Procedure for replacing exhaust cam sprocket? - The Unofficial BMW M5 Messageboard (m5board.com)

Toddzilla · 10th April 2006, 08:04

From what I've read, replacing the exhaust cam sprocket delivers a huge gain in sorely-needed torque on our 3.6L cars. I've searched and searched, but it doesn't seem that anybody has posted a procedure for doing this job.

Any tips? What other parts would I need aside from the sprocket?

unesential · 10th April 2006, 16:47

Follow procedures for timing chain and gears.

Toddzilla · 23rd April 2006, 22:06

Quote:

Originally Posted by unesential

Follow procedures for timing chain and gears.

For what motor? The bentley manual has nothing for the S38.

shuggy47 · 24th April 2006, 13:02

Chainging the sprocket is not hard just takes time.
Remove the cam cover upper chain 'guard' this will expose the sprockets.
to the front of the sprockets are two access panels. remove the one for the exhuast sprocket.At this point you will have to remove the tensioner.
once the tensioner has been removed unscrew the exhuast sprocket and position sensor and remove the sprocket and refit new one.
At no point allow the chain to fall down the gap, keep in tension.

Once the sprocket, chain and tensioner it refitted turn the engine by hand to ensure the timing is correct. at top dead centre the marks on the camshafts should line up with the brackets just behind the sprockets.
allignment pictures attached

Toddzilla · 27th April 2006, 19:21

Thanks for the input. Wouldn't I need to remove the timing chain cover to get to the tensioner?

Thanks for the reply.

EDIT- Nevermind, I see now that I just need to unscrew the tensioner from the block.

shuggy47 · 28th April 2006, 00:01

Not at all
You can gain access by removing the washer bottles.
That should give enough space to get a socket or spanner to loosen the tensioner.
From picture you can see the location.
Hope this helps

M540i LE · 28th April 2006, 02:45

I have read something about exhaust cam sprockets somewhere as well.

Maybe the tech guys on here can chime in with their thoughts on whether it is a worthwhile upgrade that could be done at the same time that I upgrade the tensioner?

Cheers

Quote:

Originally Posted by Toddzilla

From what I've read, replacing the exhaust cam sprocket delivers a huge gain in sorely-needed torque on our 3.6L cars. I've searched and searched, but it doesn't seem that anybody has posted a procedure for doing this job.

Any tips? What other parts would I need aside from the sprocket?

Toddzilla · 28th April 2006, 08:24

One more question. Should I just do the exhaust gear, or both? I haven't found a definitive answer.

Geach · 28th April 2006, 15:00

Quote:

Originally Posted by Toddzilla

One more question. Should I just do the exhaust gear, or both? I haven't found a definitive answer.

Thats what I have been trying to work out?

Anton.P. · 15th May 2006, 21:18

Quote:

Originally Posted by shuggy47

Not at all
You can gain access by removing the washer bottles.
That should give enough space to get a socket or spanner to loosen the tensioner.
From picture you can see the location.
Hope this helps

http://www.m5board.com/vbulletin/att...5&d=1146171419
In this pic i can see "tensioner"marked from you...
this detail may damage and leaked oil from here?
I see oil leak my front engine and don't understand what leaking in this location.
any idea...