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08-06-2012, 08:45 PM
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#1 |
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Registered User
Join Date: Nov 2010
Location: Fresno California
Posts: 65
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can you replace one main bearing cap without line boring
i got a broken main bearing cap, can i put a new one on without having it machined.
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 1986 GMC Sierra Classic 4X4
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08-06-2012, 09:04 PM
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#2 |
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Registered User
Join Date: May 2008
Location: Waukesha, WI
Posts: 904
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Re: can you replace one main bearing cap without line boring
You should have it checked/bored. How did it break?
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70 stepside 76 blazer 86 Silverado 20 Max Trailering 6.2 Crew 71 Nova SS My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=363634 |
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08-06-2012, 09:13 PM
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#3 |
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Registered User
Join Date: Nov 2010
Location: Fresno California
Posts: 65
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Re: can you replace one main bearing cap without line boring
while i was torquing in down it snapped on the side for some reason
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1986 GMC Sierra Classic 4X4
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08-06-2012, 09:16 PM
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#4 |
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Registered User
Join Date: Jun 2004
Location: Medford,Oregon
Posts: 390
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Re: can you replace one main bearing cap without line boring
I agree with russgt.
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08-06-2012, 09:54 PM
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#5 |
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Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: can you replace one main bearing cap without line boring
You sure can. Just replace it with the original
 otherwise no have it line honed periodPosted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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08-07-2012, 07:45 AM
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#6 |
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Registered User
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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Re: can you replace one main bearing cap without line boring
Take it to your machine shop, most have buckets of caps that have been salvaged off of old blocks. Mine took the time to check several, ended up with one that was a dead-on fit. Saved me some money for sure!
And if you're watching Horsepower TV to learn how to build one, DON'T!!! I cringe every time I see those guys smacking main caps down into the registers with a hammer. You're applying what amounts to reverse direction detonation when you do that. Snug 'em down, then tighten the bolts to get the cap to snap down into the registers. |
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08-07-2012, 07:47 PM
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#7 |
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Registered User
Join Date: May 2008
Location: Waukesha, WI
Posts: 904
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Re: can you replace one main bearing cap without line boring
Lightly taping the cap with a hammer will ensure that the cap has properly seated, preventing what happened here, tightening down a cap and it breaking because it was not sitting flat on the block.
__________________
70 stepside 76 blazer 86 Silverado 20 Max Trailering 6.2 Crew 71 Nova SS My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=363634 |
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08-07-2012, 08:05 PM
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#8 |
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Registered User
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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Re: can you replace one main bearing cap without line boring
If it broke when he torqued it down into the register, it was cracked. Tapping it on the side where the bolts go, the TV gurus tap 'em directly in the center of the cap.
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