What exactly is the precedure and tools required?

Would you do this with a smaller bore gauge to measure the mains and rods, and then use what... a micrometer or would you use a dial caliper to measure the crank journals?

Doing it with this method, what inconsistencies might you find? How consistent should you expect the clearances to be around the entire journal?

What tool is best used to measure the exact thickness and thickness consistency of a bearing?

Thanks,
Charles

 

ttt

 

ttt

 

A small dial bore indicator is the preferred too for this but there are also T gauges aka snap gauges. They are shaped like a T and the top expands. Then you use a micrometer to mearsure that. Also a micrometer for the journals measure 3 places 2 times each perpendicular so you can see runout, taper, out of round, etc. They should be round, I dont have the tolerances memerized but I know they're in the service manual.

For bearings thickness and consistency. There are ball end micrometers that should be the most accurate.

 

would a typical engine machine shop be able to measure these clearances for me if i dont have the proper tools?

 

I don't like snap gauges at all because you can't see a needle moving to tell you when you've got the bore gauge set up perfectly perpendicular to the bore.

 

the ideal way of measuring would be using an inside micrometer, buy they are pretty pricey. T's i find not to be accurate since they have to be locked in place to be able to measure them, sometimes throwing readings off.
Remember your measuring to .0001
another method is to use a bore gauge and zero it out to the blocks crank bores/rod big ends ID.
then you measure and lock your micrometer with the according crank journal.
put the bore gauge in the micrometer with the measurement you just did; that will give you total difference.
measure bearings with micrometer
the the rest is math

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mister2racer &raquo;</TD></TR><TR><TD CLASS="quote">What exactly is the precedure and tools required?

Would you do this with a smaller bore gauge to measure the mains and rods, and then use what... a micrometer or would you use a dial caliper to measure the crank journals?

Doing it with this method, what inconsistencies might you find? How consistent should you expect the clearances to be around the entire journal?

What tool is best used to measure the exact thickness and thickness consistency of a bearing?

Thanks,
Charles</TD></TR></TABLE>

Bearings will be thinner towards the ends than in the middle.

 

this is an old thread so my question was would a typical machine shop have the tools to do this so i dont have to?...

 

Yes, they will.

 

which brand of inside mic has the graduations of .0001?

 

My mitutoyo reads in incriments of .0005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nick91civicsi &raquo;</TD></TR><TR><TD CLASS="quote">this is an old thread so my question was would a typical machine shop have the tools to do this so i dont have to?...</TD></TR></TABLE>

They wouldn't be much of machine shop if they couldnt...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muckman &raquo;</TD></TR><TR><TD CLASS="quote">

They wouldn't be much of machine shop if they couldnt...</TD></TR></TABLE>

A long time ago we had to cut down a Nissan crank one time and had to use a machine shop that we normally didnt go to. So we take it there and we wanted it cut a certain amount. The place was a reputable place and was a huge company. They call us back 1 hr later and tell us they couldnt do it since they didnt have a tool that could measure as precise as we wanted. I was shocked... This place ended up having to borrow one of our Mitutoyo Digital calipers.
We had no choice but to let them use it. Fug... $400 calipers handed over to a place that should have had them.

they mostly did Domestic stuff so Im sure they didnt need to be as precise as we do on our stuff.

 

The proper tool to measure bore....


Be prepared to spend a few hundred on one though. It was one of my best investments ever along with my Mitutoyo digital micrometers.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tepid1 &raquo;</TD></TR><TR><TD CLASS="quote">
Be prepared to spend a few hundred on one though. It was one of my best investments ever along with my Mitutoyo digital micrometers.</TD></TR></TABLE>

yup we spent about $7000 total through the years on bore gauges, micrometers, calipers, etc.

 

Hell I don't have a business (just build motors for myself) and I have spent over 2k on metrology equipment such as micrometers, bore gauges, stretch gauges, scales, calipers, torque wrenches etc.