Timing chain slap

I have just done 3 tensioners and a timing chain. It looks like something is causing the chain to stretch out a little and start slapping the tensioner guide.

Any ideas of what could cause this? It is not a stock motor, everything has been done on it.

My next guess is the adjustable timing gear is a little wacky. Maybe something is set on there a little bit off?

Throw me some ideas!

 

This isn't very detailed but this is what is in it. I have factory timing set coming in on Tuesday. I am taking the adjustable off and setting it up with factory stuff and turn it by hand.

Right now if I turn it by hand, it will get tight then a couple rotations later it gets loose...

It is only the passenger side that is having problems as well.

 

They are hydraulic tensioners, so yes you would be correct. But that is not my problem.

It seems like something is not lined up or perfectly centered. I am guessing the problem is in the cam gear..

 

Yes, this is what I am thinking too. I have heard that the aftermarket world for these motors and timing parts are kinda a nightmare.

I have also read that the factory cam bolts do not do well with aftermarket sprockets.

 

Are you talking about the surface of the head that makes contact with the block? Or are you referring to the hole that gets covered up by the tensioner when bolted up?

Are you saying these need to be plugged, so it does make pressure? I am noticing that when I rotate the motor over by hand, the driver side has oil dripping out of the tensioner and down the arm while the passenger side does not have this happening.

I think you are on to something!

 

Yes, the galley directly behind the tensioner is free to flow oil. But like you said, if the bottom part is not plugged up then the pressure is not building.

If this is it, I am one lucky person. I can't believe the chain did not jump...

 

one of these holes?

 

Makes sense, one side it open and one side is closed. But I can't remember which head ended up on which side.

I am about to go check it out.

 

You are a genius! The plug is missing! I'm going to go pick one up and out some new chains and tensioners on there and get it back together. Hopefully the front cover doesn't leak as much too!

I'll update if this stopped the problem.

 

I can't believe I looked over this, definitely could have ruined the motor. Definitely a wake up call for next time. I just assumed they would be good since I had the heads assembled by a machine shop. Shame on me for not checking.

If I could, I would send you a six pack of your favorite beer!