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Is crank shot images #3046830
05/31/22 04:37 PM
05/31/22 04:37 PM
Joined: Nov 2005
Posts: 236
Pasadena, Texas
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fal3 Offline OP
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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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Is crank shot 2 images #3046832
05/31/22 04:42 PM
05/31/22 04:42 PM
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Pasadena, Texas
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fal3 Offline OP
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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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Re: Is crank shot 2 images [Re: fal3] #3046848
05/31/22 05:24 PM
05/31/22 05:24 PM
Joined: Mar 2011
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Michigan
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Transman Offline
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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.

Re: Is crank shot 2 images [Re: Transman] #3046878
05/31/22 06:58 PM
05/31/22 06:58 PM
Joined: May 2005
Posts: 1,616
Apollo, PA.
B1MAXX Offline
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A polish will clean that right up. then new bearings.

Re: Is crank shot images [Re: fal3] #3046904
05/31/22 08:27 PM
05/31/22 08:27 PM
Joined: Jan 2003
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Moved to N.E. Tennessee
GomangoCuda Offline
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Perfect justification for a new stroker kit.


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Re: Is crank shot images [Re: GomangoCuda] #3046914
05/31/22 09:23 PM
05/31/22 09:23 PM
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Posts: 9,546
Freeport IL USA
poorboy Offline
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Freeport IL USA
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.

Re: Is crank shot images [Re: fal3] #3046916
05/31/22 09:24 PM
05/31/22 09:24 PM
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Pasadena, Texas
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fal3 Offline OP
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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.

Re: Is crank shot images [Re: poorboy] #3046934
05/31/22 10:12 PM
05/31/22 10:12 PM
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West Plains, MO
DrCharles Offline
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West Plains, MO
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

Re: Is crank shot images [Re: GomangoCuda] #3046944
05/31/22 10:35 PM
05/31/22 10:35 PM
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Omaha Ne
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TJP Offline
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Originally Posted by GomangoCuda
Perfect justification for a new stroker kit.


up

Re: Is crank shot images [Re: fal3] #3046960
06/01/22 01:40 AM
06/01/22 01:40 AM
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Bend,OR USA
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Cab_Burge Offline
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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

Last edited by Cab_Burge; 06/01/22 01:44 AM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Is crank shot images [Re: Cab_Burge] #3046965
06/01/22 05:54 AM
06/01/22 05:54 AM
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rust belt
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Moparite Offline
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rust belt
Are you posting the upper rod bearing surface(that contacts the crank) or the bottom. Also what brand bearings are they?

Re: Is crank shot images [Re: fal3] #3047143
06/01/22 03:28 PM
06/01/22 03:28 PM
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Pasadena, Texas
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fal3 Offline OP
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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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Re: Is crank shot images [Re: fal3] #3047162
06/01/22 04:16 PM
06/01/22 04:16 PM
Joined: Jan 2003
Posts: 19,797
Park Forest, IL
slantzilla Offline
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What do the bearing halves out of the rods look like? They will probably look worse.


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Re: Is crank shot images [Re: fal3] #3047208
06/01/22 06:55 PM
06/01/22 06:55 PM
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Keizer, Oregon U.S.A.
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elmor353 Offline
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Keizer, Oregon U.S.A.
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.

Re: Is crank shot images [Re: elmor353] #3047227
06/01/22 07:55 PM
06/01/22 07:55 PM
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fredericksburg,va
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cudaman1969 Offline
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fredericksburg,va
New crank time, not worth the money to fix, its used up, no more room to cut.

Re: Is crank shot images [Re: fal3] #3047235
06/01/22 08:13 PM
06/01/22 08:13 PM
Joined: Nov 2005
Posts: 236
Pasadena, Texas
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fal3 Offline OP
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Pasadena, Texas
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.

Re: Is crank shot images [Re: fal3] #3047297
06/02/22 06:58 AM
06/02/22 06:58 AM
Joined: May 2005
Posts: 1,616
Apollo, PA.
B1MAXX Offline
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A polish will fix way worse than that, around 75 bucks around here.







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