How to diagnose between starter problem or bad flywheel - JeepForum.com

 
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post #1 of 9 Old 09-11-2011, 03:28 PM Thread Starter
weerwolv
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1993 YJ Wrangler 
 
Join Date: Apr 2004
Posts: 311
How to diagnose between starter problem or bad flywheel

Hi all,

My 1993 YJ 4.0 with AX15 is not starting well . Sometimes it will catch, other times it will not and their is a hell of a grinding sound.

How would one diagnose between chewed flywheel vs bad starter?

One way I guess would be visual by dropping the starter.

Any recommendations on how to go about step by step?

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post #2 of 9 Old 09-11-2011, 03:45 PM
SpikesHD
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1987 YJ Wrangler 
 
Join Date: May 2011
Location: Rogers
Posts: 221
I recently had to replace my starter and flex disk. It would make an awful grinding noise and then start on the next try. The engine only stops in certain places (seems like there were three bad spots on mine) and once a bad starter chips those teeth everything goes South.

Unfortunately the new starter has already chipped a few teeth on the new plate. it's REALLY LOUD too! Scared the pants of bystanders when I start it.

A new starter would likely help for a while but I suspect your flywheel will need to be replaced.

Si vis pacem, para bellum.
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post #3 of 9 Old 09-11-2011, 04:29 PM
moonshinefuel
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Location: Los Angeles. California. United States.
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Whatever you do, disconnect the battery before dropping the starter. Then get a visual.
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post #4 of 9 Old 09-11-2011, 08:01 PM
burnout189
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1993 YJ Wrangler 
 
Join Date: Mar 2003
Location: Waynesboro PA
Posts: 625
its uncommon for the flywheel to need replaced.

9 times out of 10 you just need a starter. but yes the only real way to know is remove the starter and take a look.

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post #5 of 9 Old 10-31-2013, 03:11 PM
95yj0645
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1995 YJ Wrangler 
 
Join Date: May 2010
Location: indiana
Posts: 365
Ok not trying to dig up an old thread but my ol POS is doing the same thing. I had a spare NEW starter so I put it in and it seemed to help for a few weeks but now its every single time I start my jeep it grinds. Itll run horrible for a minute or so and then its like a switch gets flipped and it runs fine. its an autozone flywheel (put in when I built my 4.6)
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post #6 of 9 Old 11-01-2013, 05:35 AM
kloppk
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1992 YJ Wrangler 
 
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If you find the ring gear is badly worn you can flip the ring gear and put it back on the flywheel so that the good side of the ring gear teeth now towards the starter.

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post #7 of 9 Old 11-01-2013, 09:51 AM
superj
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1987 YJ Wrangler 
 
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Location: corpus christi
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If you keep eating starters and flywheels, it might be the wrong starter on the vehicle. Two came on our jeeps, a ford type and a Mitsubishi type. One has a solenoid on the firewall and one has a solenoid on the starter and they have different lengths on the nose because the gears pop out a different distance

I don't feel like working on anything, at this time.
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post #8 of 9 Old 11-01-2013, 09:52 AM
superj
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What decides which starter to use is the year flywheel you have in the trans

I don't feel like working on anything, at this time.
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post #9 of 9 Old 11-04-2013, 06:13 AM
vadslram
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1990 YJ Wrangler 
 
Join Date: Jan 2006
Location: VA Beach
Posts: 6,143
Garage
Step one, disconnect ground wire from battery
step two, remove starter.
Step three, Look at pinion gear on starter
Step four, take to AP store and have them put it on testor. It will tell you if the bendix is fully extending and if it has enough torque to engage.
Step five, look at teeth on ring gear while turning the engine using ratchet on vibration damper.

At any point if you see a problem feel free to stop and fix it
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