 Plastigage tolerance, what am I looking for? |
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| VaccaRabite |
 May 14 2009, 12:40 PM
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#1
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En Garde!  Group: Admin Posts: 13,465 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region  |
I need to use plastigage on my crank to see what the clearance is.
What am I aiming for? How much is too much? Zach |
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Replies(1 - 6)
| SLITS |
May 14 2009, 12:59 PM
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#2
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
Haynes .... Page 11
Mains ... #1 & #3 ... 0.0016-0.007" #2 .......... 0.0011 - 0.0066" #4 ......... 0.0019 - 0.0074" Rods .... 0.0008 - 0.006" RADIAL Other than this, I know nothing! |
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| Jake Raby |
May 14 2009, 06:55 PM
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#3
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Those specs are worthless!! They give a full five thou of tolerance and a 914 engine with .006 main and rod bearing clearance will have ZERO oil pressure!!
Look for a max of .003 on the mains and .0025 on the rods, I like even less than this... And plastigage is NOT a precision measurement device.. The only way to do this is with a micrometer and a bore gauge... If you send the parts to me for balancing we'll do it for you. To check the main clearance the bearings have to be installed into the case and the case has to be torqued.... |
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| charliew |
May 14 2009, 09:52 PM
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#4
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Advanced Member Group: Members Posts: 2,363 Joined: 31-July 07 From: Crawford, TX. Member No.: 7,958 |
Or you can use the plastigauge and try to learn how the shade tree guys like me do it. I like to compare my mike readings to the plastigauge. The inside id of the mains are hard for me to do with a bore gauge. Plastigauge kinda rounds off the amounts but it really gets pretty close. To me it's actually easier to mike the clearances rather than torqueing it together with the plastigauge on all the mains and then taking it apart and not tearing the plastigauge up getting it back apart. The rods are easy.
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| DBCooper |
May 15 2009, 04:04 AM
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#5
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14's in the 13's with ATTITUDE Group: Members Posts: 3,079 Joined: 25-August 04 From: Dazed and Confused Member No.: 2,618 Region Association: Northern California |
+1
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| aircooledtechguy |
May 15 2009, 09:05 AM
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#6
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The Aircooledtech Guy Group: Members Posts: 1,966 Joined: 8-November 08 From: Anacortes, WA Member No.: 9,730 Region Association: Pacific Northwest |
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| aircooledtechguy |
May 15 2009, 09:06 AM
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#7
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The Aircooledtech Guy Group: Members Posts: 1,966 Joined: 8-November 08 From: Anacortes, WA Member No.: 9,730 Region Association: Pacific Northwest |
Oops, hit the button twice
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