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Bosch Rotor Bolt.... RH or LH thread

Tobit

Tobit

Just got it firing!
Joined
Nov 9, 2008
Messages
4
Location
Memphis, Tennessee USA
Quick question about my LeMans IV. Is the bolt in the alternator rotor a regular right hand thread or left hand? I need to get under the timing cover and don't recall if this is a "backwards" thread, it's been many years since I've had it off.

Thanks,

Tobit
 
Normal RH thread.

You will probably need the removal tool to shock the rotor off the taper. A small length of rod used to be provided in the OEM tool kit to be placed under the fitted bolt but some have had issues if the rod bends after the 'tap.'

I've never had a problem but I obviously hold my tongue just right. :p
 
A small length of rod used to be provided in the OEM tool kit to be placed under the fitted bolt but some have had issues if the rod bends after the 'tap.'

I've never had a problem but I obviously hold my tongue just right.
Click to expand...

I've had a few of them - and they can be a real bugger. Be sure to use a piece of properly hardened rod - if it bends inside the crank it can cause a lot of teeth gnashing, manly crying etc. If in doubt buy the tool. it is not a bad idea to begin by using a pair of ball peens on either side of the rotor and give them some short sharp taps to break the taper. Put some tension on the bolt and do the shock thing again. Stripping the thread is pretty catastrophic so proceed carefully.

Pete Roper had the brilliant idea of making an adapter for a grease gun and pumping grease into the rotor cavity until it pops off. I have done it and it is now my preferred method. Thank you Pete!

I lap the taper with some fine valve grinding paste when I reinstall - this is probably not required and I have never seen one come loose but it is just good practice.
 
I have a bit of hardened rod I've used to pop off the rotor before, just didn't remember if it was RH or LH. Now I know which way to try and turn the bolt. Thanks.

Next question, Since the engine is in the place and not on the bench where I can get easily hold the flywheel, what's the best way to hold it? In gear with the brake on?

Tobit.
 
You can do that, or just put a big screwdriver in the inspection hole in the bell housing to hold the flywheel.
 
Ok. Once I have the bolt out, I might give Roper's grease gun a try. Sounds much less risky than the hardened bit method which I've used.

Tobit
 
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