tehlaser
08.05.2021 8:30:21
Replace the drain plug after first coating it with teflon tape or anti-seize compound.
See full version: Changing lower gear lube on force 125hp
Replace the drain plug after first coating it with teflon tape or anti-seize compound.
Re: changing lower gear lube on force 125hp more
The forward plug is fill and the rear plug is vent. So, fill through the forward plug until oil comes out the vent. Let the engine stand vertical for about 1/2 hour to let all air rise then top off again until oil comes out the vent. This ensures that the top bearing gets oil. Takes somwhere around a quart. I don't know exactly because I pump mine from bulk.
Now, here's the reason you fill that way: The front plug communicates with a large chamber running all the way down to the gearcase torpedo behind the forward gear, the rear plug opens into the top bearing space. While it is possible to fill from this plug, you would be forcing oil, not air through the top bearing and a small vent hole low by the bottom bearing. This is difficult. You might think you have it full when in actuality it might not be. The top bearing would run without oil----You know the rest---
Re: changing lower gear lube on force 125hp [links]
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I've tried torqueing it with a larger screw driver/wrench combo as well as using a bit of WD/40 to try and break it loose, no luck (wish they didn't use a flat head screw). more
Looking for some suggestions on alternative ways to drain the lower unit's gear oil. I was able to get the upper drain plug out and drained almost half the oil, although its the lower half (plus any water, fingers crossed) that I'm more concerned with). more
Is siphoning or pumping the oil out through the upper drain plug an option or is the risk of getting my pump tube stuck in the gears not worth the risk?
So I attempted to change the gear oil in my 1987 Cobra lower unit. Of course, it didn't go quite as simple as some of the write-ups on the forum. Turns out that the bottom gear oil drain screw/plug is jammed and won't back out of its threads no matter what I throw at it. more