HOW-TO Pressure & Vacuum Test On A Chainsaw - Leak Down Test
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- เผยแพร่เมื่อ 14 ม.ค. 2016
- HOW-TO Pressure & Vacuum Test On A Chainsaw - Leak Down Test
Can't find what's causing your chainsaw to not run properly? You may need to do a leak down test.
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#donyboy73 #db73 #stihlchainsaws - แนวปฏิบัติและการใช้ชีวิต
I like how you get right to the point and don't dribble on about things that don't matter. You're the best small engine mechanic on TH-cam.
I know Im asking the wrong place but does anybody know a tool to log back into an Instagram account..?
I was stupid lost the account password. I would love any tricks you can give me!
@Byron Kelvin I really appreciate your reply. I got to the site through google and I'm trying it out atm.
Looks like it's gonna take quite some time so I will reply here later with my results.
@Byron Kelvin It did the trick and I now got access to my account again. Im so happy:D
Thank you so much you saved my account :D
@Reed Jose Happy to help xD
DONY, I KNOW WERE ALL HUMAN AND HAVE OPINIONS, I DO NOT UNDERSTAND WHY ANYONE WOULD LEAVE A DIS LIKE (THUMBS DOWN)EVERYTHING IVE WATCHED FROM YOU ALL YOUR KNOWLEDGE IS WONDERFUL FOR US DO IT YOUR SELF FIX IT GUYS.BLESSINGS TO YOU AND ALL READING THISSTEVE IN BEAUMONT CALLY
+Steve Hoover jealousy causes people to do that, also other insecure shop owners who don't want people to fix their own stuff
donyboy73 Or A guy that sells new chainsaws!!
Big Guy; I was thinking the same thing. If the thumbs down is clicked, a piece of constructive criticism should be left out of courtesy, and for the sake of improving skills and knowledge.
Thanks to this video, I did a rudimentary press/vac test with a big veterinary syringe on my 1978 Stihl 031 and was able to rule out the crank seals. ended up being a deteriorated impulse line. Saved me tons of time and money. Thanks, Don!
A REAL PRO. It's great to see you performing as you do. Thanks for all those vids and keep up the good work.
the old wizard 998 thanks im new to this small engine thing last year i got a whipper snipper fixed and running thanks to don
A very clear & concise troubleshooting video that can solve a saws inability to run! Best Small Engine Repair You Tube Channel!
+Sean Signer thanks Sean!
Dony, your videos are extremely helpful! I enjoy the detail and attention you give. I have learned a lot from you! Keep putting out videos !
I'd like to see you do a leak down test on a snow blower/lawn mower! : )
Thanks Dony, first class as usual. What were the symptoms with this saw??
great video! thanks. 6:10 in i think that vacuum may be in inches
Pressure I was told almost always is the head gasket when its set up like you had it. Didn't know that. Thanks as always. Your videos are the best and well worth subscribing.
Your so professional donyboy73
Great video Don! Thanks for the thorough detail on how to trouble shoot with the use of the pressure and vacuum tests.
+James David thanks for watching david
Excellent presentation. Timely because I just bought a Mityvac to test my saws that I work on.
Great content thanks
It was impossible to find anything similar to what Donny uses for the pressure test. What I did was take a large bottle cork (from hardware store) so it fit snug in the bellow with approximately 1/2" of the cork exposed . I then drilled a hole in the cork after the fit check and placed a piece of fuel line through the cork leaving enough exposed to allow for the vacuum pump to be attached. I also covered the top and area around the fuel line with black permatex RTV for a good seal. The bottom was also done in the same fashion. I then used a small hose clamp to keep it secure when installed into the bellow.
Not too fancy, but if you can't find the adapter Donny uses, I think this should work.
I like this very good instruction and cool you go that deep as here on the machine repair. Thak you allot ! Keep up the good work. Very helpful for us that has a passion about making small engines run as they are intended to do. I just like to restore them...just for fun.
Thank you very much Donny , I believe you are the best instructor on small engines . I firmly believe you will be a great teacher in a technical training school in the future . Once again you have solved my chain saw problems and now running like clockwork . Kind regards Ted , west Australia
Hi I have a question can this be done through to spark plug hole. Thanks Glenn
Don I just vac-press tested a stihl ms390. It's got great pressure test results. HOWEVER it won't pass the vacuum test.
What could cause this result.???
Please make the video of MS 382 chain saw trouble shooting
thanks for doing this video. very clear and helpful. all the best :)
Thank You Dony like all your videos
+Gil Velazquez thanks Gil!
I have used this way of pressure/vac testing for a few years now and it does indeed work very well. like he said tho just make sure your connections to the pump are solid! Also works great for carburetor work
I think I'll have test my 3 STIHL 010 AV because they all have same symptoms.
Thank you
Nice tip Donny . Since I already have an automotive smoke machine I have found it works great as well in testing for all sorts of leaks on small engines too.
+Steve Rob that would be nice to have!
+donyboy73 you can make one with common materials such as a paint can, a tiki torch wick and some nichrome wire. Google it and or look on eBay for completed ones and kits to make your own. Not expensive at all, work just as good!
Man I am glad I read this comment! I hadnt thought of doing that to test for leaks but I will now. I actually have an 038 Mag II that wont idle after a port, polish, and refresh. I suspect the cylinder to crankcase seal is the issue but that will be a great way to confirm.
I hook my compression tester on 2 different chainsaws 1 working and the other one doesn't both have the same reading 30psi. Any thoughts 💭.
Thanks for sharing!
hi there iv beening working on a husky 266 i can not get it to start iv replaced fuel line and filter and it has spark was running a year ago what should i do? wont fire at all even with a little fuel put in carb
Sir what happens if chainsaw leaks it bogs down under load....thanks this is most important issue in chanies saws..
Last comment, so true. Your explanations and step by step are spot on! Bravo
Crank seals are very important in a 2 stroke
Another Great video as always. Thanks again Dony for sharing with us.
+mcmaster22 you're welcome, have a good weekend
Great vid Don , Thanks !!
I am a stihl tech I have the same vac tester I made a tool to keep the case at 8 psi ot can be a pain to keep pumping the tester
Good video Don. I got a couple 028s that I replaced crank seals on, but still got a leak somewhere. I'll try the pressure test on them.
excellent video. Removing the seal employs a knowledgeable mechanics trick... you may consider adding that to your next version of this clop. Great editing. Thanks Dony for another good video
+James Mullins thanks, yes I will make a seal removal video
good one, dony...
Excellent video, I didn't know any of this. Thank you very much :)
hey Colin. how's life?! hope u are well.
My small engine has a problem I start it and then after like a couple seconds it dies can u make a video on how to fix it
Thanks agin great video.
gracias
thorough advice
Sweet drill out and pick grip and rip on that seal !!!! That's a sweet time saver, Sir! Thanks again
Very informative!!
thanks Don! nice job
+Warren Scott thanks
I'm interested in that adapter, or an idea for a home made adapter, to connect the pump to the bellows.
One of the best channels I’ve seen. Thank you!😊
What's the part number for the Stihl adapter with hose connector that you plugged the bellows with? Thanks
How do you take out the seal.
where can i find crank seals for a 28 boss
Great video. I wonder if this would work on a two stroke outboard. I'm guessing it would.
Thanks man for making this video very helpful 👍🏽
Dude! Fantastic informative video! Thank you
tHANKS Dony. One more inlightful vid. Great work. Have a nice day.
+ice25781 thanks
I did with an air compressor with a Stihl hedge trimmer I rebuilt, one crank seal leaked but I went to the bearing shop & bought 2 of the same sized seals for $15 AUD.
The machine had other problems as well but it had no more leaks after that.
Don
I was wandering after you run this test,if you can do a upper cyl leak down test with piston up to see if rings are bad, like on a 4 stroke.... thanks again great job
Plus you have to be careful when you put the pump down it doesn't relice the presher the lever is on the bottom I think bad ida of the miti
That is nice to know and I didn't know about that going wrong on the saws.
Nice job . I think got try that. It might be adjustment on carb Mine will start with spray spray starting fluid . Thanks showing that.
AWSOME informative video !
Well presented Donny Thanks for sharing Cheers from NZ
Glad you enjoyed it
Thanks for this well explained very informative video.
Can I use that attacher with the carb on and test the carb at the same time as long as I keep the pressure lower. Thanks for you videos which so far are the best ive seen quality.
Is that just one of those brake fluid pumps???
you need the stihl seal tool for the flywheel side. to easy to damage the crank,etc... just saying.
Very nice video
+Gene Ballay thanks
I like your style. Usually I get bored watching videos because there is too much fluff. Your videos are excellent.
Hi, great video. I have a MS361 and the same adaptor you used for the leak down test. What did you fabricate to use it with the handle/gas tank assy removed? It makes the procedure a lot simpler! Thanks
I just love your videos!
Amazing video, thank you Dony! Your videos are sooo helpful! I have a Stihl BG55 blower that I want to leak down test. Do you know how I could do that without a bellows? Is there some kind of adapter I can use to add pressure or vacuum through the spark plug hole. Thank you!!!!
I have an 038 magnum Ii. I did the same but blocked from behind the carb covering the impulse line. Holds 6psi for over 5 min at bdc, both vac and press, but compression test from the spark plug leaks out, wont hold compression when cranking. what am I doing wrong? Great vids thanks!
No scoring on the cylinder, and it does run. Im thinking its piston rings.. meh!
@@MrSparkums did you ever figure out what was causing low compression, I have no scoring and changed rings and still low compression, thanks todd
@@toddc4d MI
It wound up being the rings.. I would invest in a mighty vac, and make some block off plates. No way to eliminate Gasket or seal leaks without a p/v test.. I wound up selling it for a pretty penny.. Instant regret...
Good video
+wtbm123 thanks
Thanks for making this video did you make your own parts to to the pressure test?
did you replace the seal with out splitting the case ?
+travis chandler yes I just popped it out from the surface
Great video thanks for sharing 🙂👍
If I had an air leak like that one would it run my saw too lean to make it overheat? I’ve gone through 2 top ends now on my Stihl ms 440 and I don’t know why!!!!!! I haven’t checked the crankshaft seals yet
yes it would, on the 440 check the intake boot, it might be cracked
This pump can be used in carburetors?
Yes
Hey Donny I don't know how to ask you a question but I'll ask here trying to get a respond. I just started my generator last snow storm and it was very loud and sparks were coming out of the exhaust. It's about a 10 year old generator maybe older. Need some advice
+abigail gabriel I recently watched one of Donny's videos that showed the same thing on an engine. The exhaust valve was stuck, or out of adjustment. Look for this video and I think it will help.
Why do the oil seals go bad? Could it be linked to overheating, lean running or dirt ingestion?
wear and tear and if a bearing is worn it also causes the seal to wear as well thus causing an air leak
it is sad that we live in such a disposable world where 100 an hour labor from a shop, high dollar parts from sthil push it quickly to the need to trash it which makes this information that much more valuable.forced to by import parts, bought a saw ran ok but is basically junk after seeing the scored piston , but I'm really enjoying going through these videos just realized the seals were bad ,lots of oil in the clutch was just going to do the piston now I know the cause thanks great channel
Solid video thanks
I just referred a sub to you regarding crank seals. (to watch this video).
thanks bruce
good video. Don been waiting for that one for a long time how did you remove the seals that would be my only question thanks a lot
+gene hensley I used a sharp pic and hammer
@donyboy73 I have a Husqavarna 353 that is leaking gas at the bottom tank seam. Can this cause the saw to run ragged and can it be repaired?
Just need to replace the seal
yes
Jason Johnston very good
looking for parts for husqvarna 240 2012-2013 chainsaw. parts needed complete clutch, hub etc. saw is not 'grabbing' under load. Are you willing to get these parts (OEM) and ship. thnx
+Michael Dobbin hi, i'm not a Husqvarna dealer, check locally for a dealer
+donyboy73 I don't have a local dealer. Ok Thnx.
Should the piston be at bottom or top dead center
It doesn't matter the position of the piston.
If a person install oil seal incorrectly on PTO side of MS660, say spring fell off inside seal, will vacuum test spot that seal? Thanks
yes it will
@@donyboy73
Thanks a million.
What I meant was that seal looks fine from outside appearance but spring fell off inside seal.
Another great video! Can you show us how to replace the crankshaft and/or flywheel seals on a chainsaw in the near future?
Sorry meant clutch not crankshaft
Just did a pressure test on my 029, started at about 8 hg on the vacuum and pressure and it held it for about 2 or three minutes before dropping down to about 5. Don't know if it's acceptable or not but might also be my homemade equipment..
So might this seal cause the saw to leak oil from the bottom. Or would there be a seal for the chain oiler?? Thanks awesome helpful vids i cant afford to keep throwing away tools!
During a test, I always seem to get a little air escaping from the spark plug hole even though I tighten the plug down snug. I just don't think that the metal washer on a plug creates an air tight seal. Have you experienced this, Don?
Grease.
hey would that tester work on carbs as well? thanks really appreciate your videos
Great video; would like to see how you replaced seal without disassembling engine.
Lewis,did you see the hole he drilled in the old seal?
Could you show how to replacing the seal?
How to Replace a Seal. Using a set of calipers, measure the deepth of the old seal. Carefully drill a small hole in the side of the seal centered between the ID and OD. Install a self tapping screw into this hole. Be very careful not to drill or install the screw to deep or you will damage the crankshaft bearing. Using either a slide hammer or channel locks, grab the head of the screw and pull the seal out. Be very careful not to damage the running surface of the crankshaft or the seal bore. Clean everything up and install the new seal with the appropriate seal driver or a deep socket. Make sure to install the new seal to the same deepth as the old one. A little oil on the crankshaft surface and a light smear of silicon in the seal bore. Make sure to preform a second pressure/vacuum test. It's a good idea to give the crankshaft a turn when pressure testing older seals.
Dony: I'm waiting on my order of a MityVac vac/pressure gauge to test my saws. I'm wondering if this would make things easier? I propose using a rubber stopper in the intake boot. It might have to be held in place under pressure, but may work very well under vacuum. Then perform test through the impulse line. What do you think?
Does the piston have to be at TDC seems like there is a chance the piston could block the air intake and access to the bottom end of the crankcase
Hi
I watch all your videos on small engines, would it be possible to let me know how to do a pressure and vacuum test on a Stihl BR600 Leaf Blower.
As I can’t find any videos on this.
Thanks and regards
Neil Taylor.
Good info Don. where did you get your Mighty Vac leak vacum leak tester?
+Raymond Campbell got the pump from an auto parts store, you can get it on amazon
you forgot to mention the piston should be at bottom dead center