Bad ass Knock - Pirate4x4.Com : 4x4 and Off-Road Forum

MOFUGRA · 09-03-2002, 10:52 AM

ive got a knock comin from what sounds to be around the #7cyl area and i was just wonderin what would be the best way of findin out what the problem is, or just a general way to figure this kinda crap out.

cj8scrambld · 09-03-2002, 01:57 PM

You can pull the plug wire off one cyl at a time while it is running to find out what cyl is affected. That will tell you if it is a rod bearing vs. a main....I believe, anyone?

MOFUGRA · 09-03-2002, 02:18 PM

thanks, ya i just checked the main bearings and theyre all good. But i will try the spark plug thing.

hy_desert_4wheeler · 09-03-2002, 02:22 PM

If it is an automatic it could be a busted flywheel also sinceit is at the backof the engine usuall if it is a rod it is one of the front ones(usually #3 from the ones I have seen)

MOFUGRA · 09-03-2002, 02:24 PM

its an auto...so how could i check for that???

MOFUGRA · 09-03-2002, 02:39 PM

could it possibly be my tranny, cuz the noise does seem to be comin for far back in the moto maybe even behind it....And does and tranny always move???, cuz if so then it may be my tranny.

hy_desert_4wheeler · 09-03-2002, 07:30 PM

Pull the dust cover off of the bell housing then inspect the flywheel with a flahs light..Might be easier to tell if you remove the torque converter bolts.. be careful when you do though they are some times broke all the way out and will fall out when you push the torque converter back.. If it is broke Summitt sells one that is .035 thicker for about $60.00

SCOTTS_4X · 09-03-2002, 08:07 PM

the tranny is moving? independantly of the block? hmm......try tightening the bellhousing bolts and see if your problem goes away......

-Scott

hy_desert_4wheeler · 09-04-2002, 06:07 AM

Quote:

Originally posted by SCOTTS_4X
the tranny is moving? independantly of the block? hmm......try tightening the bellhousing bolts and see if your problem goes away......

-Scott

I think he is talking about the internals always rotating when the engine is running..(at least that is the way I took it)

MOFUGRA · 09-04-2002, 10:52 AM

yup thats what i was talkin about, so the internals are always rotating? And where is the flexplate?

hy_desert_4wheeler · 09-04-2002, 11:17 AM

Quote:

Originally posted by MOFUGRA
yup thats what i was talkin about, so the internals are always rotating? And where is the flexplate?

IS this question REAL??

Justin case here is the answer..

The "flexplate" AKA flywheel on a SBC is bolted to the crankshaft at the back of the block.. in the bell housing.. Maybe you should take your truck to a mechanic..

PTSchram · 09-04-2002, 01:02 PM

I once had a flywheel (flex plate) crack because the tranny bolts loosened. Damned thing knocked to beat hell. When I finally tore it apart, there were cracks between the bolt holes and the center hole. I couldn't believe it, I looked up the noise in my Chilton's and was a disbeliever until I crawled beneath it and found the misalignment that later was proven to be the cracks.

Paul

MOFUGRA · 09-04-2002, 09:20 PM

Quote:

Originally posted by hy_desert_4wheeler

IS this question REAL??

Ive never heard flexplate before always called it flywheel so

hy_desert_4wheeler · 09-05-2002, 04:52 AM

Quote:

Originally posted by MOFUGRA
Ive never heard flexplate before always called it flywheel so

YOU were the FIRST one in this post to use the term FLEXPLATE.. It had been referred to as a flywheel till that point..

09-03-2002, 10:52 AM	#1 (permalink)
MOFUGRA Registered User Join Date: Nov 2001 Member # 8417 Location: canada eh! Posts: 338	Bad ass Knock ive got a knock comin from what sounds to be around the #7cyl area and i was just wonderin what would be the best way of findin out what the problem is, or just a general way to figure this kinda crap out. __________________ Somthing strange is afoot at the circle k

09-03-2002, 02:18 PM	#3 (permalink)
MOFUGRA Registered User Join Date: Nov 2001 Member # 8417 Location: canada eh! Posts: 338	thanks, ya i just checked the main bearings and theyre all good. But i will try the spark plug thing. __________________ Somthing strange is afoot at the circle k

09-03-2002, 02:22 PM	#4 (permalink)
hy_desert_4wheeler Registered User Join Date: Jan 2001 Member # 2790 Location: Stinnett Tx USA Posts: 1,629	If it is an automatic it could be a busted flywheel also sinceit is at the backof the engine usuall if it is a rod it is one of the front ones(usually #3 from the ones I have seen) __________________ Russ hy_desert_4wheeler 46 Dodge WC15--67 M715--85 Jeep CJ10A--06 Dodge Ram2500Quad cab Cummins--94 Suburban--06 Ridgeline-

09-03-2002, 02:24 PM	#5 (permalink)
MOFUGRA Registered User Join Date: Nov 2001 Member # 8417 Location: canada eh! Posts: 338	its an auto...so how could i check for that??? __________________ Somthing strange is afoot at the circle k

09-03-2002, 02:39 PM	#6 (permalink)
MOFUGRA Registered User Join Date: Nov 2001 Member # 8417 Location: canada eh! Posts: 338	could it possibly be my tranny, cuz the noise does seem to be comin for far back in the moto maybe even behind it....And does and tranny always move???, cuz if so then it may be my tranny. __________________ Somthing strange is afoot at the circle k

09-03-2002, 01:57 PM	#2 (permalink)
cj8scrambld Rock God Join Date: Mar 2000 Member # 343 Location: Conway, MA US Posts: 1,953	You can pull the plug wire off one cyl at a time while it is running to find out what cyl is affected. That will tell you if it is a rod bearing vs. a main....I believe, anyone?

09-03-2002, 07:30 PM	#7 (permalink)
hy_desert_4wheeler Registered User Join Date: Jan 2001 Member # 2790 Location: Stinnett Tx USA Posts: 1,629	Pull the dust cover off of the bell housing then inspect the flywheel with a flahs light..Might be easier to tell if you remove the torque converter bolts.. be careful when you do though they are some times broke all the way out and will fall out when you push the torque converter back.. If it is broke Summitt sells one that is .035 thicker for about $60.00 __________________ Russ hy_desert_4wheeler 46 Dodge WC15--67 M715--85 Jeep CJ10A--06 Dodge Ram2500Quad cab Cummins--94 Suburban--06 Ridgeline-

09-03-2002, 08:07 PM	#8 (permalink)
SCOTTS_4X Registered User Join Date: Jul 2002 Member # 12780 Location: Paso Robles, ca Posts: 1,787	the tranny is moving? independantly of the block? hmm......try tightening the bellhousing bolts and see if your problem goes away...... -Scott __________________ "A fear of weapons is a sign of retarded sexual and emotional maturity." -Sigmund Frued

09-04-2002, 10:52 AM	#10 (permalink)
MOFUGRA Registered User Join Date: Nov 2001 Member # 8417 Location: canada eh! Posts: 338	yup thats what i was talkin about, so the internals are always rotating? And where is the flexplate? __________________ Somthing strange is afoot at the circle k

09-04-2002, 01:02 PM	#12 (permalink)
PTSchram Registered User Join Date: Jun 2002 Member # 12499 Location: In a Snap-On truck tryin' to make it pay Posts: 10,560	I once had a flywheel (flex plate) crack because the tranny bolts loosened. Damned thing knocked to beat hell. When I finally tore it apart, there were cracks between the bolt holes and the center hole. I couldn't believe it, I looked up the noise in my Chilton's and was a disbeliever until I crawled beneath it and found the misalignment that later was proven to be the cracks. Paul

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