Is Your Outboard Leaking Oil From The Lower Unit Gearcase? Build a Pressure Tester To Find The Leak!
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- čas přidán 27. 08. 2021
- August 28, 2021: How to build your own pressure tester to find lower unit leaks.
Earlier this year I found water in my outboard's gearcase oil during a pre-season oil change. In order to locate and repair the leak, I needed to pressure test the lower unit.
After seeing the prices of pressure testing adapters, I decided it would be much cheaper to build my own. The total cost of this project is around $10, but it saved me hundreds of dollars in diagnosis fees from my local mechanic.
In this video I will walk you through the process of constructing your own pressure tester adapter and explain how to use the adapter to find leaks in your outboard gearcase.
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Something a whole lot simpler. All I did was use the piece that came with my gear oil pump that threads into the gear case and a hose adapter that came with my $12 pressure pump. Badda bing budda boom done.
Thanks for the idea. Just got a 1967 9.5 Johnson and was trying to figure out a diy pressure tester. This should work.
You da man! That's awesome fabracobble skills!!!!
Simply genius! Thanks
I did the same as chris gould. Fitting and tube from a fill kit and a nipple attached to a bicycle pump with a pressure gauge. Give her a few pumps and it has the added benefit of showing the pressure go down on the gauge if you have a leak.
They literally sell a 3/8-16 threaded fitting with an o ring seal and hose barb for not very much money. Would have saved a ton of time. This is what I’m in the process of rigging up to my automotive coolant pressure gun. Same concept as a $175 marine “lower unit tester”
Great tip!
Nice work 👏
Hol long is bolts that you drilling?
Thanks
Thanks for the info!
Great video, and awesome idea. I’m heading to my shop to make one, seeing as in the pressure test mode now. Lol
I need to build me one of those! Now way I can drill that whole straight LOL! Im gonna try when it come time!
Mark, if you need a drilled bolt I can send you one
@@TheWeekendAngler I'd love that Josh! Let me know what you need from me. I got sticker for you too!!
Great video helpful info thanks
Glad it was helpful!
Good tip thanks
No problem 👍
I've built your device but am having difficulties tightening the valve stem in the pvc 1 inch fitting. The head is round and I can only tighten so much. My silicone doesn't seem to stop air from blowing through it at 3 pounds of pressure. Any suggestions?
Great video thanks for sharing this idea. Made mine this week. Question, can you use it in the top hole with oil in the gearcase?
It would definitely thread into the top hole. It might be worth a shot. Best case scenario, it would push some oil out at the leak point.
Great Video! You are very Clever! My question is does the lower unit oil reservoir include the lower part of the Skeg.I chipped the lower piece of metal(the point) off my skeg and sometimes I see oil there on the garage floor not much just a small circle.
I don't know of any skegs that hold oil. Not saying there aren't some that might, but I've never encountered one that does. What kind of motor do you have?
@@TheWeekendAngler It`s an old 89 Merc Blk max 150
@@horacelee880 yeah the skeg on an old black max shouldn't have oil in it. Probably looking at either oil residue from the exhaust or a leaky drain plug seal.
@@TheWeekendAngler Thank you for the info.I really appreciate it bro.
Got a 1987 GT150, just bought it and ran it this weekend. After lower motor for sitting in the driveway, there's black oil from exhaust. I assume it's leftover unburnt oil. Ideas?
A little oil residue from the exhaust ports is normal on a 2 stroke outboard. It's unburned oil from the cylinders. Probably running a tad rich, but it shouldn't cause you any concern.
I looked thru your website and didn't find your follow up video on replacing the oil seals, have you done that yet? I think mine are leaking but I just drained my lower unit oil and there wasn't any water but I seem to have oil (black) coming out of a small hole that is toward the rear of the lower unit-any idea on where that may be coming from???
I replaced them but the video didn't turn out as good as i would have liked, so I'll have to reshoot that next time I replace a set in something.
Mine turned out to be the prop shaft seals as well as the bearing carrier o ring.
I found a used working lower unit for a good price and just replaced the entire lower.
There is a shift shaft seal in the vicinity of where you're describing. However it could also be exhaust residue if yours is a 2 stroke like mine.
@@TheWeekendAngler Thanks for the reply, mine is a 2 stroke and I saw on other sites where it could be exhaust residue, I'll keep a eye on it to make sure.....
This seems overly complicated. Don't they sell pneaumatic fittings that screw directly in?
They sell a pressure tester, but be prepared to hand over upwards of $100.
If you run a shop, it's a good investment. If you're a DIYer though...
@@TheWeekendAngler I use the tube and fitting from a gear oil pump and attach a bike pump to it, works great and it uses tools I already have around the garage. Just an idea though, there's lots of ways to skin the cat.
@@williamnixon5037 that's a great idea, also! Thanks for sharing!
Could u not have just went ahead a replaced the seal 99.9 % of the time thats what it is ?
I could have, yes. But I'm not one to throw parts at a problem. Had it been the o ring behind the bearing carrier, like I've had happen before, replacing the shaft seal wouldn't have solved the issue.