Proper Torque procedures RX and Apex Motors

Ted Jannetty

Ted Jannetty

TY 4 Stroke God
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I have been recieving a lot of calls and emails regarding this so I will repost it with a few refinements.

Clean all taped holes thoroughly, apply Teflon Sealer if holes are open to coolant, or Oil if holes are blind.
Install studs hand tight.
Apply Moly lube to threads and washers both sides.
Torque using factory Proceedures and specs.
This includes the small outside bolts FACTORY SPECS.
Here is the part the makes the big difference.
Now go back in the proper sequence, One at a time, loosen the nut 1/4 turn and retorque to final spec in one motion, in this case 38 lb.ft. and 10 lb.ft.
You will see that the nut goes past where it was by up to 1/2 turn and you are not exceeding any torque values.
Never had a head gasket fail this way.

Happy Boosting.
 
Ted, what about if I'm going to use arp studs ?
 
I just re-bolted my head and have ARP studs.

I torqued to 14ftlb first pass from center through borders in criss cross pattern

Then torqued to 48ft-lb on 2nd pass

Then lossened everything and re-did the same 2 passes and finaly torqued the two small bolts (timing chain side) to 12nm


I must admit I was a little bit worried about torquing them that much, but they held, so now I assume my head is really clamped down quite a bit :)
 
Hey Chad. Take them up in two steps, in the proper sequence, to 45-48 lb.ft. Then just like Ted said ;)! . "Now go back in the proper sequence, One at a time, loosen the nut 1/4 turn and retorque to final spec in one motion, in this case 45-48 lb.ft. and 10 lb.ft."
Tom
 
mulot30th said:
I just re-bolted my head and have ARP studs.

I torqued to 14ftlb first pass from center through borders in criss cross pattern

Then torqued to 48ft-lb on 2nd pass

Then lossened everything and re-did the same 2 passes and finaly torqued the two small bolts (timing chain side) to 12nm


I must admit I was a little bit worried about torquing them that much, but they held, so now I assume my head is really clamped down quite a bit :)
Click to expand...

48 ft. lb. seems real high for a 10 mm stud I would be very afraid of pulling the threads out of the block.

I go 38 on stock studs and 42 on ARP Just My Opinion!
 
When we ran the 10mm studs with mid 30's boost and n2O, we ran 60 ft. lbs. torque in an attempt to keep a head gasket in. I red loctited the studs in, 1/2 turn off bottom, and torqued the head up to 20# and left it to set up over night, then retorqued the next day. The studs were repeatable after the big torque (ie not stretched). It did work out for us but I would not recommend torqueing them up that much. 42/48 ft. lbs. is lots for 99.9% of the applications out there. I was always holding my breath on the last trip around at final torque, for the reason Ted mentioned (pulling threads). If you need that much clamping force you need to upgrade to 12 mm studs. We finally have.
 
Thomas800 said:
When we ran the 10mm studs with mid 30's boost and n2O, we ran 60 ft. lbs. torque in an attempt to keep a head gasket in. I red loctited the studs in, 1/2 turn off bottom, and torqued the head up to 20# and left it to set up over night, then retorqued the next day. The studs were repeatable after the big torque (ie not stretched). It did work out for us but I would not recommend torqueing them up that much. 42/48 ft. lbs. is lots for 99.9% of the applications out there. I was always holding my breath on the last trip around at final torque, for the reason Ted mentioned (pulling threads). If you need that much clamping force you need to upgrade to 12 mm studs. We finally have.
Click to expand...

For what it's worth, 45lbs is a high as I will go on the factory studs using Moly. I've pulled studs out before at 50.
 
lakercr said:
For what it's worth, 45lbs is a high as I will go on the factory studs using Moly. I've pulled studs out before at 50.
Click to expand...

When you use moly your suppose to reduce your torque over oil.
At 38 with just oil some of my studs feel like they will never torque but they do.
 
Ted Jannetty said:
lakercr said:
For what it's worth, 45lbs is a high as I will go on the factory studs using Moly. I've pulled studs out before at 50.
Click to expand...

When you use moly your suppose to reduce your torque over oil.
At 38 with just oil some of my studs feel like they will never torque but they do.
Click to expand...

I factor 10% into the torque spec. Torque @ 45lbs with Moly = ~ 49lbs effective rate.
 
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