Plasti-gauge

TYTILIDIE

METH HEAD
Re: Plasti-gauge

I cant seem to get some of it off my main bearings and before I go any further, I want to make sure itll be ok.
 

TYTILIDIE

METH HEAD
Re: Plasti-gauge

This is the first time Ive ever used it. Ive done about 8 motors and never checked clearances and never had any problems til last spring when my old machine shop screwed me on my crank grind. So now I am a little paranoid about these things.
 

Don W.

Stab it and steer it
Re: Plasti-gauge

I'd vote for whatever comes off easily and leave the rest. Fingernail oughta do it though. Just FYI; I talked to a high end builder about plasti-gauge and he dosen't use it. He mics the shaft and the bearing prior to assembly. Dosen't trust plasti-guage. Just one builders opinion. Like you said check now and you can sleep tonight...
 

TYTILIDIE

METH HEAD
Re: Plasti-gauge

Dude, next time you build a motor take a bearing and notice that there is a very thin layer of a grayish white color paint. Get a set for a 350 so you have a few extras and you will see.

Yeah everything checked out to be great. I am still trying to find real time to put it all together. Maybe tonight.
 

myclone

Donating Member
Re: Plasti-gauge

Youre not rotating the motor with the plastigauge on the journals are you? If you are then dont ;) .

The "paint" is actually a thin layer of really soft metal and scratching a little bit of it off isnt a huge issue but the plastigauge should come off before it does. Try some acetone (finger nail polish remover) if youre having trouble getting the stuff off the bearings.
 

James Thomas

"NO CLASS"
Re: Plasti-gauge

Don W. said:
I'd vote for whatever comes off easily and leave the rest. Fingernail oughta do it though. Just FYI; I talked to a high end builder about plasti-gauge and he dosen't use it. He mics the shaft and the bearing prior to assembly. Dosen't trust plasti-guage. Just one builders opinion. Like you said check now and you can sleep tonight...


X500 with Don W. and his builder friend and that's not just one builders opinion! Clean the bearing shell with laquer thinner to get the wax off and buy a micrometer or take it to the machine shop and have them mic it for you. Do you really want to trust your high dollar engine build to a 0.20 cent piece of that stuff? I know a lot of people use it and most don't have any trouble (except for the poor guy that was told it was ok too just leave it cause it would "just melt out and go away") but it is not that accurate and can not be used in some places, you are mic'ing the crank in two place 180 deg. apart right (try that on the bearing cap parting line!)? Also install your rod and main shells and torque them to 5 lbs. less than torque spec. and mic the "inside dia." of them.


Plasti - Gauge was made for military & oil field service tech's to be able to check "rough" clearances in the field with out having to carry expensive precision tools all over that were subjected to a lot of knock around abuse. Or so my gandfather told me anyway. In any case, I think we can do a lot better :tup: !
_________________
James Thomas
 
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It's just a six

Super Member
Re: Plasti-gauge

You can clean it off the bearing with a scotchbrite pad (soft type) & fill a bucket of warm water with soap & scrub it off with the scotchbrite pad. Then rinse w/clean warm water.
Plastigage is fine to use if you are not comfortable with snap gauges ,mics etc..
Good luck
 

TYTILIDIE

METH HEAD
Re: Plasti-gauge

I actually got most of it off. Its just kind of a film that was stuck on there. Tomorrow I plan on taking the caps back off before I install my pistons and will see if it will wipep off the rest of the way. Im not really all that worried about it at this point. It is just a film but I will try and get it all off. If not, I happen to have an extra set of bearings around I can use.
 

It's just a six

Super Member
Re: Plasti-gauge

It will look like something is still there even if you clean it off good.. thats why I use a scotchbrite pad & warm water, then it will be completetly gone. :tup:
 
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