|
Post by edju1958 on Feb 2, 2021 20:27:26 GMT -5
I was just thinking that it's possible your rings might be stuck.If this saw has been sitting for a number of yrs.it is possible.Also after sitting for a long period of time the cylinder will be dry which will lead to low compression.I think that's what Okie was trying to get at by adding oil to the cylinder.If the rings are really shot the adding of oil will only bring the compression reading up by 5 or 10 #.
|
|
pawild
Collector wannabe
Posts: 12
|
Post by pawild on Feb 2, 2021 22:04:44 GMT -5
I'll try it. I know this saw has not been run much or worked on in over 30yrs. I ordered new reeds for it and am in the process of totally tearing it down and redoing the whole thing.
I dont understand why an automotive pressure gauge would read low. What would make it do that?
|
|
|
Post by ronaldt on Feb 2, 2021 22:10:59 GMT -5
I'll try it. I know this saw has not been run much or worked on in over 30yrs. I ordered new reeds for it and am in the process of totally tearing it down and redoing the whole thing. I dont understand why an automotive pressure gauge would read low. What would make it do that? I've been down that road also. It's something to do with the Schrader valve not being in the part ( adapter) that screws into the plug hole.
|
|
|
Post by blythkd on Feb 2, 2021 22:14:57 GMT -5
It's the foot and a half of hose that takes up part of the saw's compression that causes the reading to be low. That's why I've always used a small gauge with a tapered rubber snout that you just hold against the spark plug hole. The gauge is only a couple inches away from the spark plug hole so it doesn't lose much pressure. I've had very good luck with this type of gauge.
Edit: Yeah, like Ronaldt said, if the Schraeder valve is right near the end of the hose that screws into the spark plug hole, that helps but seems like most of the automotive gauges I've seen have it right up at the bottom of the gauge. With my little stubby "hose-less" gauge, the Schraeder valve is actually poking into the spark plug hole.
|
|
|
Post by edju1958 on Feb 2, 2021 22:25:31 GMT -5
I was just rerreading the previous posts & see that you asked about a new piston.If there's nothing wrong with the old piston don't waste money on buying a new one when all you might need are the rings - part # 65003,& Leon has them for $10 for a set of 2.
|
|
okie
Saw Builder
Posts: 199
|
Post by okie on Feb 3, 2021 8:56:45 GMT -5
About the comp gauge. You should check your gauge on a know good comp saw.You can review on-line about WHY SOME COMPRESSION GAUGES WILL NOT INDICATE CORRECTLY WHEN CHECKING SMALL CC ENGINEs Their are more than one reason that a auto comp gauge will read low on a small cc engine but one of the main ones is they USUALLY require a special low pressure schrader valve AND it be located in the adapter that screws into the spark plug hole. Also on a EZ if you leave the comp release button OFF and pull the rope over slow you can feel when they have good compression. At 80 psi it will not pull through very hard. Not very important here since you are going to take the engine apart, but when I want to see if rings are stuck I remove the muffler and bring the rings into view and take something like a small blunt object and press on a ring to see if I can see it move in/out little bit. Main thing is just BE AWARE that your automotive compression gauge or any gauge can very easily lie to you and lead you in wrong direction when checking a small cc engine. This is the reason the I have two so as to compare one to the other when I see a low compression reading on a small cc engine AND usually anything lower than 125 on a EZ is not a good thing, but I've seen some chainsaws that start/run and cut good with 100 psi if all else is good. (sometimes inspecting through the muffler port is more important than a compression test, you can see that the piston/cylinder is eating itself) Also if the little low pressure schrader valve starts leaking back, not holding pressure on the gauge just remove it and clean the seal ring at the valve's pintle with a q tip. They will get a itty bitty piece of carbon grit in them every once in awhile and won't hold a constant pressure on the gauge. here is little bit of info about small cc engine compression gauges. www.arboristsite.com/community/threads/compression-tester-issues.310133/I got 3 of the Napa 700-9556 compression gauge Schrader valves today after the local NAPA ordered from their warehouse. The come 5 in a box and you can buy them each @ approx. $2.20 each. They worked A-ok. One was defective out of it's sealed package, was not spring loaded on back check due to a broken spring, noticed immediately before attempting install for test.. 3 /2018 Napa #700 9556 is obsolete. Here is a special low pressure schrader valve for compression gauges Milton and Lisle part number's and I seen them on flea bay as still available. Milton 1251-2 @ about $5 each Lisle 20100 @ about $7 Update info 12/20 Possible good compression gauge for chainsaws at $40, STANDIX 1023 Mentioned at this link 12/20 www.arboristsite.com/community/threads/got-a-new-compression-gauge-and-tested-a-few-saws.348043/
|
|
pawild
Collector wannabe
Posts: 12
|
Post by pawild on Feb 14, 2021 18:12:43 GMT -5
Nice this is great info. I did inspect the piston and rings through the exhaust port, rings aren't seized.
I pulled the carb and inspected the reeds going to flip them. At this point I'm waiting on a tool to pull the clutch. I'm going to inspect and replace crank seals.
At this stage of the game is a full restoration. Once the fly wheel and clutch is pulled I can send the tank, stripped handle/air box and covers to be sandblasted.
While that's happening I'll clean up the cases and replace whatever else I find. This saw is really trashed in terms of old rotten saw dust in everything.
|
|
|
Post by edju1958 on Feb 14, 2021 19:01:42 GMT -5
It's amazing how & where that old sawdust gets in these old saws,& the sad thing is no one even so much as pops off a recoil to clean it.Then 20 or 30 yrs.later they wonder why their saw is burnt up.
|
|
okie
Saw Builder
Posts: 199
|
Post by okie on Feb 14, 2021 19:37:06 GMT -5
It's amazing how & where that old sawdust gets in these old saws,& the sad thing is no one even so much as pops off a recoil to clean it.Then 20 or 30 yrs.later they wonder why their saw is burnt up. why their engine is sick.I've seen the same thing only worse on high dollar lawn tractors due to not being regularly cleaned by the owners or operators. When I see a piece of eq that is treated like so I know that me repairing it for them is kinda like peeing into the wind. They could take a small $100 portable air compressor or use a leaf blower and clean under the hood, cooling fins, top of deck, etc, on their lawn tractor mower using a $100 piece of equipment just a couple of minutes to clean and extend the useable life of a expensive piece of equipment by several years, clean it about every 2nd or 3rd mowing use or more often, but it just don't happen. A expensive engine ruined because it was just neglected and overheated.
|
|
|
Post by juanmotyme on Feb 16, 2021 8:13:10 GMT -5
Who can I send my Super XL for work? I worked for RRNF in early 70’s. Got to buy my say when they “upgraded”. No shop around her will touch her. I live in BONNEY LAKE Wa. Near Tacoma.
JUANMOTYME
|
|
okie
Saw Builder
Posts: 199
|
Post by okie on Feb 16, 2021 9:25:26 GMT -5
Who can I send my Super XL for work? I worked for RRNF in early 70’s. Got to buy my say when they “upgraded”. No shop around her will touch her. I live in BONNEY LAKE Wa. Near Tacoma. JUANMOTYME So as to get faster replies about your XL12. You might try going to the Home page and posting your question in the XL12 section. You might try this direct link. I'm new here also and just happened to be subbed to this EZ post. houseofhomelite.proboards.com/board/41/super-xl-12-family
|
|
pawild
Collector wannabe
Posts: 12
|
Post by pawild on Mar 14, 2021 16:18:41 GMT -5
Update on this resto...I haven't been able to work on this saw much lately but getting more time now.
I keep running into little snags...had to build a puller for the fly wheel removal, now I can get to the 3 screws that hold the gas tank on. Only one of those screws came out, the other 2 won't budge, and unfortunately they have Philips head screws that are already mangled a bit. I can't believe these are factory screws because they are Philips head but who knows.
Anyway, all of the painted body parts are completely removed and ready for restoration once I get the tank off I'll post an update.
If there are any tips to getting these loose let me know.
|
|
|
Post by xl130 on Mar 14, 2021 16:32:12 GMT -5
There is a good chance they are pozi screws. They look very similar at first glance to a philips head. Maybe post a picture of the screw head to confirm.
I use a heat gun on stubborn screws like that and an impact type driver can also be helpful.
If you stripped out the heads then the only way to get them out now is heat and a reverse extract bit. Not much fun but I’ve been there!
Of course be careful with heat around a gas tank......
|
|
|
Post by 5terrysupersaws on Mar 14, 2021 17:05:32 GMT -5
|
|
pawild
Collector wannabe
Posts: 12
|
Post by pawild on Mar 25, 2021 19:38:44 GMT -5
Got the screws out... what a PIA...LOL
saw is completely disassembled and off for sonic cleaning and sand blasting.
Once I get it back I'm going to change the rings, crank seals get it ready for paint.
I'll probably do a YouTube video for the finish... stay tuned.
|
|
|
Post by blythkd on Mar 26, 2021 6:51:58 GMT -5
Did you find any Torx head screws to hold the tank on? It's always been my policy to throw those Phillips head screws in the trash once I got them out.
And btw, thanks to everyone that enlightened us with the posidrive discussion. I've taken out tons of these screws with a #2 Phillips bit in an impact driver. Now I know about posidrive. I've seen the marks on many screw heads but never realized they actually meant something. I've seen the ridges on "Phillips" bits but never realized it was actually a posidrive, not a Phillips. I love it when I learn something new.
|
|