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Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: The Critic] #5393026 04/03/20 07:53 PM
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Originally Posted by The Critic
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


Yes, plugs we're removed way before I started messing with timing. Lol, I guess I only rotated the crank 29 times. I'll rotate more till I get the colored chain links to line up with the marks. Thanks guys.

Where is the chain tensioner located?

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: mattd] #5393028 04/03/20 07:54 PM
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Originally Posted by mattd
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


Thanks Matt
smile

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5393041 04/03/20 08:11 PM
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Found this video on the 1ZZ-FE engine, I am assuming the tensioner works the same way as the 2ZR-FXE motor, and I think I know where the tensioner is located (firewall side of the motor). Anyways, I do like to know the tensioner hook does release on it's own by just turning the engine clockwise and listening for the clicks.

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5393052 04/03/20 08:25 PM
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Yes, the release mechanism is the same.


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Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5393144 04/03/20 11:50 PM
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Originally Posted by MPDano
... I know where the tensioner is located (firewall side of the motor). Anyways, I do like to know the tensioner hook does release on it's own by just turning the engine clockwise and listening for the clicks. ...
It makes sense that it is on the slack side of the chain, considering direction of rotation.

Amusingly, that tensioner apparently looks and functions almost identical to the one in my 1981 Mazda---although the chain is very different.


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Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5393294 04/04/20 08:16 AM
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You might as well go ahead and replace the PCV on the side of the block while you have the intake manifold off. I didn't look back through the thread to see if this was covered, but depending on miles, it might not be a bad idea to replace the timing chain also. I tend to be a "while I'm in here" kind of person when it comes to replacing things.


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Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5393606 04/04/20 02:24 PM
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Posting Cam Bolt Sequence and torque specs.

[Linked Image]
[Linked Image]

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5394273 04/05/20 08:41 AM
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Timing Cover Bolt sequence and torque specs. [Linked Image]

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5394383 04/05/20 10:33 AM
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Day 2. Head gasket installed and cams reinstalled and all torqued down, new Felpro seals installed. Head surface verified using a metal flat edge for any warpage. Timing all lined up. Hopefully to button it all up today and give it overnight for the RTV to cure overnight. FYI, top head needs to be removed in order to get to the head bolts.

You can also see on the old head gasket, all the raised ridges are non existent anymore. Hence, opportunity for leaks.

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Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5394388 04/05/20 10:39 AM
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Definitely a blown spot on #2, #1 and #3 wasn’t far behind. Those “raised ridges” are compressed when torquing the head down.

Were there any loose head bolts?

And JMO, it would have been wise to have the head at least resurfaced. Head gasket failures are rarely due to the gasket by itself. Usually due from head bolt torque or surface distortion, even in very small areas....not necessarily across the plane.

Last edited by mattd; 04/05/20 10:45 AM.

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Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5394597 04/05/20 02:36 PM
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Guys, need advice. Am I off by 1 tooth? Was lined up before I put the timing cover on. My only regret is I didn't put tension on the chain slack to verify before closing it up. Hate it that the tensioner is mounted on the timing chain cover. Thoughts?

[Linked Image]
[Linked Image]

Last edited by MPDano; 04/05/20 02:38 PM.
Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5394603 04/05/20 02:43 PM
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Actually, come to think about it. The colored chain links were exactly spot on when I put the chain on, so slack was on the exhaust side. I have to be correct.

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5394623 04/05/20 03:02 PM
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It looks to me you’re out of time. In your disassembly pictures the crank was at 0* and the cams were lined up. The last picture shows the cams lined up, but the crank 10* ahead of the cams.

Is that exhaust cam mark STRAIGHT up?

Edit. It’s tough to tell from those photos. Put the crank at 0 and see where the cams are.

Last edited by mattd; 04/05/20 03:06 PM.

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Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: mattd] #5394627 04/05/20 03:05 PM
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Originally Posted by mattd
It looks to me you’re out of time. In your disassembly pictures the crank was at 0* and the cams were lined up. The last picture shows the cams lined up, but the crank 10* ahead of the cams.

Is that exhaust cam mark STRAIGHT up?


Thats the way it looks to me too. Unless the camera angle is really fooling me he is a sprocket off on the crank.


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Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5394656 04/05/20 03:40 PM
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Yes, you are one tooth off. Most likely, you left slack in the chain between the intake cam and the crankshaft. I have seen this mistake before.

If you remove the crank pulley, you will find that the dot on the sprocket does not match up with the correct link on the chain.


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