Oil drain hose not working

[Jgran]

Hey everyone, I have a feeling that this could be one of the dumbest questions I could ask but I’ve wasted 2 hours and still can’t figure out the problem. Working on changing oil on my new to me 2021 G23 with ZZ6 motor. Hook up oil extractor to drain hose, open oil fill cap and pull dipstick out slightly. Absolutely no oil coming out of drain hose. I have checked engine oil level and it is fine on dipstick. Tried to trace oil drain line but can’t follow it near starboard rear engine mount. It seems to double back toward front of engine or something? There isn’t some valve to turn or anything, right? I would like the oil drain to work but if not, can I just feed an extractor tube down the dipstick tube like the good old days?

[NautiqueJeff]

Using an extractor on the drain hose has always worked for me.

https://www.planetnautique.com/Corre...anuals/ocp.pdf

[Jonny Quest]

Obstruction? Open oil fill cap and gently blow compressed air back into the hose and see if that allows the oil to flow. Warm oil flows better,

[jpwhit]

Drain hose is probably kinked somewhere. Use a small mirror and flashlight to follow it all the way back to the oil pan connection. It's much better to use the hose than to extract oil through the dipstick. You don't get much of the nasty stuff that lays down in the bottom of the oil pan when you extract through the dipstick.

[bturner]

Man that reference article Jeff posted lays out the process about the best I've seen. You should be able to pull a vacuum using the method outlined in the article Jeff posted. If JP has it right, you probably have a kink somewhere. Before finally taking the time to get the correct fittings to do this correctly I used to insert the vacuum tube in the the oil drain hose. If you do this you should be able to insert it all the way to the pan. You should be able to do this with yours and see if there is an pinched hose somewhere. I have seen the drain hoses wrapped around stuff and nearly tied in a knot before. I know the engine compartment can be very cramped but if you can locate the drain on the oil pan, this is where the oil drain hose will be attached. See if you can trace the hose from there back to the end. I haven't worked on your specific boat but I've always been able to see the oil pan and drain on every other boat I've worked on.

[Stevemo14]

Did you warm up the oil before trying to drain? If not even the extractor may not be able to pull it through until the pump is primed. I know my oil doesn't come out at all without putting some heat in the motor first. Once I do I don't even need the extractor, it just grains right out of the tube.

[Jgran]

Thanks for the input. Engine was warm when I started, not so much 2 hours later when I gave up. I'm going to have to agree with bturner that the hose is probably wrapped around something and kinked. I know that I read that some guys run the hose out of the hull drain but I'm a good 18" short of having enough hose to do that which reinforces the thought that it is wrapped around something. When I put the vacuum extractor on the hose it probably just seals up the kink even tighter. I'll get out the mirror and flashlight and tear into it this afternoon. I'm assuming the oil drain on the oil pan will be toward the rear of the engine (stern)?

[NautiqueJeff]

Your boat is a V-drive, so the engine is in backwards. The rear of the engine is toward the front of the boat.

[Jgran]

NautiqueJeff appreciated. Wasn't sure if there was a different oil pan or something for this application.

[vision]

JGran, my ZZ6 is similar. I have to have the suction tube for my extractor inserted farther into the drainage tube before there is successful flow than my previous G or any previous inboards. With my ZZ6, I am practically in the oil pan before I am successful. Might be time to go the route of a sealed suction fitting.


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[Jgran]

Success! Removed the starboard engine separation panel and the rear panel frame piece to be able to get my head around the back of the engine. The oil drain hose comes off of the oil pan on the starboard side of engine and the hose routes to the rear of boat. The hose then bent 180 degrees back toward the front of boat and was zip tied with about 4 other hoses directly beneath the rear starboard engine mount. At the zip tie, the hose was kinked and flattened. I was able to route the hose to the rear of the engine mount and I removed it from the hose bundle and replaced zip tie. At first I tried to put an extractor hose down it, but it didn't make it to the oil pan. However, I was able to get a little oil out so I'm pretty sure that it went through the flattened part of the hose. I then tried to hook directly to the fitting on the hose and I never have been more happy to see dirty oil flow up a hose in my life. I appreciate everyone's responses and hopefully nobody else gets to deal with this issue in the future.

[Scooter G]

Good job Jgran. Yet another successful followed through thread. Good input and follow up, nice job!
Sounds like someone was having a rough day (their last day) at the factory when they zipped the hoses.

You don't suppose that is the 1st oil change on a '21, hmm...

[srock]

Same problem I had. The hose was short and would not reach the through-hole drain plug so it was pulled and subsequently kinked.