plasti-gage, verifying clearances on bearings



plasti-gage, verifying clearances on bearings

Postby grumpyvette » January 14th, 2009, 8:55 am

http://store.summitracing.com/partdetai ... toview=sku
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you can buy single strips but its far cheaper in larger size boxes, if your using it frequently
plasti-gauge is an excellent cross check tool, easy to use and accurate, if used correctly, and I would not be a bit concerned if thats all you had to check bearing clearances, I use a fairly expensive set of mics, and snap gauges but I always cross check with plasti-gauge, and you ll be surprised at how accurate its really is


read these links & threads

http://forum.grumpysperformance.com/viewtopic.php?f=53&t=4294

http://forum.grumpysperformance.com/viewtopic.php?f=53&t=247

viewtopic.php?f=53&t=3449&p=9134&hilit=+assembly+lube#p9134

viewtopic.php?f=53&t=2733


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viewtopic.php?f=53&t=852&p=1311&hilit=checking+bearings#p1311

https://www.youtube.com/watch?v=pmTyOza5-po

https://www.fordmuscle.com/fundamentals/plastiguage/

viewtopic.php?f=59&t=1026&p=4327&hilit=plasti+gauge#p4327

viewtopic.php?f=53&t=2726&p=7077&hilit=plastigauge#p7077

http://www.autozone.com/test-scan-and-s ... 36168_0_0/

http://www.hotrod.com/how-to/additional ... icrometer/

viewtopic.php?f=53&t=9214&p=43456&hilit=plastigauge#p43456
http://www.plastigaugeusa.com/how.html

Clevite 77 Plastigage
P/N Color Oil Clearance Range
MPG1 green .001 in - .003 in (.025 - .075 mm)
MPR1 red .002 in - .006 in (.050 - .15 mm)
MPB1 blue .004 in - .009 in (.10 - .23 mm)
MPY1 yellow .009 in - .020 in (.23 - .50 mm)


viewtopic.php?f=59&t=1390

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http://store.summitracing.com/partdetai ... toview=sku
Plastigauge, Green Kit, 0.001 in.-0.003 in. Clearance Range, Each

"Accurately measure bearing clearances.
Made from a special extruded plastic thread with accurately controlled crush properties, Plasti-gage provides a fast and accurate way to check bearing clearances. Plasti-gage is packaged in a calibrated envelope that not only protects the plastic threads, but also serves as a scale to measure the bearing clearance. One package contains enough Plastigage to check both main and connecting rod clearance for one engine. "

now this stuff is really easy to use , it looks like green angle hair spaghetti,, you spray down your crank journal,and matched bearing surfaces with wd-40 so it won,t stick to the surfaces, lay a 1/2" long section in the center of the journal, replace the bearing cap, and torque to specs, then WITHOUT spinning the crank you disassemble the bearing cap, remove the cap and use the edge of the package the plasti-gage came in to compare the crushed width to the scale on the edge of the packaging.
simple and REASONABLY EFFECTIVE, if you don,t own snap gauges and a full set of mics.......just remember to remove it from the bearing or journal,before you proceed further, in the engines reassembly


now personally I like the stuff (PLASTI-GAGE) as a secondary way to check bearing clearances, but a decent set of mics and a machinists caliper and snap gauges is a good thing to have , and altho I use plasti-gage I don,t trust it alone to check clearances

btw spray the bearing and the crank surfaces, and the plastigage with WD40 before you measure clearances and it won,t tend to stick as much
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http://www.harborfreight.com/cpi/ctaf/d ... umber=5649
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http://www.harborfreight.com/cpi/ctaf/d ... mber=32214

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http://www.harborfreight.com/cpi/ctaf/d ... umber=5043

http://www.use-enco.com/CGI/INPAGE?PMPA ... s/317-0764

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http://www.harborfreight.com/cpi/ctaf/d ... mber=97389

now theres FAR better QUALITY tools than the ones I linked too, but unless your doing engines on a regular basis I find these will work reasonably well, naturally if your doing it seriously youll want better quality tools

you might want too read thru this also

viewtopic.php?f=52&t=181

http://video.google.com/videosearch?oe= ... Q&start=20


from chevy high performance mag

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IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Re: plasti-gage, verifying clearances on bearings

Postby stroker87 » May 25th, 2009, 11:55 am

Grumpy, I understand how it works but not sure on the correct way to use it?

do you install a bearing then check or with out a bearing?

how do you know what clearance you need on the main & rod bearings?
stroker87

 
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Re: plasti-gage, verifying clearances on bearings

Postby grumpyvette » May 25th, 2009, 12:09 pm

it comes with instructions , in most cases,
but what you'll do in your case is,
pull ALL the main caps after stamping them, lightly with a die set

http://www.harborfreight.com/cpi/ctaf/d ... number=800

to insure they get replaced individually,In their correct location and facing the correct direction, you can lift the crank about 1/4" out of the block to ease replacement of the upper bearing shells, or IDEALLY you'll pull the whole rotating assembly for close inspection,
INSPECT THE BEARINGS CAREFULLY,
insert a 1/2" long strip of plasti-gauge across the bearing in line with the crank center line,
spray it with WD40,
replace the original main cap with its original bearing still in place,
torque that main cap back into place, and then WITH OUT moving the crank remove it and check the clearance against the chart
verify that with the factory specs, it should be close,
if its not a change in bearing size might be useful
if its within about a 1/2 thousandths, just replace with the same size NEW bearing, coated with MOLY assembly lube, torque into place understand that worn bearings will have a bit more clearance than new ones

viewtopic.php?f=53&t=88

viewtopic.php?f=53&t=852

viewtopic.php?f=53&t=247

Image
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

User avatar
Site Admin
Site Admin
 
Posts: 14105
Joined: September 14th, 2008, 1:40 pm
Location: florida


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