Fin loss on cylinder, how much is too much?

[fearofpavement]

I have a couple of MS460's that one of my chainsaw customers brought to me. He wants me to take both of them and make one good saw. He said he's ok with aftermarket parts.

Well, they were both run over by a skidsteer when nearly new. Problem is that most of the same parts are damaged. They both need top handles, tank handles, all the plastics, recoil (one's missing and one needs a rope/handle) Also, isolators are damaged, air filters are missing and so forth. One crankcase is good, one has a small chip where an isolator mounts but I think it would be ok. Cranks seem to be ok on both. One needs a clutch cover and the other one is ok.

So, to shorten this saga, the one with the best crankcase has a lot of cylinder fin damage. Most of the fins on the exhaust side are broken off. I don't worry too much about a couple broken fins but this is a LOT. In my opinion, too much.

So to the original question, without testing to failure, how much "fin" can be missing and still expect the saw to be reliable? Keep in mind this isn't a homeowner saw that's going to cut a few branches twice a year.

I'm mostly interested in hearing from people that have run saws extensively with lots of fin missing and how it turned out.

 

[Mastermind]

I have a couple of MS460's that one of my chainsaw customers brought to me. He wants me to take both of them and make one good saw. He said he's ok with aftermarket parts.

Well, they were both run over by a skidsteer when nearly new. Problem is that most of the same parts are damaged. They both need top handles, tank handles, all the plastics, recoil (one's missing and one needs a rope/handle) Also, isolators are damaged, air filters are missing and so forth. One crankcase is good, one has a small chip where an isolator mounts but I think it would be ok. Cranks seem to be ok on both. One needs a clutch cover and the other one is ok.

So, to shorten this saga, the one with the best crankcase has a lot of cylinder fin damage. Most of the fins on the exhaust side are broken off. I don't worry too much about a couple broken fins but this is a LOT. In my opinion, too much.

So to the original question, without testing to failure, how much "fin" can be missing and still expect the saw to be reliable? Keep in mind this isn't a homeowner saw that's going to cut a few branches twice a year.

I'm mostly interested in hearing from people that have run saws extensively with lots of fin missing and how it turned out.

I would have him spring for a new OEM top end. Period. It's a working saw that will be ran hard.......it needs the cooling fins intact.

 

[Mastermind]

Notice I said new OEM......although, I'd be ok with a good used OEM jug.

 

[Homemade]

Pics?

If you think it’s questionable then don’t do it.

 

[Wilhelm]

I think You just need to break off the same amount of fins on the opposite side otherwise that cylinder might run out of round!
This should also solve the imbalance issue towards the rear handle.

.

.

.

Sorry, couldn't resist.

 

[Fish]

I think You just need to break off the same amount of fins on the opposite side otherwise that cylinder might run out of round!
This should also solve the imbalance issue towards the rear handle.

.

.

.

Sorry, couldn't resist.

???

 

[Fish]

Let me go smoke a joint and think about that a while....

 

[Lightning Performance]

Let me go smoke a joint and think about that a while....

Smoke two or three cause they don't last long.




Pressing Hyway jugs for daily services lacks. They need work just like the Meteors do to be up with oe power. For plug in and go to work daily, like the monkey said, oem.

 

[BuckthornBonnie]

I put together a 460 with fins missing (think I posted about it here or FHC). I would not have put that jug in the hands of a pro tree guy or logger...I did trust it to a buddy who will use it moderately.

 

[BuckthornBonnie]

Not as bad as I remember.

 

[jacob j.]

I've run a 372 in a commercial falling application with more than 10% of the cooling fins missing without any problems.

That saw was ran hard at high elevations in the heat, mainly falling big snags (24"+).

I would say more than 15% missing cooling fins would cause heat soak problems for most users.

 

[Mastermind]

I've run a 372 in a commercial falling application with more than 10% of the cooling fins missing without any problems.

That saw was ran hard at high elevations in the heat, mainly falling big snags (24"+).

I would say more than 15% missing cooling fins would cause heat soak problems for most users.

Your awesomeness is enough to keep that saw cool though.......

 

[Stump Shot]

I know loggers have run them broken for long periods of time without issue, that said, for a customer I personally won't put cylinders like that on their saw. Save it for a personal or a play saw or something like that, or just to have around for a better than nothing emergency repair.
I like to think it's all the minor details that keep a saw running good, but also the owner happy. What will he think after paying good money for a repair just to see stuff still broken?

 

[fearofpavement]

I inquired and found the saws are used for tree removals a few times a month, so not daily usage.

I think he wants the saws fixed cheap. OEM parts would put the price out of reach as it's going to take a lot of parts.

I have some pics now and will post those up in a bit.

 

[fearofpavement]

Here's the "good" cylinder. I'll show the damage to this cylinder and the crankcase first. This is saw number 2.




The above pic shows the broke off pieces on the better cylinder. I wouldn't have any reservation in utilizing this cylinder with these fins missing. However, the crankcase has some damage which is in the below pics.

 

[fearofpavement]

This crankcase damage is where one of the isolators goes that attaches the tank handle. I think it would be ok to use as is. That is a crack next to the chipped out piece.

 

[fearofpavement]

This is the "bad" cylinder showing extensive fin loss.

 

[fearofpavement]

 

[jacob j.]

I would say that the "good" cylinder is probably passable. Cylinder #2 is scrap for your guy. You could probably use it yourself.

 

[BuckthornBonnie]

Depending on funds, some of that (or all) could be welded.