Tension rattle at start up, solution?

[Cdy291]

Even with new guides and tensioners, and synthetic oil with a MC filter, I still get timing chain rattle from the rear tensioner at start up. It got me to wondering why the rear tensioner doesn't have the oil reservoir on it like the front one does? If it did it wouldn't have to wait for the oil to get to it to firm up. Has anyone ever tried to put a front tensioner on the rear?

 

[2000StreetRod]

front vs rear tensioner

I also had cold start chain rattle after replacing my camshaft timing components. I eliminated the start up rattle by installing a pre-oiler.

As I recall the length of the front tensioner from the hex shaped seating face to the end of the cylinder bore is longer than that of the rear tensioner.

If the length front tensioner (when installed in the rear position) is enough that the piston cannot move in the cylinder bore then the cassette guide assembly will rapidly break. However, the precision tensioning tool in the OTC 6488 kit is used for tensioning both the front and rear cassettes so maybe it is possible.

I suspect the reason the front is quieter than the rear at start up is due to oil from the pump getting to the front piston sooner.

 

[Cdy291]

What pre oiler did you use?

 

[2000StreetRod]

pre-oiler

What pre oiler did you use?

I wanted to install an electric pump but couldn't find a suitable one at the time so I installed an Accusump. See my signature for more information.

 

[wakeboardnmoto]

Thanks