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About to tackle Head Gasket on my 2012 CT200h tomorrow #5392121 04/02/20 07:42 PM
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MPDano Offline OP
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Hello all,

Great threads out there. Couple questions.

1. What does this mean? "they were torque to yield bolts. 36 ft lbs + 90 deg + 45 deg is the torque spec." Torque to 36 ft lbs, then 90 degrees, then 45 degrees?

2. What is rotation direction when putting the crank at TDC? Counter or clockwise?

Thanks,
Leo

Last edited by MPDano; 04/02/20 07:42 PM.
Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392127 04/02/20 07:44 PM
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Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392135 04/02/20 07:58 PM
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CR94 Online Content
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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).


2011 Toyota Prius now at 110K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392160 04/02/20 08:29 PM
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Torque to yield is just as it sounds. The bolt is torqued to say 100 ft-lbs, then turned another 90 degrees, 45 degrees, or whatever is listed in the instructions. In your case it looks like it is torqued to 36 ft-lbs, then 90 degrees, then an additional 45 degrees. This is usually the case with stretch bolts, so I'd recommend replacing the head bolts. You will need one of these gauges to help with the degrees:

https://www.amazon.com/Performance-Tool-M205-Torque-Angle/dp/B004O7WCW4/ref=sr_1_2?dchild=1&keywords=degree+gauge+3%2F8&qid=1585877361&sr=8-2


1998 Jeep Wrangler Sahara 4.0L/5MT (157k) - PHM 10w30, Wix 51085
2009 BMW 328i N51 (61k) - Liqui Moly 5w40, MANN HU816X
Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392222 04/02/20 10:06 PM
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all bolts tighten clockwise unless noted otherwise.
The TTY bolts are designed to be tightened to the point of 'elasticity' to cope with the head casting growth at operating temperature & subsequent contraction upon cooling.

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392229 04/02/20 10:19 PM
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I apologize in advance for this comment, but if you have to ask these questions you should not be performing this job yourself, for your sake and for the vehicle reliability. Do you even have any mechanical knowledge or ability?


2007 Ford F-350 4x4 6.0 PSD

ASE Master, L1, L2
Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: vw7674] #5392231 04/02/20 10:22 PM
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jeepman3071 Offline
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Originally Posted by vw7674
all bolts tighten clockwise unless noted otherwise.
The TTY bolts are designed to be tightened to the point of 'elasticity' to cope with the head casting growth at operating temperature & subsequent contraction upon cooling.


I think he is asking which way the engine rotates so he can rotate it the same way to bring the cylinders up to TDC. I would think counter clockwise, but you would want to check any service manuals to be sure what the correct way they want you to rotate it being a hybrid. Be very careful working on this vehicle due to the hybrid system.


1998 Jeep Wrangler Sahara 4.0L/5MT (157k) - PHM 10w30, Wix 51085
2009 BMW 328i N51 (61k) - Liqui Moly 5w40, MANN HU816X
Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392242 04/02/20 10:33 PM
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You're going to "tighten" the head bolts on three different and subsequent passes. You'll do all of them to 36 lb-ft (using the proper torquing sequence - usually inside to outside). Then you'll toss aside your torque wrench and rotate them all 90 degrees (again, proper sequence). Then again another 45 degrees (again, proper sequence).

Good luck and good on you for jumping in feet first. Even the most experienced person had a first time. Do your research, follow the FSM, take your time, and you'll be fine. It's not rocket surgery.

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: MPDano] #5392263 04/02/20 11:31 PM
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andyd Offline
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Torque to yield are one time use. BMW M 30 s used them. If you mark the flats, on the head bolts. and/or use a protractor.. Please dont try to re-use TTY, once they are stretched, they are too long. Kinda follows that would happen. Uhhmmn, the last head R+R was on a '99 CRV DOHC 4. No clue what your engine, the Honda rotated "wrong" would that be clock wise? I wouldn't attempt this without a manual or a PDF of a manual. An OHC timing chain and a belt has to turn 2 complete turns of the crankshaft and come back to the timing marks. Chains have to be wired in place around the crank gear or else you' have to pull the timing cover, which is a whole can of worms.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

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'16 Camry SE, Valvoline HM 0w20 and OEM filter
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Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: jeepman3071] #5392385 04/03/20 07:38 AM
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MPDano Offline OP
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Originally Posted by jeepman3071
Torque to yield is just as it sounds. The bolt is torqued to say 100 ft-lbs, then turned another 90 degrees, 45 degrees, or whatever is listed in the instructions. In your case it looks like it is torqued to 36 ft-lbs, then 90 degrees, then an additional 45 degrees. This is usually the case with stretch bolts, so I'd recommend replacing the head bolts. You will need one of these gauges to help with the degrees:

https://www.amazon.com/Performance-Tool-M205-Torque-Angle/dp/B004O7WCW4/ref=sr_1_2?dchild=1&keywords=degree+gauge+3%2F8&qid=1585877361&sr=8-2


Yes, I have a digital torque wrench. Just needed to verify the statement. Never heard of this type of procedure. Thanks for the confirmation.

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: vw7674] #5392387 04/03/20 07:39 AM
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Originally Posted by vw7674
all bolts tighten clockwise unless noted otherwise.
The TTY bolts are designed to be tightened to the point of 'elasticity' to cope with the head casting growth at operating temperature & subsequent contraction upon cooling.


Thank you.

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: mattd] #5392392 04/03/20 07:41 AM
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Originally Posted by mattd
I apologize in advance for this comment, but if you have to ask these questions you should not be performing this job yourself, for your sake and for the vehicle reliability. Do you even have any mechanical knowledge or ability?


No worries. I'm 53 and have worked on cars, motorcycles, atv's and boats since I was 16. I just didn't understand the torque to yield instructions. Anything I've worked on is torque to a specific lb and that's it, never heard of torque then turn 90, then 45, in it's pattern of course.

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: jeepman3071] #5392393 04/03/20 07:43 AM
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Originally Posted by jeepman3071
Originally Posted by vw7674
all bolts tighten clockwise unless noted otherwise.
The TTY bolts are designed to be tightened to the point of 'elasticity' to cope with the head casting growth at operating temperature & subsequent contraction upon cooling.


I think he is asking which way the engine rotates so he can rotate it the same way to bring the cylinders up to TDC. I would think counter clockwise, but you would want to check any service manuals to be sure what the correct way they want you to rotate it being a hybrid. Be very careful working on this vehicle due to the hybrid system.


Yup, exactly. I'll rotate the crank counter to get it to TDC.

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: cpayne5] #5392395 04/03/20 07:43 AM
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Originally Posted by cpayne5
You're going to "tighten" the head bolts on three different and subsequent passes. You'll do all of them to 36 lb-ft (using the proper torquing sequence - usually inside to outside). Then you'll toss aside your torque wrench and rotate them all 90 degrees (again, proper sequence). Then again another 45 degrees (again, proper sequence).

Good luck and good on you for jumping in feet first. Even the most experienced person had a first time. Do your research, follow the FSM, take your time, and you'll be fine. It's not rocket surgery.


Roger that, thank you sir.

Re: About to tackle Head Gasket on my 2012 CT200h tomorrow [Re: andyd] #5392402 04/03/20 07:47 AM
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Originally Posted by andyd
Torque to yield are one time use. BMW M 30 s used them. If you mark the flats, on the head bolts. and/or use a protractor.. Please dont try to re-use TTY, once they are stretched, they are too long. Kinda follows that would happen. Uhhmmn, the last head R+R was on a '99 CRV DOHC 4. No clue what your engine, the Honda rotated "wrong" would that be clock wise? I wouldn't attempt this without a manual or a PDF of a manual. An OHC timing chain and a belt has to turn 2 complete turns of the crankshaft and come back to the timing marks. Chains have to be wired in place around the crank gear or else you' have to pull the timing cover, which is a whole can of worms.


Yes sir. Got brand new head bolts (10) and a head gasket kit. Timing cover has to already be removed before pulling the head. I know of those can of worms. Had to re-time my Polaris RZR 1000 last month and the chain fell off the crank gear, had to remove the stator cover and stator to put it back on the gear. Not fun.

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