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The question, initially posted May 23, 2005, was:
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What did you get done on your Bolt today????


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Re: What next? Engine break in completed.
Lugnutz #1430774 Sat Nov 20 2021 03:37 PM
Joined: Feb 2004
Posts: 24,250
H
Kettle Custodian (pot stirrer)
The engine would need to be at least idling to get an idea of proper rotation of the pushrods. The lifter preload is right- - - -DO NOT overthink this and start doing any unnecessary tinkering! Remember that the pushrods are not mechanically linked to the lifters- - - -the offset of the lifter to the cam lobe makes it spin, and it may or may not transfer that spin to the pushrod. If you're that concerned about pushrod rotation, align those dots again, disable the ignition, and spin the engine with the starter for 15 seconds or so.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Re: What next? Engine break in completed.
Lugnutz #1430776 Sat Nov 20 2021 03:41 PM
Joined: Sep 2011
Posts: 2,511
L
Lugnutz Offline OP
'Bolter
Very slight bend in #5 exhaust pushrod (left). Rats.

Attached Files
image.jpg (101.12 KB, 114 downloads)
Re: What next? Engine break in completed.
Lugnutz #1430779 Sat Nov 20 2021 03:45 PM
Joined: Feb 2004
Posts: 24,250
H
Kettle Custodian (pot stirrer)
Were those new pushrods, or did you re-use them from the previous buildup without checking for straightness? Check them by rolling them on a piece of glass.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Re: What next? Engine break in completed.
Hotrod Lincoln #1430780 Sat Nov 20 2021 03:47 PM
Joined: Sep 2011
Posts: 2,511
L
Lugnutz Offline OP
'Bolter
New

Re: What next? Engine break in completed.
Lugnutz #1430784 Sat Nov 20 2021 04:05 PM
Joined: Sep 2011
Posts: 2,511
L
Lugnutz Offline OP
'Bolter
I installed a spare STRAIGHT 283 pushrod in #5 exhaust. Then confirmed proper installation in the lifter with a bore scope. Notice how the straight rod has almost zero clearance as it passes through the head? That’s exactly what the bent pushrod looked like, which is why I pulled it out. I suspected it was bent.

Attached Files
069794D3-0326-4F19-855D-DF02C547D614.jpeg (192.55 KB, 111 downloads)
3B76A8CD-7F36-4A25-B1C5-904E7FAF95FA.jpeg (218.16 KB, 112 downloads)
BBCCED11-1A82-4954-82CC-8115CBD7A8FC.jpeg (208.55 KB, 108 downloads)
Last edited by Lugnutz; Sat Nov 20 2021 04:09 PM.
Re: What next? Engine break in completed.
Lugnutz #1430785 Sat Nov 20 2021 04:06 PM
Joined: Feb 2004
Posts: 24,250
H
Kettle Custodian (pot stirrer)
I can't imagine that bend was the result of anything you did during assembly or run-in. Chances are it was defective from the beginning. I always check things like that in the process of an engine buildup, even with brand new parts. Bummer!

When we would install large diameter heavy duty pushrods on the race engines, we always opened up the holes in the head for extra clearance. We also used screw-in rocker studs and pushrod guide plates. None of that is really needed on a street engine, however. The holes in the heads with stamped steel rocker arms keep the rocker tip aligned with the valve stem, so a little pushrod/head contact isn't a problem. The pushrod is hardened, so rubbing on the head occasionally doesn't do any damage.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Re: What next? Engine break in completed.
Lugnutz #1430787 Sat Nov 20 2021 04:09 PM
Joined: Sep 2011
Posts: 2,511
L
Lugnutz Offline OP
'Bolter
Maybe I had it too tight?

Re: What next? Engine break in completed.
Lugnutz #1430789 Sat Nov 20 2021 04:16 PM
Joined: Feb 2004
Posts: 24,250
H
Kettle Custodian (pot stirrer)
Not unless you had it tight enough for the valve to hit a piston, which would have also bent the valve. You just got a defective new pushrod. Since it's virtually impossible to buy single pushrods, just pick out a straight used one and press on. Some professional level parts stores such as NAPA sell replacement pushrods in sets of two if you're going to insist on "everything new". If you're going to store the engine for some time, loosen up ALL the rocker arms to keep the valves closed and prevent humidity from rusting the cylinders with valves open.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Re: What next? Engine break in completed.
Lugnutz #1430877 Sun Nov 21 2021 03:19 PM
Joined: Feb 2000
Posts: 4,439
J
'Bolter
Rotation of the push rods is a good way to check for a healthy camshaft, but it's not a 100% accurate when not running. If the engine was idling, you would probably see all 16 rotating. Cams can fail at anytime, but most do it relatively quick when things go bad. I have seen them go in 10 minutes, 200 miles, and six months later, just depends on the parts. If the lash checks good, and no noise was heard while running, precede as everything is good to go. The only true way check it out is pull it back apart, but most are not willing to do that, I wouldn't.

One could always put it back on the test stand and run it for awhile if the truck isn't ready for it yet.

Re: What next? Engine break in completed.
Lugnutz #1430913 Sun Nov 21 2021 10:15 PM
Joined: Sep 2011
Posts: 2,511
L
Lugnutz Offline OP
'Bolter
**** MYSTERY OF THE BENT PUSH ROD ****

****** SOLVED ******

I’ll get to the bottom line.

It was caused by an intake manifold bolt that was TOO LONG! The #5 exhaust push rod was in constant contact with the end of the circled manifold bolt.

Same was true with #4 exhaust pushrod, but not enough to bend it.

If you like stories that are bizarre, this might rank high on your list.

Lifters and rocker lash were set by me BEFORE the intake was bolted on.
Everything seemed fine.
I bought intake bolts on eBay. Nice grade 8 bolts with 12 point heads.
One of the bolts stripped the threads in the head. Rats!!!!

Frustrated and not wanting mismatched bolt heads, I went to the hardware store and bought grade 5 hex head bolts. Made sure they were a little longer so I’d capture the threads where the other one had stripped out.

Pulled the intake off because I hadn’t installed the rear seal correctly. Used RTV up front and at the rear this next time. Worked great. Installed the new (longer) intake bolts.

Run stand break in went fine.

Being extra thorough, I decided to check for loose rockers. Found a bent #5 exhaust pushrod. Hmmm?!?! But why? I also noticed that the rod wanted to lay firmly against the hole in the head that it passes through. But why? All the other pushrods were centered in their holes. Hmmm??

Completely removed the #5 exhaust rocker and noticed I couldn’t hand turn the pushrod WITH THE ROCKER OFF. The pushrod still wanted to sit eccentric in the pushrod hole in the head.

I decided to drill the hole in the head to 7/16”. That went well. Shavings were easily retrieved with an antenna magnet. You can scold me later. Let me finish the story.
Now I could spin the pushrod by hand, but barely. Hmmm?

Then I managed to get the antenna magnet stuck on the lifter. Yep. Tears flowed as I realized the #5 lifter was up and COMPLETELY OUT of the lifter bore. Oh crud. More on this at the end.

Out came the bore scope. Shoved the bore scope down the #5 INTAKE pushrod hole so I could hopefully guide the lifter back where it belonged and then ALL BECAME CLEAR!!! Eureka!!!!

It was staring me in the face. Bolt threads of the intake bolt just above the #5 exhaust were staring at me. I had already galled them quite a bit with my 7/16” drill bit, but there was no doubt it was the cause of my bent pushrod.

Pulled the bolt and chopped it shorter. Did the same with the bolt right above the #4 exhaust pushrod on the other side. EVERYTHING checks out OK now.

I’ll wait for Jerry to say he’s seen this happen before.

Part 2.

Yes, after 1/2 hr of surgically precise work, through the pushrod hole no less, I was able to maneuver the lifter back into the lifter bore. Right side up no less!! I could see what I was doing using the bore scope, so technically it was arthroscopic surgery! Haha!

Can you imaging how miserable it would have been trying to diagnose this problem AFTER it was in the truck and started to miss or worse?

Be nice guys and gals. I’m telling this story with humble pie in my mouth with a second helping of eating crow for dessert. I thought you’d like a good story, but please give me credit for being thorough.

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Last edited by Lugnutz; Mon Nov 22 2021 12:48 AM.
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