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Old 05-01-2011, 10:16 AM
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Rookie Mistakes

Ok... I'm a rookie to rebuilding motors, I'm a freshly trained paint/body guy... So I ventured into rebuilding my own 79' Chevy 305. I have made some rookie mistakes (hammering the harmonic balancer on, not covering the bolts on the rods when installing pistons and dinged my crankshaft, not aligning the dots on the timing chain etc.) I just did the harmonic balancer thing yesterday after I fixed the timing chain mishap and I was looking for some "seasoned" input... Should I just start from scratch?

When I dinged the crank we smoothed the journals and it turned fine... But... Yes there is a but; the guy I was getting to help me said "no need to check with plastic guage, you'll be fine I'm sure of it". He's been mechanicing for 20 years so I trusted him being I was his Service Advisor at our industrial equipment dealership and know his work first hand... I'm just weary now... So should I take it out and have it turned, and get a new set of bearings to match?

By changing the bearings it would illeviate my concerns from hammering on the harmonic balancer too right?

I have a new top end completely, but my concern's lie with the lower end and since it's such a pain to work that while in the car I have a gut feeling to pull motor again and just start from scratch...

Have I lost my marbles? Be gentle guys, remember I'm a rookie!

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Old 05-01-2011, 10:47 AM
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"No need to tear down the bottom end ....it IS ok....I'm sure of it" .
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Old 05-01-2011, 11:07 AM
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Why do I sense sarcasm in your reply?
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Old 05-01-2011, 11:12 AM
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Quote:
Originally Posted by Fergusonic
"No need to tear down the bottom end ....it IS ok....I'm sure of it" .



I really don't read any "sarcasm" in the above post he is just saying that most times when this happens everything is ok to move on with the build. Well maybe a little sarcasm . What exactly do you mean by ding the crank ? just how bad is it ? In most cases if you do happen to hit the crank going in it's not bad at all just go ahead as planed and finish putting the engine together. Every rookie makes mistakes your not the first nor the last i guarantee that. So just how bad did you hit it ?


Cole

Last edited by eloc431962; 05-01-2011 at 11:21 AM.
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Old 05-01-2011, 11:15 AM
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Quote:
Originally Posted by OKC79Monte
Why do I sense sarcasm in your reply?
LOL

Quote:
But... Yes there is a but; the guy I was getting to help me said "no need to check with plastic guage, you'll be fine I'm sure of it".?
Its not his car its yours, if you don't feel comfortable then pull it and have it checked.
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Old 05-01-2011, 11:17 AM
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Quote:
Originally Posted by Jake_Dragon
LOL



Its not his car its yours, if you don't feel comfortable then pull it and have it checked.
I do have to agree with Jake on this it is yours and if you are not at ease with it this way pull it and satisify yourself. or it might just bug the heck out of you because you didn't have it checked, Your call


Cole
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Old 05-01-2011, 11:22 AM
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It was more of a minor scratch and I didn't even know I did it until I torqued my caps and the crank wouldn't turn... After having my buddy come over he inspected the crank journals and that's when he saw them. When he smoothed it, we used a VERY VERY fine peice of of sandpaper, like 600 grit I think... Smoothed it, then took a clean cloth and did the ol' shoe shine around the journals. Once everything was installed, torqued, motor turns over fine...

I didn't even worry about it until yesterday when I finished correcting my snap-fu on the timing chain. I set the timing dots accordingly, reinstalled the timing cover, reset my lifters to "zero-lash" and then I put on the harmonic balancer with a hammer and 2x4.

After doing all of that I read a few articles online about installing the HB that way. Now it has me second guessing everything that has gone wrong due to my lack of knowledge...

Just want to get some insight on if I need to just cover my *** and redo this stuff. I would hate to start the motor after installing everything else and then figure out something is jacked-up.
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Old 05-01-2011, 11:24 AM
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Hi
Pull that thing out & take the crank to the machine shop for a check & polish.
I would not put any engine part together without checking for proper clearance. I've spent hours checking & adjusting the clearances on the crank, mains. & rods.
The bearings you were pounding on, well there cheep get new ones.
Your helper sounds like a government worker "OH that's close enough" a little loose with your money & time.
Rich
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Old 05-01-2011, 11:31 AM
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LMAO

Quote:
Your helper sounds like a government worker
Dude... I'm a government worker, Tinker AFB and a 9 year US Marine... That's freaking hilarious that you said that!

Guys... I am going to pull it and just get the reassurance... I have some $$$ tied up in the car, plus nothing else (a/c compressor, alternator, radiator, etc.) is installed at this point so pulling is just an hour job...

Thanks for everyone's insight, I really appreciate it!

Brian
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Old 05-01-2011, 11:38 AM
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Semper Fidelis Brother.
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Old 05-01-2011, 01:03 PM
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I would plastigage every bearing. I have seen too many mistakes from machine shops over the years to completely trust that their work matches the bearings that you bought ect. Think of what you were actually hammering against, the main bearing with the thrust surface. Tear it back down and recheck everything, buy a new thrust bear as mentioned.
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Old 05-01-2011, 01:11 PM
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i used a block of wood and a hammer on my hb as well, so far mine is good.
anyone who says they just slide back on is full of shi*
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Old 05-01-2011, 05:25 PM
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Quote:
Originally Posted by OKC79Monte
LMAO



Dude... I'm a government worker, Tinker AFB and a 9 year US Marine.

Brian
Thank you Brian for all that you do for us.


Cole




Quote:
Originally Posted by OKC79Monte
It was more of a minor scratch and I didn't even know I did it until I torqued my caps and the crank wouldn't turn... After having my buddy come over he inspected the crank journals and that's when he saw them. When he smoothed it, we used a VERY VERY fine peice of of sandpaper, like 600 grit I think... Smoothed it, then took a clean cloth and did the ol' shoe shine around the journals. Once everything was installed, torqued, motor turns over fine...

I didn't even worry about it until yesterday when I finished correcting my snap-fu on the timing chain. I set the timing dots accordingly, reinstalled the timing cover, reset my lifters to "zero-lash" and then I put on the harmonic balancer with a hammer and 2x4.

After doing all of that I read a few articles online about installing the HB that way. Now it has me second guessing everything that has gone wrong due to my lack of knowledge...

Just want to get some insight on if I need to just cover my *** and redo this stuff. I would hate to start the motor after installing everything else and then figure out something is jacked-up.
After reading this difinitly pull it and have everything check.

Semper Fi
Cole
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