To drill or not to drill ?
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From: Texas
To drill or not to drill ? Received my RollMaster double timing chain yesterday and I checked last night to see if the dowel on the cam would fit the gear.
Well needless to say I wasn't going to force it in and it looks like its going to be relatively tight.
So should I drill the ***** out or just leave it and hope that the cam bolts pull the dowel in straight.
Well needless to say I wasn't going to force it in and it looks like its going to be relatively tight.
So should I drill the ***** out or just leave it and hope that the cam bolts pull the dowel in straight.
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From: Bailey, Co
Re: To drill or not to drill ?
i wouldnt drill anything. tighten the three cam bolts down evenly with a little grease or lube on the dowel on the cam. you should be fine! 
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Re: To drill or not to drill ? I say drill it and de-burr the holes, but use number drills, not the fractional sizes so you can get the hole the right size. The fractional sizes are spaced too far appart; i.e. one size is too small, the next is too large. I agree with the other post that said you may get it stuck half way on; you don't want that.
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From: Bailey, Co
Re: To drill or not to drill ?
dont drill anything
What harm do you see this causing? NONE!
I installed a TR224 cam on a buddy's car a few months ago, and the cam dowel was too big to fit the hole. We tried to "pull" it on by tightening the 3 cam bolts, but it was obviously too small to fit and almost got stuck on (it was actually shaving the dowel pin down). You are going to want to be able to get it off gain if you have to. We drilled the hole out to exactly the size we needed. This did not change or compromize the integrity of the cam or sproket.
Its not going to hurt anything. Just don't over drill it.
Re: To drill or not to drill ? I wouldn't unless thats your last option....(mine went in fine....)
if you have to drill it, use number drills and make sure you hit it straight on....that way you won't go to big or make it off set....
if you have to drill it, use number drills and make sure you hit it straight on....that way you won't go to big or make it off set....
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From: Texas
Re: To drill or not to drill ? Well, I'm kinda confused here - guess its going to be a judgment call when Its time for installation (kinda what 2001CamaroGuy said). IF I have to drill a brand new timing chain then I'm going to have to find a drill press, no way am I going to attempt to drill with a hand drill 
.
Has anyone thought of emailing RollMaster (Australia mate) and asking them if they recommend drilling their gear to achieve proper fitment ?
Lastly, I don't remember reading within the instructions that if the dowel doesnt fit drill a larger hole to achieve desired results
.Has anyone thought of emailing RollMaster (Australia mate) and asking them if they recommend drilling their gear to achieve proper fitment ?
Lastly, I don't remember reading within the instructions that if the dowel doesnt fit drill a larger hole to achieve desired results
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From: Bailey, Co
Re: To drill or not to drill ? I'm not putting any blame on Rollmaster, or anyone else. But, the fact of the matter (in my situation), was that the problem was the dowel on the cam, NOT, the hole in the sproket. We tried fitting the stock sproket on as well, with the same outcome. That is why we drilled out the hole. There seemed to be little alternative.
YOU may not have to drill anything at all. But there is nothing wrong with a little constructive adaptation here and there.
YOU may not have to drill anything at all. But there is nothing wrong with a little constructive adaptation here and there.
Launching!
Joined: Aug 2002
Posts: 281
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From: Sherwood, AR
Re: To drill or not to drill ? FWIW, we did the Rollmaster on our thunder racing 224/224 cam, and it fit perfectly. No drilling required.
If you got it from SDPC, you may want to contact them first before drilling.
If you got it from SDPC, you may want to contact them first before drilling.
Re: To drill or not to drill ? this has got me worried now. i have the rollmaster double also for my install. and i read somewhere that the person just used a 1/4" drill and it worked fine. I measured my cam dowel and it was .249" and the hole in the sproket is .248". so thats .001 to small. so i figgure drilling it with a bit thats .250" (1/4) would be alrigth would give you an extra .001" of play. My cam is a TR227/224
JR
JR
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From: Bailey, Co
Re: To drill or not to drill ? Like I said, some people I'm sure won't have to drill anything. If you do though, it is not a big deal. Again, don't over drill it, but .001 is nothing. Should you have to drill it? NO. You shouldn't have to drill anything that is suppose to be a stock replacement. But if you do, it will be fine. Its not going to open Pandora's Box or The Gates of Hell. 
As said before... The stock cam dowel fit both the Rollmaster and the stock sproket (of course). It was the after market cam dowel that didn't fit either one.
As said before... The stock cam dowel fit both the Rollmaster and the stock sproket (of course). It was the after market cam dowel that didn't fit either one.
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From: Texas
Re: To drill or not to drill ? Whats that sound I hear, a drill .....
Guess Im going to drill it .250 to avoid any headaches. Thanks for the replies guys, basically it comes down to tolerances in design and some are lucky and obviously I'm not.
I'll post a pic once all is said and done
Guess Im going to drill it .250 to avoid any headaches. Thanks for the replies guys, basically it comes down to tolerances in design and some are lucky and obviously I'm not.
I'll post a pic once all is said and done
