Help! Crankshaft chain gear/sprockets at front...how do I get this off?

stashtrey · 04-07-2016, 09:42 PM

So I've had a spare engine in the garage for several months after cracking a piston and replacing it with a used engine.

I've pulled the head, pan, oil pump, main bolts and bed plate, rods/pistons etc. I got the crank out but couldn't figure out how to get the sprockets off the front of the shaft. I pulled it because I had someone interested in buying it but that is on hold. I am going to pay everything out. This is my first time pulling apart an engine like this.

I put the crank back into the engine after taking some pics. Just need to figure out how to remove that end piece to get the sprockets/gears and metal chain plate off.

Pic attached for visual. Thinking maybe a gear puller??

steamboat · 04-07-2016, 10:16 PM

a huge breaker bar and sweat. Think 8'.

stashtrey · 04-08-2016, 02:37 AM

Quote:

Originally Posted by steamboat

a huge breaker bar and sweat. Think 8'.

Should I have removed it before pulling the entire crank out? Maybe a machine shop that works with engine parts could pull it apart for me??

vtl · 04-08-2016, 03:02 AM

BMW ISTA says the torque spec for that bolt is 100Nm + 360 degrees!! Never seen a jointing angle that large before!

There is a special tool that bolts onto the hub to keep it from rotating while you apply torque to the middle nut. I would say a 21mm socket (i think that was the size) and big impact gun could do the job.

sA x sKy · 04-08-2016, 11:03 AM

You need to take out the crank hub to take out the piece.

steamboat · 04-08-2016, 03:41 PM

Yea, it's generally done in the engine. I bet a machine shop could pull it for you though.

stashtrey · 04-08-2016, 04:26 PM

Thanks guys!

Anyone looking for a crank? Complete head? Set of rods? Bare block? Cams?

04-07-2016, 09:42 PM	#1
stashtrey Lieutenant Colonel 296 Rep 1,834 Posts Drives: 08 E90 335xi TiAg Join Date: Dec 2012 Location: Sacramento, CA iTrader: (8) Garage List 2008 E90 335xi Sedan [0.00]	Help! Crankshaft chain gear/sprockets at front...how do I get this off? So I've had a spare engine in the garage for several months after cracking a piston and replacing it with a used engine. I've pulled the head, pan, oil pump, main bolts and bed plate, rods/pistons etc. I got the crank out but couldn't figure out how to get the sprockets off the front of the shaft. I pulled it because I had someone interested in buying it but that is on hold. I am going to pay everything out. This is my first time pulling apart an engine like this. I put the crank back into the engine after taking some pics. Just need to figure out how to remove that end piece to get the sprockets/gears and metal chain plate off. Pic attached for visual. Thinking maybe a gear puller?? Attached Images __________________ E90 2008 335xi - TiAg - AMS FMIC - BMW PE - BMS OCC - ER CP - KW V3 - Vorshlag Camber Plates - AG M359 18" PSS - Alpina Flash - RB PCV Valvle - AFE Intake - Walbro LPFP
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04-07-2016, 10:16 PM	#2
steamboat Private 16 Rep 87 Posts Drives: E90 335i, e39 540it Join Date: Dec 2014 Location: South Florida iTrader: (5)	a huge breaker bar and sweat. Think 8'.
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04-08-2016, 03:02 AM	#4
vtl Brigadier General 1514 Rep 3,149 Posts Drives: 2008 BMW 135i MT Join Date: Apr 2015 Location: Melbourne, Australia iTrader: (0)	BMW ISTA says the torque spec for that bolt is 100Nm + 360 degrees!! Never seen a jointing angle that large before! There is a special tool that bolts onto the hub to keep it from rotating while you apply torque to the middle nut. I would say a 21mm socket (i think that was the size) and big impact gun could do the job. __________________ Build Thread
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04-08-2016, 11:03 AM	#5
sA x sKy Sameet 756 Rep 2,541 Posts Drives: AY/B M4 '15 Join Date: Apr 2010 Location: Long Island, New York iTrader: (3) Garage List 2015 BMW M4 [0.00]	You need to take out the crank hub to take out the piece.
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04-08-2016, 03:41 PM	#6
steamboat Private 16 Rep 87 Posts Drives: E90 335i, e39 540it Join Date: Dec 2014 Location: South Florida iTrader: (5)	Yea, it's generally done in the engine. I bet a machine shop could pull it for you though.
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04-08-2016, 04:26 PM	#7
stashtrey Lieutenant Colonel 296 Rep 1,834 Posts Drives: 08 E90 335xi TiAg Join Date: Dec 2012 Location: Sacramento, CA iTrader: (8) Garage List 2008 E90 335xi Sedan [0.00]	Thanks guys! Anyone looking for a crank? Complete head? Set of rods? Bare block? Cams?
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