maybe this should be in "racing", but:

Has anyone had any trouble getting thier dual roller chain to line up (as in distance away from the block)?

I purchased a dual from Hughes Performance and just a mock up in place over the weekend looks like they aren't going to be even.

I have never had any trouble with setting one of these up.

Is the lower(crank Gear Bottomed all the way against the shoulder of the crank? If not the sprockets will not line up.

I have hears of the small(cranK) gears being a bit too tight for the intended press fit.
The soultion - take some sandpaper and hand hone it a few microns Bigger.

Also make sure in your mockup that the cam gear is all the way on the cam and it is bottomed against the block face.


Anyone else got $.02?


Greg

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http://www.youtube.com/hyperpack

my crank gear bonks against the shoulder fine (with an inch or so left behind it towrds the block), and the cam gear is set right against the block, but this makes the cam gear an inch or so farther back than the crank. how is the chain going to line up?

Not to be funny, but because I have never seen these double roller chains, is it possible to have the crank sprocket flipped over backwards?

Jerry

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There's a difference between ignorance and stupidity.
Ignorance is not knowing any better.
Stupidity is knowing, yet doing it anyway.

checked that. there is a shoulder machined into the crank gear that lines up with the shoulder on the crank.

stops right at the crank shoulder, and leaves quite a bit of room behind it, too much actually. makes the cam gear look a mile away towards the block.

This makes no sense. Can we get a picture?

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Joshua

I am going to guess and say this is your anwser. Unless they have givin you the wrong bottom gear. You dont by chance have a cast crank engine do you, I dont know if there is a diff but thats the only other thing I can think off besides Gregs post.


Jess

it fits ON the crank fine (diameter). the problem is the depth of fit.

the crank gear is about an inch away from the block when pressed up to the shoulder.

the cam gear goes tight against the block.

this means that the gears are not in the same plane (depth) and the chain will not line up.

makes me think one of the gears is wrong. I was just asking if anyone had seen this before.

There is a Champher on the back side of the crank gear, to allow for the radius on the crank. If this gear is on backwards, it will not go back flush.
Is it possible you got a timing set for a big block? I know the crank gear and the chain are the same for the slant and BB. The cam gear is different. I don't know what the differece is, but maybe it is the "depth". I have a couple of engines on the stand, without timing covers, but the all have the "stock type chain".
It would be much easier if you could post some pictures.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

I think at this Point You need to show a pic.

I can only think that now, If you have read charrile s's Post and you have the lower sprocket in the correct direction that we might be discussing the " Press fit Shoulder" versus the "real Shoulder where the Gear will actually bottom out on.

The Press fit shoulder is slightly larger than where the Harmonic balancer presses onto. There is a little depression ring cut in the crank then the crank steps up for the timing gear press fit.

You are Pressing the gear all the way onto the second shoulder? correct?

Not trying to insult, just trying to figure out the problem to find you a soultion.

Post a Pic to be sure.


Thanks, Greg

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http://www.youtube.com/hyperpack

Doesn't the big block cam gear have three bolt holes in it?

The slant gear is supposed to have only one hole (I have seen them with two but the correct hole is usually marked "DOWEL".)

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

The stock BB cam gear has a dowl pin hole, and a single bolt. The performance gears/cams have either 1 or 3 bolt, your choice.
A FYI, small blocks use a key/keyway and a single bolt

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

no offense taken guys, I am open to any explaination.

I knew there was a right and wrong way to put the gear on, but I wasn't aware of the BB and slant sharing sizes. I will need to research this more.

I will do my best to get a picture, but my home internet is down until I get a better computer than that boat anchor gateway I have, so I need to take a pic with a regular camera, get it scanned, then upload it so it may be awhile.

I'll let you know when I can.

This is a "red flag" for me, Hughes Perf. = BB Mopar. (and some other things that we won't get into)

Does the top cam gear have a tall "cup" that fits over the end of the camshaft or is it flat?
DD
Here is what the installed set should look like:

thanks for the picture mr. dutra!

that looks like mine, except I don't have as many "breather" openings in the cam gear. I have maybe half that (I am at work right now so I don't have it in front of me).

the box it came in was labeled for a slant six, with the right year too (75). I realize that doesn't mean much anymore.

your crank gear is all the way back, whereas mine isn't. thats the problem. how did you press yours?

it also looks like your cam gear is going to scrape the block. is that how it normally looks then? mine lines up the same way (with the bore to bring the cam out a bit, but if I remember right the hole for the bolt was too big) but it looks spooky like its going to hit the block.