Bar discoloration normal

[ErnieG]

So I've ran this new bar and chain setup roughly two tanks and it started showing discoloration on the bottom .
I'm getting plenty of oil delivered to the bar ..I do notice the oil splatter off the tip and I'm using about 3/4 or a bit more per tank of gas and the chains not over tight either .
I did notice a very small burn between the chain and bar that I can catch a finger nail on ...only on the bottom .
One thing I did notice on these TsuMura bars is a thin protective coating of some sort ..may possibly be causing this .
What's your thoughts...should I be concerned ..just doesn't seem normal .
Ernie

 

[Squareground3691]

I’m assuming it’s a rust preventative like a clear coat if ur bar edges are not producing a severe burr wouldn’t worry about it

 

[ErnieG]

I’m assuming it’s a rust preventative like a clear coat if ur bar edges are not producing a severe burr wouldn’t worry about it

Doesn't seem sever..very slight
Ernie

 

[fishdrivel]

So I've ran this new bar and chain setup roughly two tanks and it started showing discoloration on the bottom .
I'm getting plenty of oil delivered to the bar ..I do notice the oil splatter off the tip and I'm using about 3/4 or a bit more per tank of gas and the chains not over tight either .
I did notice a very small burn between the chain and bar that I can catch a finger nail on ...only on the bottom .
One thing I did notice on these TsuMura bars is a thin protective coating of some sort ..may possibly be causing this .
What's your thoughts...should I be concerned ..just doesn't seem normal .
Ernie

What kind of bar oil are you using?
Might consider "cleaning" the burn marks off and see if it comes back?
Are you over-tightening the chain?

 

[ErnieG]

What kind of bar oil are you using?
Might consider "cleaning" the burn marks off and see if it comes back?
Are you over-tightening the chain?

I use the TSC brand oil ...I know maybe it's not the best oil but it's what I have.
I will switch oils and see if it makes a difference.
Chains not over tight ...that's what I thought was causing it and I checked it several times during use .
Ernie

 

[Squareground3691]

As long as ur bar slinging oil off of it on the ground so u can notice it and keep a sharp chain no. 1 .

 

[ErnieG]

As long as ur bar slinging oil off of it on the ground so u can notice it and keep a sharp chain no. 1 .

Yea I can see the oil slinging off the tip when I hold it up to the wood ...even after I shut the saw down and check the chain I can see oil on the drives and bar groove .
Ernie

 

[fishdrivel]

I use the TSC brand oil ...I know maybe it's not the best oil but it's what I have.
I will switch oils and see if it makes a difference.
Chains not over tight ...that's what I thought was causing it and I checked it several times during use .
Ernie

Would be odd on a new saw but sometimes the chain can "climb" the sprocket on either end of the bar.
A worn countershaft sprocket has grooves and chains will tighten if they climb out of the groove.
The nose sprocket has bearings and these can go dry. Are you greasing the nose? They also break.

 

[ErnieG]

Would be odd on a new saw but sometimes the chain can "climb" the sprocket on either end of the bar.
A worn countershaft sprocket has grooves and chains will tighten if they climb out of the groove.
The nose sprocket has bearings and these can go dry. Are you greasing the nose? They also break.

It's a Husqvarna 372 OE I recently redid .
Sprocket looked good but maybe not knowing the history I can replace it .
I haven't greased the sprocket on this particular bar but to grease or not to grease is a whole nother topic I certainly don't want to start ..lol
I'm certain that I'm getting the correct quantity of oil but maybe not the quality.
Ernie

 

[buzz sawyer]

Never had a problem with TSC bar oil. I am surprised to see that much burr after two tanks.
1. Are you sure the chain is still sharp? Have you touched it up at all?
2. Are you leaning on it hard in the cut?

 

[heimannm]

What sort of wood are you cutting? Sometimes sap or moisture in the wood will tend to stick/burn to the bar from normal cutting activities. Did you try cleaning it off? Is it something stuck on the bar, or have the rails actually been heated to the point they changed color?

And I'll second Buzz's comment on TSC bar oil, I have cut a lot of wood over the years with their oil and never found it to be a problem.

Mark

 

[ErnieG]

Never had a problem with TSC bar oil. I am surprised to see that much burr after two tanks.
1. Are you sure the chain is still sharp? Have you touched it up at all?
2. Are you leaning on it hard in the cut?

Yea chain cuts very well ..it's practically brand new .
I don't think I lean to heavy in the cut but it's possible I guess .
I will have to take more notice on that
Ernie

 

[ErnieG]

What sort of wood are you cutting? Sometimes sap or moisture in the wood will tend to stick/burn to the bar from normal cutting activities. Did you try cleaning it off? Is it something stuck on the bar, or have the rails actually been heated to the point they changed color?

And I'll second Buzz's comment on TSC bar oil, I have cut a lot of wood over the years with their oil and never found it to be a problem.

Mark

I was cutting mostly older red oak and it's very hard to say the least with some older maple and ash .
Being older wood I don't think there would be any sap in it ..just alot of moisture .
Ernie

 

[Squareground3691]

If u chain is sharp u should be able to lay bar on the log with one hand crack the throttle and bar should sink into wood with no effort

 

[ErnieG]

A very light piece of scotch Brite and a little carb cleaner seems to remove most of the discoloration...I'm thinking now after seeing this it's just the protective coating on the bar that's making it look burnt .
Ernie

 

[ErnieG]

Looks like plenty of oil also..

 

[LuDookie]

Looks like plenty of oil also..

Looks like the cutter in this picture is rounded off. It’s it? Or just blurry?

 

[SteveSr]

Looks like plenty of oil also..

That cutter doesn't look sharp and the side plate angle is too vertical. Need to check your sharpening.

 

[ErnieG]

These pics better of the cutter ...
This is a Oregon 72exl chain with only two tanks ran on it .

 

[LuDookie]

Not seeing much of a hook or point in these pictures. A full chain will heat a bar up quickly even with the best oil.