Lock washers

[1969 beep beep]

I am installing my scatter shield and transmission. The scatter shield came with grade 8 lock washers, flat washers and bolts to bolt the bellhousing to the block. Should I use the lock washers? I know the factory only used flat washers. I have read that lock washers could come loose with time. Should I also use lock washers on the transmission or a star washer? Any recommendations. Thank you

 

[hangn0ut]

I don't care for split ring lock washers. They tear the surface up that they ride on. I also heard they come loose over time. Maybe,maybe not. That being said a set of headers I picked up has lock washers with the header bolts. And I will use them because the header bolts are as long as the bolt holes are deep. And I feel that some bolts may bottom out before they tighten up properly. Also has flat washers. So it goes,bolt, lock washer,flat washer,header flange. Lock washer locks against the flat washer. Flat washer locks against nothing. What's the point? But I do intend to use them.

 

[coloradodave]

I am installing my scatter shield and transmission. The scatter shield came with grade 8 lock washers, flat washers and bolts to bolt the bellhousing to the block. Should I use the lock washers? I know the factory only used flat washers. I have read that lock washers could come loose with time. Should I also use lock washers on the transmission or a star washer? Any recommendations. Thank you

Since you asked, I would forego the flat washers and just use the lock washers and bolts to attach the scatter-shield to the block. In my 50+ years of working on cars I've never had a bolt back out that was secured by split ring lock washers and torqued correctly. Same goes for the transmission to scatter-shield bolts.

 

[rrTor-Red]

ARP bolts and be done

 

[smallie9]

The flat washer should be placed first, then the lockwasher on top, and torque the bolt. Any damage done will be on the flat washer. I work on military vehicles, and that is the way they are on every vehicle on almost every fastener, and many are subjected to stresses and vibration far exceeding our little old cars.

 

[1969 beep beep]

Thanks guys for all the feedback.