29 replies to this topic

[jaydee]

Heres how a cow girl does an oil change

 

 

 

C'm on Iain next one will be checking the thrusts! ;)

Edited by jaydee, 18 March 2014 - 12:34 AM.

[IainNeon91]

Thanks for the vote of confidence Tiger99!

 

And jaydee, that is definitely next on the to do list!

 

Just to ask, why a micrometre and not a vernier (manual)?? 

 

Because i just used a vernier calliper to measure the main bearing journal and, if i worked it out correctly, it read 44.50mm...??

 

They haynes says 44.46-.47 

 

Is a micometre more accutre/precise?? 

Edited by IainNeon91, 18 March 2014 - 12:58 AM.

[tiger99]

I love that video clip of the cowgirl! Just as well we are not politically correct on this forum!

 

As for the micrometer, it is maybe 10 times more accurate than the vernier, however a vernier is sufficient to tell you whether a crank is undersize or not, as that is done in steps of 10 thou usually. A micrometer will go one better, by telling you how much wear there is, in fractions of a thou, and whether the journal is oval or tapered, by measuring in several places. Both tools have their uses, a micrometer usually spans only 0-1", 1"" to 2", etc, while a vernier has a span of maybe 6 inches or more.

[jaydee]

What is politically correct?

 

I love blonde girls, especially those with green eyes.. but that vid was too funny lol

[IainNeon91]

Well i measured the journals with a vernier and this is how they cam out, starting the flywheel end:

 

Flywheel main:

 

1st big end:

 

2nd Big end:

 

Centre main end:

 

3rd Big end:

 

4th Big end:

 

Pulley main end:

 

I will check them again with a micrometer, but they seem to be pretty close within the limits to me

 

Cheers,

Iain.

Edited by IainNeon91, 18 March 2014 - 12:28 PM.

[Cooperman]

Is that the original crank or the 'new' A+ one?

[IainNeon91]

Is that the original crank or the 'new' A+ one?

This is the re balanced and polished A+ one. Its the original crank that the pistons and rods I bought came off

Edited by IainNeon91, 18 March 2014 - 01:51 PM.

[Cooperman]

Now measure the original and show us what it measures.

[IainNeon91]

Just out of principle?? 

 

Surely the measurements of the new crank determine what new shells I need??

[Cooperman]

Yes, of course, but your original post stated that your engine 'locked up' when you did a trial build using the original bearing shells. if the original crank was undersize, then the thickness of the old bearing shells would be too great, thus causing the crank to lock up.

So check this either by looking at the face of the old bearings to see if they are stamped as undersize, or measure the old crank and compare it to the new one.

[IainNeon91]

Got some pictures of the original crank

 

Flywheel main:

 

Centre main:

 

Crank pulley main:

 

I will go check to see if there's anything stamped on the old bearing shells

[IainNeon91]

You sure know some stuff Copperman!

 

No doubt, all of the shells said '.010 U/S'

 

Edited by IainNeon91, 18 March 2014 - 05:43 PM.

[Cooperman]

There you have it, Iain. So you have no engine problem, just a need for the correct shells.

Enjoy building your engine.

[Captain Mainwaring]

I love that video clip of the cowgirl! Just as well we are not politically correct on this forum!

 

As for the micrometer, it is maybe 10 times more accurate than the vernier, however a vernier is sufficient to tell you whether a crank is undersize or not, as that is done in steps of 10 thou usually. A micrometer will go one better, by telling you how much wear there is, in fractions of a thou, and whether the journal is oval or tapered, by measuring in several places. Both tools have their uses, a micrometer usually spans only 0-1", 1"" to 2", etc, while a vernier has a span of maybe 6 inches or more.

 

 

With respect, neither are accurate if you don't know how to use them. Lot to be said for finding and old set of slip gauges and practicing to use both Micrometer and Vernier calipers.

[ricediana64]

Thanks a lot! That was a fast response!