Toro Model # 20018 with Tecumseh LEV120 - Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum
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post #1 of 15 (permalink) Old 07-23-2019, 09:54 AM Thread Starter
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Toro Model # 20018 with Tecumseh LEV120

Hello everybody,
I bought this lawnmower used and it ran pretty well until I hit a rock. Everything came to a screeching halt, I took the flywheel off and the key was shot. I got a replacement and put it back together. I tried starting it and even though it started it was hard to get it going. Now it runs for 5 minutes and cuts out.
I took the head off to check the valve clearances and they were about .008 ". I left them alone since they're within spec. I put a new head gasket and torqued the head to 200 in/lb. I'm not sure if the compression is any good, I measured about 55-60 lbs ... but I don't know if this engine has any decompression mechanism.
Last time I tried to start it it ran but poorly and it sounded like the RPMs were real low, perhaps I misplaced the arm for the governor and it just has to be bent back a little.
I have the following questions:
1- Is the compression good enough
2- Should I re-adjust the valves
3- Is there anything else I can do to make it run properly

Thank you so much for the advice,
Henry.
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post #2 of 15 (permalink) Old 07-23-2019, 12:13 PM
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I think that motor does have a compression release, but I've never had one with compression that low honestly. I'm a bit confused about your valve clearance because the LEV120 engines that I'm familiar with are a side valve design, if I'm not mistaken, and so you would check the clearance between the valve stems and the lifters by removing the stamped steel plate on the side, not by pulling the head. The other issue is that, assuming the crankshaft is not bent, the plastic teeth on the camshaft could very well be damaged, or the compression release could be broken, causing it to be unable to fully disengage. The camshaft in these motors is a cast piece with a plastic ring of teeth molded onto the part that engages the crankshaft, and I've seen them get partially sheared or damaged from a shock to the blade.

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post #3 of 15 (permalink) Old 07-24-2019, 10:53 AM Thread Starter
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Hi Motorhead,

I did not mention it but the valve clearance measurement was taking after removing the plate on the side, the reason why I removed the head was to make sure I was at TDC and to check the cylinder head and how the valves were seated.
BTW how do I adjust the valve clearances when a little too large?

Thanks,
Henry.
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post #4 of 15 (permalink) Old 07-24-2019, 11:51 AM
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If you had significantly too much valve clearance, you would have to do a valve job by grinding the seats down and resurfacing/lapping the valves in. There's no way to adjust the valves with a turn of a nut like on an OHV engine. However, sounds like your clearance is fine, so it's not the source of the problem. You may have to split the engine to see if the cam is busted or it there's other mechanical damage...
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post #5 of 15 (permalink) Old 07-26-2019, 10:03 AM Thread Starter
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Thanks Motorhead for the assessment.
It's hard to be sure if the primer on this engines work as you don't hear or see if any gas is flowing so I took the carb off and cleaned really well. I tried starting the engine and it was really hard, I had to use the electric started as my arm got very tired of pulling ... if did start but in about 2-3 min started to miss and eventually died. I'm not sure if is worthy to open it up and see what's wrong with it.
If anybody has a LEV120 for sale let me know.

Thanks,
Henry.
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post #6 of 15 (permalink) Old 07-31-2019, 04:31 PM Thread Starter
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I took the engine apart but did not see anything wrong with it, but then again I'm not an expert so what do you guys think? Here are some pictures:

The only thing I can think of is the crankshaft being bent.

Thanks for the comments.
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post #7 of 15 (permalink) Old 07-31-2019, 11:29 PM
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1. It looks like the timing marks on the camshaft and crankshaft are not aligned. You're off by one tooth.
2. And, of course, your tappets (valve lifters) are lying in the bottom of the crankcase there.
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post #8 of 15 (permalink) Old 08-01-2019, 08:21 AM Thread Starter
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I know about the timing marks, I'll get them aligned.
The tappets fell out when I tilted the engine, how do I know which is which?

Thanks,
Henry.
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post #9 of 15 (permalink) Old 08-01-2019, 10:28 PM
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The lifters should both be the same.
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post #10 of 15 (permalink) Old 08-03-2019, 04:01 PM Thread Starter
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Okay, thanks Tabora.
Does anybody know the part # for the shaft key to the adapter that holds the blade?

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