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2000 Honda Prelude crankshaft

Tiny
JOHNNYDOGG
  • MEMBER
  • 2000 HONDA PRELUDE
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 103,200 MILES
My crankshaft bolt came out it got stripped and the harmonic balancer pulley was replaced, the crankshaft was tapped and rethreaded and the new bolt was put on with some loctite, will this hold? How long? Should he have put in a helicoil? Would welding the pulley to the crankshaft work?
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Sunday, August 30th, 2009 AT 10:09 PM

6 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
HI johnnydogg,

Crankshaft pully torque specification is 150 ft lbs.

Under normal circumstances, the bolt should hold but if the pulley seats had been damaged, the excessive clearance would cause the pully to be out of lateral and this would result in additional force on the pully when it is running.

Welding pully to crankshaft should never be attempted.
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Monday, August 31st, 2009 AT 2:48 AM
Tiny
JOHNNYDOGG
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Dumb question but why shouldnt you weld it? What could go wrong if you did? Also how do you know if the pulley seats are damaged, I see very very small side to side wobble with the pulley now, is that normal or should it be totally straight turning. It's been run for 500 miles since the fix, does this increase the odds that it'll hold? Sorry but im not a mechanic so my questions may seem a bit amateur.
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Monday, August 31st, 2009 AT 6:25 AM
Tiny
JOHNNYDOGG
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And what exactly does the woodruff key do?
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Monday, August 31st, 2009 AT 6:29 AM
Tiny
JOHNNYDOGG
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  • 5 POSTS
1more thing, I feel as though the dealer in my town could have loosened my crankshaft bolt and not tighten it properly and so it became it loose, just my hunch is all, my question is how common is it for a crankshaft bolt to come loose? Would bad street driving areas help to jimmy it looose? Is that bolt under a particulary large amount of stress normally?
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Monday, August 31st, 2009 AT 6:37 AM
Tiny
JOHNNYDOGG
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  • 5 POSTS
Do you need to remove the crankshaft bolt to replace the timing belt on my 2000 honda prelude? Are some cars timing belts replaceable without removing the crankshaft bolt?
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Monday, August 31st, 2009 AT 6:45 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Welding the pulley to the crankshaft would damage it and would prevent future removal.

Pully wobbling could be due to worn seats of the pully and crankshaft seat. Recheck bolt torque to confirm it is not due to it coming loose.

Pully should be running without any wobbling.

The wood ruff key is to hold the crankshaft timing gear and pully in position. It also reinforces the strength of the pully bolt. If it is badly damaged or worn, the bolt would have nothing to assist iin holding the pully in position and sustain the torque. This would result in the pully bolt coming loose or even breaking.

If crankshaft bolts are correctly torqued, we often have problem removing them, unless the bolt breaks, if not it should not come loose. The anticlockwise turning direction of the crankshaft would not cause the bolt ot loosen itself.

To replace the timing belt, the crankpully has to be removed. No short cut around it.

The bolt is under quite a large of torque as it nedds to pull the alternator, Ac compressor and power steering pump.
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Monday, August 31st, 2009 AT 11:17 AM

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