UPDATE: Thanks to @Zack342 74816-JU40D got replaced by: 74816-6SA0A

I wanted to make this post to let others know that Nissan has updated the infamous sunroof drain grommet, the newest design seems to have fixed all the issues all the other revisions suffered from. My G came with: 74816-JU40B. This design used more gasket area, but at around 90-100K miles (I forget the exact mileage) my drivers side unit failed and started to leak water. I had both drivers side and passenger side replaced with the same unit.

I wanted to replace my rear ones as preventive maintenance, and was told by Amayama that part: 74816-JU40B was replaced by: 74816-JU40D. I have no clue what: 74816-JU40C looks like, but it too is no longer valid.

I got the new units in, and can say that Nissan must of been watching a lot of the things people were doing to fix this ridiculous issue.

The new design incorporates a channel that extends past the grommet housing, this channel inside also features the infamous center baffle, but now it is extended further forward and there is little chance of it causing a blockage like the old one. If the gasket fails on this unit, due to the channel extending forward there is no chance of water seeping through the side locking tabs like the previous designs. The new units plastic also has a thicker wall thickness.

If you need to replace your sunroof drains, make sure to get: 74816-JU40D, and not the older models, because they are all designed with the same design flaws! They should of made this unit like this in the first place, would of saved a whole lot of trouble for many! This is one of those "ticking bombs" on this car like the gallery gasket and coolant heater hose fitting....

74816-JU40D (Left), 74816-JU40B (Right)

 

Thanks for posting this, new one definitely looks like the fix, after all these years

 

Nice find Krzysztof47!

This should be sticky'd somewhere here. Now that there is a superceeded part and this part shares some of the designs folks end up making with the original ones.

 

I think this is a fairly new part. But yes, I think they fixed all the stupid issues with the original design. The original one relied on the foam gasket to seal it, so when the gasket failed it would leak. Of course!

 

Yes, I agree this should be sticky'd. Might help some with this ridiculous issue. Thanks!

 

First, many thanks to Krzysztof47 for this information, but I must play "Devil's Advocate." Even with a re-design (the 3rd/4th?) this grommet/ junction will always be a choke point and have a propensity to leak. As I've said in other threads, the only guaranteed method to avoid this potential is to re-route the drain (bypass) to the floor and out via the (existing) AC evaporator drain line.

Also, as I've said prior, just like the infamous plastic heater hose coupling, the sunroof drain should be addressed before costly repairs are needed. You know, that whole "ounce of prevention" deal. Just my 10¢

 

I agree, you are correct. If you want to fix this issue and want to be 110% sure this won't happen ever again, the bypass mod is the way to go.

 

Great find, thanks for posting this Krzysztof47.

Just starting getting some water on the driver side floor mat. Car has under 50k miles on the clock, but has been parked outdoors for the last 6 years or so. So guessing combination of age and weather exposure has led that drain (gasket) to fail. Will bring the car in soon to have these new plugs installed, hopefully by a nearby mechanic and not the dealer.

In case folks aren’t that familiar with the process, I found this video really helpful:

 

The "Choke point" is basically an anti-water noise provision. The bypass or straw methods work but, ideally you should check your sunroof adjustment and Sunroof seal, if you are getting enough crap in your drains either method (Straw or Bypass) can clog.

1000% agree on replacing the heater hose and fixing these drains as the first thing to do when acquiring these cars, its amazing how many people post about these common issues.

 

Sorry to hear that, this new drain plug should get that sorted. I think when Infiniti does it, they want to remove the entire dash, which is nuts. It's worth the hassle of doing it through the openings where the AC vents are (Way less labor and this is how most people do it, it seems).

I think in that video, they stick a straw into the grommet as the fix. Problem is, the seal is no good, so it ended up leaking on them again.

 

I've posted in the coupe section that with the right tools you can fix it yourself in about 5 minutes, especially the passenger side since the steering wheel isn't in the way. Just need to remove the vent and A pillar cover. It's not that the gasket fails it's that the plastic tube in the A pillar shrinks over time due to heat and such and it pulls on the plug. You just cut the tape and just pull the tube to give it some slack and replace with a new plug and gasket. Mine has held up for about 5 years without leaking again. And I explain how to dry up with rice.

 

Wait so you found the tube was completely pulled/disconnected from the drain?

 

That’s interesting. When did this new design come out? I bought a different one last year and it doesn’t look like that.

 

That's interesting, that's probably what the: 74816-JU40C unit is. Then Nissan realized it still needed to be updated lol.

 

No. It pulls on it just enough where it's not a tight seal anymore and allows a little gap that allows water to drip through.