Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Stihl => Topic started by: ba_50 on June 10, 2014, 03:49:14 pm

Title: My Stihl av28 WB side panel won't come off
Post by: ba_50 on June 10, 2014, 03:49:14 pm
I want to check the right crank seal for leakage and the side plate won't come off with the screws out. What to do? Thanks.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: jmester on June 10, 2014, 04:50:22 pm
You need to take the snap ring off the clutch drum.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: brokenbudget on June 10, 2014, 05:19:31 pm
correct.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 10, 2014, 05:24:36 pm
Why do you want to test for the seal leak there?????
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 10, 2014, 05:26:07 pm
Who put that farking smiley on my last post?????????

You know that I hate smileys!!!!!!!!!!!!
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 10, 2014, 05:26:39 pm
AAAAAAAAuuughhh!
Title: Re: My Stihl av28 WB side panel won't come off
Post by: 3000 FPS on June 10, 2014, 11:15:18 pm
Who put that farking smiley on my last post?????????

You know that I hate smileys!!!!!!!!!!!!

If it is important I can remove them if you like.    Got keep the peace.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: jmester on June 10, 2014, 11:29:14 pm
I think it is a frown face not a smiley.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: 660magnum on June 10, 2014, 11:32:32 pm
Fish . . . You put the frown face's there yourself with all those question marks you added at the end of the sentence.

We as moderators can remove the question marks but you can probably do it yourself if you do not wait too long.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: 3000 FPS on June 11, 2014, 12:43:26 am
I think it is a frown face not a smiley.

Yea it does look more like a frown.   Oh well, just keep on smiling everyone.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 11, 2014, 10:43:27 am
Yes, I always use multiple punctuation points for drama...........

Little did I know that it would turn me into a smiley user...........................

I have enough bad habits already...

Nah, it is all good, I just will deal with my occasional illegitimate offspring as they show up on my doorstep.  And be more careful
where I put my question marks........
Title: Re: My Stihl av28 WB side panel won't come off
Post by: ba_50 on June 11, 2014, 12:24:28 pm
Why do I want to check the right side? Because that's what a utube video said to do. I assume it is all right since the left one looks ok but you never know. I'd rather do that then take the cylinder head off and ruin the gasket and find out that wasn't the problem. I will take the snap ring off. It won't idle or looses power when cutting. It runs erratically. Thanks.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 11, 2014, 06:33:36 pm
Wow...

You don't really test seals by looking at them, well yeah a real blown one would be pretty obvious...

Your problems are likely elsewhere, and you tube doesn't make the advice good.......

But to be fair to everyone involved, you might start from the beginning, before you started listening to "youtube"....
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 11, 2014, 06:35:44 pm
Seriously, I am not trying to joke, but we can help you fix this, if you will let us.....
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Nathaniel Vansickle on June 11, 2014, 10:25:54 pm
YouTube is great to look stuff up on. .. if you already know the basics of what your trying to do.  Looking at a seal doesn't usually get you anywhere.  Start from the beginning and explain your problem and what you have checked/tested. 
Title: Re: My Stihl av28 WB side panel won't come off
Post by: brokenbudget on June 12, 2014, 07:58:55 am
you're not going to see this unless you pull the seal:
(http://i59.tinypic.com/1088xm1.jpg)
you do need to pull that cover in order to see any leakage while doing a pressure/vac test.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: KilliansRedLeo on June 12, 2014, 09:18:52 am
BB, nice neat screw hole you drilled to pull the seal! I have seen just recently where a guy didn't do such a good job and plowed a nice channel in the case lip when pulling the seal! :'(
Title: Re: My Stihl av28 WB side panel won't come off
Post by: brokenbudget on June 12, 2014, 01:33:51 pm
I don't drill the hole. I let the drywall screw open it's own hole ;)
Title: Re: My Stihl av28 WB side panel won't come off
Post by: ba_50 on June 12, 2014, 03:33:58 pm
I'm always open to suggestions. A mechanic and I came to the same conclusion that it isn't a carb problem. He thought it was an air leak and to check the cylinder head gasket if I didn't get it sold. Like I said before, it won't idle or get full power when cutting. Several people online said the same thing only most leaned towards the seals.  Bob
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 12, 2014, 03:42:28 pm
If it is a WB you should really look at them points.........
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 12, 2014, 03:45:21 pm
Slap on an old 029 coil and go cut wood.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: ba_50 on June 12, 2014, 04:28:18 pm
This one doesn't have points
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 12, 2014, 04:58:31 pm
Did it come that way?  Just curious.  All of the 028 WBs that I have seen came out with points, but does the cover include the AV as well?  So you have already been into the flywheel side which is why you re looking to the pto side now?

Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 12, 2014, 05:09:50 pm
I mean, there are so many variables and steps that you are skipping, you have  30 plus year old saw....

The one thing that happens to all of these saws is that the foam insert starts degrading and breaking up and invades the carb body, and collects a lot in the inlet screen, like a cute wad of snuff, and most folks pluck out that screen/snuff and throw it away,
and on the other side, replace everything that is left in the kit, and call it a complete carb overhaul.

Also, the fuel line might look fine, but if you go to try and remove the fuel filter, the fuel line pinches/oozes together and sticks
because that old fuel line has turned to goo.
The old impulse line might look fine, bit over 30 years it is hard and brittle, and doesn't seal like it did 30 some odd years ago...

But if you were chasing an air leak, doing it correctly is not too hard....
Title: Re: My Stihl av28 WB side panel won't come off
Post by: ba_50 on June 13, 2014, 05:56:08 pm
It is a 28AV (wood Boss) sorry about the confusion. It has a new carb kit and fuel line. I don't know about the impulse line. Mainly going by what a mechanic said after he went through the carb.  Bob
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 13, 2014, 08:53:36 pm
Sorry to be abraisive, but you seem to rely a lot of the opinion of the guy that "didn't" fix your saw..  And has shown you the yellow brick road.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 13, 2014, 08:55:55 pm
And sad to say that most "mechanics" do not rebuild a carb properly.  Ask him about the filter insert, you will get a confused look.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 13, 2014, 08:57:50 pm
Can you pull some covers and take some pics???

Really, some of these guys have actually helped folks, we just need to see for ourselves.....
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Nathaniel Vansickle on June 14, 2014, 02:38:18 pm
pics of piston through the exhaust port would help get started.
here are first three steps in diagnosing a chainsaw.
1. check spark
2. check compression
3. pull muffler and look at P&C
lets start with a yes or no for #1
hopefully a 130 or higher number for #2
and no scoring for #3

with proper tools those 3 things can be checked in less than 5 minutes on most saws and give a good indication of where to go next
Title: Re: My Stihl av28 WB side panel won't come off
Post by: ba_50 on June 21, 2014, 03:02:54 pm
I guess I'll start from the beginning.

First of all the mechanic decided not to check it all over as he didn't know how much I wanted to spend and there was a parts availability question.

The fuel tank filter screen has  little grit  in it but wasn't plugged. It has a foam filter.
The compression on first pull was 90 and topped out at 135#
Yes, it runs, that why I said it wouldn't idle or develop power when cutting.
The right crank seal was clean so I'll assume it is good for know.
Does the flyweight nut come off clockwise or CC to check crank seal oil pump side seal?
The piston has some scoring but not bad. I've seen lots worse.
This forum won't take my picture size. I tried to do it a few times but no luck. Anyhow it runs.
I don't know how to do a vacuum test.

Title: Re: My Stihl av28 WB side panel won't come off
Post by: 660magnum on June 21, 2014, 05:49:17 pm
The flywheel nut is right hand
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 21, 2014, 05:58:55 pm
Since you found crud in the carb screen, I would suggest you go back into the carb, pull the covers and diaphrams, remove the needle,
spring, lever and hold up to a light, and see how clear that passage is underneath, then blow it out, as well as the rest of the carb, and hold it up to a light again, and visually verify that the passage is now clear.  Replace the fuel filter, and closely inspect the fuel line for softness/gummy, and also cracks etc.  Look at where they grab onto the filter and carb, and decide if they would pass the Walrus test.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: ba_50 on June 23, 2014, 02:12:43 pm
I guess I will soak the carb in carb cleaner too. It is already off. Much easier fix than seals & gaskets.
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 23, 2014, 05:05:02 pm
Just pull the needle and look through that passage....
Title: Re: My Stihl av28 WB side panel won't come off
Post by: ba_50 on June 24, 2014, 04:12:23 pm
The float needle screen fell out and got lost. I have a new one but it won't seat correctly around the ridge. I also have a couple of Walbro carbs with screens but they won't come out and might fit better. Any suggestions?
Title: Re: My Stihl av28 WB side panel won't come off
Post by: Fish on June 25, 2014, 08:39:11 am
Look through the passage, make sure it is clear.  Talk to any chainsaw mechanic, he will have a drawer full of carb kit leftovers and should have dozens of screens.