Pushrod question
Seasoned HDF Member
Joined: Apr 2015
Posts: 10,060
Likes: 5,316
Being you brought it up
My good nature and all, I just figure if the elementary is that complicated, why bother, and so I erased it.
I thought it was great advice to bust out a FSM , but anyone should have thought of it.
Most anyone knows cylinders are not cut the same length.
I did not see where my advice was going to help you if you knew everything or knew nothing, so I erased it.
Simple,, being you brought up what I had posted for less than ten seconds.
My good nature and all, I just figure if the elementary is that complicated, why bother, and so I erased it.
I thought it was great advice to bust out a FSM , but anyone should have thought of it.
Most anyone knows cylinders are not cut the same length.
I did not see where my advice was going to help you if you knew everything or knew nothing, so I erased it.
Simple,, being you brought up what I had posted for less than ten seconds.
Good one!
Outstanding HDF Member
Joined: Dec 2012
Posts: 2,557
Likes: 235
From: Texas
Trust me im qualified, probably more qualified than most. Part of being a professional tech is having enough humility to ask more experienced people for their opinions, which is why I posted my question. Sorry my FSM doesnt say anything about aftermarket lifters of pushrods.
Seasoned HDF Member
Joined: Apr 2015
Posts: 10,060
Likes: 5,316
Obviously, he did not already know the answer or he wouldn't have asked the question in the first place. He was replying to a snarking answer from someone who is a pro at giving snarky answers.
Tourer
Joined: Nov 2007
Posts: 452
Likes: 93
From: Center of Kalifornia
Always a good idea to put the push rods back where came from but not something to loose sleep over. Always need to adjust the push rods when ever they are removed for any reason. You will need to read up on specifications as to adjust hot or cold motor. Hydraulic lifters have a self adjusting range but you would like to be in the middle ground. Solid lifters need to be a little more exact, and never make them too tight or you can burn a valve.
Outstanding HDF Member
Joined: Dec 2012
Posts: 2,557
Likes: 235
From: Texas
He has received a few good answers, and his shop manual should lay it out and fill in any details. And, there is always YouTube instruction videos for visual learners. If he has aftermarket push rods, he can google for instructions. I guess it is easy to assume folks have done all of that before asking on an open forum like this. I know I do.
Banned
Joined: May 2018
Posts: 4,576
Likes: 978
From: Viet Vet, crossroads
I had explained to him the FSM would be his best approach,
and that I am sure he would have already thought of that being he was overly qualified to ask the question...
Then I deleted it as I thought it was too honest an answer and I would get deducted another 10 points, for an honest answer.
SO now you all know the big secret...LOL
and that I am sure he would have already thought of that being he was overly qualified to ask the question...
Then I deleted it as I thought it was too honest an answer and I would get deducted another 10 points, for an honest answer.
SO now you all know the big secret...LOL
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Seasoned HDF Member
Joined: Dec 2005
Posts: 5,462
Likes: 619
It's not 100% necessary to re-adjust them. Measure the old and new cylinders. If the new cylinders are different you need to worry about more then pushrod adjustment. You may need to adjust head gasket thickness to keep the proper squish.
If they measure identically you can put the pushrods back in the holes they came from. Just be very careful when putting the rocker support plate back on. Tighten very slowly and evenly. It will crack if not done carefully. Once you get it down let the lifters sit for 15-30 minutes before you spin the motor over.
Personally, I would just collapse the push rods, slap the top end back together and re-adjust. It will save time.
I'm assuming this is a 107" twin cam. If it's an M8, disregard everything I said (except the squish part). I'm not familiar enough with the M8.
BTW - Shop/Service manual will not address adjustable push rods. Also, exhaust pushrods are longer than intake pushrods even for adjustables.
Zach
If they measure identically you can put the pushrods back in the holes they came from. Just be very careful when putting the rocker support plate back on. Tighten very slowly and evenly. It will crack if not done carefully. Once you get it down let the lifters sit for 15-30 minutes before you spin the motor over.
Personally, I would just collapse the push rods, slap the top end back together and re-adjust. It will save time.
I'm assuming this is a 107" twin cam. If it's an M8, disregard everything I said (except the squish part). I'm not familiar enough with the M8.
BTW - Shop/Service manual will not address adjustable push rods. Also, exhaust pushrods are longer than intake pushrods even for adjustables.
Zach
Last edited by Biggzed; Feb 21, 2019 at 02:38 PM.
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