SBC Oil Pump Bolt Torque
 

7/16-14
Several online sources say 65# for a SBC oil pump bolt. A bolt torque chart says 70# dry and 55# oiled, for a grade 8 bolt, which it is. (6 radial lines)
The bolt started crushing the oil pump before the wrench clicked. It's the same pump I took off.
I yam con-fused.
It's a 94-ish 350 crate motor in a work van.

Re: SBC Oil Pump Bolt Torque
 

#50 oiled is my number. check yer wrench...

Re: SBC Oil Pump Bolt Torque
 

You should also have the part of an oil pump bolted to the rear main cap when you have it align honed. The better shops I have been to all do that. Same torque on the bolt when installing the pump. I always used 50lbs, lubed.

Re: SBC Oil Pump Bolt Torque
 

Ed is spot on.
The rear main will go out of round just like using or not using a TQ plate on the deck for the cylinders. I always align hone with 55 & oil on a bolt, a stud @ 50 with moly lube when I align hone and assy. I use my same assembly TQ wrench on it, too It is critical. Why even bother align honing if you are going to pull it out of round when you put it together??

Re: SBC Oil Pump Bolt Torque
 

I always use a stud for the pump. Should have included that.

Re: SBC Oil Pump Bolt Torque
 

I will check the wrench. It's a Snap On, I guess I could give it to the local Snap On guy for calibration. It's never given me any issues, and I had just torqued the rods previous to "torquing" the pump. But, anything can happen.
I'll try 50# oiled, when I get the new pump.
Thanks for the advice on the align honing. It's in a work van.

Re: SBC Oil Pump Bolt Torque
 

Last time I sent my Snapon torque wrench for 'recalibration" it was a lot more pricey than I thought it should be. I'd just find a couple of friends with wrenches and compare torque some bolts. ARP used to ck your wrench for free at national events.

Re: SBC Oil Pump Bolt Torque
 

I cant imagine crushing the pump housing...where did that pump come from?

Re: SBC Oil Pump Bolt Torque
 

It was on the engine when I got it. I could feel it giving as I pulled on the wrench. It didn't feel as if the bolt was breaking; it just kinda kept going. Hard to explain. The area that crushed is right under the bolt head. It's why I kind of figure the wrench is okay. It feels the same tightening other bolts as it aways has. -Certainly not a calibration test.
I haven't looked at it closely yet. I'm working under the truck and was more than ready to quit when I felt that!

I have the new one. I'll try posting pictures of each.

Re: SBC Oil Pump Bolt Torque
 

sneak up on the #50. let it sit for 15 minutes before heading to the final number. Im hearing horror storys on the redesigned & fragile sbc M55 pump housings from mellings....