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TTY Bolts (Torque To Yield Bolts)?? 

 

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 Post subject: TTY Bolts (Torque To Yield Bolts)??
Posted: Wed May 30, 2012 10:36 pm 
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Hey guys was reading somewhere online the other day about I will need to replace me flywheel bolts since they are torque to yield bolts, just wondering what other bolts that are TTY, like Rocker Gear Bolts etc for example, belt tensioner?

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 Post subject: Re: TTY Bolts (Torque To Yield Bolts)??
Posted: Wed May 30, 2012 10:51 pm 
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head bolts mate. Flywheel are not TTY bolts. I have reused them time and again no issues.

There are not any other TTY bolts external on the E series motors.

 

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 Post subject: Re: TTY Bolts (Torque To Yield Bolts)??
Posted: Thu May 31, 2012 9:12 am 
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oh awesome, so pretty much head and rocker gear bolts then hey?

 

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 Post subject: Re: TTY Bolts (Torque To Yield Bolts)??
Posted: Thu May 31, 2012 11:03 am 
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oze-ford wrote:
oh awesome, so pretty much head and rocker gear bolts then hey?


no, just head bolts are tty....
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 Post subject: Re: TTY Bolts (Torque To Yield Bolts)??
Posted: Thu May 31, 2012 11:28 am 
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oh ok cool then no need to buy new ones.

 

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 Post subject: Re: TTY Bolts (Torque To Yield Bolts)??
Posted: Thu May 31, 2012 12:31 pm 
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oze-ford wrote:
oh awesome, so pretty much head and rocker gear bolts then hey?


The rocker gear bolts are NOT TTY they can be used many times, only the cylinder head bolts are.
I always inspect any bolt I use and if it's damaged, I'll replace it, but the only TTY bolts are the head bolts.

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 Post subject: Re: TTY Bolts (Torque To Yield Bolts)??
Posted: Thu May 31, 2012 3:37 pm 
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ok cool, may have to change my belt tensioner bolts has they are abit corroded.

 

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 Post subject: Re: TTY Bolts (Torque To Yield Bolts)??
Posted: Sat Jun 02, 2012 7:34 pm 
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Taken from an ACL catalogue;

ADVANTAGES OF TORQUE-TO-YIELD (TTY) BOLTS
1. Reduced frictional variations in the bolt-up procedure
2. Allowance for uncontrolled slight discrepancies in the final bolt position on fitment
3. Maintenance of constant clamp load during warm-up and running conditions
REUSE OF TORQUE-TO-YIELD (TTY) BOLTS
Torque-to-yield (TTY) bolts are also commonly known as stretch bolts because they are tightened
beyond their material elastic range and thus permanently stretched. Consequently, there is a risk of
bolt breakage if reused as the reliability of these bolts are reduced once stretched.
RECOMMENDED TORQUE-TO-YIELD (TTY) BOLT-DOWN FITMENT STEPS
1. Use new bolts.
2. Ensure the bolt holes are clean by running a tap through the threads. Ensure that blind holes
are empty.
3. Apply a light film of engine oil to the underside of bolt heads, and bolt
threads. If the bolts enter waterways, use a non-hardening sealant on
the threads.
4. Use a calibrated torque wrench. Even on torque-to-yield bolts, the initial
torque is important, as any error at this stage will transfer to the final setting.
5. Use an angle plate. Guessing degrees by eye is grossly inaccurate.

 

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