Jump to content

Nominations for Tractor of the Month
Garden Tractors and Parts on eBay



Photo
- - - - -

Aaargh, I hate Tecumseh carbs.


  • Please log in to reply
7 replies to this topic

#1 IamSherwood OFFLINE  

IamSherwood

    Elf guardian

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 2066
  • 8,379 Thanks
  • 7,696 posts
  • Location: Northern Ontario

Posted May 29, 2011 - 09:43 PM

I just have to vent.
I spent a good part of the weekend working on 2 of them.:wallbanging:
They are so finicky. Dealing with them is worse than trying to figure
out what that meowing cat wants at 4 in the morning, when you have a
hangover.

If I ever find the guys that designed/built those things, well, I just don't
know what I'll do, but for sure, they're going to need a rebuild kit
for themselves.

There, that feels better.:orangecool:
I was working on a V60, and H70. Still not 100%, but getting there.
  • caseguy said thank you

#2 caseguy OFFLINE  

caseguy

    Connoisseur of Rusty Junk

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 906
  • 1,624 Thanks
  • 5,600 posts
  • Location: Edinburg, PA

Posted May 30, 2011 - 12:32 AM

Thanks Sherwood! I thought I was the only one! Carburetors in general are not really my thing, so when they're finicky I have 3X the trouble. I'm not a big fan of the older Briggs diaphragm carbs either! I'm with you on this one!

#3 ad356 OFFLINE  

ad356

    Tractorholic

  • Senior Member
  • Member No: 3766
  • 9 Thanks
  • 160 posts

Posted May 30, 2011 - 08:42 AM

i hate those diaphragm carburetors. i never liked those junky little 3.5 HP engines. wind vane governor, diaphragm carburetors. the quantum that replaced that engine was/is a much better lawnmower engine. Tecumseh was never my favorite brand anyways. they arent the best and now they are out of business of producing engines, to my knowledge

#4 JDBrian OFFLINE  

JDBrian

    Super Moderator

  • Super Moderator
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 2507
  • 9,574 Thanks
  • 14,136 posts
  • Location: Hubley, Nova Scotia - Canada

Posted May 30, 2011 - 09:44 AM

I agree. Carb's are a bit of a challenge for me as well. I'm trying to learn more about them. My policy is that if they are working I don't mess with them. A couple of times I thought the carb's were the problems only to find out it was another issue.

#5 Bruce Dorsi ONLINE  

Bruce Dorsi

    Old, but not dead -- yet!

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 1525
  • 3,169 Thanks
  • 2,142 posts
  • Location: New Jersey

Posted May 30, 2011 - 06:08 PM

You may or may not know this about some Tecumseh carbs.

Some of the passages in the carb are drilled after the carb is assembled. .....If the carb is taken apart then reassembled, there is very little chance of the passages lining up again.

The brass hex jet/nozzle which unscrews from the bottom of the bowl has two holes through its side. .....One hole is easily visible, but the other hole is much smaller and may be hidden in the threads.

Replacement nozzles (Tecumseh's term) were recommended whenever certain carbs were disassembled. ......There was an annular groove around the replacement nozzle where the hole is located. .....This allowed the gas to reach the passage regardless of the final positioning of the nozzle.

A picture would make this very clear, but I don't have one.

#6 IamSherwood OFFLINE  

IamSherwood

    Elf guardian

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 2066
  • 8,379 Thanks
  • 7,696 posts
  • Location: Northern Ontario

Posted May 30, 2011 - 08:03 PM

The issue about these carbs that bugs me, is the float needle/seat arrangement.
How can one expect a pointy needle to land in that hole in the seat, which has about 3/32" of flat surface, that the
point could land on.
A tapered seat, is not rocket science.

Is there a substitute carb for say a Tecumseh V60 or H70 or V50 or V80? Not made by Tecumseh.

#7 Bruce Dorsi ONLINE  

Bruce Dorsi

    Old, but not dead -- yet!

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 1525
  • 3,169 Thanks
  • 2,142 posts
  • Location: New Jersey

Posted May 30, 2011 - 09:45 PM

The issue about these carbs that bugs me, is the float needle/seat arrangement.
How can one expect a pointy needle to land in that hole in the seat, which has about 3/32" of flat surface, that the
point could land on.
A tapered seat, is not rocket science.

Is there a substitute carb for say a Tecumseh V60 or H70 or V50 or V80? Not made by Tecumseh.


If you look closely at the float valve seat, you will see it is not the same on both sides.

I always installed the float valve seat with the flat side toward the needle. .....If the tapered hole is toward the needle, the needle would often get wedged in the closed position, sealing off the flow of gas.

The needle is guided by the bore it fits into. .....There is very little clearance for the needle to move off-center.

I don't know of any other carbs that fit.

#8 middleageddeere OFFLINE  

middleageddeere

    Tacos!

  • Senior Member
  • Member No: 2033
  • 243 Thanks
  • 1,082 posts
  • Location: MI

Posted June 06, 2011 - 05:48 AM

I had similar issues, this was my solution. New 6.5 HP Engine, Replaces Honda, Briggs & Stratton | eBay
Bolts right in my MF-7.




Top