The Jack's Small Engines Forum - Join Our Online Community
Reply to post

Tecumseh 2 cycle snowblower engine: How much compression to run?

Author
MTD20Bantom
Starting Member
  • Total Posts : 7
  • Scores: 0
  • Reward points: 0
  • Joined: 2018/11/27 08:11:57
  • Status: offline
2018/11/29 07:01:19 (permalink)
0

Tecumseh 2 cycle snowblower engine: How much compression to run?

I was given an old 20" MTD Bantom snow blower.  It has a 2 cycle Tecumseh engine with the number 1589A on a tag.
 
How much compression (min.) does it need to run?
 
Trying to decide if it might need new rings soon or not.
 
Thanks.

7 Replies Related Threads

    AVB
    Super Member
    • Total Posts : 729
    • Scores: 31
    • Reward points: 0
    • Joined: 2017/06/21 16:35:48
    • Location: Elora, TN
    • Status: offline
    Re: Tecumseh 2 cycle snowblower engine: How much compression to run? 2018/11/29 07:46:05 (permalink)
    0
    Most 2 cycles that I have worked on needs at least 100 psi to even try to run. Good normal compression is around 120 psi minimum.
     
    Please be aware many Tecumseh parts are NLA since the Tecumseh original manufacture has been out of business since 2009. The group that took over the Tecumseh line only provides parts for the newer that they built after 2009.
     
    Also 2 cycle equipment will wear both the rings and cylinder requiring a new oversized piston rings just like 4 cycle equipment. Now if this the 1500-1589A these are not available, only the standard sizes. With this in mind there is only a 50/50 chance that you simply need rings.
     
    Either way you got to figure out which engine model you do have to even get the correct parts list lookup to see even if the parts you are wanting are available or not.
    MTD20Bantom
    Starting Member
    • Total Posts : 7
    • Scores: 0
    • Reward points: 0
    • Joined: 2018/11/27 08:11:57
    • Status: offline
    Re: Tecumseh 2 cycle snowblower engine: How much compression to run? 2018/11/29 09:23:02 (permalink)
    0
    Thanks, maybe my equipment isn't working properly.  I'm only getting about 80 psi.  It ran fine about 2 years ago then got sat with gas in the tank.  I am in the process of a carb rebuild and thought I'd try to run a compression test when I found the low reading.  I'll see if I can borrow a buddy's gauge and try it again.  I just wanted a reference.  Thanks for your input.  
    Roy
    Moderator
    • Total Posts : 542
    • Scores: 15
    • Reward points: 1
    • Joined: 2016/07/27 22:51:23
    • Location: British Columbia
    • Status: offline
    Re: Tecumseh 2 cycle snowblower engine: How much compression to run? 2018/11/29 11:29:30 (permalink)
    0
    It is highly unlikely that a 2 stroke snow engine would be worn out, they normally don't get enough use. Poor quality oil or improper fuel mix are more common causes of failure. Remove the muffler and check for piston scoring and/or signs of excessive blowby.
    AVB
    Super Member
    • Total Posts : 729
    • Scores: 31
    • Reward points: 0
    • Joined: 2017/06/21 16:35:48
    • Location: Elora, TN
    • Status: offline
    Re: Tecumseh 2 cycle snowblower engine: How much compression to run? 2018/11/29 11:40:34 (permalink)
    0
    Correct that lack of proper fuel/oil are the main cause of cylinder destruction but some engines do get enough use to wear out. I just had 3 Echo SRM-225 trimmers that were only 2 years old used commercially to wear completely through the plating. I also retired my McCulloch Mac Cat chainsaw after 30 yrs because of the same thing.
    MTD20Bantom
    Starting Member
    • Total Posts : 7
    • Scores: 0
    • Reward points: 0
    • Joined: 2018/11/27 08:11:57
    • Status: offline
    Re: Tecumseh 2 cycle snowblower engine: How much compression to run? 2018/11/29 12:56:02 (permalink)
    0
    I inherited this machine when I got married 13 years ago and it had been given to her by her Uncle who bought it at a yard sale.  It's been running strong for over 13 years now, but I did park it 3 years ago (and apparently never drained the gas, which is why I'm cleaning the carb).  I did take the exhaust off and looked at the piston.  It didn't look scored but it was dark (carbon deposit?).  
     
    How exactly do you check blow by?
     
    I'll try to finish the carb this weekend and try to start it...and let you know how it goes.  I'll also run another compression test this weekend too.
    Roy
    Moderator
    • Total Posts : 542
    • Scores: 15
    • Reward points: 1
    • Joined: 2016/07/27 22:51:23
    • Location: British Columbia
    • Status: offline
    Re: Tecumseh 2 cycle snowblower engine: How much compression to run? 2018/11/29 20:02:52 (permalink)
    0
    Snow engines don't normally see that kind of use, I didn't put 10 hours a season on any of mine although they worked hard when I needed them. From the sound of it there is little to worry about with that Tecumseh, a carb kit and fuel line should get 'er barking.
    MTD20Bantom
    Starting Member
    • Total Posts : 7
    • Scores: 0
    • Reward points: 0
    • Joined: 2018/11/27 08:11:57
    • Status: offline
    Re: Tecumseh 2 cycle snowblower engine: How much compression to run? 2018/12/03 10:08:18 (permalink)
    0
    Carb kit installed (cleaned the carb and the kit came with a new diaphram), it fired up and ran after the gas reached the carb.  Took a bit to get it to warm up; typical as I recall.  The choke has two positions.  Initial start uses full choke for a cold start.  Once it warmed up, the engine would stall with choke off.  Runs and surges at partial choke, but when I place it under load of the auger ON, I can go with choke off and it runs good.  
     
    I think it just needs a few tanks of gas run through it once we get some snow.
    Jump to:
    Copyright © 1994 - 2016 Jacks Small Engine & Generator Service, LLC