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Author Topic: Crank seal replacement  (Read 1441 times)

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geoffr70

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Crank seal replacement
« on: 24 November 2010, 20:00:31 »

Hello, I'v just got the stuff i ordered from the OOF shop, thanks BTW to whoever runs the shop :y

Anyway, the v6 cambelt DVD is really good. I think I'll be doing that myself the next time I need it doing. My question is, once the belt is off, what else do I need to do to replace the crank seal? Will I have to drain the oil and take the pulley of then just fit new seal?

Got the OOF car stickers aswell, it looks like the letters are all seperate which mean it will be harder to stick them to the back window and get them all lined up and level, has anyone else done this? Thanks
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Jimbob

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Re: Crank seal replacement
« Reply #1 on: 24 November 2010, 20:05:55 »

Quote
Hello, I'v just got the stuff i ordered from the OOF shop, thanks BTW to whoever runs the shop :y

Anyway, the v6 cambelt DVD is really good. I think I'll be doing that myself the next time I need it doing. My question is, once the belt is off, what else do I need to do to replace the crank seal? Will I have to drain the oil and take the pulley of then just fit new seal?

Got the OOF car stickers aswell, it looks like the letters are all seperate which mean it will be harder to stick them to the back window and get them all lined up and level, has anyone else done this? Thanks


as your screen is curved, seems the best way to me,

I just line up the 1st and last along a heated screen wire, then bring the rest into line, smooth it all down, job done.

done 5-6 now for us, and a few others at meets

Kneepad

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Re: Crank seal replacement
« Reply #2 on: 24 November 2010, 20:06:59 »

Quote
Hello, I'v just got the stuff i ordered from the OOF shop, thanks BTW to whoever runs the shop :y

Anyway, the v6 cambelt DVD is really good. I think I'll be doing that myself the next time I need it doing. My question is, once the belt is off, what else do I need to do to replace the crank seal? Will I have to drain the oil and take the pulley of then just fit new seal?

Got the OOF car stickers aswell, it looks like the letters are all seperate which mean it will be harder to stick them to the back window and get them all lined up and level, has anyone else done this? Thanks


Just don't get them in the wrong order FOO.  :)
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geoffr70

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Re: Crank seal replacement
« Reply #3 on: 24 November 2010, 20:08:30 »

Quote
Quote
Hello, I'v just got the stuff i ordered from the OOF shop, thanks BTW to whoever runs the shop :y

Anyway, the v6 cambelt DVD is really good. I think I'll be doing that myself the next time I need it doing. My question is, once the belt is off, what else do I need to do to replace the crank seal? Will I have to drain the oil and take the pulley of then just fit new seal?

Got the OOF car stickers aswell, it looks like the letters are all seperate which mean it will be harder to stick them to the back window and get them all lined up and level, has anyone else done this? Thanks


as your screen is curved, seems the best way to me,

I just line up the 1st and last along a heated screen wire, then bring the rest into line, smooth it all down, job done.

done 5-6 now for us, and a few others at meets

What a good idea! Thanks
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Matchless

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Re: Crank seal replacement
« Reply #4 on: 25 November 2010, 13:39:34 »

Quote
My question is, once the belt is off, what else do I need to do to replace the crank seal? Will I have to drain the oil and take the pulley of then just fit new seal?

The cambelt sprocket has to be removed to change the seal and because it is made from a sintered material (metal powder pressed into a mould at high temp) it need special care.

You have to bolt a long bar or piece of angle to the sprocket using the aux belt pulley bolt holes. Use this bar whilst removing the centre sprocket bolt (v.v.v.tight). Do not use an air hammer, do not lock it in gear and wallop it etc, you will shear the keyway off the sprocket.
Once the sprocket is off you can lever out the old seal. Now pull out the spacer / sleeve that the seal runs on, turn it back to front and refit it. This gives the new seal an un-worn surface to work on.
Replace the sprocket and fit a new sprocket bolt (it is a stretch bolt). Restrain the sprocket with the angle iron as before and tighten the bolt to 250Nm then a further 60 degrees. (check this...its a while since I did one)
Ideally its a job for two people.
« Last Edit: 25 November 2010, 13:40:52 by Pete »
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aaronjb

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Re: Crank seal replacement
« Reply #5 on: 25 November 2010, 13:45:12 »

Quote
Quote
My question is, once the belt is off, what else do I need to do to replace the crank seal? Will I have to drain the oil and take the pulley of then just fit new seal?

The cambelt sprocket has to be removed to change the seal and because it is made from a sintered material (metal powder pressed into a mould at high temp) it need special care.

You have to bolt a long bar or piece of angle to the sprocket using the aux belt pulley bolt holes. Use this bar whilst removing the centre sprocket bolt (v.v.v.tight). Do not use an air hammer, do not lock it in gear and wallop it etc, you will shear the keyway off the sprocket.
Once the sprocket is off you can lever out the old seal. Now pull out the spacer / sleeve that the seal runs on, turn it back to front and refit it. This gives the new seal an un-worn surface to work on.
Replace the sprocket and fit a new sprocket bolt (it is a stretch bolt). Restrain the sprocket with the angle iron as before and tighten the bolt to 250Nm then a further 60 degrees. (check this...its a while since I did one)
Ideally its a job for two people.

I bet it is! I had to lay across the car and use my legs against the garage wall when I did the Nissan, and that was just 180lb/ft with no further angle tightening!
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geoffr70

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Re: Crank seal replacement
« Reply #6 on: 25 November 2010, 14:04:07 »

Quote
Quote
My question is, once the belt is off, what else do I need to do to replace the crank seal? Will I have to drain the oil and take the pulley of then just fit new seal?

The cambelt sprocket has to be removed to change the seal and because it is made from a sintered material (metal powder pressed into a mould at high temp) it need special care.

You have to bolt a long bar or piece of angle to the sprocket using the aux belt pulley bolt holes. Use this bar whilst removing the centre sprocket bolt (v.v.v.tight). Do not use an air hammer, do not lock it in gear and wallop it etc, you will shear the keyway off the sprocket.
Once the sprocket is off you can lever out the old seal. Now pull out the spacer / sleeve that the seal runs on, turn it back to front and refit it. This gives the new seal an un-worn surface to work on.
Replace the sprocket and fit a new sprocket bolt (it is a stretch bolt). Restrain the sprocket with the angle iron as before and tighten the bolt to 250Nm then a further 60 degrees. (check this...its a while since I did one)
Ideally its a job for two people.

Thanks for that matchless, very helpful! Due to the bolt on the sprocket being on very tight, will the aux belt pulley be strong enough to resist the force applied to it when you put the rod on and turn against it?

Also I take it it must be very important to put the sprocket back on in exactly the same orientation it came off? Is the flange and the toothed/ribbed bit all one bit?

Thanks
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Matchless

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Re: Crank seal replacement
« Reply #7 on: 02 December 2010, 12:20:39 »

I didnt explain very well,

The crankshaft sprocket is keyed to the crank and is held in place by one central bolt.
The aux belt pulley bolts to the crankshaft sprocket with 6 M6 screws.

You remove the aux belt pulley then bolt your angle iron etc to the crankshaft sprocket using as many of the 6 holes as you can. I took a paper rubbing of the bolt hole pattern and use this to drill all 6 holes plus a large central hole in a piece of angle. (the 6 holes are not symetrical)

The crankshaft sprocket will only fit back on in one position so no worries there.

I will have to look up the bolt torque setting..I dont think 250Nm is right. You do need a new bolt....you can feel the bolt stretch as you put the angle tightening on.

Found a pic of the sprocket, bolt, angle, breaker bar and essential scaffold tube:
« Last Edit: 02 December 2010, 12:30:49 by Pete »
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henryd

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Re: Crank seal replacement
« Reply #8 on: 02 December 2010, 12:27:55 »

just checked and it is 250 nm+45degrees +15 degrees :y
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Matchless

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Re: Crank seal replacement
« Reply #9 on: 02 December 2010, 12:32:38 »

Thanks Henry :y
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feeutfo

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Re: Crank seal replacement
« Reply #10 on: 02 December 2010, 17:41:32 »

Will a baring puller do the job? Loosen the bolt then clip the puller on the back of the sprocket, then tighten the puller onto the lose bolt?
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Matchless

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Re: Crank seal replacement
« Reply #11 on: 03 December 2010, 13:13:54 »

Once the centre bolt is loose the sprocket is a sliding fit on the crank....no need for pullers.
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