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Old 07-06-2012, 08:57 PM
Kkane97 Kkane97 is offline
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Engine Rebuild

Instead of posting individual thread like I have been for problems with this motor, I will just post them all into this thread. So I solved the spark issue, new coil I dont know what was wrong with the other one, but this one works so all is good spark wise.

I finished rebuilding the top end finally today, torqued the head and filled it with oil and gas and went to start it, nothing not even a pop. My dad said it would be ok to try a squirt or to of starting fluid, no pop. So I check the spark, all is good. Spark plug sparking all good. gas in the float bowl, check. Compression... 30 lbs . If I remember right in cars, compression should be near 100lbs well I only have 30 mind you it is a small engine but IMO it just doesnt seem right.

So to you guys does my compression seem wrong, or really bad? Could that explain why I wouldnt even get a pop from the motor?

So far I have replaced a piston and rings ect...
Brand new stens carb.
new spark plug
new gaskets except the carb and head gasket ie my theory on bad comp. (if you guys agree compression isnt right, Ill be ordering a new gasket tonight)
new air filter
new gas lines
new to this motor coil
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Old 07-06-2012, 09:29 PM
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piston slapper piston slapper is offline
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Slow down a little...you're not quite ready for new paint...
What model engine do you have...
You rebuilt the top end??? What did you do to the valves ? Clean..grind..adjust ?
Did you get the cam and crank timed correctly?
Sounds like you forgot the most important part...a service manual....
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Old 07-06-2012, 09:31 PM
laman laman is online now
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You don't have enough compression for anything to happen. I would say you need 125 at minimum.
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Old 07-06-2012, 09:43 PM
Kkane97 Kkane97 is offline
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Sorry I forgot to post the info on the motor, every summer I try to rebuild something lying around our yard to get it running then sell it instead of bring it to the junkyard.

this year was a baker tornado chipper/shredder model 612 - 3.5
the motor is a tecumseh 3.5 hp model H35-45614S I havent had much luck finding a manual for it, but did find a nice breakdown on partstree.com

I didnt do anything to the valves but wipe them down on top, they seat nice and tight when they are down by eye (is there a test for that)? The camshaft is timed correctly with the crankshaft, there are 2 notches that you line up accordingly on the gear on the camshaft and crankshaft. I reused the head gasket which i think would solve my compression problem because you know how they get squished after torquing the head down.


Any other info available, thanks in advance for the help!
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Old 07-06-2012, 09:50 PM
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dutch1 dutch1 is offline
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Slapper, the poster has multiple threads. Here's the other:http://www.lawnsite.com/showthread.php?t=382734

As you said, there's multiple flies in the soup...
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Old 07-06-2012, 10:10 PM
Kkane97 Kkane97 is offline
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Thats why I just wanted to make one thread, I didnt want to be "that guy" so to speak lol
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Old 07-07-2012, 03:05 PM
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BigFish BigFish is offline
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So...... let me get this straight.
You say you rebuilt this motor ?
BUT :

1. You reused the headgasket.
2. You reused the carb gasket/s.
3. You didn't do a thing to the valves.

Did you measure the bore for wear, out of round, taper?.... Didn't think so.
Did you hone/ deglaze the cyl.?..... Didn't think so.
Did you check the rings for correct end gap?..... Didn't think so.

"But it don't got no compression"

Manuals are fairly easy to come by. I've recommended this site several times as a good place to get manuals and parts: http://www.mymowerparts.com/pdf/Tecu...epair-Manuals/
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Old 07-07-2012, 03:09 PM
Kkane97 Kkane97 is offline
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I just followed along with what my dad said to do apparently that was wrong, so last night I ordered a whole set of gaskets. I have tried and tried to find a manual for this motor or chipper but no luck
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Old 07-07-2012, 03:29 PM
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BigFish BigFish is offline
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How old are you?
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Old 07-07-2012, 03:33 PM
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piston slapper piston slapper is offline
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Quote:
Originally Posted by Kkane97 View Post
I just followed along with what my dad said to do apparently that was wrong, so last night I ordered a whole set of gaskets. I have tried and tried to find a manual for this motor or chipper but no luck
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Don't take it too personal....
You're getting advice from a few master mechanics...that take nothing for granted...even when you do everything right...some problem that you've never seen can show up...
The engine you're working on is very basic...any tecumseh 3 1/2 manual should get you straightened out...hang in there...
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