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Old 12-15-2013, 08:02 PM
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ed2hess ed2hess is offline
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Location: Austin Texas 78727
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Relative new Echo PB620 Engine Failure

Crews brought the unit in and reported it was starting hard. When I pulled the rope there was a little drag as the piston reached the top. I pulled the head and found cracked ring. So I pulled the unit completely apart and found that the lower crank had too much wear. I went to my used part and found a better one.

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The only new parts were rings,2 crank seals,2paws in recoil, and a couple gaskets.

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The engine mounted to one side of the fan cage. Next you mount the fan onto the flywheel and put the on the other half of the shroud.

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The unit started and ran but I did have to get a different carburetor out of my used parts. Used it today and good to go.

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This is the first engine failure I have seen on a unit that is less than 3 years old. I think this darn big filter is letting dust get in the engine somehow. Any opinions on this?


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  #2  
Old 12-16-2013, 10:36 PM
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Breezmister Breezmister is offline
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Quote:
Originally Posted by ed2hess View Post
This is the first engine failure I have seen on a unit that is less than 3 years old. I think this darn big filter is letting dust get in the engine somehow. Any opinions on this?
The old Tanaka TBL 500s had a set up like that, with a connector between the carb and the air filter asy on top. What I did was add two old style Lawn Boy round air filters at the front of the carb inside the tube that connects the air filter. Then take some good electrical tape and seal the connector at both ends before I clamped the ends back on.

Can't say if it really made a difference, just made me feel better about their poor design.....
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Old 12-16-2013, 11:15 PM
MRCo. MRCo. is offline
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This rubber intake 'elbows' can crack at the ends as thy age, letting dust by.
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  #4  
Old 12-17-2013, 10:10 AM
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ed2hess ed2hess is offline
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Quote:
Originally Posted by Breezmister View Post
The old Tanaka TBL 500s had a set up like that, with a connector between the carb and the air filter asy on top. What I did was add two old style Lawn Boy round air filters at the front of the carb inside the tube that connects the air filter. Then take some good electrical tape and seal the connector at both ends before I clamped the ends back on.

Can't say if it really made a difference, just made me feel better about their poor design.....
You got the same feeling that I had about the filter. I am going to take your suggestion. I was out the dealer Saturday and there was another 620 on the bone pill. I am going to take it apart for parts but will see what failed.

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