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Crank Pully Question


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9 replies to this topic

#1 markjw

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Posted 09 September 2009 - 09:42 PM

I'm trying to put back together a ea82 engine that someone didn't finish a
oil pump/timing belt job on.

I had to go the the wrecking yard today for a crank pully (original one was lost). Found one,spun the crank bolt off and was on my way.

So,I go to install it on the end of the crank and it seems there should be a key way. Should there be? Or,is it just held on by the torque of the crank bolt?

I just did a bunch of front engine work on a ea82 a month ago. I can't remember this part.

Thanks. (I searched,no answer)

#2 Txakura

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Posted 09 September 2009 - 09:50 PM

hmmm.... well, mine didn't have a key, it was just bolted (1990 donor, 1987 recipient)

are you saying the crank had a place for it but the pulley you got didn't?

#3 markjw

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Posted 09 September 2009 - 10:01 PM

The pully has a hole for what looks like a pin. I don't know. Something doesn't add up.

Looks like I may have left behind a pin that sticks out of the belt sproket.

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#4 grossgary

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Posted 09 September 2009 - 10:14 PM

It's been awhile since I did an EA82.

On the ER27 (XT6 based off the EA82 - same pistons, valves, injectors, rings, bearings, etc), it has a pin in the crank pulley. The crank pulley has a hole that the pin is pressed into. This then slides into one of the holes in the timing sprockets on the crank shaft behind the pulley.

Either way, it's actually not necessary, but maintains proper alignment for timing off the crank pulley. Without it you can still time it off the flexplate/flywheel though through the bellhousing access hole.

I've installed tons of the XT6 ones without the pin in place, make sure they are TIGHT and they won't come off. I use a socket and 3 foot extension pipe and give it some good torque. It's not aluminum so no worries on stripping (well, i'm sure it's possible!).

#5 markjw

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Posted 09 September 2009 - 10:16 PM

Alright..Thanks. I'm going to just bolt it on and give it some hella torque.

I pulled the crank sprocket off the engine at the yard. I looked it over and put it back. I don't remember seeing a pin or a key way.

#6 ruparts

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Posted 10 September 2009 - 08:55 AM

Hi,
there is a keyway, but just for the two cam drive gears, there is a short roll pin in some of the outside cam drive gears and not in others. if your pulley has a hole like the one pictured you can use the roll pin, if the pulley has no hole then no roll pin. but if you get it tight with the bolt it does not matter. the timing is set from the flywheel so the pulley can be rotated to any position . i'm not sure why but i noticed that the engines that have the two piece crank pulley with the rubber imbedded in it used the pin and those with the 1 piece pulley had no pin, and i am not sure why they had two different pulleys anyway. seems the turbo and the mpfi had the two piece and carb and spfi had the 1piece pulley.
good luck with the repair

I'm trying to put back together a ea82 engine that someone didn't finish a
oil pump/timing belt job on.

I had to go the the wrecking yard today for a crank pully (original one was lost). Found one,spun the crank bolt off and was on my way.

So,I go to install it on the end of the crank and it seems there should be a key way. Should there be? Or,is it just held on by the torque of the crank bolt?

I just did a bunch of front engine work on a ea82 a month ago. I can't remember this part.

Thanks. (I searched,no answer)



#7 Txakura

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Posted 10 September 2009 - 09:16 AM

It almost looks like you could use a short roll pin from the hardware store (<$1)

it almost made me think it was a balancing hole in your pic, but I guess it does perfectly line up in the other piece

mine didn't have that feature, but on the other hand the pulley center bolt torque is pretty high - it hasn't done anything weird

#8 zilejanis

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Posted 11 September 2009 - 10:12 AM

It is pin in older ea-82 engines. After 1989 I did `nt see this pins.

#9 GeneralDisorder

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Posted 11 September 2009 - 10:16 AM

You can install the pin if you wish - doesn't make much difference. I've made new pins before from old drill bit shanks. All it drives is the accesories and as long as it's tight there's generally not an issue. Use some blue loctite on the bolt and properly torque it and you will be fine.

GD

#10 Gloyale

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Posted 12 September 2009 - 02:52 PM

All early models and most? Turbos had a pin in there. Later ones did not.

If you like, it is easy to install a pin in it. But it isn't needed if it gets bolted tight.




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