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Old 04-25-2008, 12:38 AM
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Fresh motor wont turn over...

When I torque the rods to spec it becomes EXTREMELY tight. Changed a couple connecting rod ends around and helped a couple but still certain sets just seem to seize it up, The crank was turned 20, have 20 sized bearings, and all the bearings and such line up great, something is up with the rods hitting eachother or something, Maybe they ahve to be installed a certain direction or something? SBC gm rods.

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Old 04-25-2008, 01:01 AM
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re; fresh motor won't turn over

What do you mean, you turned a couple of the rod caps around? A cap comes off a certain rod facing a certain direction and if you change any of that, you have major problems! Maybe you should go back to square#1 and start over, or maybe I'm misinterpreting what you mean. Tom
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Old 04-25-2008, 01:07 AM
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The rod journal has a fillet or rounded corner at the edge of the crank throw and the rod/bearing also has a chamfer at one side. This chamfer must mate up with the rod journal fillet. If reversed, the rod/bearing will bind up. As far as the rod caps, the notch in the cap mates to the notch in the big end of the rod.
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Old 04-25-2008, 01:45 AM
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Quote:
Originally Posted by techinspector1
The rod journal has a fillet or rounded corner at the edge of the crank throw and the rod/bearing also has a chamfer at one side. This chamfer must mate up with the rod journal fillet. If reversed, the rod/bearing will bind up. As far as the rod caps, the notch in the cap mates to the notch in the big end of the rod.

Yeah the bearings are in there fine, and seem to spin fine until something locks it up, I did mix up the rod end caps, but they each have a bigger corner
on one side, I dont know how the best way for them to sit beside eachother.
How to mate them up, I need to get it outta the way
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Old 04-25-2008, 05:14 AM
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You cannot mix rod caps, if you have and you dont know which goes on which, the only thing you can do is remove them and have them resized or get another set of rods. This is why many builders recommend to novices to number the rods on both the rod and cap sides to assure the rod caps dont get mixed.
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Old 04-25-2008, 06:54 AM
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Quote:
Originally Posted by DoubleVision
You cannot mix rod caps, if you have and you dont know which goes on which, the only thing you can do is remove them and have them resized or get another set of rods. This is why many builders recommend to novices to number the rods on both the rod and cap sides to assure the rod caps don't get mixed.
Yes I agree totally.Double Vision knows what he is talking about.Never mix caps.No exceptions.
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Old 04-25-2008, 10:16 AM
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Theres 5 rod caps with "597" on the end, and 4 with "596" on the end.

Guess I'll just mix and match until I get it right. im not buying new
rods or paying again to have them sized. again.
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Old 04-25-2008, 10:19 AM
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You can get them figured out with some time. Get a good light and a magnifying glass and put a cap on a rod and compare the machine marks at the joint. When you find one that lines up PERFECTLY, it's a match, one down! LOL Remember that the little notches in the rod and cap go together, same side of rod.

Mark
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Old 04-25-2008, 12:03 PM
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rod caps

You cannot just mix and match the caps. If you do you will risk messing up your crank that i am sure cost you 150 or so to have ground, is that worth the risk of SB chevy rods which are a dime a dozen? I would buy new ones and go the safe route so your not cruzin somewhere someday and in the worst possible moment lock the engine up!

My 2 cents!
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Old 04-25-2008, 12:03 PM
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Quote:
Originally Posted by Jmark
You can get them figured out with some time. Get a good light and a magnifying glass and put a cap on a rod and compare the machine marks at the joint. When you find one that lines up PERFECTLY, it's a match, one down! LOL Remember that the little notches in the rod and cap go together, same side of rod.

Mark
Yeah i have that right but which way does the offset face on the rod themselves. Like the sharp edge, and the non sharp edge, people on here try to explain it and it just doesnt make sense i wish somebody could just get a pic. They are 4 valve releif pistons as well so i guess i can spin them around
180 degrees if needed depending on how theyre supposed to go. Obviously that would make the dots on the pistons not all be facing front, But guess it doesnt matter if its 4 valve releif?
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Old 04-25-2008, 12:05 PM
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Quote:
Originally Posted by wesmann2003
You cannot just mix and match the caps. If you do you will risk messing up your crank that i am sure cost you 150 or so to have ground, is that worth the risk of SB chevy rods which are a dime a dozen? I would buy new ones and go the safe route so your not cruzin somewhere someday and in the worst possible moment lock the engine up!

My 2 cents!
Actually id have to pay for getting the rods taken back off the pistons
and then put back on a new set. It would end up costing a whole
lot more, and i would rather take my chances instead of starting over.
This is already the 2nd set of rods thanks to them benig mounted on the wrong size pistons before. Dude said they were .030 over and turned out
to be standard size.
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Old 04-25-2008, 12:05 PM
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Hmm

Have you ever built a motor before? Things go certain ways for a reason, its not just slap it together, everything is engineered for a reason. I would get a nice thick book on building engines, read it, then have someone who has built a few mentor you with the tips and tricks of building one otherwise you may cost yourself alot of headaches and money!
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Old 04-25-2008, 12:56 PM
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Quote:
Originally Posted by wesmann2003
Have you ever built a motor before? Things go certain ways for a reason, its not just slap it together, everything is engineered for a reason. I would get a nice thick book on building engines, read it, then have someone who has built a few mentor you with the tips and tricks of building one otherwise you may cost yourself alot of headaches and money!
hate these kind of responses but once in a while somebody says something like that. Let me run out to the library real quick and get educated.



seriously its a simple question of putting the rods in right. Not a question
of me not being able to do a motor, honestly quit trying to make it sound
like its rocket science.



Because ITS NOT.
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Old 04-25-2008, 01:20 PM
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re; fresh motor won't turn over

Quote:
Originally Posted by DarknessSpawned
Theres 5 rod caps with "597" on the end, and 4 with "596" on the end.

Guess I'll just mix and match until I get it right. im not buying new
rods or paying again to have them sized. again.
9 rod caps?? Please don't get defensive we're only trying to help. As far as the pistons go,the dot is there for a reason,sometimes the piston is a tiny bit offset,not enough to see if you don't know what you're looking for.#2 use a strong light and a magnifier to mate the caps to the rods,they were cast as 1 piece and cut,this is major.Don't get frustrated,I know we have some members on the left coast of florida,maybe one of them would be willing to give you a hand. Tom
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Old 04-25-2008, 01:25 PM
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Quote:
Originally Posted by sprecher48
9 rod caps?? Please don't get defensive we're only trying to help. As far as the pistons go,the dot is there for a reason,sometimes the piston is a tiny bit offset,not enough to see if you don't know what you're looking for.#2 use a strong light and a magnifier to mate the caps to the rods,they were cast as 1 piece and cut,this is major.Don't get frustrated,I know we have some members on the left coast of florida,maybe one of them would be willing to give you a hand. Tom

Typo on the numbers it was 5 and 3 meant.

Im not defensive just its dumb to tell somebody to go
read a book and act like they are far to stupid to build anything.
Seriously thats what forums like these are for if I wanted to go
read the engine bible I would but i know enough to be able to
ask for help on a forum. Ive done alot of engine work of all types
just never done a ground up build. Id say out of building a whole engine
and this being one of the few problems I can just ask
somewhere and not need to be told to read some big engine
swapping book. Seriously he should have just addressed my question
if hes a master swap tech.

basically his response was retarted.
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