Measuring PR Length for Johnson 2116LSR
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Staging Lane
Joined: Jan 2021
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Measuring PR Length for Johnson 2116LSR I know this has been covered, but can't find the exact answers I'm looking for. Help me understand the best process with a solid lifter without squeezing the new head gasket and removing again. Is there a way to measure them using the hydraulic lifter? Am I safe to bolt the head down and still reuse the gasket?
ive been told you can fully torque a head down and as long as it hasnt really been heat cycled you are a ok on the head side of things. as far as gasket, i seen somewhere to use washers that are the thickness of the torqued down. with new hydraulic lifters, you can measure for proper length with the lifters in the block, even on a johnson lifter where you have a .010 preload range you have to hit. the only thing you wont be able to do is get a wipe pattern to help confirm your pushrod length is ideal.....this is where the solid lifter really comes into play.
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Staging Lane
Joined: Jan 2021
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Thanks for the replies. I didn’t even think about using washers. Another idea I had was to use the old gasket which is supposedly .051” compressed. Would it be safe to assume that the gasket thickness is close enough to advertised thickness that I could use the old one and add .004” to the measurement to get the .055” of the new gasket, or is that risky?
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Banned
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From: USA
I know this has been covered, but can't find the exact answers I'm looking for. Help me understand the best process with a solid lifter without squeezing the new head gasket and removing again. Is there a way to measure them using the hydraulic lifter? Am I safe to bolt the head down and still reuse the gasket?
Thread Starter
Staging Lane
Joined: Jan 2021
Posts: 57
Likes: 10
Banned
Joined: May 2020
Posts: 252
Likes: 84
From: USA
It is an old (easier) way to check pushrod length by using a solid lifter, but not on an LS engine (in my opinion, due to the non adjustable rockers and varying lifter plunger depths between every available type of lifter) .
You need an adjustable pushrod, and preferable (but optional) 10" caliper.
You just put the adjustable pushrod in and be very careful to not push the lifter plunger down. And on these you'll end up taking the adj pushrod out several times to get it accurate and exactly at zero lash. Then you add the desired lifter preload to the measured pushrod length. And thats the pushrod length needed.
I'm not going to offend you by covering the steps to get it on the base circle, but I'll mention it because someone else probably will if I don't.
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From: USA
Thread Starter
Staging Lane
Joined: Jan 2021
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Can you explain to me why I shouldn’t?
I guess I’m a little confused. I was thinking I needed to use a solid lifter to take preload out of the equation when checking length and then just add the .035 preload to the measurement.
It seems like it would compress the lifter as I turn the motor to check the wipe pattern on the valve.
How would you do it? Thanks again!
I guess I’m a little confused. I was thinking I needed to use a solid lifter to take preload out of the equation when checking length and then just add the .035 preload to the measurement.
It seems like it would compress the lifter as I turn the motor to check the wipe pattern on the valve.
How would you do it? Thanks again!
Banned
Joined: May 2020
Posts: 252
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From: USA
Can you explain to me why I shouldn’t?
I guess I’m a little confused. I was thinking I needed to use a solid lifter to take preload out of the equation when checking length and then just add the .035 preload to the measurement.
It seems like it would compress the lifter as I turn the motor to check the wipe pattern on the valve.
How would you do it? Thanks again!
I guess I’m a little confused. I was thinking I needed to use a solid lifter to take preload out of the equation when checking length and then just add the .035 preload to the measurement.
It seems like it would compress the lifter as I turn the motor to check the wipe pattern on the valve.
How would you do it? Thanks again!
Thread Starter
Staging Lane
Joined: Jan 2021
Posts: 57
Likes: 10
Not correct. With stock pedestal mount rockers, there is no swipe pattern adjustment. The rocker geometry/relation to valve and pushrod never changes by adjustment. These get bolted down and thats it.
It is an old (easier) way to check pushrod length by using a solid lifter, but not on an LS engine (in my opinion, due to the non adjustable rockers and varying lifter plunger depths between every available type of lifter) .
You need an adjustable pushrod, and preferable (but optional) 10" caliper.
You just put the adjustable pushrod in and be very careful to not push the lifter plunger down. And on these you'll end up taking the adj pushrod out several times to get it accurate and exactly at zero lash. Then you add the desired lifter preload to the measured pushrod length. And thats the pushrod length needed.
I'm not going to offend you by covering the steps to get it on the base circle, but I'll mention it because someone else probably will if I don't.
It is an old (easier) way to check pushrod length by using a solid lifter, but not on an LS engine (in my opinion, due to the non adjustable rockers and varying lifter plunger depths between every available type of lifter) .
You need an adjustable pushrod, and preferable (but optional) 10" caliper.
You just put the adjustable pushrod in and be very careful to not push the lifter plunger down. And on these you'll end up taking the adj pushrod out several times to get it accurate and exactly at zero lash. Then you add the desired lifter preload to the measured pushrod length. And thats the pushrod length needed.
I'm not going to offend you by covering the steps to get it on the base circle, but I'll mention it because someone else probably will if I don't.
One more question: I’ve read that some have to shim the rocker stand up. When would this be necessary?
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From: USA
Exactly the answer I was looking for, thank you! I would surely check with the lifter on the cam base circle, but don’t worry about hurting my feelings. I’m here to learn.
One more question: I’ve read that some have to shim the rocker stand up. When would this be necessary?
One more question: I’ve read that some have to shim the rocker stand up. When would this be necessary?
Stock rockers with less than .630 or so lift need to be bolted right to the rocker stand and head. No adjustment is needed.