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Author Topic: Urgent Crank Seal Question (Mark or Matchless?)  (Read 4580 times)

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Matchless

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Re: Urgent Crank Seal Question (Mark or Matchless?
« Reply #45 on: 26 June 2007, 09:21:34 »

James, the bit of metal was the keyway from the timing sprocket, you need a new sprocket. Is the slot in the crank OK?

The sprocket bolt is V.V.V.tight, something like 270nm + 45 deg. When you locked the crank instead of bolting a bar to the sprocket you transferred all that torque to the keyway and it isnt designed for that sort of load.

I hope your crank is OK, if so get another sprocket (McB may still have a spare block in his garden....) fit the sprocket and loosely do up the bolt to retain it. Now refit the belt etc and then bolt a piece of angle etc to the sprocket before torqueing up the bolt fully.  The reason for this method is that you do not want the crank to rotate AT ALL relative to the cams.

BTW, when you prise out the old seal you will find a 'spacer' on the crank, pull this off and check for a groove worn in it by the seal. You can simply reverse this spacer so the seal runs on a fresh bit, if you dont the new seal will leak.

I made up this restraining bar for the crank sprocket :


You can see the hole pattern for the sprocket on the end, I made a rubbing of the aux pulley to transfer the pattern to the ally angle.

Also a pic of the grooved spacer:


If you can get a sprocket locally then fine, otherwise try McB, if he still has the engine I can remove the sprocket from it and post.
« Last Edit: 26 June 2007, 10:14:52 by Pete »
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hotel21

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Re: Urgent Crank Seal Question (Mark or Matchless?
« Reply #46 on: 26 June 2007, 09:32:25 »

Mark - no sign of a seperate listing for a key that can be found on EPC or other 'paperwork' that a friend has access too.....   ;)

After thinking on whats happened, I would be inclined towards there being a machined lug on the sprocket with a corresponding groove in the crank taper, rather than a permanent protruding keyway on the crank taper with a groove on the sprocket due to manufacturing/machining limitations.

Plus, as we now have found out, it will be easier to replace the sprocket complete rather than the crankshaft if the locating key fails........
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Matchless

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Re: Urgent Crank Seal Question (Mark or Matchless?
« Reply #47 on: 26 June 2007, 09:40:21 »

The key is an integral part of the sprocket.
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Marks DTM Calib

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Re: Urgent Crank Seal Question (Mark or Matchless?
« Reply #48 on: 26 June 2007, 09:59:12 »

Question answered then, so, is the crank slot damaged at all...
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JamesV6CDX

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Re: Urgent Crank Seal Question (Mark or Matchless?
« Reply #49 on: 26 June 2007, 12:39:25 »

Quote
Question answered then, so, is the crank slot damaged at all...

Nope - there is no damage at all, to the crank slot that I can see. Hopefully, I have had a lucky escape.

By fabricate a tool to lock the crank, I just assumed you meant via the flywheel. (As I've always done on Rovers -Doh!! ) Nevermind, I'll know for next time.. good learning experience!

Mr McB doesn't have a pulley, I've emailed Henry and Rupert..
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sassanach

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Re: Urgent Crank Seal Question (Mark or Matchless?
« Reply #50 on: 26 June 2007, 14:35:44 »

ive got two! :)
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cdx25

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Re: Urgent Crank Seal Question (Mark or Matchless?
« Reply #51 on: 26 June 2007, 16:11:46 »

Quote
ive got two! :)

Given the strength of his arm, make sure you sell him them both, he may need a spare  ;D
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JamesV6CDX

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Re: Urgent Crank Seal Question (Mark or Matchless?
« Reply #52 on: 26 June 2007, 18:44:09 »

Quote
ive got two! :)

Have you really got 2 toothed crank pulleys? I'm DESPERATE... can you help me mate? Are they intact with the keys intact?

Can you let me know a price inc postage? I'll be on again tonight...

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