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Old 09-18-2005, 12:30 PM
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Correct Timing Chain Tension

Hello,
I need some expert advice.
For a week now, I have went through two timing chains because of listening to what someone else said. I am not sure they were right though.
I am rebuilding a sbc 350 with a 4bolt main. All the machine work was done by NAPA.
In any event, could someone tell me what the correct tension is suppose to be for a newly installed double roller timing chain?
In my case, when I hung the chain on the crank sprocket/w camshaft sprocket attached, it bolted right up with no problem. I installed it "dot to dot." That is not advance or retarded, I just left it at the manufacturer setting.
Now that it is installed(I do not have any pistons in yet, just crank and cam), I can spin the crank freely without any binding in the timing chain or anywhere else. The problem is that the chain itself it tight, no play whatsoever unless I apply light pressure by hand to deflect it a little. Is this normal tension? I am afraid of wearing out cam bearing prematurely.
Can any one help?
Thanks,
rob

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Old 09-18-2005, 01:38 PM
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NAPA???
Thats the way its supposed to be, I know the one you took off had lots of play, but the new one should be tight. it will stretch in just a few miles. I would suggest however that you take it back off until you have all the rotating assembly installed. I prefer to leave everything else alone until each cylinder is finished and fit just perfect. crank rods and pistons are the most important part of the motor.
have fun.
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Old 09-18-2005, 02:55 PM
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Correct Timing Chain

I Know That Between The Cam Gear A Crank Gear Put A Striaght Edge On Them And With A Feeler Gauge And See The Clearence. If It To Excessive It Wth Cause Permature Chain Ware Specialy If It's A Roller Cam. I Don't Know The Clearence On Roller Cam Or Flat Tappet But Call Comp Cams They Will Give You Some More Info On This.


Comp Cams Number- 1-901-795-2400
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Old 09-18-2005, 06:57 PM
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I've done some that when installed, were as tight as a banjo string while others had a very small amount of movement side to side. Didn't pay it much attention and all of them ran fine, but then again, I wasn't building a funny car engine either.
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Old 09-19-2005, 09:00 AM
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The variation comes from crank aligned engines, cam bore resizing, bearing thickness, core shift, as well as manufacturer tolerances on the block and crank.

How tight should it be? I'll call it snug. Anything but floppy.
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Old 09-19-2005, 09:54 AM
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ok, that makes me feel a little better. I am going to leave it alone; however, I am going to take the timing chain back off and put pistons and rods in, then put the chain, cam button back on.
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Old 09-19-2005, 03:20 PM
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Why? Just more work
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Old 09-20-2005, 09:43 AM
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yep, your probably right.
thanks for your help
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