Cross bolted main cap questions
#1571414
01/31/14 12:48 AM
01/31/14 12:48 AM
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Joined: Aug 2009
Posts: 2,042
Mooresburg, Tn
'72CudaRacer
OP
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OP
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Mooresburg, Tn
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I am freshing up a friends 540 ci RB engine that has a after market Mopar block with cross bolted main caps, like a Hemi does. I've never done one of these and I need to know the proper procedure for torqueing the main caps. I'm guessing that I need to install all bolts to a light torque, then torque the main studs completely, then torque the side bolts last? If this is correct, what should the torque values be? I'm assuming the side bolts need some sort of sealer on the the washer to block surface to prevent oil leaks. What works best there?
Thanks,
Brian
Last edited by '72CudaRacer; 01/31/14 12:49 AM.
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Re: Cross bolted main cap questions
[Re: '72CudaRacer]
#1571415
01/31/14 12:57 AM
01/31/14 12:57 AM
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Joined: Jun 2009
Posts: 171
Indy
moparman89
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Indy
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25 ft/lb on the cross bolts, never used a sealer. The cross bolt really have no effect on the roundness/diameter of the housing bore.
School of Automotive Machinists Racing
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Re: Cross bolted main cap questions
[Re: Cab_Burge]
#1571417
01/31/14 02:00 AM
01/31/14 02:00 AM
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Joined: Feb 2004
Posts: 2,073
Tulsa, Ok
WadeMetzinger
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Tulsa, Ok
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On my Mega block I used 100 on the mains and 40 on the side bolts with oil. But the key is whatever the machine shop that alight honed the mains but you may not know that, I have them or I stamp the torque specs on the pan rail)Torquing the mains first. I use a little silicon on the side bolt washers just to be safe from leaks.
Wade Metzinger 918-809-0987 71 Cuda 9.28@145 -1s, Pglide 68 Cuda 10.64@124 1.45 60's 318->390 eddys Moparts discount code on WIX - moparts www.Filter1.com
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Re: Cross bolted main cap questions
[Re: WadeMetzinger]
#1571418
01/31/14 09:14 AM
01/31/14 09:14 AM
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Joined: Mar 2006
Posts: 9,841
MI, usa
dvw
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MI, usa
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Quote:
On my Mega block I used 100 on the mains and 40 on the side bolts with oil. But the key is whatever the machine shop that alight honed the mains but you may not know that, I have them or I stamp the torque specs on the pan rail)Torquing the mains first. I use a little silicon on the side bolt washers just to be safe from leaks.
I used these specs also. And since I was there when we were line honing it. I decided to remove the side bolts and remeasure when we done. It did make a small difference whether the side bolts were installed. Mine is an older Mopar Mega Block.
Doug
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Re: Cross bolted main cap questions
[Re: dvw]
#1571419
02/01/14 01:34 AM
02/01/14 01:34 AM
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Joined: Aug 2009
Posts: 2,042
Mooresburg, Tn
'72CudaRacer
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OP
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Mooresburg, Tn
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Quote:
Quote:
On my Mega block I used 100 on the mains and 40 on the side bolts with oil. But the key is whatever the machine shop that alight honed the mains but you may not know that, I have them or I stamp the torque specs on the pan rail)Torquing the mains first. I use a little silicon on the side bolt washers just to be safe from leaks.
I used these specs also. And since I was there when we were line honing it. I decided to remove the side bolts and remeasure when we done. It did make a small difference whether the side bolts were installed. Mine is an older Mopar Mega Block.
Doug
Thanks for the info guys. I believe this is also a old mega block. It is massive in some areas (lifter bore area for one). If I treat this like a Hemi, my old book says 100 ft-lb on cap bolts and 45 ft-lb on tie bolts, however, it doesn't tell me the procedure to use. I think I'll be fine. 
Thanks,
Brian
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Re: Cross bolted main cap questions
[Re: rickseeman]
#1571423
02/04/14 09:37 PM
02/04/14 09:37 PM
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Joined: Mar 2006
Posts: 9,841
MI, usa
dvw
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master
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Quote:
Torque all the main cap bolts first, then the side bolts.
I agree. Brian mine is an old Mega block also.
Doug
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Best bet would be to call the Mopar Tech line and see, if there still open and answering the phone lines 
if they have the recommended specs and procedures 
I've done a couple of the World Wedge and one hemi block and 45 ft lbs comnes into my mind for the side bolts torque specs, but there not the Mopar brand either 
