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'68 Sears Super 12's.


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#1 Dane in PA OFFLINE  

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Posted September 15, 2013 - 09:10 PM

I recently acquired two '68 Super 12's (traded the 10XL and 8e, as I have a bigger area to mow, and these seem to fit the bill with the big deck) and have been having engine issues all over the place.  The one blew up the second day I had it, and when I changed the heads on the engines (needed to to change over the tins) I broke off three of the head bolts.  Anyone know a good way to get these out?  They broke off in the threads.  Thanks in advance.  Here they are, as they sit right now (Been cleaning out my garage).  The rougher of the two is being used as a parts tractor, but may eventually make a return.  I also got a snowplow in usable condition.

 

0915131944.jpg


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#2 MH81 ONLINE  

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Posted September 15, 2013 - 09:17 PM

Ouch. Sorry to hear it Dane. If they are broke off below level, I'm afraid you're in for drill and tap. Be really careful and you might get lucky.
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#3 Dane in PA OFFLINE  

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Posted September 15, 2013 - 09:20 PM

Ouch. Sorry to hear it Dane. If they are broke off below level, I'm afraid you're in for drill and tap. Be really careful and you might get lucky.

 

I think I may try and dig into the other one to see what is wrong, and possibly put the good internals of the one into the other if it's not too bad?  If not, I'm probably in for another motor...



#4 MH81 ONLINE  

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Posted September 15, 2013 - 09:24 PM

You said " blew up" , what did it do?
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#5 Dane in PA OFFLINE  

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Posted September 15, 2013 - 09:59 PM

You said " blew up" , what did it do?

 

Well,  It had a little bit of a knock when I got it.  I ran it to about 3/4 throttle and it just stopped dead.  Has compression, but there is a really loud "ker-chunk!" when you turn it over.  Figured it's pretty much toast. 



#6 Dieselcubmike OFFLINE  

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Posted September 16, 2013 - 12:40 AM

Aweee you got rid of a custom? :(


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#7 Dane in PA OFFLINE  

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Posted September 16, 2013 - 04:50 AM

Aweee you got rid of a custom? :(

 

Two...   But I got Suburbans in return.


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#8 robert_p43 OFFLINE  

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Posted September 16, 2013 - 07:31 AM

I am not very good at drilling a bolt dead center.  I would have to take it into a machine shop and have them do that for me.  Hoping someone more experienced can offer a better solution than I have.



#9 Dieselcubmike OFFLINE  

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Posted September 16, 2013 - 10:29 AM

Well I have a plow for sale if your ever looking for one.


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#10 Dane in PA OFFLINE  

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Posted September 16, 2013 - 08:00 PM

Well I have a plow for sale if your ever looking for one.

 

Got that covered, but thanks!

 

0916132013b.jpg

 

 

More pictures!  Just cleaning up the shop at this point.

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#11 Dane in PA OFFLINE  

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Posted September 17, 2013 - 04:53 PM

Figured out what is wrong with the one engine.  The cam snapped in half and most of the teeth broke off.  I'm thinking I can reuse the block and maybe just put the other engine's cam in?  This engine is in much better condition other than the broken part.  Does anyone know what the timing should be???  Thanks.



#12 MH81 ONLINE  

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Posted September 17, 2013 - 05:59 PM

Figured out what is wrong with the one engine. The cam snapped in half and most of the teeth broke off. I'm thinking I can reuse the block and maybe just put the other engine's cam in? This engine is in much better condition other than the broken part. Does anyone know what the timing should be??? Thanks.

Dane, I've run into two timings.
One is the notched tooth matches up to the stamped dot.
The other is two teeth off (and no, I don't remember which way). These were special order units that Teccy made so that the general public couldn't work on them. My Uncle clued me into them after going 6 "rounds" with an 8Hp engine...Odds are, you do not have one of those, I think they were smaller units than what you're dealing with.

IMHO, the bigger q is what broke the cam? Not exactly normal to have one fail like that, but it can happen.

#13 Dane in PA OFFLINE  

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Posted September 17, 2013 - 07:35 PM

Dane, I've run into two timings.
One is the notched tooth matches up to the stamped dot.
The other is two teeth off (and no, I don't remember which way). These were special order units that Teccy made so that the general public couldn't work on them. My Uncle clued me into them after going 6 "rounds" with an 8Hp engine...Odds are, you do not have one of those, I think they were smaller units than what you're dealing with.

IMHO, the bigger q is what broke the cam? Not exactly normal to have one fail like that, but it can happen.

 

I'm thinking a lack of lube during operation, causing the cam to seize on the cam end, letting the gear end to take the brunt of it.  The guy said it developed a bit of a knock before he got it to his shop.  :P



#14 Dane in PA OFFLINE  

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Posted September 17, 2013 - 07:55 PM

More shop update pics and some pics of the broken cam.

 

0917131626.jpg

 

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Spider-boy...

 

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#15 MH81 ONLINE  

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Posted September 17, 2013 - 08:50 PM

Anything extra when you pulled the head? Carbon, etc.
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