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Is crank shot images

Posted By: fal3

Is crank shot images - 05/31/22 09:37 PM

Short story- carb float stuck open; washed engine down. All connecting rods loose; cylinders 6/8 were worst. Images are of the connecting rod cap; bearing inside/outside; crank connecting rod journal for cylinders 6/8. The main bearing caps are tight. Crank was turned about 1/4 rotation to make removal of connecting rod cap for cylinder 8. Did not need lot of effort to turn it, but then again, I'm not an expert.

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Posted By: fal3

Is crank shot 2 images - 05/31/22 09:42 PM

A continuation. Thanks ahead for advice/suggestions. Oh, might be important: re-built in Fall'98; has 25,000 miles. Connecting rod journals grind .040; main journals grind .030 on re-build.

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Posted By: A727Tflite

Re: Is crank shot 2 images - 05/31/22 10:24 PM

Originally Posted by fal3
A continuation. Thanks ahead for advice/suggestions. Oh, might be important: re-built in Fall'98; has 25,000 miles. Connecting rod journals grind .040; main journals grind .030 on re-build.


Lose the pictures of the rod and cap without the bearings.

Show #7 and 8 rod bearings.
Posted By: B1MAXX

Re: Is crank shot 2 images - 05/31/22 11:58 PM

A polish will clean that right up. then new bearings.
Posted By: GomangoCuda

Re: Is crank shot images - 06/01/22 01:27 AM

Perfect justification for a new stroker kit.
Posted By: poorboy

Re: Is crank shot images - 06/01/22 02:23 AM

The only Crankshaft I ever broke was turned .030 on the rods & mains.

You have one that has been turned .030 and .040 and is damaged. A polish might make it useable, but how hard are you going to use it? Have you looked at all the other journals on the crank? What are you intending to do with the rods that were on that crank journal?

If it was mine, there would be a different crank installed.
Posted By: fal3

Re: Is crank shot images - 06/01/22 02:24 AM

The photos are #8. I see my error about confusing #6 with #7. I'll remove #7 cap; take images; post.
Thanks for the info guys. I'm relieved to see that connecting rod journals can be salvage. Feeling hopeful about situation.
Posted By: DrCharles

Re: Is crank shot images - 06/01/22 03:12 AM

Originally Posted by poorboy
The only Crankshaft I ever broke was turned .030 on the rods & mains.

It's hard to conclude anything useful from a sample size of 1 whistling Couldn't it be equally likely that that crank had a LOT of hard use, having been turned down three times?

What about turning the rod journal down for a 2.100 Chevy rod? Those engines don't seem to break cranks constantly work
Posted By: TJP

Re: Is crank shot images - 06/01/22 03:35 AM

Originally Posted by GomangoCuda
Perfect justification for a new stroker kit.


up
Posted By: Cab_Burge

Re: Is crank shot images - 06/01/22 06:40 AM

Measure twice (rods I.D., all 8, and all crank journals) before deciding wrench twocents scope up
I would think about having that crank offset ground down to BB Chevy rod journal size and increase the stroke and use a new set of H beam 7.100 long rods and piston made to match your desire results on compression and ring sizes. Why not go big now work twocents
Posted By: Moparite

Re: Is crank shot images - 06/01/22 10:54 AM

Are you posting the upper rod bearing surface(that contacts the crank) or the bottom. Also what brand bearings are they?
Posted By: fal3

Re: Is crank shot images - 06/01/22 08:28 PM

Images of #7/8 journal; #7 bearing. Bearings shown are from the connecting rod cap(?). Lower connecting rod? Thanks again for everybody's input.

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Posted By: slantzilla

Re: Is crank shot images - 06/01/22 09:16 PM

What do the bearing halves out of the rods look like? They will probably look worse.
Posted By: elmor353

Re: Is crank shot images - 06/01/22 11:55 PM

Is that journal the worst of them? If so, you may be able to have it polished, put new bearings in it and run it. Did it spin any bearings? If it did, you are looking at having the rods resized, otherwise I would measure the inside of the rod and if it's in spec use them.
Posted By: cudaman1969

Re: Is crank shot images - 06/02/22 12:55 AM

New crank time, not worth the money to fix, its used up, no more room to cut.
Posted By: fal3

Re: Is crank shot images - 06/02/22 01:13 AM

Elmore 353: I only checked #7/8 connecting rods b/c they were the most loose. My thinking was if 7/8 journal was the worst, then the others would be repairable.
Cudamann: I was leaning towards your thinking, but not knowledgeable enough about cranks, so I figured let me see what experienced people have to say.
Engine is getting dropped-off at an engine builder who has down some engine work for me before.
Posted By: B1MAXX

Re: Is crank shot images - 06/02/22 11:58 AM

A polish will fix way worse than that, around 75 bucks around here.
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