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Old 05-18-2023, 10:01 AM   #1
Lars
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1NR-FE Valve Cover Gasket replacement

Hi all,

My 1NR-FE engine is leaking from the top and I'd like to replace the valve cover gasket. I have the gasket already, and I started trying to do the job but honestly the electric cable harness on top of the engine is slightly more complex to remove than I expected...

If anyone could provide some help, maybe a short video, pointing to the best option/way to remove the electric cable harness just enough to make the replacement of the gasket an "easy" job, would be very much appreciated!

Thank you.
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Old 05-18-2023, 10:39 AM   #2
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Harness shouldn't be difficult, helpful tip is to mark with tape and label with numbers to match connector to connector so you know where they plug into.
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Old 05-18-2023, 10:39 AM   #3
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Never did it and I can’t give you any advice except to try searching YouTube. YouTube is your friend!
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Old 05-18-2023, 02:37 PM   #4
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Never did it and I canít give you any advice except to try searching YouTube. YouTube is your friend!
I appreciate I'm not giving too much info. I'll try to put up a video tomorrow explaining exactly what my trouble is.

I did search extensively of course. The best I could find was this time lapse - https://youtu.be/N-ei0lnXqEU?t=238
Which, at the time that I pointed to in the link, seems to indicate the connections to the alternator are last to assemble (which would mean first to disassemble), and I think this would be enough to get the valve cover off... but to do this I think I would have to at least get the car on ramps to unplug the harness from below. A real piece of work compared to other models I have found on youtube!!
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Old 05-18-2023, 02:39 PM   #5
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Originally Posted by LostinSpace View Post
Harness shouldn't be difficult, helpful tip is to mark with tape and label with numbers to match connector to connector so you know where they plug into.
Thanks for your reply. I will try to put up a video tomorrow pointing out exactly what my trouble is.
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Old 05-18-2023, 03:04 PM   #6
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In the meantime, I found this electric diagram of the 1NR-FE. Seems I need to disconnect all these connectors here and hopefully I'll be good to go. But like I mentioned, most likely I need to get the car on ramps, take out the splash guard and get to these connectors from below...

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Old 05-18-2023, 04:24 PM   #7
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Quote:
Originally Posted by Lars View Post
In the meantime, I found this electric diagram of the 1NR-FE. Seems I need to disconnect all these connectors here and hopefully I'll be good to go. But like I mentioned, most likely I need to get the car on ramps, take out the splash guard and get to these connectors from below...

On my 1974 VW beetle it took about two seconds to get the valve cover off!



This is progress?
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Old 05-18-2023, 07:14 PM   #8
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unbolt the harness and dissconnect it then "roll" it out of the way, youll have to dissconnect all the way down to the ac/alt to get the movement you need
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Old 05-19-2023, 12:16 AM   #9
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Originally Posted by bronsin View Post
On my 1974 VW beetle it took about two seconds to get the valve cover off!



This is progress?
When I searched for "Yaris valve cover gasket replacement", the procedure was quite simple on most of the videos I found. The 1NR-FE engine seems to be the exception, where we need to unbolt like a "gazillion" things that are in the way...
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Old 05-19-2023, 12:20 AM   #10
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Originally Posted by sh0rtlife View Post
unbolt the harness and dissconnect it then "roll" it out of the way, youll have to dissconnect all the way down to the ac/alt to get the movement you need
Thanks, seems this is the answer I was looking for. And it's basically necessary to get under the car, right?

And on the right side, better to disconnect as well lamba sensor, etc? Or is this one not necessary?
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Old 05-19-2023, 03:50 AM   #11
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Here's the video I promised explaining my troubles - https://youtu.be/FpdDaJjtgMU
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Old 05-19-2023, 08:01 AM   #12
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Jesus H Christ! What engine is that a 1.3 L engine? Or is it a 1 L engine? That’s crazy complicated just to get the valve cover off! If you have ramps getting under the car should not be a problem.

Good luck and tell us what happens!
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Old 05-19-2023, 03:17 PM   #13
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on the 1.5, looking at it from the front, only the BELT side stuff needs to come off, the battery side stuff can remain

i was in there a couple months back..and didnt touch anything on the starter side..also getting under the car is NOT a requirement, the only tricky bit is the crank pot plug and bolt which can be accessed with the car on the ground and the wheel turned
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Old 05-20-2023, 05:14 AM   #14
Lars
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Originally Posted by sh0rtlife View Post
on the 1.5, looking at it from the front, only the BELT side stuff needs to come off, the battery side stuff can remain

i was in there a couple months back..and didnt touch anything on the starter side..also getting under the car is NOT a requirement, the only tricky bit is the crank pot plug and bolt which can be accessed with the car on the ground and the wheel turned
Short update. I don't think it would have been able just turning the wheel. I took the splash guard out and still it was a *real piece of work* to get the plastic pin out...

Here's a video update - https://youtu.be/uCt6MjUIQRo

I think now I have just enough clearance to get the cover out... only problem now is having a family, but I hope I can continue later today. I'd like to have this car running by Monday... let's see.
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Old 05-21-2023, 05:45 PM   #15
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Ok guys, finally it's done. I hated pretty much every part of it.

Like discussed, there was enough room when unclipping/unbolting the electrical wiring that runs down the alternator - BARELY.

It was nerve-wrecking to slide the cover out like this... but 10 times worse it was to slide the cover back in, with the new gasket, afraid that the sliding could peel the gasket off the cover.

It was a 2 man job, for sure. A buddy of mine was pulling on the electrical cabling harness while I was trying to slide the cover back in. The PCV valve also got in the way, but I didn't want to try to remove it as it was new and stuck in there pretty good...

After sliding the cover back in I was "feeling" the gasket blindly with my hands beneath the cover to try and make sure everything was still in place correctly and it felt good, so we just went for it. All cover bolts were torqued to 10NM. After turning the engine on, there was an already known to me low RPM and vibration, but I plugged my OBD2 scanner and there were no engine codes and all values that I can understand were looking good to me... fuel trims were even at 0%, both long and short term!!

Here's a short "reel" I made of the ordeal... https://youtu.be/Kko0YM2d49Y

But it's really not something I feel like I would do again...

Oh, and by the way, shortly after turning the engine on there was some smoke coming from under the exhaust manifold heat shiled. Both my buddy and I agreed that it was probably some oil that dripped onto it. I put in like 10 kms today and the car is running like before. Hopefully the slight oil leak will go away.

Side-note - I was quite pleased with the shape of the engine's interior! For a 12 year old machine, it's not looking too bad!

Cheers and thanks for all your help! Next stop, fuel filter change.

Last edited by Lars; 05-21-2023 at 05:59 PM.
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Old 05-21-2023, 06:48 PM   #16
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Congratulations for changing the valve cover gasket. If you do 10 of them it will be for like falling off a log!

Why are you changing the fuel filter? Just because you think it’s a good idea? My wife 2005 Camry has never had its fuel filter changed. It just hit 200,000 miles. It will never have a fuel filter changed only if something goes wrong. That’s pretty much universal agreement.

I don’t think they make a separate fuel filter for these cars. You only get a filter when you buy a new pump.

But at least it would be easier than a valve cover gasket!
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Old 05-22-2023, 01:58 PM   #17
Lars
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Originally Posted by bronsin View Post
Congratulations for changing the valve cover gasket. If you do 10 of them it will be for like falling off a log!
Thanks
Quote:
Originally Posted by bronsin View Post
Why are you changing the fuel filter? Just because you think it’s a good idea? My wife 2005 Camry has never had its fuel filter changed. It just hit 200,000 miles. It will never have a fuel filter changed only if something goes wrong. That’s pretty much universal agreement.

I don’t think they make a separate fuel filter for these cars. You only get a filter when you buy a new pump.

But at least it would be easier than a valve cover gasket!
Bit off-topic but yes, it seems they make a separate fuel filter, and I'd rather do preventive maintenance like this, at my own schedule, than have the car die on me at some random occasion. I've had a car die on me due to a dead fuel pump and it was not a fun experience. Granted, it was not a Toyota, but if replacing a fuel filter can help prevent that, I am for it. Same as the spark plugs... I'll probably be doing that next. Compared to the cover gasket thing, it's literally a walk in the park.
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Old 05-22-2023, 04:36 PM   #18
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If you can obtain a filter I guess it makes sense to change it. But most of us will tell you it is it won’t be necessary..

Ah The spark plugs!

Again my wife’s 2005 Camry this time when it had 150,000 miles. I think they’re supposed to be changed every 100,000 miles. But since the car ran perfectly I put it off until 150. I spent $40 for four new super Duper spark plugs. When I took them out they looked perfectly fine. I can’t remember what the gap was and you’re not supposed to adjust the gaps on these plugs

But if money was tight, I would’ve put them right back in! I put the new plugs in and put the old ones on a 2 x 4 beam in the shelf in the garden shed.. In case I ever need them! I have seen these kinds of plugs iridium plugs with 15,000 miles and the electrode was broken and the motor was running like crap.

One more thing. The accessory belt also had 150,000 miles on it when it was changed. I couldn’t do it my brother In law is a freelance BMW mechanic he did it. But you can buy a gate belt gauge or rather you can get one for free. I checked the old belt and it speced out new! It’s hanging on my closet door in the bedroom in case I ever need it.
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