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Need help getting the head off


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#1 Nascar3244888 OFFLINE  

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Posted November 01, 2011 - 04:03 AM

I cant seem to figure out how to get the head off the tecumseh oh 140. Its almost like the head has a bolt under the top cover where the rockers are. Its like the top cover is only being held on by the springs but how do you remove them when you cant put pressure on the bottom sides of the valves. What exactly do I need to do next??? Rockers and push rods are removed as well as the 3 bolts inside the rocker cover that bolt them to the head itself....Please Help it needs new rings.....Heres a recent pic....

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#2 awol OFFLINE  

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Posted November 01, 2011 - 04:50 AM

I think you will find it the manual section.
Tecumseh cast iron 8 to 18hp engine manual - Manuals - Garden Tractor Talk - Forums

#3 EricFromPa ONLINE  

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Posted November 01, 2011 - 04:53 AM

Sounds like you missed a bolt or 2.

Here's a couple Pics that may help.

Posted Image

Posted Image

There are 6 bolts.
You need to take the valve springs off to get the bottom rocker box off of the head.

Getting them off is the easy part.Grab a socket that will sit on the top and give it a light tap with a mallet.The keepers will jump rite out.

Or go get a cheap OHV spring compressor.
Powerbuilt® Cam-Style Valve Spring Compressor - ToolSmithDirect.com

Harbor Freight has a really cheap set for like $5.00 if you have one of those stores close by.
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#4 EricFromPa ONLINE  

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Posted November 01, 2011 - 05:01 AM

After you get the head off I would Lap the valves and replace every one of the rubber O rings as they tend to get hard and crack.The OH Tecumseh engines are notorious for leaking oil around the push tubes and where the rocker box seats around the valve guides.

#5 poncho62 ONLINE  

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Posted November 01, 2011 - 05:35 AM

Doesnt look to me, by those pics, that a spring would be in the way if the head bolts

edit...Ahhh...the box...never mind...lol

#6 Nascar3244888 OFFLINE  

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Posted November 01, 2011 - 11:25 AM

Thanks for the help everyone!!!!

#7 Nascar3244888 OFFLINE  

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Posted November 01, 2011 - 03:44 PM

It Worked!!! Here are some pics...Got a question though...one out of the two studs that can be removed from the rocker arm box that get screws in them to hold the top ohv cover on broke, it is shown in the one pic...is there an easy way to get that out??? Thanks Again for the help!!!

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#8 EricFromPa ONLINE  

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Posted November 01, 2011 - 04:18 PM

Ouch broken off Way down in there isn't it.
If the stud would of been a bit bigger an easy out would do the trick.Unless you have a very steady drill hand and a really small easy out.
I don't see a way around it though.Drill it out and tap new threads.Looks like it was cross threaded last time it was off.

A slightly bigger bolt or stud shouldn't hurt anything.
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#9 LPBolens ONLINE  

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Posted November 01, 2011 - 09:27 PM

You could always see if someone had an undamaged rocker box. When those engines fail, it usually isn't the rocker box. It is usually a dropped valve guide.
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#10 Nascar3244888 OFFLINE  

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Posted November 02, 2011 - 03:48 AM

I will see if I can do anything with it and if not then I will see about getting another one

#11 Bruce Dorsi ONLINE  

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Posted November 02, 2011 - 07:34 AM

A left-hand drill bit in a reversible (rotation will need to be in reverse) drill press is the best option for removal.

A left-hand drill bit in a reversible hand-held drill may work if you can keep the bit centered.
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#12 Guest_jdecker94_*

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Posted November 02, 2011 - 06:15 PM

the dewalt bits seem to work best with no walking. centerpunch the center where you want to drill and just do in as straight as you can. i messed the one side of the kohler block up so the one bolt went in at a wierd angle and it still went fine. hope it works good for you.




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