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-   -   Is this crank / motor salvagable? (https://www.miataturbo.net/general-miata-chat-9/crank-motor-salvagable-11873/)

y8s 08-15-2007 11:10 AM

Is this crank / motor salvagable?
 
big photo to load test philips bitch:

http://www.y8spec.com/motor/crank.jpg

Splitime 08-15-2007 11:28 AM

It's hosed. (crank at least)

If the mains look fine... just get another crank. But that looks like some oil starvation or something similar, since it is on all the rod ends... so rest is probably hurt.

Ben 08-15-2007 11:35 AM

that's what I was thinking. this looks like you might not get anything other than a shortblock out of it. a shortblock that needs machining.

neogenesis2004 08-15-2007 11:39 AM

is that your bottom end? If you look up the bores in the pics, the rods look pretty smashed to me.

Arkmage 08-15-2007 11:41 AM

that's pretty nasty. I don't know how much they can machine the crank down and still stay in spec... but if that's salvageable it's going to be a ---- hair away from out of spec.

y8s 08-15-2007 11:49 AM

is that my bottom end, heh no.

it's the motor bruce has.

neogenesis2004 08-15-2007 11:57 AM

if you were mcguyver you would take a car battery and some wire and weld the rods back together, then throw some chewing gum on the crank, and it would be good to go.

<---owns every season on dvd :)

olderguy 08-16-2007 09:29 AM

On the advice of the above members, I disassembled the rest of the short block. The only damage that is not directly replaceable(piston, connecting rod, oiler) is at the one bearing that spun and locked, doing the damage to the crank and connecting rod.

The rest of the journals and bearings are pristine, so if no one buys it, I will rebuild the bottom end.

Does anyone have a link to connecting rod bearing sizes so I can see if there is enough meat left on the one position to turn the crank? Haven't rebuilt a motor since I was a kid and did my mothers straight 8 Buick.:eek:

Arkmage 08-16-2007 05:12 PM


Originally Posted by Flyinmiata's page
"stock, +0.25mm/0.10" and +0.50mm/0.20"

on main, rod, and thrust bearings. just noticed their inch denominators are off by a decimal place.

nester 08-16-2007 05:31 PM


Originally Posted by y8s (Post 140365)
is that my bottom end, heh no.

it's the motor bruce has.

I have a bottom end for you. :)

y8s 08-16-2007 07:41 PM

what about a cyl head and what about cheap? :D


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