Tucker943
Bamboo Plantation Owner
I'm going to drop it off at the saw shop. But in the mean time, let's have your first guess. Starts fine, idles fine, runs well. Once its up to temp after a few cuts, it idles high. Crank seals?
372 high idle when warm
- Thread starter Tucker943
- Start date
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HolmenTree
Banned
or a partially restricted fuel tank vent.
Magnus
TreeHouser
Change in rpm is not good and can result in expensive surgery is you run it longer than tests.
Broken fuel line, ugly pick up/fuel filter, bad membrane/gaskets is a couple more things to look at.
Broken fuel line, ugly pick up/fuel filter, bad membrane/gaskets is a couple more things to look at.
Tucker943
Bamboo Plantation Owner
- Thread Starter Thread Starter
- #4
She is at the dealer. I just don't have the time to fool with it. I have a few other saws on the bench that are due for a part or two. Adding another isn't going to help matters. It worried me that it only gets the high idle when warm, like after metal has expanded.
O
oscar4883
Guest
I would pressure test it when warm. I am not normally on the "crank seal" band wagon but you may be correct. Where in PA are you?
Al Smith
Mac Daddy
Sounds typical of a crank seal .On the other hand I had a torn boot on one of the 038 Stihls that only showed itself after the saw was warm .My goodness but how that thing ran though ,scrarey RPMS and never lost R's in the cut .It took some investigation to find that one .
squisher
THE CALM ONE!!!!
Any diagnosis?
woodworkingboy
TreeHouser
Seems like a possibility, but why the problem only when warm? Seems like harder starting would also be a result. I don't doubt that they exist, but I have worked on lots of saws, and still have yet to find a blocked fuel filter.
top_notch
Treehouser
I replaced two fuel filters on our saws at work and they had been on there for at least two years (we only work in the summer here) and they didn't seem that dirty and the saws didn't run much better when they were new. I took the filters apart and there seems to be ceramic tube in there that filters the fuel. It had some dirt specs but it definitely didn't look to clogged. So then I tried to suck air through it and got a nice mouth of fuel...Just kidding. They seem along the same lines as chain sprockets...Never replaced one on a saw and have run many chains on it. Not sure when to replace those things....maybe when they decentigrate???
Al Smith
Mac Daddy
Well if you run a rim long enough it comes apart it will destroy about 6-10 drivers on the chain .They're only about 5 bucks to replace .
SkwerI
Treehouser
I highly doubt the saw is fixed. Sounds like the shop spent about 3 minutes on 'diagnostics' and threw a part at it just so they could say they did something. Another example of why I don't pay people to work on my saws.
Al Smith
Mac Daddy
I've said many times before a person is better off to learn to do your own repairs .
Burnham
Woods walker
Here's my elder's wisdom...that saw is broke, and if you fix it, it'll not be broke any more. Get to work!
Burnham
Woods walker
Not with that broke saw, you ain't!
MasterBlaster
Administrator Emeritus
+10!
squisher
THE CALM ONE!!!!
I've had issues like you describe from clogged fuel filters before. They might be right. Fuel filters clog with water not debris, so even though they may look fine they can be clogged. Worked the westcoast of Vancouver Island for seven years water gets everywhere. Transfer fuel from a drum or holding tank to a fiver to a combi and then to your saw, you're getting some water somewhere along the way when it's pouring 24/7.
Cut4fun
Redneck Chainsaw Repair
- Joined
- Nov 27, 2007
- Messages
- 2,635
Magnus
TreeHouser
K Keep.
I It.
S Simple.
S Stupid.
Us simple minded forget the simple stuff sometimes...
I would not be surprised this did the trick, but if so it had more to do with fuel supply than run time or temps.
Spraying will not do the trick if it is a temp related issue. Tilting from side to side mostly work.
Make sure it is set correct and lines are correct now after filter change.
Often when the 372 act up when hot it is air leaks in base or crankcase.
Then it run as it should cold, but get funny as it is hot.
I It.
S Simple.
S Stupid.
Us simple minded forget the simple stuff sometimes...
I would not be surprised this did the trick, but if so it had more to do with fuel supply than run time or temps.
Spraying will not do the trick if it is a temp related issue. Tilting from side to side mostly work.
Make sure it is set correct and lines are correct now after filter change.
Often when the 372 act up when hot it is air leaks in base or crankcase.
Then it run as it should cold, but get funny as it is hot.
