buckeye_paul
New Member
I use Pennzoil Premium Plus synthetic blend (XLF). I get it at Sam's Club for $13.98.
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I use Pennzoil Premium Plus synthetic blend (XLF). I get it at Sam's Club for $13.98.
I have a oil injection bypass also, just had an STB rebuild 717 motor installed and the guy attached the hose from the rotary valve to the exhaust that was full of oil. I do have an empty oil tank in my ski. Is this the correct way to bypass or what should I do?
This thread is on the oil bypass. So... if you would like answers on 1, 3, and 4... please start your own threads. (Break the questions up)
As far as #2.....
The only part that really fails in the the oil system is the main, oil drive gear. Unfortunately... that gear in on the crankshaft, and to replace it... the engine has to be split to get to it.
I like oil injection system. If maintained, they do work well, and they save you $$$ by burning less oil. Also... at idle, your smoke will be minimized. But... on the Merc engines... the gear can give out without warning. If you've ever overheated the engine... there is a high probability of the gear being damaged... and at that point... it's just a mater of time before it wears out.
Since the boat is new to you... and you think you may want to keep the system... I would find a shop that has a bore scope, and have them inspect the gear. Basically, the oil pump needs to come out (2 bolts) then the bushing, and drive gear will slide out of the block... and a scope can go in that hole to look at the gear on the crank. If there is no damage... run the pump. If the gear shows ANY wear... go pre-mix.
Dr Honda. Have read alot about the oil bypass...Since my eng is apart, should be back together this week. What parts would you recommend replacing instead of bypassing. thanks
Does anyone have some pictures of the steps?
So everyone is happy with the change?
Made much smoke at low revs?
After reading many postings across the internet, it seems that there are many who have bypassed the oil injection on a mercury engine (typically the outboards). For those that have bypassed the oil injection system on your Mercury engines does anyone have any problems or regrets? Does the smoking let up once you get a constant 50:1 ratio? Has anyone switched back to the oil injection system? Did anyone consider a change but decide to keep the injection system? How about a light premix and oil injection? (If so what ratio) There are many reports of oil injection failure, but I imagine that overall there has to be thousands of the Mercury engines in many different applications with no issues, but my engine is a year older and I do not have the capability to rebuild it if there is a failure.
I know I went back and forth last season about doing the bypass, but never got around to doing it because I like the variable ratio, but I typically fill up from 5 gallon containers so premix is not a real issue. For about $18 I just received the bypass parts from boats.net as specified at the top of the thread, and I took a quick look and have some questions about the procedure.
I guess the first question is am I looking at the correct location for the oil pump? (see attached image) If not please provide some direction. What is the best way to get access to removal? Do you need to remove any additional parts?
Are there any other points of advice as far as converting the system.
All comments are welcome.
Thanks again