Service & Maintenance Question
Husqvarna T435 - having two problems right now:
1. chain...escalated
Service & Maintenance Question posted January 29, 2014 by reuven spero
6166 Views, 25 Comments
Question:
Husqvarna T435 - having two problems right now:
1. chain keeps loosening, like, really fast. I checked the parts manual - everything is there. cranking down hard on the nut - yes. chain is not new, but sharp. bar just seems to be moving in. how can i fix this?
2. getting lots of blue smoke after operating for a few minutes, like there is oil leaking onto something hot inside. I don't think this is oil leakage in the pistons, b/c power seems to be ok. on the other hand, i think the smoke may be coming out of the muffler hole. how do i diagnose this?
1. chain keeps loosening, like, really fast. I checked the parts manual - everything is there. cranking down hard on the nut - yes. chain is not new, but sharp. bar just seems to be moving in. how can i fix this?
2. getting lots of blue smoke after operating for a few minutes, like there is oil leaking onto something hot inside. I don't think this is oil leakage in the pistons, b/c power seems to be ok. on the other hand, i think the smoke may be coming out of the muffler hole. how do i diagnose this?
Answer
Hi Karla!
Ok, got the tach, Opened up the saw to wrap the wire around the spark plug wire - everything is TINY in there and could not tell one thiing from the other, but ok, got it working. Got H to about 12,000 and L to below 3000, and went out to give it a test. about 10 minutes in, did start to smoke blue again from the exhaust port, but really much less than before. Be nice to get rid of the smoke entirely, but I can live with this and call it fixed, unless you have another idea up your sleeve. Thanks so much. The new clutch drum should be here anyday, and I'll be back up to where I want to be.
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Reuven,
Thanks for the Update, and I agree we should be able to get rid of the smoke entirely.
So, give me a day to re-think and re-read your previous posts, and see if we have "exhausted" everything, No Pun intended, Lol.
I will definitely try to help you figure out why it could be still smoking.
PS. I also have a friend that has a service shop, I will also pick his brain tomorrow.
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OK, I re-read the posts, and I'm definitely thinking about the smoking problem.
I think the next test that I would try is to air test the engine cylinder and seals for an air leak. To do this you will have to block the exhaust port with a solid piece of rubber or gasket material, then re-install the muffler to hold the gasket in place. Next block the carburetor intake manifold by removing the carburetor, and installing gasket material between the carburetor and engine intake boot. Removing the spark plug and putting an air fitting into the spark plug hole (Husqvarna makes a fitting" part # 503 84 40-03 for this) or you may be able to modify an old spark plug to make an air fitting from it, but it has to seal the cylinder, with intake blocked and the exhaust blocked, you now need a very low pressure air pump ( a bicycle pump would work) and connect it to the spark plug air fitting. Pump the engine up with the air pump to ( . 8 bar or 80 kPa) the pressure should not drop significantly and hold the pressure for a minute. If you have an air leak it may be a very slight leak around the crankshaft seals or the engine cylinder gasket, or the intake boot gasket. A misting spray bottle with soap and water sprayed around these area's may show air bubbles.
Anyhow, That is what I'm thinking next, since the carburetor appears to be working properly it is possible for the engine to run with an air leak, but since all of the air is Not going through the carburetors venturie then the carburetor is not really working the way its suppose to by taking all of the fuel and air and mixing the air, so in essence the carburetor is pulling in some air and mixing with the fuel, and probably too rich, and the additional leaking air is being pulled in through an air leak to make the engine run. The rich fuel or Not complete combustion is what is causing the smoke.
But since this is a little bit of work to set this test up, please wait till tomorrow and I will check with my friends service shop to see what he suggests .
PS. One other thought and an easy check, Is start the saw up, and while its running position the saw in different positions, like to the left or right side, vertically up or down, and does the saw run correctly in all positions ? If Not it could still be a carburetor problem also.
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Reuven,
Just to get back to you, I did check with my friends repair shop, and the good news is my friends' shop said he does Not believe its an Air leak or a ring problem, and he felt it was definitely a carburetor problem causing the smoke.
So, I re-read the posts but don't remember if you took the carburetor completely apart, and thoroughly cleaned it, and also replaced the gaskets and diaphrams. A diaphragm and gasket kit is usually around $5.00 - $10.00 US, and then a can of spray carb. cleaner, and you can completely rebuild the carburetor, removing all the screws, and adjustment needles, and then thoroughly cleaning the inside, and putting it back together. Then when your all done re-adjusting the needles.
Its really Not too difficult, once you have done it once, I can usually do one in about 5-10 minutes, but if the engine is running good you may just want to leave it alone too!
Anyhow, I hope this helps and let me know if you need any additional help.
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Lent out my 435t and now it won't start! pulling the cord and the engine doesn't catch at all. pulled out the plug -it looks ok. think i'm smelling gas. what are my next steps?
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Reuven,
1. Reinstall the spark plug, and make sure everything is back in normal running condition, Set the controls for a startup using your owners manual. Now hold the trigger all the way down, which will cause your carburetor to be set for wide open throttle, and give your starter cord a couple good pulls, It should start.
Remember with wide open throttle this will clear most of the fuel and add alot of air, or maximum. Engine should go to full throttle, so be careful, and when it does start obviously just release the trigger, and it should go back to an idle. It may smoke a little if there was an access of fuel in the crankcase, you can give it a couple full throttle bursts, just a few seconds and the smoke should clear up.
I hope this helps, let me know if it works or we can try something else.
Karla
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been there, done that. should i replace the plug anyways? I went to get a new one and a know-it-all smart a$$ at the store sold me the wrong one - if the guy is irritating,, he should at least be right, no? it occurs to me that i should get a friend to hold the plug next to a metal surface and crank to see if i get a spark? or what else?
in other news, have you tried out the battery powered husky? i'm thinking of selling the 435t when it gets better and to go battery if it is a powerful (relatively) and reliable saw. seems like the ultimate hassle free solution.
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ah. replaced the plug. he got it right this time. Did he say sorry? Need you ask.
Installed plug, did the trigger down thing, and I'm rolling. Thanks.
You still have to teach me how to tear down and clean out my carb. When you have time.
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Reuven,
Glad that you got it running! Good Job!
Also, I always use the acroynm "FACTS", which stands for checking the "Fuel", "Air", "Compression", "Timing - if applicable", and "Spark". Its a good acroynm to remember, and I usually don't check any of those items in a specific order it just depends on the symptoms. When I get a used saw that someone else worked on, then I check everything including removing the flywheel, and checking the flywheel has a key in the keyway. Lol.
I would be glad to help you rebuild some carburetors, so start collecting some that you would like to re-build. I usually find mine at re-cycle and landfill centers, people don't want to be bothered and usually throw equipment away. Its also nice If you can get a variety of different ones from different manufacturers, and different types, Its really interresting seeing different ones. Husqvarana uses alot of "Zama" and "Walbro" carburetors, anyhow start collecting a few and we will get started.
Bye for now,
Karla
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