1991 na shortnose vs long nose
Discussion
I am considering a 1991 mx5 na
I have heard that early cars had a short nose ?engine bolt? (please forgive my ignorance) which could lead to significant engine problems
-would a 1991 car have this short nose engine bolt , or the more reliable long nose bolt?
can you tell by the chassis number?
-is it possible to convert the older , less reliable type to the newer more reliable type?
if so, what would need to be done , and how much do you think this would cost?
- how common is it for the short bolt type of engine to actually manifest a problem?
-what problem does the shearing of this bolt cause ?
thank-you
I have heard that early cars had a short nose ?engine bolt? (please forgive my ignorance) which could lead to significant engine problems
-would a 1991 car have this short nose engine bolt , or the more reliable long nose bolt?
can you tell by the chassis number?
-is it possible to convert the older , less reliable type to the newer more reliable type?
if so, what would need to be done , and how much do you think this would cost?
- how common is it for the short bolt type of engine to actually manifest a problem?
-what problem does the shearing of this bolt cause ?
thank-you
Lots of info on here if you do a bit of digging.
http://forum.miata.net/vb/showthread.php?t=357133
HTH.
Cheers, Pewe.
http://forum.miata.net/vb/showthread.php?t=357133
HTH.
Cheers, Pewe.
Nothing wrong with a short-nose crank (it's the end of the crankshaft that is different, nothing to do with the bolt). A few have failed but that's usually down to mistakes in servicing rather than a fault with the design.
For your info, if the crank pulley is correctly refitted and torqued up then it can rattle around a bit which chews up the woodruff key & keyway and that can be terminal for the engine depending on how bad it is.
Personally it wouldn't put me off. Engines are cheap. Condition of the body, particularly around the sills & rear arches is much more important.
For your info, if the crank pulley is correctly refitted and torqued up then it can rattle around a bit which chews up the woodruff key & keyway and that can be terminal for the engine depending on how bad it is.
Personally it wouldn't put me off. Engines are cheap. Condition of the body, particularly around the sills & rear arches is much more important.
snotrag said:
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