I have never had one of the 912's fail since I started using them except 2 that I put in backwards. (opposite thrust)
They pushed the end of the shell out, just like the original Jesel's do.
I got mixed up on which way the originals were pushing out.
I also pack the bearings with a transmission assy grease when I assemble them.
I don't start the engine dry, either.
I also pull the rockers off when the car sits between races. (saves springs, too)
I will watch for what you said happened to yours, Thanks.
The current cam profile has a .986 net intake lift and .872 net ex lift.
I used to have about 2 times the failure rate on just the intake side even though the ex rocker has more offset.
Replacing rocker arm needle bearings with bushings?
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Re: Replacing rocker arm needle bearings with bushings?
Adger Smith
Adger Smith Performance Engines
903 794 7223 shop
903 824 4924 cell
adgersperf@aol.com e-mail
Adger Smith Performance Engines
903 794 7223 shop
903 824 4924 cell
adgersperf@aol.com e-mail
Re: Replacing rocker arm needle bearings with bushings?
The way it appears in the pic posted of the bearing, it doesn’t look like the needles are contained within the end cap.
Somewhat handy with a die grinder.
Re: Replacing rocker arm needle bearings with bushings?
The needles aren't captured. Notice in the bearing picture there is a thicker side on the bearing to help resist thrust though. Maybe my stuff is so old that was instituted after my purchase.
1965 dodge Dart, 549 cu in wedge, 8.60 at 156 mph best. 2905 lbs, soon, 8.40s!
Re: Replacing rocker arm needle bearings with bushings?
The Jesel's needles are not capatured, but the Timken b912's are. Needle bearings are not designed for side thrusts. I believe the one thick side has more to do with manufacturing than anything else. Just my opinion.
Re: Replacing rocker arm needle bearings with bushings?
I always thought the heavy side was there to press against during installation.
Re: Replacing rocker arm needle bearings with bushings?
Could be. I have seen them with and without thick side. All I know is that I keep cracking them and it has nothing to do with side thrust ,in my application. Talked to Larry at T & D along time ago and he said that the needles scoot/seperate under load and shaft hits the shell,thus cracking it. He said that is why they use a cage for the needles....keeps them parallel and in location.