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Write-Up needed! Trunion Upgrade

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Old Aug 29, 2010 | 11:43 PM
  #21  
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Glad to see a good write up on this cause i was wondering the same
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Old Aug 30, 2010 | 01:08 AM
  #22  
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Title change granted!
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Old Aug 30, 2010 | 01:19 AM
  #23  
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I also just pasted the link to this thread in an existing sticky (because someone was bound to ask about it sooner or later) here:

https://ls1tech.com/forums/generatio...-me-first.html
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Old Aug 30, 2010 | 01:51 AM
  #24  
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Originally Posted by garygnu
great write up.would it help any to heat the rockers up in a oven or put the trunnions in the freezer?
It's not necessary but if you want to do it, go ahead.
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Old Aug 30, 2010 | 01:52 AM
  #25  
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Why does everyone want to put parts in the oven?! Rockers, crank pulleys, headlights...LOL Set those things outside on the pavement in N. Texas and you can save the electric/gas bill a few bucks.

Last edited by orangeapeel; Aug 30, 2010 at 05:13 AM.
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Old Aug 30, 2010 | 01:53 AM
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Originally Posted by orangeapeel
Title change granted!
I'm the KING baby!!!!
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Old Aug 30, 2010 | 02:13 AM
  #27  
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Originally Posted by bene
I'm the KING baby!!!!
That's right!
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Old Aug 30, 2010 | 04:41 AM
  #28  
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Originally Posted by Squirts11
The trunion upgrade is greared towards improving rocker longevity/reliability with continual upper rpm use. It replaces the uncaged needle bearings with caged bearings, thus reducing the likelihood of finding the dreaded needle bearings when the oil is changed.
Cool. Thank you.
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Old Sep 2, 2010 | 10:15 AM
  #29  
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bene,

Thanks for the write up! I might go ahead and do this myself thanks to you

Can you post bigger pics though? Some of the pics in your write up are thumbnail size
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Old Sep 2, 2010 | 10:40 AM
  #30  
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Originally Posted by G_Loc
bene,

Thanks for the write up! I might go ahead and do this myself thanks to you

Can you post bigger pics though? Some of the pics in your write up are thumbnail size
Consider it done.
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Old Oct 31, 2010 | 08:10 PM
  #31  
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I installed my bearings over the weekend using your instructions. Thanks!

One question though, how much side to side play should the trunnions have?
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Old Apr 17, 2011 | 06:56 PM
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I'm installing the trunions now. Had 3 that felt like crap. Notchy and just rough feeling. Swapped the bearings between the 3 and now I have 14 rockers that are smooth and 2 are just plain bad and can barely get the trunion into the bearings of the bad ones.

Pm me if you have any other tips or need to do to fix this.
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Old Jul 8, 2011 | 06:33 AM
  #33  
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Originally Posted by G_Loc
I installed my bearings over the weekend using your instructions. Thanks!

One question though, how much side to side play should the trunnions have?
You should allow a little bit of slack so you will not bind the rockers when moving.
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Old Jul 10, 2011 | 08:38 PM
  #34  
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Originally Posted by G_Loc
I installed my bearings over the weekend using your instructions. Thanks!

One question though, how much side to side play should the trunnions have?
Originally Posted by bene
You should allow a little bit of slack so you will not bind the rockers when moving.
I'm in the process of installing the Comp Cam trunion kit right now ... got 1/2 of them done today. Taking my time to make sure everything is perfect and make some measurements along the way.

I measured the side-to-side play on the trunion after bearing installation per Comp Cam instructions and it comes out around 0.010" ~ 0.012". I had one that was about 0.022" and discovered the two flats on one side of the rocker arm (part of the casting) stuck up farther than the rest of the side plane of the rocker arm side where the bearing presses in. So when the bearing is pressed, it doesn't go down as far as if the two flats were even with the rest of the side of the rocker arm. I found a 15mm socket that fit nicely over the trunion and just contacted the race of the bearing and gave it a couple of taps with a small hammer to get the side-to-side play down to 0.010" ~ 0.012" as the others.

BTW ... before I disassembled the OEM rockers I measure the trunion side-to-side on them to be ~ 0.020" ... seemed kind of sloppy to me. Wonder if having less side-to-side with the new trunion kit will help quiet down the valve train at all?

I used a 1 ton arbor press (mounted to my workbench) I got at Harbor Freight for $45 to install the kit .... works great! See attached photos.
Attached Thumbnails Write-Up needed! Trunion Upgrade-dscf7241a.jpg   Write-Up needed! Trunion Upgrade-dscf7249a.jpg  

Last edited by ZeeOSix; Jul 10, 2011 at 10:24 PM.
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Old Jul 10, 2011 | 11:22 PM
  #35  
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I used the arbor press from HF as well. Works real nice.
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Old Jul 12, 2011 | 02:15 AM
  #36  
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This is how I punched out the OEM bearings (see attached photos). Drilled a 7/8" hole through a "high tech" 2x4 and set the rocker arm over the hole ... then punch out the trunion with a flat punch as shown. Flip the rocker over and use the inner race without bearings over the end of the trunion and use that with a punch to pop out the other side bearing's outer race. Worked good and the OEM bearings where easy to remove. Use of the wood block ensured no damage to the rocker arm.
Attached Thumbnails Write-Up needed! Trunion Upgrade-trunion-bearing-removal-block.jpg   Write-Up needed! Trunion Upgrade-punch-out-oem-trunion.jpg  
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Old Jul 12, 2011 | 08:00 AM
  #37  
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Originally Posted by ZeeOSix
This is how I punched out the OEM bearings (see attached photos). Drilled a 7/8" hole through a "high tech" 2x4 and set the rocker arm over the hole ... then punch out the trunion with a flat punch as shown. Flip the rocker over and use the inner race without bearings over the end of the trunion and use that with a punch to pop out the other side bearing's outer race. Worked good and the OEM bearings where easy to remove. Use of the wood block ensured no damage to the rocker arm.
Good idea.
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Old Sep 6, 2011 | 05:10 PM
  #38  
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some good write ups here. this is on my mod list when i swap cams.
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Old Sep 6, 2011 | 07:01 PM
  #39  
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Originally Posted by ZeeOSix
I'm in the process of installing the Comp Cam trunion kit right now ... got 1/2 of them done today. Taking my time to make sure everything is perfect and make some measurements along the way.

I measured the side-to-side play on the trunion after bearing installation per Comp Cam instructions and it comes out around 0.010" ~ 0.012". I had one that was about 0.022" and discovered the two flats on one side of the rocker arm (part of the casting) stuck up farther than the rest of the side plane of the rocker arm side where the bearing presses in. So when the bearing is pressed, it doesn't go down as far as if the two flats were even with the rest of the side of the rocker arm. I found a 15mm socket that fit nicely over the trunion and just contacted the race of the bearing and gave it a couple of taps with a small hammer to get the side-to-side play down to 0.010" ~ 0.012" as the others.

BTW ... before I disassembled the OEM rockers I measure the trunion side-to-side on them to be ~ 0.020" ... seemed kind of sloppy to me. Wonder if having less side-to-side with the new trunion kit will help quiet down the valve train at all?

I used a 1 ton arbor press (mounted to my workbench) I got at Harbor Freight for $45 to install the kit .... works great! See attached photos.
I bought the same press and it works fantastic. Well worth $45.
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Old Sep 7, 2011 | 05:01 AM
  #40  
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Originally Posted by Mez
I bought the same press and it works fantastic. Well worth $45.
Might have to use my 20% coupon and get one. Harbor Freight is my favorite store for these kinds of buys: where I'll only use the thing once or twice.
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