How to Check Bearing Clearances Plastigage – Engine Rebuild Do It Yourself (Part One)

DIY engine rebuild. See Part Two:
How to check main and rod bearing clearances.
This is to prevent low oil pressure or seized bearings.
clearance required = .001″ – .003″ for almost all engines

I ordered the Plastigage wire here. $2.50 (Search Plastigage)



34 thoughts on “How to Check Bearing Clearances Plastigage – Engine Rebuild Do It Yourself (Part One)

  1. It's his wife, and she's asking questions like that for the general people who would comment those questions and wait for an answer, so instead of the general people doing that, she does it for them, so quit being a bitch ass kid and shut the fuck up.

  2. It's a beam style. What he's doing isn't going to hurt it. Long term it'll stay accurate long after clicker styles have totally broken.

  3. The rod cap is already off. Push the piston out a few inches and measure with a caliper. Not that hard… Or were you just being sarcastic?

  4. there is something about you that tells me you suck at building a engine
    you have to tightening the cap first spine the crank 1s or 2s then you take it of and put the plastic gage check it wipe it of put it back on and keep going like that for every cap and rod caps and your problem now is that you did not polish the crank and measure it so you know what barrings you need i can see the crank is not polished its best to be at 1.5 of an inch your engine will start knoking soon

  5. I hope all these people talking about and liking the ratchet comment are joking. If you seriously fear that your torque wrench will become uncalibrated from this, then you bought one crappy torque wrench and could possibly be obsessive compulsive.

  6. 1.Is plastigauge used before sending to the machine shop or after getting from there.
    2. Should the bearing clearance be measured at all journals.
    3. If so should we put plastiguage simultaneously at all journals or one journal at a time.
    4. When we check only one journal should all the other bearing caps torqued to the specifications.

  7. Thanks for sharing. A couple of comments for improvement, you might mention it's very important for everything to be spotlessly clean for testing clearances and especially for final assembly. A bit of dirt anywhere can screw up your measurement. It was hard to tell from your video if you got any real squash of the plastiguage. Since your readings were at the extreme end of the plastigage range it might be better to verfiy your clearances with the next size plastiguage.

  8.  the reason its not the same clearances aross the whole surface is cause you didn't take your crank to get POLISHED. or Re grinded. 

  9. SBC 350 main bearings clearance spec is .002-.003… rod bearing is .002-.0025 so he is on the looser side of spec but the margins are slim… plus that is a wore out motor, i wouldnt call this a rebuild, looks like an overhaul, which is basically, in my opinion, a waste of time. Do it all or dont do anything.

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