"TranSurgeon" wrote
good rule of thumb is you should be able to hook your little finger over one
> of the counterweights and turn it easily, a really good one will go for a
> half-turn or more with a flick of the pinky
Agreed. When I'm replacing pistons in 3100 engines, I can turn the crank by hand with the pistons and new rings in place, con rods torqued up, no heads on the engine, engine bolted to the torque convertor and trans.
Ian
somehow, I juest KNEW you'd appreciate that high-tech definition............
If they did that:
They're asking for a crack to happen. Read the manual, for every crank, there is a specified fillet radius!
Refinish King
performance
Agreed,
Sounds like he either:
1: Got a bent crank.2: Got a crank cut 00.9
3: Even better, the machine operator was on crack and left the machine on a 1/2' stroke when doing the mains?LOL
Refinish King
Ian, What's up? I see you found my new hiding place. How's things in the Great White North?
-- Old Crow '82 Shovelhead FLT 92" 'Pearl' '95 Jeep YJ Rio Grande ASE Certified Master Auto Tech + L1 TOMKAT, BS#133, SENS, MAMBM, DOF#51
We get cranks ground .010 under in order to get a bigger fillet radius all the time, for formula ford cranks. Very common. I have no idea what the new radius, I just ask John at Canada Chrome to do it and he does it. he's been grinding cranks probably longer than I've been alive.
Brian
bull crap
youo can torque 'em as many times as you want, and it still won't make it too loose..........
yeah, those chain tensioners on small-block Chevies sure work good.............
Ditto! It's from 'not' using plastigauge to double check things.
And the one that the Jeep engine in question 'doesn't' have works really good too.
I wish this fool would go away with all his BS. He 'might' know something, but it certainly isn't Jeep engines and he keeps telling people to do things that will cost them big bucks or are just plain wrong.
A timing chain tensioner on a Jeep 4.0. LOL!
Mike
A radiused fillet is less likely to crack than a sharply ground one, re the stress raiser phenomenon we have discussed before.. I think that more often than not, the fillet is not intented to be left overly large...it is probably a result of less than precise machining.
It can interfere with the edge of the bearing, just as "c" said.
I never heard of anyone using narrower bearings, but they do 'relieve' the edge of the bearing where it might contact the fillet.
Seems I have seen a special tool to do this, but don't have one myself.
It's called a bearing knife or bearing scraper:
But, if you have an excessively large fillet radius, especially in a cast iron crankshaft. that is the perfect place for a radial crack to begin.
The fillet radius should be ground with the stone dressed to the propper radius for the crankshaft in the machine.
Refinish King
I guess Lunati and all of the other aftermarket crank manufacturers have been doing it wrong all these years.
Chris
"The King" has never let facts get in his way. He just babbles on whether he knows what he's talking about or not. Bob
That's on new:
not a regrind.
So like I said, go look in the book that crankshaft grinders use. You'll be surprised, and more surprised at what they use for gauges to check the stones when they dress them.
Refinish King
Do you want me to use the book that I used for the 4 years that I worked in a racing engine shop, or do you have a specific one in mind?
Chris
in
APRA Crankshaft specifications and tolerances!
Racing engine shops use different tollerances, I've been there!
Refinish King
mr roman heres the parts number the tensoner you say doesn't EXIST!!! for the 4.0
33003440Mike Roma> TranSurge> >
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