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Discussion Starter #1
I'm replacing the clutch on my 98 Corolla and am planning to replace the flywheel bolts as recommended while I have it apart. I went to the dealership and they charge $10 per bolt. Naturally, I didn't want to spend that much money so I started looking for cheaper options. I found the correct size (m10 1.25x25mm) grade 10.9 bolts at AutoZone for much cheaper, $5 per pack of three bolts.

Is grade 10.9 strong enough? I see tons of people recommending ARP, but are they stronger than the bolts I found? By how much?

I want to do it right, so I'll gladly buy ARP or something else if the 10.9 aren't strong enough. But I don't want to spend more money on other bolts if the 10.9s are sufficient.
 

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Unless you somehow managed to damage the bolts there is no reason to replace them. Clean the threads (and in the flywheel) use medium strength blue thread lock, torque to spec and you're good.
 

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I'm replacing the clutch on my 98 Corolla and am planning to replace the flywheel bolts as recommended while I have it apart. I went to the dealership and they charge $10 per bolt. Naturally, I didn't want to spend that much money so I started looking for cheaper options. I found the correct size (m10 1.25x25mm) grade 10.9 bolts at AutoZone for much cheaper, $5 per pack of three bolts.

Is grade 10.9 strong enough? I see tons of people recommending ARP, but are they stronger than the bolts I found? By how much?

I want do it right, so I'll gladly buy ARP or something else if the 10.9 aren't strong enough. But I don't want to spend more money on other bolts if the 10.9s are sufficient.


I doubt you would have problems with a 10.9 rated flywheel bolt which is basically the same as a SAE Grade 8.
A 10.9 has a tensile strength of approximately 130k lbs. ARP Flywheel bolts are closer to a metric bolt rated at 12.9

ARP offers two styles of Flywheel bolts: premium grade Pro Series, with a 200,000 psi rating and High Performance, with a 180,000 psi rating.


Only reason I went with ARP when I put new clutches in my MR2 and T100 was it was to much work to fix if something did fail even though neither of those vehicles are equipped with high rpm or torque motors.
FWIW, I use ARP bolts even on my 383 Stroker Chevy's (Hi RPM and torque):grin:



 

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Unless you somehow managed to damage the bolts there is no reason to replace them. Clean the threads (and in the flywheel) use medium strength blue thread lock, torque to spec and you're good.
I considered doing this actually. But after doing some research I saw tons of recommendations to replace the bolts for various reasons and saw posts from people saying the old bolts snapped while torquing them to spec. I'm sure the old bolts would be ok, but I'd rather replace them just to be safe.
 

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Discussion Starter #5
I'm replacing the clutch on my 98 Corolla and am planning to replace the flywheel bolts as recommended while I have it apart. I went to the dealership and they charge $10 per bolt. Naturally, I didn't want to spend that much money so I started looking for cheaper options. I found the correct size (m10 1.25x25mm) grade 10.9 bolts at AutoZone for much cheaper, $5 per pack of three bolts.

Is grade 10.9 strong enough? I see tons of people recommending ARP, but are they stronger than the bolts I found? By how much?

I want do it right, so I'll gladly buy ARP or something else if the 10.9 aren't strong enough. But I don't want to spend more money on other bolts if the 10.9s are sufficient.


I doubt you would have problems with a 10.9 rated flywheel bolt which is basically the same as a SAE Grade 8.
A 10.9 has a tensile strength of approximately 130k lbs. ARP Flywheel bolts are closer to a metric bolt rated at 12.9

ARP offers two styles of Flywheel bolts: premium grade Pro Series, with a 200,000 psi rating and High Performance, with a 180,000 psi rating.


Only reason I went with ARP when I put new clutches in my MR2 and T100 was it was to much work to fix if something did fail even though neither of those vehicles are equipped with high rpm or torque motors.
FWIW, I use ARP bolts even on my 383 Stroker Chevy's (Hi RPM and torque)<img src="http://www.toyotanation.com/forum/images/ToyotaNation_2014/smilies/tango_face_grin.png" border="0" alt="" title="Big Grin" class="inlineimg" />



This sort of aligns with my thoughts. I don't need high performance bolts because I'm not driving my little Corolla like a race car and it doesn't have high torque or anything. It has ~240k miles, I'd just like to get at least another 100k out of it.
 

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I considered doing this actually. But after doing some research I saw tons of recommendations to replace the bolts for various reasons and saw posts from people saying the old bolts snapped while torquing them to spec. I'm sure the old bolts would be ok, but I'd rather replace them just to be safe.
The factory service manual says nothing about replacing the drive plate/flywheel bolts.
 

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no need to replace flywheel bolts. On my Porsche Turbo with +400bhp, I went down to hardware store and got generic zinc-plated flanged hex bolts and it's been holding for 20-yrs now.
 
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