and good friend John Tiger. Tiger lives on Lake George, NY, a latitude that – like mine – forces a frigid off-season off the water for boaters each winter. I figured he might know why someone might encase their engine’s lower unit in Glad Wrap.      

“It’s an attempt to keep water out,” answered Tiger. “If an engine stored out in the elements is tilted up in the off season, at enough of an angle enough to allow rainwater or snow melt to accumulate in the exhaust hub, it could find its way into the gear-case housing, freeze and expand, and cause damage.”

He added that some boaters bag their lower units – as well as their power-heads – when in storage to help keep “bugs and critters” at bay and, in the case of the lower units, to keep the propeller out of the sight and therefore, hopefully, out of the mind of potential thieves.

Tiger added that if you store your outboard or sterndrive tilted vertically, so that no water can accumulate in the exhaust hub, there’s really no reason to encase it’s southernmost unit in plastic.

Suggested Reading
Winterize A Sterndrive
The Complete Guide To Winterizing Your Boat

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Since I'm the guy who Dan contacted for input, I should respond. While I wouldn't completely rule out the possibility that sand or dirt could somehow find it's way into the engine through the engine's propeller exhaust hub, it's highly unlikely. I'd like to ask reader Myles--have you ever actually seen this happen? In my 35+ years in the industry I've never seen this happen. I typically tilt the outboard vertically to allow all water to drain from the powerhead and exhaust housing. If I have to store the unit tilted, I then seal the propeller exhaust hub to keep water out. I've never had an issue with this method, and have prepped and stored boats for winter rest since 1976. I've never personally seen sand or other debris inside an engine as a result of not covering the gearcase. However, I have seen cracked gearcase housings as a result of not draining and covering the unit. Hope this helps...

John Tiger

Myles,

Thanks for responding and sharing what you do to protect your engine in the off season, but I stand by the advice offered by John Tiger. Unless you've got it stored somewhere like the Sahara where wind-driven sand may be an issue, the chances for enough wind-blown debris to find its way into and work its way up inside a stored outboard's exhaust tubes to cause problems is miniscule. That said, if bagging your outboard makes you feel better about how your engine is weathering the winter, that peace of mind alone is worth the price of the effort!

Sorry Dan your wrong,I always cover the lower units with garbage bags and arrange the corner to sit lower than the skeg, and snip a small hole to allow water to drain out ,and here's the reason why, It's not to keep out water it's to keep out dust and sand that blows around due to the strong winter winds, drive down any road in the winter and what do you see flying around, SAND, now imagine that working into your engine via the open exhaust ports in either a 2 stroke or 4 stroke engine, because no matter how you stop an engine one exhaust valve or port will be open,so why take the chance of allowing dust and dirt to ruin your engine, for the sake of the price of a garbage bag.

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