Crankshaft bolt removal after NST pulley failed

Rangerz · 06-24-2015, 11:35 PM

Hopefully someone has a suggestion here. Long story short my NST crank pulley disinigrated last Friday as I was returning from the track and I'm now having a hell of a time getting the bolt and what is left of the pulley removed.

What I have tried so far:

1. isolate drive train with 3/8 extention run through the driveline yoke with that run into some 3/4 in pipe braced on the floor then a 5 ft breaker bar and a friend - result 2 broken 3/8 extentions.

1.5 tried bumping the starter with breaker bar braced on ground- no luck

2. Using a chain wrench wrapped around the remnants of the NST pulley and braced against the sway bar and the 5 ft breaker bar- result side of the chain started to dig into the timing chain cover so stopped.

3. Removed radiator so I could get a air gun on it.
1st attempt with crappy craftsman rettle gun no luck.
2nd attempt brother borrowed from work a Ingersoll Rand ported 800 ft lbs at 400 psi gun- result I can only throw 140 psi at it with my compressor but no luck. The gun slowly turns the crank.

Also with each attempt we have had PB blaster, Heat, and cold.

Does anyone have any other ideas??? And where would someone find a flywheel lock out device?

Infiniti370z · 06-25-2015, 01:38 AM

Have you tried putting the car in gear, setting the parking brake and holding the brakes (second person) to hold the crankshaft?

Rangerz · 06-25-2015, 01:52 AM

Quote:

Originally Posted by Infiniti370z

Have you tried putting the car in gear, setting the parking brake and holding the brakes (second person) to hold the crankshaft?

Yep sorry yoke blocked and in 5th gear, emergency break applied as well.

gomer_110 · 06-25-2015, 07:52 AM

Quote:

Originally Posted by Rangerz

...2nd attempt brother borrowed from work a Ingersoll Rand ported 800 ft lbs at 400 psi gun- result I can only throw 140 psi at it with my compressor but no luck. The gun slowly turns the crank.

Any chance of getting a nitrogen bottle from a welding supply company to get the higher pressure you need?

Rangerz · 06-25-2015, 08:23 AM

Quote:

Originally Posted by gomer_110

Any chance of getting a nitrogen bottle from a welding supply company to get the higher pressure you need?

I hadn't thought of a nitrogen bottle. I was thinking of renting one of the diesel powered job site compressors and give that a try. I also ordered some are Kroil which is supposed to be great penitrating oil.

synolimit · 06-25-2015, 08:28 AM

Is the motor ok?

SouthArk370Z · 06-25-2015, 10:34 AM

You sound like you know how to work on a car but I gotta ask: are you sure you are turning the bolt the right way? Every crank bolt I've worked on (granted, not a lot) would come loose using the block-the-wrench-and-hit-the-starter method, so it's a long shot.

FSM will have how Nissan does it.

Trips · 06-25-2015, 10:47 AM

Yup sounds like she stuck on their real good.

A heavy duty impact gun like the ones they use for tire shops with a matching compressor will break it loose.

I would have tried breaking it loose with either a big sized rubber mallet or a small heavy sledge hammer a poor mans impact gun.

Mandingo · 06-25-2015, 11:01 AM

The special tool that Nissan uses to lock the flywheel looks the be about $250. Might be an option though if you get desperate enough.

I had to use a floor jack on the end of a braker bar to get my crank bolt off. Even then it started to lift the front of the car in the air before it finally gave

Infiniti370z · 06-25-2015, 11:32 AM

Yep, that bad boy is on there tighter than a nuns box.

Rangerz · 06-25-2015, 01:04 PM

Thanks for the suggestions. Im going to borrow a torque multipler from work and give it a try tonight. 18 ft lbs tq = 200 throught the multipler. It can go to 200 ft input = 2400 lbs out. If that doesnt do it might be time for the lock out.

Engine is fine Scott...for now

Spooler · 06-25-2015, 01:21 PM

Add a little Air tool oil in the impact gun at the air chuck. It will give it a little more power. I use a MAC 1/2" impact gun. It's better than the Snap-on jobbers.

Rangerz · 06-26-2015, 12:26 AM

Got it finally. Had all the high speed gadgets and it came back to, 5 ft of breaker bar and a chain wrench wrapped in heater hose around the driveline yoke to isolate the give in the drive train.

The remainder of the pulley was stuck on good as well but, came out with a small puller. I would warn everyone again on the light weight pulleys. Not worth it and can lead to much bigger problems. Luckily mine broke at relatively low rpms near the house and the way it broke it didn't damage the timing cover and was still round enough to not have a huge unbalancing effect on the crank.

Trips · 06-26-2015, 12:47 AM

Glad to hear the NEWS!

Now you can get back on the road

Spooler · 06-26-2015, 01:01 AM

WOW, you had to work hard for that one. Did you do a dance around the yard when it finally popped loose?

06-24-2015, 11:35 PM	#1 (permalink)
Rangerz Enthusiast Member Join Date: Jun 2013 Location: Northern Utah Age: 59 Posts: 476 Drives: 2012 370 Nismo Rep Power: 12	Crankshaft bolt removal after NST pulley failed Hopefully someone has a suggestion here. Long story short my NST crank pulley disinigrated last Friday as I was returning from the track and I'm now having a hell of a time getting the bolt and what is left of the pulley removed. What I have tried so far: 1. isolate drive train with 3/8 extention run through the driveline yoke with that run into some 3/4 in pipe braced on the floor then a 5 ft breaker bar and a friend - result 2 broken 3/8 extentions. 1.5 tried bumping the starter with breaker bar braced on ground- no luck 2. Using a chain wrench wrapped around the remnants of the NST pulley and braced against the sway bar and the 5 ft breaker bar- result side of the chain started to dig into the timing chain cover so stopped. 3. Removed radiator so I could get a air gun on it. 1st attempt with crappy craftsman rettle gun no luck. 2nd attempt brother borrowed from work a Ingersoll Rand ported 800 ft lbs at 400 psi gun- result I can only throw 140 psi at it with my compressor but no luck. The gun slowly turns the crank. Also with each attempt we have had PB blaster, Heat, and cold. Does anyone have any other ideas??? And where would someone find a flywheel lock out device? __________________ Stillen Gen III/ NST/ Fast Intentions Non-Res HFC & 12" Resonated CF TDX/ Setreb series 9 OC/ SPL upper control arms/ Whiteline front & rear swaybars/ Uprev tuned by Seb@specialtyZ/ 319HP 262TQ/ Z1 PS Cooler/ Z1 SS Premium break lines/ CJM Road Race pump/Carbotech F:XP10 R:XP8 Nismo OC DIY Last edited by Rangerz; 06-25-2015 at 01:22 AM.

06-25-2015, 01:38 AM	#2 (permalink)
Infiniti370z Track Member Join Date: Sep 2010 Location: Coconut Creek, FL Posts: 604 Drives: Lamborghinis all day Rep Power: 16	Have you tried putting the car in gear, setting the parking brake and holding the brakes (second person) to hold the crankshaft? Rangerz likes this. __________________ //RAYS ENGINEERING//Z1 MOTORSPORTS//NISMO//RADI-CAL BBK//SPARCO//3M//ESCORT//BLENDMOUNT//BOSE//AAM//GTR//THE RETROFIT SOURCE//MILLENNIA 2014 Nismo BLK//2004 Sentra SE-R Spec-v//2013 Prius 4//Sold 2010 370z GM base 6MT

06-25-2015, 08:28 AM	#6 (permalink)
synolimit A True Z Fanatic Join Date: May 2013 Location: Columbus, OH Posts: 5,051 Drives: 2013 Silver 370z Rep Power: 3389	Is the motor ok? DOOMMONKEY777 likes this. __________________ 13 370z-

06-25-2015, 10:34 AM	#7 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	You sound like you know how to work on a car but I gotta ask: are you sure you are turning the bolt the right way? Every crank bolt I've worked on (granted, not a lot) would come loose using the block-the-wrench-and-hit-the-starter method, so it's a long shot. FSM will have how Nissan does it. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma Last edited by SouthArk370Z; 06-25-2015 at 11:35 AM.

06-25-2015, 10:47 AM	#8 (permalink)
Trips Administrator Join Date: May 2009 Location: Disneyland, Ca Posts: 8,732 Drives: 🔰 Rep Power: 10	Yup sounds like she stuck on their real good. A heavy duty impact gun like the ones they use for tire shops with a matching compressor will break it loose. I would have tried breaking it loose with either a big sized rubber mallet or a small heavy sledge hammer a poor mans impact gun. Infiniti370z and Rangerz like this. __________________ Last edited by Trips; 06-25-2015 at 10:58 AM.

06-25-2015, 11:01 AM	#9 (permalink)
Mandingo Track Member Join Date: Nov 2010 Location: Dallas Posts: 625 Drives: '10 370z 6spd Rep Power: 3371	The special tool that Nissan uses to lock the flywheel looks the be about $250. Might be an option though if you get desperate enough. I had to use a floor jack on the end of a braker bar to get my crank bolt off. Even then it started to lift the front of the car in the air before it finally gave Rangerz likes this. __________________ some mods Last edited by Mandingo; 06-25-2015 at 11:03 AM.

06-25-2015, 11:32 AM	#10 (permalink)
Infiniti370z Track Member Join Date: Sep 2010 Location: Coconut Creek, FL Posts: 604 Drives: Lamborghinis all day Rep Power: 16	Yep, that bad boy is on there tighter than a nuns box. gbrettin, Masterbeatty and Rangerz like this. __________________ //RAYS ENGINEERING//Z1 MOTORSPORTS//NISMO//RADI-CAL BBK//SPARCO//3M//ESCORT//BLENDMOUNT//BOSE//AAM//GTR//THE RETROFIT SOURCE//MILLENNIA 2014 Nismo BLK//2004 Sentra SE-R Spec-v//2013 Prius 4//Sold 2010 370z GM base 6MT

06-25-2015, 01:04 PM	#11 (permalink)
Rangerz Enthusiast Member Join Date: Jun 2013 Location: Northern Utah Age: 59 Posts: 476 Drives: 2012 370 Nismo Rep Power: 12	Thanks for the suggestions. Im going to borrow a torque multipler from work and give it a try tonight. 18 ft lbs tq = 200 throught the multipler. It can go to 200 ft input = 2400 lbs out. If that doesnt do it might be time for the lock out. Engine is fine Scott...for now __________________ Stillen Gen III/ NST/ Fast Intentions Non-Res HFC & 12" Resonated CF TDX/ Setreb series 9 OC/ SPL upper control arms/ Whiteline front & rear swaybars/ Uprev tuned by Seb@specialtyZ/ 319HP 262TQ/ Z1 PS Cooler/ Z1 SS Premium break lines/ CJM Road Race pump/Carbotech F:XP10 R:XP8 Nismo OC DIY

06-25-2015, 01:21 PM	#12 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,830 Drives: 2013 Nismo 370z Rep Power: 2684392	Add a little Air tool oil in the impact gun at the air chuck. It will give it a little more power. I use a MAC 1/2" impact gun. It's better than the Snap-on jobbers. Last edited by Spooler; 06-25-2015 at 08:09 PM.

06-26-2015, 12:26 AM	#13 (permalink)
Rangerz Enthusiast Member Join Date: Jun 2013 Location: Northern Utah Age: 59 Posts: 476 Drives: 2012 370 Nismo Rep Power: 12	Got it finally. Had all the high speed gadgets and it came back to, 5 ft of breaker bar and a chain wrench wrapped in heater hose around the driveline yoke to isolate the give in the drive train. The remainder of the pulley was stuck on good as well but, came out with a small puller. I would warn everyone again on the light weight pulleys. Not worth it and can lead to much bigger problems. Luckily mine broke at relatively low rpms near the house and the way it broke it didn't damage the timing cover and was still round enough to not have a huge unbalancing effect on the crank. 2011 Nismo#91, YzGyz and Memphis370Z like this. __________________ Stillen Gen III/ NST/ Fast Intentions Non-Res HFC & 12" Resonated CF TDX/ Setreb series 9 OC/ SPL upper control arms/ Whiteline front & rear swaybars/ Uprev tuned by Seb@specialtyZ/ 319HP 262TQ/ Z1 PS Cooler/ Z1 SS Premium break lines/ CJM Road Race pump/Carbotech F:XP10 R:XP8 Nismo OC DIY

06-26-2015, 12:47 AM	#14 (permalink)
Trips Administrator Join Date: May 2009 Location: Disneyland, Ca Posts: 8,732 Drives: 🔰 Rep Power: 10	Glad to hear the NEWS! Now you can get back on the road Rangerz likes this. __________________

06-26-2015, 01:01 AM	#15 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,830 Drives: 2013 Nismo 370z Rep Power: 2684392	WOW, you had to work hard for that one. Did you do a dance around the yard when it finally popped loose? Rangerz likes this.

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