Engine Rebuild - Lifter/Rocker Reinstallation - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

dip_fartson · 01-18-2023, 06:10 PM

Overly ambitious noob here attempting to rebuild my motor after spinning a bearing...

In preparation to get the heads resurfaced and washed, the machine shop told me I needed to remove the cams, lifters, and rockers before drop-off. Unfortunately, I didn't take note of which lifters/rockers were paired or their original position on the heads.

Can the lifters/rockers be reinstalled in any order as long as the valve clearances are within spec?

NoHaveMSG · 01-18-2023, 06:28 PM

Yes.

In theory, you keep the same lifters with the same rockers since they wear together. Not really a big deal though.

blsfrs · 01-18-2023, 10:24 PM

As I understand it, the valve clearance is determined by the cap on top of the valve and the FA20 doesn't have much room for error. When I needed engine work done, I paid a professional. My wallet is lighter but my sanity is (mostly) intact.

NoHaveMSG · 01-19-2023, 12:16 PM

Quote:

Originally Posted by blsfrs

As I understand it, the valve clearance is determined by the cap on top of the valve and the FA20 doesn't have much room for error. When I needed engine work done, I paid a professional. My wallet is lighter but my sanity is (mostly) intact.

Valve lash is adjusted through with the shim , but any change in the valve train between the head and cam can cause the lash to be different.

blsfrs · 01-20-2023, 11:46 AM

Quote:

Originally Posted by NoHaveMSG

Valve lash is adjusted through with the shim , but any change in the valve train between the head and cam can cause the lash to be different.

Thank you for finishing my thought.

dip_fartson · 01-20-2023, 12:45 PM

I appreciate the input.

I suppose wear is relevant a factor. The parts have a little over 80k miles, which I think is fairly evident on the lifters:

https://pasteboard.co/3R01neYfzczQ.jpg
https://pasteboard.co/OExyGdp9WTu1.jpg

Is that an excessive amount of wear in your opinion?

I've gotten mixed responses about this on- and off-line. I'm leaning towards replacing all lifters/rockers just to be safe.

NoHaveMSG · 01-20-2023, 01:18 PM

Quote:

Originally Posted by dip_fartson

I appreciate the input.

I suppose wear is relevant a factor. The parts have a little over 80k miles, which I think is fairly evident on the lifters:

https://pasteboard.co/3R01neYfzczQ.jpg
https://pasteboard.co/OExyGdp9WTu1.jpg

Is that an excessive amount of wear in your opinion?

I've gotten mixed responses about this on- and off-line. I'm leaning towards replacing all lifters/rockers just to be safe.

It's really difficult to tell with a picture. As long as there is no obvious damage I wouldn't be afraid to run it. I would check check the rollers and make sure they feel okay, no rough spots when turned or excessive play.

NoHaveMSG · 01-20-2023, 02:59 PM

Quote:

Originally Posted by blsfrs

Thank you for finishing my thought.

lol sorry. I am a bit OCD about an incomplete thought.

blsfrs · 01-21-2023, 11:14 AM

Quote:

Originally Posted by dip_fartson

I appreciate the input.

I suppose wear is relevant a factor. The parts have a little over 80k miles, which I think is fairly evident on the lifters:

https://pasteboard.co/3R01neYfzczQ.jpg
https://pasteboard.co/OExyGdp9WTu1.jpg

Is that an excessive amount of wear in your opinion?

I've gotten mixed responses about this on- and off-line. I'm leaning towards replacing all lifters/rockers just to be safe.

Wear on some components does not seem to be an issue. When my engine was professionally rebuilt with 90k miles, many parts were reused. Rocker arms, pivots, cams, timing chains, etc.

01-18-2023, 06:10 PM	#1
dip_fartson Junior Member Join Date: Jan 2023 Drives: 2017 BRZ w/ PP Location: TX Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Engine Rebuild - Lifter/Rocker Reinstallation Overly ambitious noob here attempting to rebuild my motor after spinning a bearing... In preparation to get the heads resurfaced and washed, the machine shop told me I needed to remove the cams, lifters, and rockers before drop-off. Unfortunately, I didn't take note of which lifters/rockers were paired or their original position on the heads. Can the lifters/rockers be reinstalled in any order as long as the valve clearances are within spec?

01-20-2023, 12:45 PM	#6
dip_fartson Junior Member Join Date: Jan 2023 Drives: 2017 BRZ w/ PP Location: TX Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I appreciate the input. I suppose wear is relevant a factor. The parts have a little over 80k miles, which I think is fairly evident on the lifters: https://pasteboard.co/3R01neYfzczQ.jpg https://pasteboard.co/OExyGdp9WTu1.jpg Is that an excessive amount of wear in your opinion? I've gotten mixed responses about this on- and off-line. I'm leaning towards replacing all lifters/rockers just to be safe. Last edited by dip_fartson; 01-20-2023 at 12:49 PM. Reason: Images didn't appear in post

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blsfrs Senior Member Join Date: Dec 2018 Drives: 2013 frs base Location: central Virginia Posts: 1,440 Thanks: 2,684 Thanked 1,442 Times in 685 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	As I understand it, the valve clearance is determined by the cap on top of the valve and the FA20 doesn't have much room for error. When I needed engine work done, I paid a professional. My wallet is lighter but my sanity is (mostly) intact.

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