Ebay timing chain kit

[LittleM@n]

A

[Bluevitz-rs]

Originally Posted by LittleM@n

A

Oh I understand now...

[invader166]

During my time as an engineer on various ships trading around the great lakes, as far as I can remember, in almost all power-trains, a chain will stretch far before a sprocket will wear-out.

Here's an excerpt from one of the large bore Sultzer engine manual:

With regards to the chain:

Wear on the chain pins, bushes as well as the chain sprockets can all lead to a slackening off of the chain. This can lead to 'slap' and changing of cam timing.This alters the leads of the fuel pumps and exhaust valves.. The degree of angular displacement by checked using the manufacturer supplied poker gauge.

Chain damage occurs if the chain is too tight or too slack and the result is fatigue cracking of the links. If the tension is too tight, then this adds to the working stress of the chain. Insufficient tension leads to 'slap' with resultant damage to chain and rubbing strips. Vertical misalignment of the sprockets means rubbing at the side plates resulting in reduction of thickness and possible failure.

Recommended limit on stretch is about 1.5 to 2%, if max. movement of the tensioned is reached before the chain has reached its max. stretch then a pair of links may be removed. When max. stretch is reached, or if the chain shows signs of damage then the chain should be replaced.

And with regards to the sprockets:

If you look at the faces of the sprocket teeth you'll see an indication of the amount of wear that has already occurred. This will be seen as a polished worn strip, about the pitch circle diameter, on each of the teeth as shown in the diagram.



If the depth of the wear, X, has reached a value equal to 10% of the dimension Y, then the sprocket has reached the end of its life and needs to be replaced. It's worth pointing out that low cost, poor quality sprockets on most industrial applications are a false economy. A good quality sprocket should last through the life of several chains before anything like the amount of wear shown here will have occurred.

These are generally good references.

[IllusionX]

Originally Posted by Bluevitz-rs

Oh I understand now...

There is another post before his 'A' post that admins required to approve before we could see it. funny.