Flywheel grind on startup -
  • 1 Post By bruinjeeper
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post #1 of 4 Old 08-26-2016, 01:13 AM Thread Starter
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1999 TJ Wrangler 
Join Date: Jan 2013
Location: Tehachapi
Posts: 33
Flywheel grind on startup

Hey all,
Starting my jeep the last few days, every third start or so i get a horrible grind from the flywheel when I engage the starter, it seems the starter engages the flywheel, grinds and gets stuck all in the same key turn. I release the key and try again and it gets out of it and starts right up.

Do I have a chipped tooth (or teeth) in my flywheel?

I've gone through 3 starters this year, and replaced the flywheel 2 years ago when I replaced the engine.

I'm wondering if this engine really came out of a 93 yj, or maybe a 95, because at the parts store, the starters have different number of teeth.

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post #2 of 4 Old 08-26-2016, 05:45 AM
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1987 YJ Wrangler 
Join Date: Jun 2008
Location: Newnan
Posts: 2,834
I would get under the jeep and look at the starter maybe it came lose and is eating into the flywheel? After my starter fell out of my jeep on a drive I learned to use loctite on all the starter bolts. See if it's moving or angled.

-1987 YJ

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post #3 of 4 Old 08-26-2016, 05:34 PM
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1995 YJ Wrangler 
Join Date: Jun 2013
Location: Toronto
Posts: 10,465
unsure and haven't done much research on the topic.... but it may have a shim and not require it.... or require a shim and not have it.

Think this is pertinent to certain years/models. SOmeone else will surely chime in on this
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~YJOTM MAY '16, JULY '19~

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post #4 of 4 Old 08-28-2016, 02:13 PM
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1990 YJ Wrangler 
Join Date: Jan 2009
Location: NA
Posts: 1,622
A very common problem. Some starter motors mount with metric bolts and some use SAE bolts. It often happens that somewhere along the line someone used an SAE bolt in a metric hole, or vice-versa. It seems that the bolts are tight but they cannot handle the torque of the starter motor and the starter wiggles enough to move the starter pinion too far from the ring gear on the flywheel or flexplate.

The teeth on your flywheel or flexplate are fine. Make sure that you have the right bolt in the right threaded hole and that the threads are not half eaten away.

The fix is simple: a helicoil. It takes five minutes and can be done under the vehicle with no disassembly save for removing the starter.
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