crank pulley flies off at 8k rpm... lead to spun bearing?
06-09-2005, 08:30 PM
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crank pulley flies off at 8k rpm... lead to spun bearing?
stupid mistake on my part not torquing down the crank pulley bolt... backed out and pulley flew off... i drove for ~2 miles at very low rpm's. Get everything back together and its good for about 20 miles, and now there is a harsh knocking coming from the block I believe, #4 cylinder. The block had about 750 total miles on it.
I have not yet dropped the oil pan to inspect for metal shavings but I am almost positive that's what has happened.
Result of pulley coming off?
Modified by dunkd at 3:45 PM 6/11/2005
I have not yet dropped the oil pan to inspect for metal shavings but I am almost positive that's what has happened.
Result of pulley coming off?
Modified by dunkd at 3:45 PM 6/11/2005
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06-09-2005, 09:20 PM
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Re: (dunkd)
with the car running start pulling plug wires to see what cylinder it is...
if the knocking stops from pulling the spark you know its a bearing
if the knocking stops from pulling the spark you know its a bearing
06-09-2005, 09:21 PM
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Re: (dunkd)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dunkd »</TD></TR><TR><TD CLASS="quote">oil pressure is normal, knocking is coming from the #4 cylinder so it cant be the oil pump gear.</TD></TR></TABLE>
**** pull the pan and see whats up in there..
**** pull the pan and see whats up in there..
06-09-2005, 09:23 PM
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Re: crank pulley flies off at 8k rpm... lead to spun bearing? (dunkd)
edit.
if the crank pulley came off, nothing internal should be affected. the only thing that the crank pulley turns is the ac/ps/alt.
so this is weird
if the crank pulley came off, nothing internal should be affected. the only thing that the crank pulley turns is the ac/ps/alt.
so this is weird
06-09-2005, 09:27 PM
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Re: crank pulley flies off at 8k rpm... lead to spun bearing? (wantboost)
If the crank pulley cam off, it doesn't necessarily mean the timing belt jumped teeth. It is still tensioned. Besides, it would have to wear through the black plastic inspection cover before it could come off (if you have it on).
06-09-2005, 10:21 PM
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Re: crank pulley flies off at 8k rpm... lead to spun bearing? (turbohonda)
@ 8k , bent valves my friend. do a leak down test , if all good then check to see if its bearings.
06-09-2005, 10:28 PM
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Re: crank pulley flies off at 8k rpm... lead to spun bearing? (amit)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by amit »</TD></TR><TR><TD CLASS="quote">@ 8k , bent valves my friend. do a leak down test , if all good then check to see if its bearings. </TD></TR></TABLE>
Yea what happened was the crank pully flew off bounced off the wheel went inside the motor and hit the valves
Yea what happened was the crank pully flew off bounced off the wheel went inside the motor and hit the valves
06-09-2005, 10:39 PM
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Re: crank pulley flies off at 8k rpm... lead to spun bearing? (D@nnY)
QUOTE=D@nnY]
Yea what happened was the crank pully flew off bounced off the wheel went inside the motor and hit the valves [/QUOTE]
whats up with the smart *** reply. can you explain yourself instead of being a dumb ****. what happend was the pulley came off, the engine overeved to the sky -resulted in bent valves. simple as that . I have had the same thing happen to me, just trying to help the man out. hopefully he spun the bearings but you never know..
Yea what happened was the crank pully flew off bounced off the wheel went inside the motor and hit the valves
[/QUOTE]whats up with the smart *** reply. can you explain yourself instead of being a dumb ****. what happend was the pulley came off, the engine overeved to the sky -resulted in bent valves. simple as that . I have had the same thing happen to me, just trying to help the man out. hopefully he spun the bearings but you never know..
06-10-2005, 09:43 AM
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i dont think it is bent valves. The motor didn't over-rev, i was datalogging on my EMS when it happened and rev's only went up to about 8500 when the pulley flew off.
When pulling the spark plug wires the knock never goes away - or get quieter...
Modified by dunkd at 2:11 PM 6/10/2005
When pulling the spark plug wires the knock never goes away - or get quieter...
Modified by dunkd at 2:11 PM 6/10/2005
06-10-2005, 10:09 AM
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Re: (dunkd)
My money is on a fried main bearing like someone said before. The vibration and lateral movement of the pulley on the snout of the crank is what did it in.
06-10-2005, 10:27 AM
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Re: (dunkd)
Well the bearings might not have actually *spun* yet.
Definately don't drive it anymore! yes pull the main caps.. I wouldn't pull them all at the same time though
If they haven't spun... get new crank&bearings and you'll be good to go.
if one of them spun or something... the block might still be ok It'd just need a little machine work. Depends on the totality of the damage. Spun main bearings are usually pretty bad though
if the mains look fine check the rod bearings.
Definately don't drive it anymore! yes pull the main caps.. I wouldn't pull them all at the same time though
If they haven't spun... get new crank&bearings and you'll be good to go.
if one of them spun or something... the block might still be ok It'd just need a little machine work. Depends on the totality of the damage. Spun main bearings are usually pretty bad though
if the mains look fine check the rod bearings.
06-10-2005, 10:45 AM
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Re: (dustin)
you 'spun' something, i think rod bearings wouldn't spin, but crank bearings could be it. The crank pulley helps kill vibrations that are produced from your engine, when it came off, i'm sure harmonic's when off the chart with the tight tolerances getting disrupted. Pull pan and start inspecting.
06-10-2005, 10:46 AM
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Re: (dustin)
I will also drop the tranny to check on the clutch and the flywheel. I think if the engine lost its balancer on one end, the other end must be wobbling alot at those rpm. Well, what do I know. 
Modified by porsche997 at 12:10 PM 6/10/2005
Modified by porsche997 at 12:10 PM 6/10/2005
06-10-2005, 10:52 AM
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Re: crank pulley flies off at 8k rpm... lead to spun bearing? (wantboost)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wantboost »</TD></TR><TR><TD CLASS="quote">edit.
if the crank pulley came off, nothing internal should be affected. the only thing that the crank pulley turns is the ac/ps/alt.
so this is weird</TD></TR></TABLE>
The crank pulley is also a balancer for the engine..
if the crank pulley came off, nothing internal should be affected. the only thing that the crank pulley turns is the ac/ps/alt.
so this is weird</TD></TR></TABLE>
The crank pulley is also a balancer for the engine..
06-10-2005, 11:02 AM
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Re: crank pulley flies off at 8k rpm... lead to spun bearing? (dustin)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dustin »</TD></TR><TR><TD CLASS="quote">Yep. this is why running those CTR pully things kills oil pumps.</TD></TR></TABLE>
Although I would never use one, I have heard that if you get the whole rotating assembly balanced together(including the ctr pulley) that everything will work fine..
Although I would never use one, I have heard that if you get the whole rotating assembly balanced together(including the ctr pulley) that everything will work fine..
