FZJ80 Valve Cover Gasket Job (1 Viewer)

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Hey Dudes,

My buddy Sean and I have another video for you. If you have a leaking valve cover gasket on your 1FZ-FE engine, this video will show you how to replace it along with other associated parts like the spark plug tube seals, PCV valve and grommet, a couple vent hoses, throttle body gasket and either resealing the 2 half moons on the head or replacing them.

The one thing we want to hit home with this job is the Toyota FSM specifies a 15 ft-lb torque value for the 13 valve cover bolts and we believe this is too high. We did do a test to figure out how much force was required to remove one of the bolts and that value was 170 in-lbs. So, it sort of appeared the 15 ft-lb spec was accurate. But, when we got to around 160 in-lbs or 13 ft-lbs, I started to cringe that going any further would have potentially broken one of the bolts in the head. Doing some research on this subject, I found a couple threads on this forum with people having the same concern that the FSM spec of 15 ft-lbs is too high. After getting the bolts to 160 in-lbs, I did do one final pass with a standard length 3/8" ratchet and was able to turn some of the bolts a tiny bit more without feeling like I was using too much force based off the size of the bolts. So, please use your own judgement when tightening down these valve cover bolts. The main thing you want to do is make sure you tighten them down evenly in a crossing pattern and gradually bring them up to the spec you feel comfortable with.

Here's the video and Enjoy the Show!

 

Onur

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Regarding the 90105-06221 valve cover bolts: Whenever I have a "this doesn't seem correct" correlation between what the technical documentation and my "hand experience" (turning the wrench)-- especially with hardware, I always refer to cross-referencing material. Saves ya every time because these values are universal across the entire Toyota technical multi-verse.

Screen Shot 2020-07-15 at 16.51.40.png
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Help us out, Onur.
Based on the pages you shared, is the FSM spec higher than it should be? If so, what did it recommend for the valve cover bolts?
Thanks.
 

Onur

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Help us out, Onur.
Based on the pages you shared, is the FSM spec higher than it should be? If so, what did it recommend for the valve cover bolts?
Thanks.

I don't have one in my hand to confirm the head marking. So, unfortunately, I don't have that memorized.
 

Onur

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But I will make an educated guess.

90105-06221 is a M6x1.0 Hexagon flange head bolt. Probably no markings.

That means it's a Class 4T. So that would equate to 52 in-lbf. Or, 4.3ft-lbs

That's my educated guess without seeing the bolt and confirming torque specifications.
 
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Regarding the 90105-06221 valve cover bolts: Whenever I have a "this doesn't seem correct" correlation between what the technical documentation and my "hand experience" (turning the wrench)-- especially with hardware, I always refer to cross-referencing material. Saves ya every time because these values are universal across the entire Toyota technical multi-verse.

View attachment 2372926View attachment 2372927

This is an excellent point and I wish I would have remembered the Toyota FSM has these charts available. My buddy Jordan shared this with me a couple years ago but it slipped my mind. I could have compared the bolt to the chart and come up with an accurate torque value based off the size and markings on the bolt. Thanks for the reminder.
 
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But I will make an educated guess.

90105-06221 is a M6x1.0 Hexagon flange head bolt. Probably no markings.

That means it's a Class 4T. So that would equate to 52 in-lbf. Or, 4.3ft-lbs

That's my educated guess without seeing the bolt and confirming torque specifications.

I believe the valve cover bolts for the 1FZ-FE engine are the same size as the valve cover bolts on the 5VZ-FE engine and I know the 5VZ-FE bolts have a torque value of 53 inch pounds so this would make sense. The 1FZ-FE VC bolts however don't have a rubberized washer like the 5VZ-FE VC bolts have, so I don't know if this makes a difference. Honestly, 53 inch pounds is next to nothing tightness wise. When doing the job, 150 inch pounds didn't feel like too much but know I'm wondering if we got lucky not braking a bolt off in the head.
 

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