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| Bolt tension https://www.ausmini.com/forums/viewtopic.php?f=2&t=64474 |
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| Author: | guna mk1 [ Sat Jul 17, 2010 11:20 pm ] |
| Post subject: | Bolt tension |
Hi I would just like to double check some bolt tension figures with the experts Engine is a 1275 (1100s) Main bearings i have done to60ft lbs without locktabs and bigends to 35 ft lbs. I hope this is correct, the manual listed 45 ft lbs for cooper s only. Do they use better blts for the higher tension? Thanks |
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| Author: | DOZ [ Sun Jul 18, 2010 12:07 am ] |
| Post subject: | |
What are the rods - some 1100s have S rods. I would be very careful with what you are doing in there, its not something with a margin for error. Dan |
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| Author: | drmini in aust [ Sun Jul 18, 2010 9:08 am ] |
| Post subject: | |
Measure the threads on the bolts. If they are 3/8" (same rods as Cooper S) they should be 46 ft/lb. The later 1100S, & 1275LS onwards bolts are 11/32" diameter, I think they are 35lb/ft (my 6 manuals don't say different). |
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| Author: | GT mowog [ Sun Jul 18, 2010 9:23 am ] |
| Post subject: | |
drmini in aust wrote: I think they are 35lb/ft (my 6 manuals don't say different).
35 ft/lbs is correct. |
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| Author: | guna mk1 [ Sun Jul 18, 2010 9:53 am ] |
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Hi Just had a look at the rods they are AEG521 . I'm guessing that might be cooper s and 46 ft lbs Thanks |
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| Author: | drmini in aust [ Sun Jul 18, 2010 10:02 am ] |
| Post subject: | |
Yes that is correct, if bolts and nuts are originals. Have a good look at the threads on the bolts, if damaged replace them. Note that ARP's replacement S ones are 50ft/lb, using the moly lube supplied with them. These are getting bloody dear now, I use ARP's 155-6002 `big block' Ford ones instead. Just take a slight head reshape on the sander to fit. Less than 1/2 the price..... same grade bolt. 
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