Watch this video! Save yourself a headache and $$$ - Toyota FJ Cruiser Forum
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post #1 of 27 (permalink) Old 03-08-2016, 07:30 AM Thread Starter
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Watch this video! Save yourself a headache and $$$

So here is the story, this last weekend while offroading all was going fine and dandy when suddenly my spotter noticed oil leaking quickly out the bottom of my FJ. Got out and checked myself and sure enough it was true. Thought I must have scrapped by oil pan or something since I currently have no skid plates.



Upon further inspection I noticed the regular oil pan was unscathed from the offroading and so was the front differential, but that the oil was coming from a location further up. Climbed further underneath the FJ and looked up while getting splashed with hot oil in the face is it still dripped out. I noticed a small crack in the area off to the side of the oil pan, so basically the bottom of the engine or what diagrams call the "upper oil pan" or "oil sub assembly".







I was confused how this could have happened. The location was up and out of the way from rocks and everything else in the area was fine, but then I noticed 2 missing bolts that are designed to secure the rear end of the front differential. In the following parts diagram it is part number 90105-12272, these are the bolts that were missing. Without them the front differential had quite a bit of play, and as I discovered, enough to the point that when under extreme stress from torque and articulation that it can contact and puncture the upper oil pan.



You can see in the following photo off to the right side the bracket that has bolts in it and this is the bracket you need to look for to ensure you have the bolts. One bolt is bolted from the bottom and the other side it is bolted from the top. Off to the left are the bracket arms that one would unbolt from the front and then add spacers to if they were installing a diff drop.



A similar event unfortunately happened to another forum member during one of the early FJ Summits, his damage was a lot more than mine though!




So watch this video and then go out and check to see if you have these bolts and if you do, make sure they're tight! Not sure why mine were missing, but I know in the past my FJ had different mods like a 6" lift and diff drop that were removed so some idiot probably forgot to put these bolts back in. Don't let this happen to you! Check the bolts! Could save you over $1,400!


Make sure this thing is bolted!!


Last edited by FJX2000; 03-06-2018 at 09:01 PM.
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post #2 of 27 (permalink) Old 03-08-2016, 08:09 AM
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Re: Watch this video! Save yourself a headache and $$$

Thanks for sharing this with us Hayden. I'm sorry that this happened to you, that's quite a bit of dough to spend for having 2 two bolts missing. Are they hard to get at..I'm going to check mine after reading your experience.


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post #3 of 27 (permalink) Old 03-08-2016, 08:23 AM
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Re: Watch this video! Save yourself a headache and $$$

I am sorry to see and hear that.
Also glad to see you got it taking care of, even thought it was expensive.

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post #4 of 27 (permalink) Old 03-08-2016, 08:25 AM
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Re: Watch this video! Save yourself a headache and $$$

Man sorry to see that. I`m sure the previous owner took all their mods off to sell and didn`t really care how well they put that FJ back together. I`m still going to go crawl under the FJ and take a look just incase. Thanks for sharing

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post #5 of 27 (permalink) Old 03-08-2016, 08:50 AM
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Re: Watch this video! Save yourself a headache and $$$

Thanks for sharing your experience. Its unfortunate that there was not some sort of noise to forewarn you before it beat a hole in the casting. Will this require pulling the motor to fix?


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post #6 of 27 (permalink) Old 03-08-2016, 10:03 AM
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Re: Watch this video! Save yourself a headache and $$$

Yikes! x2 on the PO being the cause, but still scary. Will definitely have to check em!

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post #7 of 27 (permalink) Old 03-08-2016, 11:41 AM
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Re: Watch this video! Save yourself a headache and $$$

I saw your original thread and was thinking you had damaged the engine block which would be even more expensive. But as you correctly stated, it is your upper oil pan that was damaged. Is this something that can we welded or even JB welded rather than spending $1400 to replace the upper oil pan?

p.s. I have never seen a cast aluminum oil pan and had no idea there were two different ones. I had only seen the small steel sump oil pan. It all makes sense now as to where all the other 5 qts of oil are stored.
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Last edited by SilvFx; 03-08-2016 at 11:44 AM.
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post #8 of 27 (permalink) Old 03-08-2016, 12:37 PM
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Re: Watch this video! Save yourself a headache and $$$

Sorry to hear it bro. We appreciate all the time it took you to inform us and post proper pics. Well done and thank you.

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post #9 of 27 (permalink) Old 03-08-2016, 01:10 PM
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Re: Watch this video! Save yourself a headache and $$$

Bought mine brand new but I'll still check!

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post #10 of 27 (permalink) Old 03-08-2016, 01:36 PM
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Re: Watch this video! Save yourself a headache and $$$

Fantastic video! We'r experiencing a few warm dry days so Iv got the sprinkler under the FJ right now washing out the winter salt so I can do some rush management so this is timely, I can check when I'm under there.


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