Topic: three bolt cam gear - torque?
rebuilding has begun! ...so here come the first of many newb questions.
I haven't come across any specifications for the tightness of the three cam bolts that attach the gear.
anyone?
-biggie
Re: three bolt cam gear - torque?
biggie: What size bolts are used? There should be a good metric torque table for just about any size of metric fastener. I use this one a lot: http://mdmetric.com/tech/torqcht1a.pdf
Or give these guys a call: http://www.wolfgangint.com/Parts/Engle+ … ts/Type+5/
Just remember that the torque readings are probably for steel to steel connections....not like the soft alloy of the cam gear you may have....Unless you have a steel cam gear. Wolfgang can probably remove all the mystery.
Clancy
Re: three bolt cam gear - torque?
The torque spec doesn't depend on the gear material since it's not threading into the gear. This is why the bolts come with the cam, and all my cams also cam with a spec sheet that included torque value among other things. Scat recommends 18-20 ft*lbs for their cams (found online), my CB and Webcams both called for 23 ft*lbs. --Ryan
Re: three bolt cam gear - torque?
Ryan: Thanks for the clarification. Is it possible to overstress the alloy of the gear by torquing too much on the bolt-to-camshaft connection? Looking at some of the gears out there, it appears that the holes may be countersunk a bit and the bolt holes are somewhat thinner than the rest of the gear....But I guess that since the alloy would be in 'compression' that the risk should be small.
Clancy
Re: three bolt cam gear - torque?
They are counter bored and come with washers the same size as the bore, diameter and thickness. As long as the underside is fully supported (it is) the bolt will break before the gear is damaged by compression in this manner. Things would be different if a washer were not used, but the washers are always used. --Ryan
Re: three bolt cam gear - torque?
I dont have any washers... and I had to buy the bolts seperately since they didn't come with the cam....
-biggie
Re: three bolt cam gear - torque?
Yeah when you use a stock gear counter boreing is neccessary so that the bolt head can clear the oil pump !
Also As I use a lott of Stock gear's my machinist will counter bore the gear and then hand's me what I beleive or remember to be 10.8 bolt's and a Teethed washer's !
Ah Hell Frikin know ? I ever mention Ive had 6 skull fracture's at one time ?? Multiple Concussion's on Several different occassion's ?? Sometime's I pull complete blank's !
Serrated washer's cause I yelled at my Kidd ? But there serratted and have like teeth ! The washer's not the Kidd ??
You need these washers and the right Dia. shoulderd bolt . and red
Loctite !
Also note that the camm gear timming mark and slot and bolt need to be aligned when installin gear to Cam .
What gear you usin ?
Also as long as were on camm's check the stud's on the fly wheel end of the case that are on both side's of the cam journal !
On used case's these are famous for pullin the thread's out of the case when you torque the cover side of the case down .
Double nut check that they will torque and that there arent a bunch of threads stickin up where they thread intoo the case half ?? << If you turn the stud's in any Check there gonna be long enough to nut washer once cover side of case is installed .
Now as long as were on the cam check cam journal's for Burr's on the thrust etc . << can cause tight spot on Camm thrust and spin ripp tear camm thrust bearing ?
Also what about Lifters ???? <<< May need to be clearanced for Engle 110 or the 218 Webb ? So where did your lifters come from ?
Can crack lifter bores ! Think Blip , Blip , << Meant you visualizeing, lifter and valve in action !
Not refering to my Damaged Brain Synopsis ?? LMAO My Cousin think's Bull Ridin is the chitt ! Go figure !
Ok Im Done ! Another wasted Day !
Sean
Re: three bolt cam gear - torque?
Cam bolts should be grade 10 or higher and even with a counter bore in the gear most people still need to clearance the bolt heads just a hair to clear the pump body. .040" min clearance on all moving parts is your target.
Then like I said, the counter bore in the gear needs to be sized to the OD of the washer and cut to the same depth as the washer is thick. The washer itself should be have an ID that nearly interferes with the threads on the bolts used. All this is supposed to be a tight fit even before torquing the bolt down to ensure the cam and the gear remain attached no matter what.
I don't know what to tell you if your part didn't come like this, I'd ask the supplier or find a new one. --Ryan
http://www.cbperformance.com/catalog.asp?ProductID=61 - Don't use the locks, use a drop of red loctite.
http://www.cbperformance.com/catalog.asp?ProductID=60
http://www.cbperformance.com/catalog.asp?ProductID=1083
Re: three bolt cam gear - torque?
Yupp what Ryann said !
Also be aware youve changed the gear << Might not be or probably wont be in same posistion as the Other gear and Camm !
Mean's Most Lobe posistion on Camm May be affected ! Mean's definately need to Degree your Camm .
Did Camm come with Degree chart ?
Sean