Jump to content
gumshoes

6hp tecumseh Blowbye

Recommended Posts

I have a new 657 with a 6hp Tecumseh that had a new short block installed several years ago. The tractor had sat for the past 5 years. I installed a new carb and changed the oil twice. The engine runs great and doesn't smoke. I am getting some oil coming from the breather tube. It doesn't do it all the time but when it does it comes out pretty good. I installed a new breather filter and the oil level is good. What could be causing it. Thanks guys...

Share this post


Link to post
Share on other sites

Maybe a ring is sticking where it sat so long.  Use it for awhile and see if it clears up.  :)

Share this post


Link to post
Share on other sites

I have two Tecumseh that do the same thing the one on my lawn ranger witch I've used quiet a bit this summer seems to have stopped now maybe the more u run it it will stop

Share this post


Link to post
Share on other sites

I took the head off and cleaned the valves which were gross. I cleaned the head and the top of the piston. It runs great now.

  • Like 1

Share this post


Link to post
Share on other sites

That's the fast way to do it!   :text-+1:

Share this post


Link to post
Share on other sites

Spoke to soon. After I ran it for a little bit it started blowing oil again. What doesn't make sense is that it runs so nice and doesn't smoke at all. Also it doesn't do it all the time. It will do it for a few minutes then spot for a few minutes.

Share this post


Link to post
Share on other sites

Something must be trying to work itself out, give her time.  :)

Share this post


Link to post
Share on other sites

Ya I hope so Geno. She runs so nice. I've been waiting to buy this tractor for 15 years. It belonged to my buddies dad and I told him 15 years ago that I would buy it when he decided to get rid of it. I hadn't seen it since and forgot what model it was. I was excited when I got the call last week. It has sat for the past 5 years and he installed a new short block several years ago. It did come with a near mint 1955/56 utility cart, a deck and plow. Have a great night.

  • Like 1

Share this post


Link to post
Share on other sites

I went to the mid month meet and greet and there was a beautiful lawn ranger in Larry's horse barn and it even had oil down the front of the engine I just think its very common thing for the teckys I put a piece of air hose on mine so it goes down to the ground instead all over the motor

Oops meant mid mo meet and great

Share this post


Link to post
Share on other sites

Don't keep them clear up to the full mark, down just a tad

And that will help a bunch. I think they are splashing oil up around the valve stems

Not so much a blow by thing.

Don't keep them clear up to the full mark, down just a tad

And that will help a bunch. I think they are splashing oil up around the valve lifters and stems

Not so much a blow by thing. Keep mine down a couple ounces after it slobbered

Oil all over the whole front end, oh well a good rust inhibitor up there I guess!

Edited by specialwheelhorse
  • Like 1

Share this post


Link to post
Share on other sites

the crank case is filling up with air clean the crank case filter 

Share this post


Link to post
Share on other sites

I went to the mid month meet and greet and there was a beautiful lawn ranger in Larry's horse barn and it even had oil down the front of the engine I just think its very common thing for the teckys I put a piece of air hose on mine so it goes down to the ground instead all over the motor

Oops meant mid mo meet and great

 

Just a thought...,.Could it be possible to run the hose up instead of down? Might not loose any oil at all.

Share this post


Link to post
Share on other sites

I know mostly my fixes are prob misunderstood on the prob, but if I'm understanding your prob, oil is blowing out of valve breather..correct.

In the past as I've cured this prob, the Tecumseh crankcase breather has a down and an up. There is a return slit or hole that needs located down allowing any oil passing through to check valve dain rather than filling up and blowing past and out. I'll try and find the picture of proper position. 

 

Also:from manual..

BREATHER PASSING OIL

1. Check the oil level, make sure the engine is not overfilled. Also verify that the viscosity rating on the container of

the oil being used is to specification.

2. Check the angle of operation. Avoid prolonged use at a severe angle.

3. Check the engine R.P.M. setting for excessive R.P.M. using a vibratach or other tachometer and compare it to the R.P.M. settings found on microfiche card # 30 according to the engine model and specification number. Adjust the high and low R.P.M. as necessary.

4. Check for leaking or damaged gaskets, seals, or "O"-rings. External leaks may not be evident; however, the leak may prevent the engine from achieving a partial crankcase vacuum.

5. Check the breather for damage, dirty condition, or improper installation. The oil return hole(s) must face down.

6. Check the engine compression using a compression tester. If the engine has weak compression, determine the cause of weak compression: worn rings, leaking head gasket, or leaking valves. Follow the compression tester's procedure

Edited by groundhog47

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By Team70R
      Looking to get rid of all my Tecumsehs! The HH60 ran before I pulled it, just needed carb adjustments. Electric start! The other 2 appear to be H60s but are both in rough shape. One has a broken flywheel fin, stripped out oil plug hole and a seized governer. Other one has a broken crank or rod. Pm for more details! Pick up only, at this time. 






    • By raymondvandervort
      HH60 cast block in very good shape, bead blasted and primed with zinc chromate primer, 
      with some valve parts, dimensions available. Part numbers for this block have 
      been:32176;32163;31789;32176;32176A;32176B;34761. Prepped for a project the customer abandoned.
      Also parts obtained for this project available:
      Gasket set 33235A
      Breather 28423
      condenser 30548B
      Screw 650697A
      Screw 650694A
      wiper 30549
      Breather tube 35350
      valve cap 30964
      valve cap pin 20810
      gasket 29673
      valve cap 27882
      oil seal 28460
      oil seal 27876B
      carb 631828
      valve spring 27881
      points 30547a
      governor spool 30588A
      breather filter 28424
      bearing 31793
      valve retainer 27883
      bushing 31461
      gasket set 33234A
      rod 31380C
      ring set 34854
      piston 31797B;345503;34531
    • By raymondvandervort
      HH60 cast block in very good shape, bead blasted and primed with zinc chromate primer, 
      with some valve parts, dimensions available. Part numbers for this block have 
      been:32176;32163;31789;32176;32176A;32176B;34761. Prepped for a project the customer abandoned.
      Also parts obtained for this project available:
      Gasket set 33235A
      Breather 28423
      condenser 30548B
      Screw 650697A
      Screw 650694A
      wiper 30549
      Breather tube 35350
      valve cap 30964
      valve cap pin 20810
      gasket 29673
      valve cap 27882
      oil seal 28460
      oil seal 27876B
      carb 631828
      valve spring 27881
      points 30547a
      governor spool 30588A
      breather filter 28424
      bearing 31793
      valve retainer 27883
      bushing 31461
      gasket set 33234A
      rod 31380C
      ring set 34854
      piston 31797B;345503;34531
    • By Team70R
      Got the Chinese carb installed on my HH60 and had it running decent. Tried to get it to idle by adjusting the idle screw..Well now it's a bear to start and smokes like a frieght train in the event it actually fires... Fuel shut off is suddenly stuck open as well. Had some  sediment in the fuel filter, which doesn't surprise me. 
      Why won't it start now??
    • By Team70R
      Pulled the cord on my HH60 tonight and it made a hellacious noise resulting in the cord pulling alllll the way out.... And staying out. Got an electric starter sitting on my junk H60... Will it work!!?? Or should I rebuild the pull start? 
×