Loctite main bolts

[ak-dsm]

Not sure, but is it ok to loctitie the main cap bolts on the crankshaft when installing.

 

[DSM_PWR]

No..

I always use ARP Moly Lube, even on stock bolts.. you can get away with using oil

 

[blackrosenova40]

Read #7

ARP | Frequently Asked Questions

 

[Ibbanez]

Never loctite those bolts. Loctite is fine on some things but definately not that. IMHO

 

[ak-dsm]

Alright thanks guys

 

[gearhead37683]

yeah just like everyone else said never use loc tite on rod or main bolts,

 

[My1GLaser]

I assume you are using stock mains since you didn't specify changing to ARP. You should use SAE 30 wt oil on the threads. Using ARP moly lube will reduce the friction to the point that you could over torque them accidentally. ARP | Tech - Installation Click on "using a torque wrench."

For instance: Head studs are 80ft/lb with ARP moly lube & 120ft/lb with SAE 30 (IIRC).

So, I assume you would need way less torque with moly lube to achieve the same clamping force on the main caps. You could pull the journal out of round using stock torque specs with the moly lube. Some would say that is overkill. Built motors cost a lot of money so I don't f_ck around when it comes to specs no matter how insignificant it might seem.

 

[mindset]

Can someone explain why we cant use loctite on those?

 

[DSM_PWR]

....For instance: Head studs are 80ft/lb with ARP moly lube & 120ft/lb with SAE 30 (IIRC).....

i havent read an arp install guide ina while, but i cant see them handling 120ft lbs..

Hell i wouldnt even torque my L19s that much

 

[donniekak]

i havent read an arp install guide ina while, but i cant see them handling 120ft lbs..

Hell i wouldnt even torque my L19s that much

Arp specs are 86 ft/lbs with moly lube, and 109 with 30w oil. This is for their regular 6-bolt m12 headstuds.

 

[DSM_PWR]

Arp specs are 86 ft/lbs with moly lube, and 109 with 30w oil. This is for their regular 6-bolt m12 headstuds.

I thought so...

 

[My1GLaser]

I was going off memory, but I found this sheet that came with my head studs. I was just using the example so the OP would realize the implication of changing the lubricant when using a specified OEM torque rating. Especially on something as critical as a journal with .002 oil clearance.

 

[DSM_PWR]

wow thats insane WTF

I still would never torque them that high (95ft lbs max IMO)

 

[velocitysport31]

you can use loctite if you want it to be permanent as per the instructions.

 

[tektic]

You guys are missing the point. If you use different lube on the thread the actual stretch and clamping force is the same if you follow the directions for the lubricant you are using. Following the directions to the letter is the best way to ensure success. Lock tight is a no no. You will not get the correct and even clamping force. You will have a hard time disassembling and cleaning threads . its also not necessary.