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Hole in new timing gear !! #263619
03/23/09 05:32 PM 03/23/09 05:32 PM
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Murrayville, Illinois, usa
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scotts66charger Offline OP
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I am replacing an old timing chain and gear set, with a new Edelbrock doub;e roller set. the old gear(Cam gear) has a off centered hole in it, and then new one does not. The hole in the old one, is drilled at an "Angle" not straight through like a drill press would be able to do. My question is, Is the hole maybe for " Oiling" something, and if so, do I need to have a hole drilled in the new one to match ? thanx. scott
Re: Hole in new timing gear !! [Re: scotts66charger] #263620
03/23/09 08:53 PM 03/23/09 08:53 PM
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North Dakota
6PakBee Offline
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small block/big block?

"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: Hole in new timing gear !! [Re: 6PakBee] #263621
03/23/09 10:20 PM 03/23/09 10:20 PM
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Murrayville, Illinois, usa
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scotts66charger Offline OP
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It is a BB, 440.
Re: Hole in new timing gear !! [Re: scotts66charger] #263622
03/24/09 06:44 AM 03/24/09 06:44 AM
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North Dakota
6PakBee Offline
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You have to have a hole in the cam gear for the locating dowel on a B/RB camshaft nose. Something doesn't sound right here.

"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: Hole in new timing gear !! [Re: 6PakBee] #263623
03/24/09 08:04 AM 03/24/09 08:04 AM
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the boonies
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a picture would help
Re: Hole in new timing gear !! [Re: aarcuda] #263624
03/24/09 01:16 PM 03/24/09 01:16 PM

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Are you sure it's not an adjustable, offset, advance/retard sprocket? (They are NOT 'gears')
Re: Hole in new timing gear !! [Re: scotts66charger] #263625
03/24/09 01:21 PM 03/24/09 01:21 PM
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Posts: 9,436
Blair County,PA
62maxwgn Offline
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Quote:

I am replacing an old timing chain and gear set, with a new Edelbrock doub;e roller set. the old gear(Cam gear) has a off centered hole in it, and then new one does not. The hole in the old one, is drilled at an "Angle" not straight through like a drill press would be able to do. My question is, Is the hole maybe for " Oiling" something, and if so, do I need to have a hole drilled in the new one to match ? thanx. scott



That hole is for lubrication to the back of the gear.
Re: Hole in new timing gear !! [Re: 62maxwgn] #263626
03/24/09 03:25 PM 03/24/09 03:25 PM
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North Dakota
6PakBee Offline
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Quote:

Quote:

I am replacing an old timing chain and gear set, with a new Edelbrock doub;e roller set. the old gear(Cam gear) has a off centered hole in it, and then new one does not. The hole in the old one, is drilled at an "Angle" not straight through like a drill press would be able to do. My question is, Is the hole maybe for " Oiling" something, and if so, do I need to have a hole drilled in the new one to match ? thanx. scott



That hole is for lubrication to the back of the gear.



The thrust face on the gear is lubricated from the #1 cam journal. Why would you need another hole and how would it lubricate the back in any event? Just asking.

"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: Hole in new timing gear !! [Re: 6PakBee] #263627
03/24/09 03:44 PM 03/24/09 03:44 PM
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Lincoln Nebraska
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RapidRobert Offline
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Certainly not for balance, not for (rear side of chain) oiling as the oil drips from the rear(oiling hole) and from the cam bearing as mentioned. I havent seen a pic but I dont know if it's to sling oil forward to the eccentric (which is sorely needed) but it's an extra machining step thats incorporated in there for a good reason(time is money) & money is #1. Wouldn't make sense that they are hung on pegs as they are on the assembly line.

live every 24 hour block of time like it's your last day on earth
Re: Hole in new timing gear !! [Re: RapidRobert] #263628
03/24/09 04:07 PM 03/24/09 04:07 PM
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Florida
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there is a one bolt cam for B/RB engines

and a 3 bolt cam for B/RB engines

example would be you need a 3 bolt cam to run a gear drive on a B/RB engine

there is a dowl pin hole in the gear for alinement also

is this the hole you speak of?

pics?
Re: Hole in new timing gear !! [Re: scratchnfotraction] #263629
03/24/09 04:19 PM 03/24/09 04:19 PM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

pics?

yes inquiring minds want to know

live every 24 hour block of time like it's your last day on earth
Re: Hole in new timing gear !! [Re: RapidRobert] #263630
03/24/09 04:21 PM 03/24/09 04:21 PM
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Florida
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I could be wrong I dont do BB

I am going by what I read for a gear drive for a BB said it need a 3 bolt cam

and some are listed as a one bolt

I have seen some with the dowl pin in the end of the cam aslo so....

we need pics...this post is worthless with no pics

Re: Hole in new timing gear !! [Re: scratchnfotraction] #263631
03/25/09 11:50 AM 03/25/09 11:50 AM
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Murrayville, Illinois, usa
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scotts66charger Offline OP
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I tried to send a picture to you guys to look at, but it said the file was to big? Anyway,the first hole is for indexing the gear to the cam, but the second hole is drilled at an angle, like to maybe sling oil or ?? It is straight across from the small indexing hole. scott
Re: Hole in new timing gear !! [Re: scotts66charger] #263632
03/25/09 11:57 AM 03/25/09 11:57 AM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

but it said the file was to big?

take a new pic & have the camera create a small pic file, get it on your computer then it will be small enough to go thru as an attachment. We need to see this

live every 24 hour block of time like it's your last day on earth
Re: Hole in new timing gear !! [Re: scotts66charger] #263633
03/25/09 12:15 PM 03/25/09 12:15 PM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
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This it? If it came from the factory (edelbrock factory) I'm sure it's ok and it supposed to be there. Just put it on and go.

5117804-edl-7800.jpg (46 downloads)
[IMG]http://i66.tinypic.com/pui5j.jpg[/IMG]
Coming soon!!!!
Re: Hole in new timing gear !! [Re: Mr.Yuck] #263634
03/25/09 03:42 PM 03/25/09 03:42 PM
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Florida
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scratchnfotraction Offline
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thats the one I am a talkin bout

3-bolt gear with a dowl pin

dont know about the angle hole though,

see if you can send it to my e-mail

68dodgeman@earthlink.net


Re: Hole in new timing gear !! [Re: scratchnfotraction] #263635
03/25/09 04:32 PM 03/25/09 04:32 PM
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Central Coast, Calif.
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Snoopy Offline
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The hole is probably for additional cam chain lubrication. Is the hole drilled at an angle from the thrust area on the back of the sprocket outward to the front side? Centrifugal force would carry the oil from the center out to the chain.
They probably stopped spending the extra money when they figured the oil from the cam bearing supplied enough oil to get the job done.
Re: Hole in new timing gear !! [Re: scotts66charger] #263636
03/25/09 06:04 PM 03/25/09 06:04 PM
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Rio Linda, CA
John_Kunkel Offline
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Here's a pic of a single-bolt double row sprocket with an extra hole as described in the OP, it has the Mopar casting number but also has an etched part number "S-380".

5118518-Sprockethole.jpg (45 downloads)
Re: Hole in new timing gear !! [Re: John_Kunkel] #263637
03/25/09 06:05 PM 03/25/09 06:05 PM
Joined: Jan 2003
Posts: 25,786
Rio Linda, CA
John_Kunkel Offline
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Here's the sprocket with a 1/4" drill bit installed to show the angle of the hole.
Re: Hole in new timing gear !! [Re: John_Kunkel] #263638
03/26/09 08:28 AM 03/26/09 08:28 AM
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Florida
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yep, I would say for t-chain oiling

I got the pics th op sent me,and was thinking with snoopy

the drill bit gives a clear veiw of the angle,which I could not see in the op pics
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