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Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392411 04/03/20 07:56 AM
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MPDano Offline OP
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Here is the head bolt sequence and timing marks if anyone finds this thread and needs to do the same.

[Linked Image]
[Linked Image]

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: CR94] #5392420 04/03/20 08:04 AM
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MPDano Offline OP
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Originally Posted by CR94
Good luck! How many miles on it?

I dread this issue, and don't have suitable facilities to attack it myself (although I did successfully perform a head transplant on the much simpler engine of my Mazda).


148k. Apparently a known issue on this model Prius/Lexus engine. Hybrid especially since it starts and stops multiple times. Done a few head gaskets in my days, just never on a newer hybrid. My first head gasket was on my 1st car when I was 16. 1976 Triumph TR7, it was always blowing head gaskets. A lot easier to work with a carbureted engine.

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392465 04/03/20 08:45 AM
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cpayne5 Offline
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Make sure you have that 10mm bi-hex bit. Please don't try to use a triple square or any other tool that "might" work. smile

The bi-hexagon bit is what you need.

Here's a cheap one on Amazon.
https://www.amazon.com/CTA-Tools-92...olt+socket&qid=1585921238&sr=8-4

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392570 04/03/20 10:44 AM
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Went to Oreillys to get the proper head bolt tools. $14 total

[Linked Image]
[Linked Image]

Last edited by MPDano; 04/03/20 10:44 AM.
Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392601 04/03/20 11:24 AM
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The Critic Offline
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Originally Posted by MPDano
Went to Oreillys to get the proper head bolt tools. $14 total

[Linked Image]
[Linked Image]

Technically, those are not the correct sockets but they will usually work.

Crankshaft rotates CLOCKWISE on this engine, not CCW.

You will need another person to help you with reinstalling the timing cover, so I would plan on having someone around for that part of the process. Make sure the surfaces are surgically clean with zero debris remaining before applying RTV. The RTV needs to be applied in a bead (3mm thickness is what I target). Use FIPG Black.

Also, leave the exhaust manifold bolted to the head. Disconnect the manifold at the donut. It is much easier to do it this way than to unbolt the exhaust manifold in-car.

Last edited by The Critic; 04/03/20 11:33 AM.

2011 Toyota Prius 1.8L - 207K - Valvoline Premium Blue Restore 10W-30
2007 Honda Accord 2.4L - 146K - Valvoline Premium Blue Restore 10W-30
Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392621 04/03/20 11:47 AM
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cpayne5 Offline
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Yeah, that's a triple square, not bi-hexagon. The angles on the points are different and therefore contact the fastener differently. I've heard of people using them, but the last thing I'd want is a stripped headbolt.

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: cpayne5] #5392663 04/03/20 12:51 PM
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The Critic Offline
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Originally Posted by cpayne5
Yeah, that's a triple square, not bi-hexagon. The angles on the points are different and therefore contact the fastener differently. I've heard of people using them, but the last thing I'd want is a stripped headbolt.


Agreed, but usually the triple-square works.

I grabbed the bi-hex from my toolbox and attached a picture below. The differences are minimal.

FD900118-235E-4718-B481-227C81ACD2DE.jpeg
Last edited by The Critic; 04/03/20 12:55 PM.

2011 Toyota Prius 1.8L - 207K - Valvoline Premium Blue Restore 10W-30
2007 Honda Accord 2.4L - 146K - Valvoline Premium Blue Restore 10W-30
Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392729 04/03/20 02:00 PM
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cpayne5 Offline
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I've got the Snap-On (SADM10E for anyone that cares) one, too. Snap-On had a nice PDF that explained why everyone needed to buy their new $30 bit when they first introduced it. It comes down to the angles and the subsequent contact surfaces between the fastener and the bit.

Happy to hear that there's not much chance of stripping the headbolt using a 12mm triplesquare. thumbsup

[Linked Image]

Last edited by cpayne5; 04/03/20 02:02 PM.
Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: The Critic] #5392802 04/03/20 03:25 PM
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MPDano Offline OP
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Originally Posted by The Critic
Originally Posted by MPDano
Went to Oreillys to get the proper head bolt tools. $14 total

[Linked Image]
[Linked Image]

Technically, those are not the correct sockets but they will usually work.

Crankshaft rotates CLOCKWISE on this engine, not CCW.

You will need another person to help you with reinstalling the timing cover, so I would plan on having someone around for that part of the process. Make sure the surfaces are surgically clean with zero debris remaining before applying RTV. The RTV needs to be applied in a bead (3mm thickness is what I target). Use FIPG Black.

Also, leave the exhaust manifold bolted to the head. Disconnect the manifold at the donut. It is much easier to do it this way than to unbolt the exhaust manifold in-car.


Yes, didn't even notice the Triple Square until I posted the picture. Seems to fit perfectly and the torque level isn't that high, hopefully.

Question, do I have to remove the Harmonic Balancer to remove the timing cover?

Also, do I have to remove the cams or can it come out with both upper/lower heads attached?

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392825 04/03/20 03:47 PM
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mk378 Offline
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On a DOHC the head bolts will be somewhere underneath the camshafts, you almost always have to remove them to reach the bolts.

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392830 04/03/20 03:51 PM
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The Critic Offline
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Originally Posted by MPDano


Question, do I have to remove the Harmonic Balancer to remove the timing cover?

Also, do I have to remove the cams or can it come out with both upper/lower heads attached?

Yes, the harmonic balancer must be removed in order to remove the timing cover. If the balancer is stuck, there are two threaded holes that you can use. I think they take M8x1.25 bolts, but please do not quote me on that...

The camshafts can stay in the cam housing, but best practice is to remove them. But you do need to remove the cam housing in order to access the head bolts.


2011 Toyota Prius 1.8L - 207K - Valvoline Premium Blue Restore 10W-30
2007 Honda Accord 2.4L - 146K - Valvoline Premium Blue Restore 10W-30
Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5393002 04/03/20 07:29 PM
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MPDano Offline OP
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Ok, done for the day. Getting too old for this kind of work, laying on the engine, climbing under the car, lol. Anyways, only thing left is to remove the harmonic balancer, timing cover and cams. Then should be ready for the head pull.

Question, looks like someone was in the timing. Marks all line up but the chain link colors aren't on the marks. Turned the motor multiple times to verify. Can someone verify I am TDC? [Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5393008 04/03/20 07:35 PM
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They will almost never line up after you spin the engine over for the first time. It takes many revolutions to get the links to line up with the marks. They are for installation more or less. As long as the marks line up their positions in the FSM then you should be fine. It would be wise to mark each cam gear, crank gear and chains on their timing marks for quicker assembly. Your timing marks appear to be in the correct position

Last edited by mattd; 04/03/20 07:38 PM.

2007 Ford F-350 4x4 6.0 PSD

ASE Master, L1, L2
Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5393009 04/03/20 07:35 PM
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The Critic Offline
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All of those marks and the rtv on the timing cover seams are factory. No one has opened this engine before.

You may be in time, but I highly recommend turning the crank until the colored links line up with the marks. Especially if it’s your first time doing a job of this nature. It may take 30 or more revolutions but the marks will eventually line up. Removing the spark plugs will make this process a lot easier.

https://youtu.be/9UWD2iNXSQ4

Last edited by The Critic; 04/03/20 07:39 PM.

2011 Toyota Prius 1.8L - 207K - Valvoline Premium Blue Restore 10W-30
2007 Honda Accord 2.4L - 146K - Valvoline Premium Blue Restore 10W-30
Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5393024 04/03/20 07:50 PM
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MPDano Offline OP
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Video on removing cams I found. Now to find out where he removed the tensioner.


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