RAD5

I purchased a Summit double roller timing chain set P/N SUM-G6601 and after getting it almost installed I noticed the the hamonic damper won't seat far enough due to the thicker crank gear and leaves the pully out too far! Has any one else run into this? Or is it just this part?

Apeiron

Are you sure you have the timing sprocket installed correctly?

Damon

Used them several times replacing the stock chain- no alignment issues. The bottom pulley will have a recess in it, where the stock single-row pulley is actually bubbled out a bit. Mic them for distance between the flat where they rest against the crank shoulder and outter face where the balancer contacts if you have a concern.

I just measured the a factory-stock single-row timing chain bottom gear from a 92 roller cam motor and compared it to a typical cheap-o double roller flat tappet timing chain set I had laying around....

Factory bottom gear: .523"
Cheap-o chain set gear: .520"

Only .003" difference between 2 chains that are as different as you can possibly get in a small block. Not enough to write home about.

RAD5

I am pretty sure I have the crank gear seated properly, the chain and the cam gear is lined up properly. It is a Summit set for roller cams and I did not see a recess in the crank gear. I will pull the crank gear and mic it to the original. I am almost positive it's quite a bit thicker.

Apeiron

Since you can't see through the timing cover, are you sure the balancer is bottoming out against the sprocket?

RAD5

Well I thought it was not seating so I took it off and reinstalled it. I am using a damper install tool and I crank the damper in until I can't crank it in anymore. When I had the damper off I could see the crank gear and it's not very far behind the cover. It has to be the only reason the damper is out too far.

RAD5

This is what I have and looking at the image it looks like the crank gear is recessed to allow the damper to seat far enough, however mine does not look like that.
http://store.summitracing.com/partde...1&autoview=sku

Apeiron

It's not on backwards?

Damon

You can see the recess on that chain set clearly in the photo. It's the shiny part around the area of the crank keyways. That recess goes towards the inside of the motor (towards the shoulder on the crank).

In that phot you're looking at the back of the chain set- the side that would face the engine.

RAD5

Yeah, I am guessing that is the side that goes toward the engine by looking at the cam gear. I thought I had it on the right direction because the the timing marks were facing out. I am going to work on it later today hopefuly find out what's up. I'll let you know what I find. Thanks!

randomguy121

somtimes if you put the keyway in to far before tighning it will slip sideways and put it in a bind? is that happening?
and also if you are somehow not usung enough washers behind the bolt the bolt will bottom out before the pulley is installed fully???? i had to add washers to mine once because i lost the thick stock one.

if the keyway binding is the issue tyr rutting it on without keyways to see if thats the problem. if it goes on without keyways well then, theres your answer
get the pulley started then when youre done tigning it tap the keyway all the way in or flush. this can happen with both the pulley and the gear. if all else fails have somoene try it. somtimes other peoples luck just works out better hahaha. i call it the black magic of hotrodding. kindive a wierd phenomanon, but iv spent days on somthing and have some drunken idiot walk up and put it on.

RAD5

Ok I figured it out and I feel like an idiot. After checking out the thickness of the crank gear (it was only a little thicker than the original) I noticed that with the timing cover off the harmonic damper was not seating all the way. I though it was seated because I could not crank it in with the tool anymore. So after going crazy wondering way I could not get the damper pressed in all the way, come to find out it was the f-ing tool! I noticed the threads were messed up and not allowing me to crank the damper in any farther. After fixing the threads it went right on. I took it in the johnson with that one