Loose rockers
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Junior User
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From: Texas
Loose rockers
Well, New cam and lifters installed, set all by crane's procedure, Broke cam in at 1500 RPM for 30 min as suggested, now there are several rockres that have come way loose and are no longer working. I have bolt down rockers, any suggestions or ideas, I will re adjust everything again. I did notice that when setting the valves taking it one turn seemed a bit loose. Now that the lifters are full of oil is the same procedure good? Thanks for any input
Joe
Joe
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From: torrance
I take it these are hydraulics? What is a "bolt down lifter"? I don't believe I have ever heard that term before.
Anyway, follow the Ford manual for adusting lifters. With engine running, loosen until it starts to clack, then tighten down until it stops and then turn the specified amount after that.
If you have real loose ones right now, follow Cranes instructions and then re-tighten. Sounds as if you didn't have some valves set at proper place before tightening the first time around. Valves must be in fully closed position before setting initial adjustment.
Chuck
Anyway, follow the Ford manual for adusting lifters. With engine running, loosen until it starts to clack, then tighten down until it stops and then turn the specified amount after that.
If you have real loose ones right now, follow Cranes instructions and then re-tighten. Sounds as if you didn't have some valves set at proper place before tightening the first time around. Valves must be in fully closed position before setting initial adjustment.
Chuck
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Slammercb, Well the obvious is true, its "bolt down ROCKERS" sorry, in my haste I overlooked the error.
I set all the valves intially on the base circle of the cam, waited for the opposite valve to just start opening then you can be sure the one vale is fully closed lifter resting on the base circle. There is some some conflicting data in the valve setting process. Ford and every thing else says, 0 lash plus 1/2 to 1 turn on the bolt, however, it is a threaded fastener and there should be a torque value (18-23 ftlbs). So, I was curious to see if there were any other people with the same problem. Sooo, now that the lifters are pumped with oil, I will try avenue B and bring each valve so the lifter (Hydraulic) is on the base circle of the cam then torque each bolt to 23 ftlbs. When done I will post to give results. Thanks for the tips.
Joe
I set all the valves intially on the base circle of the cam, waited for the opposite valve to just start opening then you can be sure the one vale is fully closed lifter resting on the base circle. There is some some conflicting data in the valve setting process. Ford and every thing else says, 0 lash plus 1/2 to 1 turn on the bolt, however, it is a threaded fastener and there should be a torque value (18-23 ftlbs). So, I was curious to see if there were any other people with the same problem. Sooo, now that the lifters are pumped with oil, I will try avenue B and bring each valve so the lifter (Hydraulic) is on the base circle of the cam then torque each bolt to 23 ftlbs. When done I will post to give results. Thanks for the tips.
Joe
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Well, sure enough, looking through all the procedures and write ups on how to set the valves on Hydraulic lifters, talking three times with Crane cams Tech hotline, it wound up running perfect with torqueing the Bolt on Rockers to 23 FTLBS. Started up and runs like a champ. New Cam gives it lots of Mid range PEP, This 86 Ford F-150 6 300 now breaths a little easier. Have not pulled anything with it yet, but with the C6 tranny I think I am set for a while, Thanks to all those that offered advice. Next its on to the famed gas float problem in the tanks. Good day to all
Joe
Joe
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From: torrance
Well I'll be damned! Never, ever, ever, heard of adjusting lifters by torque! Just goes to show that no matter how much you think you know, that you don't know everything.
Where did you find this information, Joe?
And thanks for the education.
Chuck
Where did you find this information, Joe?
And thanks for the education.
Chuck
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From: Texas
Got a guy that works for me who used to work at a Ford dealership, he has about 4 trucks himself and is currently into the powerstroke stuff. He is my best Tech and an excellent Ford guy. Told me he never set the valves on a ford Straight six. Just runs them down and torques them, and claims to have never had one go bad. Well, I did it and it worked, now mind you it is a 6 300 with Bolt on rockers. But took it for about 20 mile run, pushed it hard and not a lifter tick one!!! I to could not believe it but after many heated argument with him I took his advice. Now I owe him lunch
Joe
Joe
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The early heads had straight 3/8 studs and required adjusment the later heads have a stud which has a 5/16 nut on it and you bottom that out against the shoulder on the stud where it goes to 3/8 in. diameter. I worked for a guy who wanted the straight studs in replacement heads and he couldn't get them. he couldn't understand how Ford could get the setting right on the later stud design. kotzy
