loose flywheel - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

slamed_s13 · 05-08-2009, 11:54 PM

I had all my flywheel bolts loose when my friend and I took out the motor today because it was knocking. Plus, it had a hard time starting. I check the connecting rods but they're all fine.

Questions:

Does it sound like a spun bearing? Like the bottom end is gone?
Does it have anything to do with starting the car?

We had a hard time taking the flywheel off the main, we had to tap that thing off with a hammer. What should I do about this? Get the main hole on the flywheel machined to make it a little bigger??

*fliprayzin240sx* · 05-09-2009, 08:00 PM

Huh? What the hell are you trying to do? If youre flywheel bolts are loose and they happen to come up, itll fuck up your clutch and jam it (youll be stuck in gear or out of gear).

deuceforty · 05-09-2009, 08:04 PM

Quote:

Originally Posted by fliprayzin240sx

Huh? What the hell are you trying to do? If youre flywheel bolts are loose and they happen to come up, itll fuck up your clutch and jam it (youll be stuck in gear or out of gear).

your flywheel is spinning at high rpms, if ALL the bolts are loose than its not going to be centered on the crank.. rotating at high rpms will warp either the flywheel or the crank.

this is why you loctite and torque your flywheel properly..

jakerps13 · 05-09-2009, 08:49 PM

If it's an aluminum flywheel, throw it in the oven before you install it. Some of the brands, Fidanza iirc, has too tight of an interference tolerance and needs to be heated before installation. Double check torque after cool down.

If it's a stock flywheel, you need to learn how to torque and use locktite. The flywheel should be a tight fit on the crankshaft. You might want to sand the inside of the flywheel if it's corroded, if it's clean I wouldn't touch it.

Inspect your crank and flywheel for damage. A loose flywheel will sound like the lower end is falling apart, however it's not rythmic, it's random for the most part.

tylerbretts13 · 05-09-2009, 09:23 PM

if your flywheel bolts were loose that was prob the knocking like sound you were hearing. It kinda sounds similar to knocking. My buddie had the same prob.

ImPLiCiTS14 · 01-20-2010, 08:39 PM

i had the same prob the flywheel with loose bolts gave a knocking kinda sound i thought it was engine at first too. But my Prob now is I retightened everything and i notice the flywheel is wobbling a little and the car vibrates a bit since the incident any ideas?

moses · 01-23-2010, 09:36 PM

Good to know I wasn't the only one. I had a loose one a while back and it was loud. It was obvious where the bolts were hitting too. The mating surface of the crank and flywheel were eatin up pretty bad but I still drove around like that. I replaced both since I did my rebuild because my mechanic said it could throw off the balance.

05-08-2009, 11:54 PM	#1
slamed_s13 Leaky Injector Join Date: Oct 2008 Location: San Antonio TX Age: 36 Posts: 140 Trader Rating: (4) Feedback Score: 4 reviews	loose flywheel I had all my flywheel bolts loose when my friend and I took out the motor today because it was knocking. Plus, it had a hard time starting. I check the connecting rods but they're all fine. Questions: Does it sound like a spun bearing? Like the bottom end is gone? Does it have anything to do with starting the car? We had a hard time taking the flywheel off the main, we had to tap that thing off with a hammer. What should I do about this? Get the main hole on the flywheel machined to make it a little bigger??

05-09-2009, 08:00 PM	#2
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Huh? What the hell are you trying to do? If youre flywheel bolts are loose and they happen to come up, itll fuck up your clutch and jam it (youll be stuck in gear or out of gear). __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

05-09-2009, 08:49 PM	#4
jakerps13 Zilvia Member Join Date: Nov 2003 Location: Appleton, WI Age: 40 Posts: 171 Trader Rating: (0) Feedback Score: 0 reviews	If it's an aluminum flywheel, throw it in the oven before you install it. Some of the brands, Fidanza iirc, has too tight of an interference tolerance and needs to be heated before installation. Double check torque after cool down. If it's a stock flywheel, you need to learn how to torque and use locktite. The flywheel should be a tight fit on the crankshaft. You might want to sand the inside of the flywheel if it's corroded, if it's clean I wouldn't touch it. Inspect your crank and flywheel for damage. A loose flywheel will sound like the lower end is falling apart, however it's not rythmic, it's random for the most part. __________________ Lower than a pornstar's morals.

01-23-2010, 09:36 PM	#7
moses Zilvia Junkie Join Date: Mar 2005 Location: Jacksonville, ar Age: 38 Posts: 555 Trader Rating: (2) Rides Gallery: moses Feedback Score: 2 reviews	Good to know I wasn't the only one. I had a loose one a while back and it was loud. It was obvious where the bolts were hitting too. The mating surface of the crank and flywheel were eatin up pretty bad but I still drove around like that. I replaced both since I did my rebuild because my mechanic said it could throw off the balance. __________________ Thats what I said

05-09-2009, 09:23 PM	#5
tylerbretts13 Join Date: Jul 2008 Location: Greenville SC Age: 36 Posts: 37 Trader Rating: (0) Feedback Score: 0 reviews	if your flywheel bolts were loose that was prob the knocking like sound you were hearing. It kinda sounds similar to knocking. My buddie had the same prob.

01-20-2010, 08:39 PM	#6
ImPLiCiTS14 Zilvia Member Join Date: Nov 2003 Location: Going thru a honda near u Posts: 187 Trader Rating: (1) Feedback Score: 1 reviews	i had the same prob the flywheel with loose bolts gave a knocking kinda sound i thought it was engine at first too. But my Prob now is I retightened everything and i notice the flywheel is wobbling a little and the car vibrates a bit since the incident any ideas?