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Old 16-01-2011, 10:50 PM   #1
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Regrind?

Can anyone advise whether this journal is usuable, or whether it should be reground. Other than the slight pitting shown (it's not deep, but you can detect it with your fingernail), it's in good order and measures within spec.



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Matt
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Old 16-01-2011, 11:11 PM   #2
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What crank is it Matt? I've rebuilt many engines where the journals were not perfect and the owner wouldn't shell out for a new crank or re grind. Often they've been fine........sometimes not so.
If it's on rollers then it may last, if it's on shells probably not.

Chris
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Old 16-01-2011, 11:14 PM   #3
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It's a rod journal off a big block chevy
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Old 16-01-2011, 11:33 PM   #4
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Could just the photo but the journal appears to be blued and that suggests a load of heat.

It looks to me like it needs a grind, sorry

To be sure, take it to your local engineers for a measure...most will do this for free. If you have a micrometer simply compare a good journal with the pitted one.

Standard size is 2.199" - 2.200" if that helps
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Old 16-01-2011, 11:35 PM   #5
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It's not blue - that's just my poor photo taking skills.
The journal itself measures bang on spec, even over the pitted area.
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Old 17-01-2011, 02:48 AM   #6
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Shells then!! The pitted area will remove white metal very quickly. Better get it reground and some non standard shells. Better to be safe.
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Old 17-01-2011, 04:10 AM   #7
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if its not really a high performance crank, u can by a stock size eagle crank new for the same amount of money that u would spend on grinding this one.

but either way, u need to replace or fix it and not use as is .
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Old 17-01-2011, 08:44 AM   #8
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"High performance boats" need "high performance journals" Matt.

Unless you like rebuilding motors?
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Old 17-01-2011, 09:18 AM   #9
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Quote:
Originally Posted by Matt View Post
it's not deep, but you can detect it with your fingernail


Thanks
Matt
its a lot cheaper to do it now than after after a couple of hrs on the water when its let you down,
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Old 17-01-2011, 09:42 AM   #10
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If I could feel it, I'd grind it, no question.

Lots to lose if you don't and turn out to be wrong. ...Are they currently std journal dia?
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Old 17-01-2011, 09:50 AM   #11
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I am veering towards JFDI, for all the reasons noted above.
But at the same time, I do want to sanity check, because a regrind on a journal uses up a "life", and on overall diameter even over the damaged area, journal ovality, etc, all meets spec.

Jon H - is there such a thing as a high performance big block motor?

Jon F - Yeh, all currently standard.

ETA - I think decision made - it's gonna get done.
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Old 17-01-2011, 11:48 AM   #12
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Without question a regrind Matt but have you found out why it picked up in the first place?

I'd get the shop to check over the whole rotating set when you regrind, check the line bore of the block and throw the oil pump out, they're too cheap not to just replace. Also replace the relief valves but make sure you get the right ones.

Then bear in mind how many places in the oil lines there are to trap some shite, remote filters, lines, coolers etc.
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Old 17-01-2011, 11:53 AM   #13
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I think , looking at the picture that it's corrosion not marks from it picking up.
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Old 17-01-2011, 11:59 AM   #14
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Same principle applies Wiggy, determine the cause to ensure you're not throwing good money after bad. Bitter experience
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Old 17-01-2011, 12:33 PM   #15
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I think the cause is understood - it's sat on a garage floor for 15 years and a bit of moisture got to it.
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Old 17-01-2011, 12:44 PM   #16
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Feck me is that how long you've been working on the Arrow.
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Old 17-01-2011, 02:08 PM   #17
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Matt, journals can be "polished" but only if the damage is very light. It really needs examining by an engineering shop to determine the best remedy.

Personally, considering the amount of work you are putting into the Arrow, do it once and do it right.

Now, get your hand in your pockets laddie boy!
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Old 17-01-2011, 02:20 PM   #18
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It's not a corner cutting financial consideration, I just don't want to sacrifice a life off the journal if I don't need to. Your 2nd line is spot on, it will be getting reground.
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Old 17-01-2011, 02:21 PM   #19
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P.S. The spec of the rest of the motor parts confirms my dick is firmly in the custard.
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Old 17-01-2011, 03:34 PM   #20
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pro·cras·ti·nate (prō-krăsˈtə-nātˌ, prə-)

verb procrastinated pro·cras·ti·nat·ed, procrastinating pro·cras·ti·nat·ing, pro·cras·ti·nates
verb, intransitive
To put off doing something, especially out of habitual carelessness or laziness.
verb, transitive
To postpone or delay needlessly.



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Does it look ****ed? Does it feel ****ed?...then it's ****ed....Duuuh!
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