MTD 42' Riding mower

all_wet(MagnoliaTx)November 2, 2008

I have a 12 yr old MTD that doesn't want to start. Battery was replaced earlier this summer, but wont charge. Jumping wont turn it over enough to start. Is the alternator built in the starter? Where can I find a replacement starter/alternator?

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canguy(British Columbia)

Can you give us the model number of the engine? If it is an overhead valve check the valve clearances and adjust if needed.
The starter and alternator will be separate units and expensive to replace so do some troubleshooting first.

    Bookmark   November 2, 2008 at 7:24PM
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It's a Briggs 14.5 HP OHV Model unknown at this point.

    Bookmark   November 2, 2008 at 9:11PM
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The charging coil is underneath the flywheel, since the starter stops turning when you release the key. My guess would be fuel. To check this, either spray or pour a small amount of gas into the carb. If it doesn't fire, I would next check for spark.

    Bookmark   November 2, 2008 at 11:18PM
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Adjust the valves!
There are numerous posts in the TRACTOR forum about Briggs OHV engines being difficult to crank over.

At least you haven't replaced the starter motor & solenoid too, which are usually steps 2 & 3 the poster does when a valve adjustment was all that's necessary.

IF the valve lash gets too excessive, the compression release doesn't work!

    Bookmark   November 3, 2008 at 2:32PM
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Thanks Bill and Canguy.
The engine will slowly turn over, but not fast enough to actually start it. It sounds as if a valve adjustment is in order. I'll go look in the tractor forum to see if I can find one of those posts!

    Bookmark   November 3, 2008 at 3:11PM
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Thanks guys!
I adjusted the valves as recommended to 4/1000 of an inch and she starts and runs great now! Thanks again for steering me in the right direction!

Here is a link that might be useful:

    Bookmark   November 8, 2008 at 5:42PM
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I bought a used Murray 42" 20HP riding Mower and it came with a 40" MTD Snow Thrower attachment with braces belts etc. would you know what the part # for this is, or how I could get a site to download assembly instructions.
Or if it's even interchangable with the Murray Mower.

    Bookmark   November 9, 2008 at 11:47PM
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